Projection device

Abstract

The utility model discloses a projection device. The projection device comprises a projection module, wherein the projection module comprises a shell, a lamp body, a light condensing part, a projection screen and a lens group; the light gathering part is arranged around the lamp body part and comprises a lower opening and an upper opening which are communicated with each other and at least one reflecting plate which forms the upper opening and the lower opening, the inner surface of the reflecting plate is a reflecting surface, and the reflecting surface is composed of a reflecting film or a reflecting sheet; or the light gathering piece comprises a positioning shell and a reflecting cover installed on the positioning shell, the reflecting cover comprises a reflecting plate which forms an upper opening and a lower opening, and the inner surface of the reflecting plate forms a reflecting surface; the projection screen is installed on the light gathering piece, the lens set is located above the projection screen, the light rays, diffused outwards, of the lamp body are gathered to the middle through the light reflecting film or the light reflecting plate or the light reflecting cover, and after the distribution path of part of the light rays is changed, the light rays penetrate through the projection screen and the lens set to be projected outwards. The light condensation structure with the light reflection effect is additionally arranged on the lamp body, light emitted by the light source to the periphery is gathered to the middle again, and the light utilization rate is increased.

Description

[Technical Field]

[0001] This utility model relates to the technical field of projection devices, and in particular to a lyrics projection device. [Background Technology]

[0002] An existing projection device includes an imaging lens, a reflective glass, an imaging Fresnel lens, a liquid crystal display unit, a heat-insulating and brightness-enhancing glass unit, a backlight collimating Fresnel lens, a diffuse reflector, an LED light source module, a heat dissipation module, a mounting plate, and a housing. Light emitted from the LED light source module passes sequentially through the diffuse reflector, the backlight collimating Fresnel lens, the heat-insulating and brightness-enhancing glass unit, the liquid crystal display unit, the reflective glass, and the imaging lens. 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 angled to the imaging Fresnel lens and also contains the imaging lens. The liquid crystal display unit, the heat-insulating and brightness-enhancing glass unit, and the backlight Fresnel lens are stacked sequentially on the bottom of the mounting plate. The backlight collimating Fresnel lens is screwed to the diffuse reflector. The LED light source module is installed at the bottom opening of the diffuse reflector. The heat dissipation module below the LED light source module is connected to the mounting plate by screws.

[0003] Because the light loss rate of the reflective glass and the Fresnel lens in the above structure is above 10%, the uniformity of light is reduced. Furthermore, the diffuse reflection cup causes the light to scatter in all directions, reducing the uniformity of light and resulting in uneven brightness in the projection effect. The closer the LED light source module is to the liquid crystal display unit, the worse the uniformity of light becomes. Conversely, the farther the LED light source module is from the liquid crystal display unit, the better the uniformity of light becomes, but the lower the luminous flux. Therefore, it is difficult to control the distance between the LED light source module and the liquid crystal display unit.

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

[0005] In view of the problems faced by the prior art, this utility model provides a projection device for viewing lyrics of a projection module through the projection light effect of the projection module.

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

[0007] A projection device includes: a base; a projection module mounted on the base, comprising a housing, a lamp body, a focusing element, a projection screen, and a lens assembly; the housing including a receiving space and a projection port communicating with the receiving space; the lamp body being received in the receiving space; the focusing element surrounding the lamp body, the focusing element including a lower opening and an upper opening communicating with each other, the upper opening being larger than the lower opening, the lower opening surrounding the lamp body, the focusing element including at least one reflector constituting the upper opening and the lower opening, the inner surface of the reflector being a reflective surface, the reflective surface being composed of a reflective film or a reflective sheet; or the focusing element... The device includes a positioning shell and a reflector mounted on the positioning shell. The reflector includes at least one reflector plate forming the upper opening and the lower opening. The inner surface of the reflector plate forms a reflective surface, and the reflector plate is positioned facing the lamp body. A projection screen is mounted on the light-gathering element, and the upper opening is positioned around the projection screen. A lens assembly is located above the projection screen. The reflector film, reflector plate, or reflector cover gathers the outwardly diffused light from the lamp body towards the center, changing the propagation path of at least part of the light. The light then passes through the projection screen and the lens assembly. The projection device projects lyrics, videos, patterns, or fonts onto a screen, wall, ceiling, or tabletop.

[0008] Furthermore, the plurality of reflectors are defined as two oppositely arranged first reflectors and two oppositely arranged second reflectors, the distance between the two first reflectors is greater than the distance between the two second reflectors, the length of the projection screen is defined as L, 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 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, wherein the inclination of the arc-shaped surface of the second reflector is greater than or equal to the inclination of the arc-shaped surface of the first reflector; or 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 curved surfaces of the first reflective surface and the second reflective surface are connected by a chamfered curved surface.

[0012] Furthermore, the projection device further includes a projection module 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 module projects upward, and at least part of the residual light falls onto the wall, the lyrics, patterns, and text presented by the projection module can be seen through the light effect formed by the projection module; or the projection module projects in a horizontal direction, and the strong light effect or weak light effect of the projection module is set around the light effect of the second projection component.

[0013] Furthermore, the projection module includes a housing and a lamp body, a focusing element, a projection screen, and a lens assembly mounted on the housing. 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 through a guide groove and a sliding post to achieve focusing, and the positioning ring is fixedly connected to the housing.

[0014] A projection device includes: a housing including a receiving space and a projection port communicating with the receiving space; a lamp body housed in the receiving space; a focusing element surrounding the lamp body, the focusing element having a lower opening and an upper opening opposite to each other, and at least one reflector constituting the upper opening and the lower opening, the reflector gradually moving away from the central axis of the focusing element from bottom to top, the reflector facing the lamp body, the inner surface of the reflector having a reflective surface; a projection screen located above the focusing element and fixedly connected to the focusing element, the projection screen being a monochrome screen; and a lens assembly located above the projection screen, wherein at least part of the light emitted by the lamp body passes through the upper opening, the projection screen, and the lens after its reflection path is changed by the reflective surface; the projection screen projects lyrics, videos, patterns, or fonts onto a screen surface, a wall, a ceiling, or a tabletop.

[0015] Furthermore, the light-concentrating element includes two first reflectors and two second reflectors arranged opposite to each other to form the upper opening. The inner surfaces of the first and second reflectors are provided with reflective films, reflective sheets, or reflective covers. The reflective film, reflective sheet, or reflective cover constitutes the reflective surface. The light-emitting area of ​​the lamp body is greater than or equal to the projection area of ​​the projection screen.

[0016] Furthermore, the reflective surface is configured as an arc-shaped surface, which extends obliquely from bottom to top. The inclination of the arc-shaped surface of the second reflector is greater than or equal to that of the arc-shaped surface of the first reflector. 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.

[0017] Furthermore, the projection screen includes two long sides and two short sides connecting the long sides. The focusing element includes two first reflectors corresponding to the two short sides and two second reflectors corresponding to the long sides. The angle formed by the tangent of the arc surface of the first reflector and the central axis of the focusing element is greater than the angle formed by the tangent of the arc surface of the second reflector and the central axis of the 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 angle 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.

[0018] Furthermore, the projection device further includes a projection module 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 module projects upward, and at least part of the residual light falls onto the wall, the lyrics, patterns, and text presented by the projection module can be seen through the light effect formed by the projection module; or the projection module projects in a horizontal direction, and the strong light effect or weak light effect of the projection module is set around the light effect of the projection module.

[0019] Furthermore, the projection module includes only the lamp body, the focusing element, the projection screen, and the lens group, with the lamp body dissipating heat through an aluminum reflector and / or heat dissipation holes; or the projection module includes only the lamp body, the focusing element, the heat-insulating and light-transmitting plate, the projection screen, and the lens group, with the lamp body dissipating heat through an aluminum reflector and / or heat dissipation holes.

[0020] Compared with the prior art, the projection device of this utility model has the following advantages:

[0021] The projection module includes a housing, a lamp body, a focusing element, a projection screen, and a lens assembly. The focusing element surrounds the lamp body and includes an interconnected lower and upper opening. The focusing element includes at least one reflector forming the upper and lower openings, with the inner surface of the reflector being a reflective surface composed of a reflective film or reflective sheet. Alternatively, the focusing element includes a positioning shell and a reflector mounted on the positioning shell. The reflector includes reflectors forming the upper and lower openings, with the inner surface of the reflectors forming a reflective surface. The projection screen is mounted on the focusing element, and the lens assembly is located above the projection screen. The reflective film, reflector, or reflector concentrates the outward-spreading light from the lamp body towards the center, changing the propagation path of at least part of the light. The light then passes through the projection screen and the lens assembly. The projection device projects lyrics, videos, patterns, or fonts onto a screen, wall, ceiling, or tabletop. Adding a reflective focusing structure to the lamp body concentrates the light emitted from the surroundings back towards the center, improving light utilization and illumination uniformity. [Attached Image Description]

[0022] Figure 1 This is an exploded perspective view of the projection device of this utility model;

[0023] Figure 2 for Figure 1 A 3D view of the projection component;

[0024] Figure 3 for Figure 2 Top view;

[0025] Figure 4 for Figure 3 A sectional view taken along line AA;

[0026] Figure 5 for Figure 2 3D exploded view;

[0027] Figure 6 for Figure 5 Top view of the central focusing element and projection screen;

[0028] Figure 7 for Figure 5 Exploded view of the central lamp body and the focusing element;

[0029] Figure 8 This is an exploded perspective view of the lamp body and focusing element according to another embodiment.

[0030] Explanation of reference numerals in the accompanying drawings for specific embodiments:

[0031] Projection device 100 Base 1 Containment cavity 11 Guide groove 112 Projection hole 113 Projection Module 2 Light source 21 Optical element 22 Driver Component 23 Optical devices 24 Projection Module 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 339 Reflector 340 Projection screen 34 Lens Group 35 Positioning ring 351 Imaging lens 352

Detailed Implementation Methods

[0032] 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.

[0033] like Figures 1 to 8 As shown, the projection device 100 of this utility model includes a base 1, a projection module 2 and a projection assembly 3 mounted on the base 1. The central axis of the projection module 2 and the central axis of the projection assembly 3 form an angle θ, 0°≤θ≤180°, preferably 0° to 120°. The projection module 2 and the projection assembly 3 can be turned on simultaneously or one of them can be turned on individually.

[0034] like Figure 1 and Figure 2 As shown, the base 1 includes a receiving cavity 111 and a guide groove 112 and a projection hole 113 that are connected to the receiving cavity 111.

[0035] like Figure 1 , Figure 2 As shown, the projection module 2 is housed in the receiving cavity 11. The projection module 2 includes a light source 2121 and at least one optical element 22 located above the light source 2121. The optical element 22 is configured as at least one of the following: a projection sheet, an interference sheet, a projection mask, a corrugated sheet, a grating sheet, a reflector, a convex lens, or a beam splitter. The light source 2121 is at least one LED or laser, selected from monochromatic or multicolor, multi-sheet, standard or special LEDs or lasers. The projection module 2 also includes a driving assembly 23, which drives the light source 2121 and / or the optical element 22 to rotate. The light source 2121 or the optical element 22 is configured to rotate at a constant speed, a variable speed, or in the forward direction and / or in the reverse direction. In this embodiment, the projection module 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 cover with an irregularly elongated lens, a condenser cover with multiple facets, or a condenser lens. The projection module 2 projects light effects toward a ceiling, wall, or floor, wherein the projection light effects include at least one of the following: aurora borealis, galaxy, constellation, water ripples, sky, clouds, starry sky, moon, luminous pattern, signage, or commercial advertisement. The projection module 2 forms a gradient light effect, with the intensity of the projection optics gradually weakening from the center to the outer edge. The projection light effect formed by the projection module 2 is projected onto the ceiling, wall, or floor.

[0036] like Figure 5 , Figure 6 and Figure 7As shown, the projection module 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 module 3 with the light effect of the projection module 2 changes, or the lyrics, font or pattern projection formed by the projection module 3 overlaps with different forms of light effect formed by the projection module 2. The connection structure between the projection module 3 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 module 3. The projection module 3 rotates 0° to 90° upward and / or downward and / or rotates 0° to 90° to the left and / or right, and the projection module 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 module 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 module 3 includes a housing 31, a lamp body 32, a focusing element 33, a projection screen 34, and an imaging lens 352 mounted on the housing 31. The lamp body 32, the focusing element 33, the projection screen 34, and the imaging lens 352 are arranged sequentially from bottom to top. The focal length of the imaging lens 352 is defined as F, and the distance between the projection screen 34 and the imaging lens 352 is between 1F and 2F. The projection module 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 latching part 316. The positioning pin 313 cooperates with the positioning hole 314, and the hook 315 is fastened to the latching 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 module 3 includes only the lamp body 32, the focusing member 33, the projection screen 34, and the imaging lens 352. The lamp body 32 dissipates heat through an aluminum substrate and / or heat dissipation holes; or the projection module 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 352. 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 339 and a reflector 340 mounted on the positioning shell 339, with multiple reflectors facing the lamp body 32 (see [reference]). Figure 8The positioning shell 339 and the reflector 340 are formed independently or integrally. When integrally formed, the reflective film is formed. The reflector 340 includes at least one reflector constituting the upper opening and the lower opening, and the inner surface of the reflector constitutes a reflective surface 335. 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 and constituting the upper opening 332 and the lower opening 331. The square projection screen 34 is adapted to the upper opening. The surfaces of the first reflectors 333 and the second reflectors 334 are provided with reflective films or reflective sheets, thus constituting the reflective surface 335. The reflective surface 335 is an arc-shaped surface, and the inclination curvature of the arc-shaped surface gradually changes. 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 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 33 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 352 after its optical path is changed by the reflective film, the reflector sheet, or the reflector cover 340. The luminous area of ​​the lamp body 32 is greater than or equal to the projection area of ​​the projection screen 34. The focusing element 33 also includes a plurality of limiting blocks 336 and clearance grooves 337 arranged around the opening. The plurality of 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 projection screen 34 is fixed to the focusing element 33 or the housing 31 by adhesive. The clearance 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 lens assembly 35 includes a positioning ring 351 and an imaging lens 352 352. The internal thread of the positioning ring 351 engages with the external thread of the imaging lens 352 352 for focusing the lens assembly 35. Alternatively, the positioning ring 351 and the imaging lens 352 352 engage through a guide groove and a sliding post to achieve focusing. The positioning ring 351 is fixedly connected to the housing 31.

[0037] 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 32 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 2121 and the projection screen 34, the illumination uniformity gradually becomes more uniform as the lamp body 32 gets closer to the projection screen 34. In addition, because the larger the included angle α is, the higher the lumen value of the lamp body 32 is and the higher the light utilization rate, the more heat the lamp body 32 generates, which can easily cause the temperature to exceed the temperature that the projection screen 34 can withstand, making the projection screen 34 turn blue or its non-projection area 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 research and development and multiple experiments. According to 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 light uniformity X = 1.05–1.35, and D = 2L–3L; when α = 30°, the light utilization rate is 35%–44%, the light uniformity X = 3.5–4.5, and D = 1.2L–2L; when α = 40°, the light utilization rate is 45%–53%, the light uniformity X = 3.2–4.3, and D = 1L–1.5L; when α = 50°, the light utilization rate is 54%–60%, the light uniformity X = 2.6–4, and D = 0.8L–1L; when α = 60°, the light utilization rate is 61%–71%, the light uniformity X = 1.5–3, and D = 0.6L–0.8L; when α = 70°, ... The light utilization rate is 66%–73%, the light uniformity is X = 1.4–2.8, and D = 0.5L–0.65L; when α = 80°, the light utilization rate is 70%–77%, the light uniformity is X = 1.2–1.6, and D = 0.43L–0.5L; when α = 90°, the light utilization rate is 80%–88%, the light uniformity is X = 1.04–1.3, and D = 0.35L–0.43L; when α = 100°, the light utilization rate is 83%–94%, the light uniformity is X = 1.1–1.5, and D = 0.29L–0.35L; when α = 110°, the light utilization rate is 88%–96%, the light uniformity is 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 33 is 45% to 88%, and the illumination uniformity X = 1.04 to 4.3. When the included angle between the two first reflectors 333 α When the angle is between 40° and 100°, the relationship between L and D The relationship between them satisfies D = 0.27L to 1.5L, the luminous flux utilization rate of the focusing element 33 is 40% to 94%, and the illumination uniformity X =1.1~4.3. When the included angle between the two first reflectors 333 α The angle is 50° to 90°. The relationship between L and D satisfies D = 0.35L~1L, the luminous flux utilization rate of the focusing element 33 is 54%~88%, and the illumination uniformity X = 1.04~4. The projection light effect of the projection module 2 constitutes the ambient effect of the projection module 3. The projection module 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 table. When the projection screen 34 receives the lyrics information transmitted from the motherboard, it lights up the corresponding liquid crystal to form the lyrics projection. As the lyrics projection of the projection module 3 changes, the projection module 2 automatically or manually projects red light effects, blue light effects, green light effects, or any combination of the three colors, or a rhythmic light effect, or changes the projection pattern. A speaker installed on the base 1 receives the audio file transmitted from the motherboard and plays the sound. When a song is at a high pitch, the rotation speed of the first projection component 2 gradually increases or presents a rhythmic light effect; when a song progresses to a low pitch, the rotation speed of the projection module 2 gradually decreases or remains constant. The lyrics projected by the projection module 3 fall onto a wall, screen, or floor. The projection light effect of the projection module 2 surrounds the lyrics, or the lyrics can be observed through the light effect formed by the projection module 2. When the projection device 100 is connected to a microphone, karaoke can be performed. The projection module 2 includes a central strong light effect and a surrounding weak light effect. The lyrics, fonts, or patterns are projected through the central optics and / or outer edge optics of the projection module 2. When the projection module 2 projects upwards, the projection module 3 projects horizontally, and the light effect projected by the projection module 3 is seen through the weak light effect formed by the projection module 2; or the projection module 2 projects horizontally, and the strong or weak light effect of the projection module 3 surrounds the light effect of the projection module 3. Alternatively, when the projection module 2 projects upwards, and at least some of the peripheral light falls onto the wall, the lyrics, patterns, or text presented by the projection module 3 are seen through the peripheral light formed by the projection module 3; or the projection module 2 projects horizontally.

[0038] In summary, the projection device 100 of this utility model has the following beneficial effects:

[0039] (1) The projection module 3 includes a housing 31, a lamp body 32, a focusing element 33, a projection screen 34, and a lens assembly 35; the focusing element 33 is arranged around the lamp body 32, and the focusing element 3335 includes a lower opening 331 and an upper opening 332 that are interconnected; the focusing element 33 includes at least one reflector constituting the upper opening 332 and the lower opening 331, and the inner surface of the reflector is a reflective surface 335, which is composed of a reflective film or a reflective sheet; or the focusing element 3335 includes a positioning shell 339 and a reflector installed on the positioning shell 339. The light cover 340 includes a reflector forming an upper opening 332 and a lower opening 331, with the inner surface of the reflector forming a reflective surface 335. A projection screen 34 is mounted on the light-concentrating element 33, and a lens group 35 is located above the projection screen 34. The reflective film, reflector, or reflector 340 concentrates the outwardly diffused light from the lamp body 32 towards the center, changing the propagation path of at least part of the light. The light then passes through the projection screen 34 and the lens group 35. The projection device 100 projects lyrics, videos, patterns, or text onto a screen, wall, ceiling, or tabletop. Adding a reflective light-concentrating structure to the lamp body 32 concentrates the light emitted from the surrounding area back towards the center, improving light utilization and illumination uniformity.

[0040] (2) Define the horizontal direction as the starting point for the swing of the projection module 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 module 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, which makes it easy to control the lumen value of the lamp body 32 and improve the life of the projection screen 34.

[0041] (3) The focusing element 33 includes two first reflectors 333 and two second reflectors 334 arranged around the lamp body 32. The length of the projection screen 34 is defined as L, and the distance between the projection screen 34 and the lamp body 32 is defined as D. When the included angle between the two oppositely arranged first reflectors 333 is between 40° and 90°, the relationship between L and D satisfies D = 0.35L to 1.5L. The luminous flux utilization rate of the focusing element 33 is 45% to 88%, and the illumination uniformity X = 1.04 to 4.3. Through multiple test data, a suitable included angle and the relationship between L and D are reasonably selected.

[0042] (4) The arc surface of the first reflector 333 and the arc surface of the second reflector 334 are connected by a chamfered arc surface 338, which makes the reflected light more focused in the center. The existing right-angle connection structure will cause the light reflected in the center to scatter. Therefore, the chamfered arc surface 338 improves the light utilization rate.

[0043] 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: seat body; The projection module is installed on the base and includes a housing, a lamp body, a focusing element, a projection screen, and a lens assembly. The housing includes a receiving space and a projection port communicating with the receiving space; The lamp body is housed within the housing space; The focusing element is arranged around the lamp body. The focusing element includes a lower opening and an upper opening that are connected to each other. The upper opening is larger than the lower opening. The lower opening is arranged around the lamp body. The focusing element includes at least one reflector constituting the upper opening and the lower opening. The inner surface of the reflector is a reflective surface, which is composed of a reflective film or a reflective sheet. Alternatively, the focusing element may include a positioning shell and a reflector mounted on the positioning shell, the reflector including at least one reflector plate forming the upper opening and the lower opening, the inner surface of the reflector plate forming a reflective surface, and the reflector plate being disposed towards the lamp body; The projection screen is mounted on the light-concentrating component, and the upper opening is arranged around the projection screen; The lens assembly is located above the projection screen. The reflective film, reflector, or reflector cover focuses the outward-spreading light from the lamp body towards the center, changing the propagation path of at least part of the light. The light then passes through the projection screen and the lens assembly. The projection device projects lyrics, videos, patterns, or fonts onto a screen, wall, ceiling, or desktop.

2. The projection device as described in claim 1, characterized in that: The plurality of reflectors are defined as two oppositely arranged first reflectors and two oppositely arranged second reflectors, the distance between the two first reflectors is greater than the distance between the two second reflectors, the length of the projection screen is defined as L, 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 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 of inclination of the arc-shaped surface of the second reflector is greater than or equal to the angle of inclination of the arc-shaped surface of the first reflector; or 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 2, 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 claim 3 or 4, characterized in that: The curved surfaces of the first reflector and the second reflector are connected by a chamfered curved surface.

6. The projection device as described in any one of claims 1-4, characterized in that: The projection device further includes a projection module 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 module projects upward, and at least part of the residual light falls onto the wall, the lyrics, patterns, or text presented by the projection module can be seen through the light effect formed by the projection module; or the projection module projects in a horizontal direction, and the strong light effect or weak light effect of the projection module is set around the light effect of the projection module.

7. The projection device as described in any one of claims 1-4, characterized in that: The projection module includes a housing and a lamp body, a focusing element, a projection screen, and a lens assembly mounted on the housing. 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 can engage through a guide groove and a sliding post to achieve focusing, and the positioning ring is fixedly connected to the housing.

8. A projection device, characterized in that, include: The housing includes a receiving space and a projection port communicating with the receiving space; The lamp body is housed within the housing space; A focusing element is arranged around the lamp body, with a lower opening and an upper opening opposite to each other, and at least one reflector constituting the upper opening and the lower opening. The reflector gradually moves away from the central axis of the focusing element from bottom to top, and is positioned towards the lamp body. The inner surface of the reflector is provided with a reflective surface. A projection screen is located above the light-concentrating element and is fixedly connected to the light-concentrating element; the projection screen is a monochrome screen. The lens assembly is located above the projection screen. At least part of the light emitted by the lamp body changes its reflection path after passing through the reflective surface, and then passes through the upper opening, the projection screen, and the lens. The projection screen projects lyrics, videos, patterns, or fonts.

9. The projection device as described in claim 8, characterized in that: The light-concentrating element includes two first reflectors and two second reflectors arranged opposite to each other to form the upper opening. The inner surfaces of the first and second reflectors are provided with reflective films, reflective sheets, or reflective covers. The reflective film, reflective sheet, or reflective cover constitutes the reflective surface. The light-emitting area of ​​the lamp body is greater than or equal to the projection area of ​​the projection screen.

10. The projection device as claimed in claim 9, characterized in that: The reflective surface is configured as an arc-shaped surface, which extends obliquely from bottom to top. The inclination of the arc-shaped surface of the second reflector is greater than or equal to that of the arc-shaped surface of the first reflector. The angle formed by the tangent of the arc-shaped surface of the first reflector and the central axis of the light-concentrating element gradually decreases.

11. The projection device as described in any one of claims 8-10, characterized in that: The projection screen includes two long sides and two short sides connecting the long sides. The focusing element includes two first reflectors corresponding to the two short sides and two second reflectors corresponding to the long sides. The angle formed by the tangent of the arc surface of the first reflector and the central axis of the focusing element is greater than the angle formed by the tangent of the arc surface of the second reflector and the central axis of the 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 angle 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.

12. The projection device as described in any one of claims 8-10, characterized in that: The projection device further includes a projection module 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 module projects upward, and at least part of the residual light falls onto the wall, the lyrics, patterns, or text presented by the projection module can be seen through the light effect formed by the projection module; or the projection module projects in a horizontal direction, and the strong light effect or weak light effect of the projection module is set around the light effect of the projection module.

13. The projection device as described in any one of claims 8-10, characterized in that: The projection module includes only the lamp body, the focusing element, the projection screen, and the lens assembly, with the lamp body dissipating heat through an aluminum reflector and / or heat dissipation holes; or the projection module includes only the lamp body, the focusing element, the heat-insulating and light-transmitting plate, the projection screen, and the lens assembly, with the lamp body dissipating heat through an aluminum reflector and / or heat dissipation holes.

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