Wide-angle starry sky projection lamp

Abstract

The wide-angle starry sky projection lamp comprises a main body, a light source, a film tray and a projection lens, and the film tray is separably inserted into a space formed between the light source and the projection lens; a light gathering device is arranged between the light source and the film tray and is suitable for gathering light rays emitted by the light source in an area where the film is located; in the projection lens, in the projection direction of a film, an imaging lens configured as a single convex aspheric lens with positive focal power; the collimating lens is configured to be a biconvex aspheric lens with positive focal power; the wide-angle lens is configured to be a single concave aspherical lens with negative focal power; light with a preset film pattern is projected on a specified interface after passing through the imaging lens, the collimating lens and the wide-angle lens so as to form a starry sky projection effect, the projection lens in the projection lamp realizes effective control and optimization of the light by reasonably configuring the focal power and the shape of each lens, and the definition and the brightness of a projection picture are high.

Description

Technical Field

[0001] The utility model relates to the technical field of optical equipment, in particular to a wide-angle starry sky projection lamp. Background Art

[0002] The principle of projection lamp is mainly based on optical imaging technology, which magnifies the image and projects it onto the screen through a series of optical elements. With the advancement of science and technology, the application of home projection equipment has become popular among users.

[0003] The main research and development direction of existing projection lamps is to present patterns in a diversified manner while ignoring the specific effects of the patterns. Therefore, most existing projection lamps have low clarity and brightness of the projected patterns, which seriously affects the user experience.

[0004] Therefore, it is necessary to design a projector with clear imaging and high brightness. Utility Model Content

[0005] The utility model provides a wide-angle starry sky projection lamp to solve the problems existing in the prior art.

[0006] The utility model adopts the following technical solutions:

[0007] A wide-angle starry sky projection lamp comprises a main body, a light source, a film tray and a projection lens. The film tray can be detachably inserted into the space formed between the light source and the projection lens. A focusing device is arranged between the light source and the film tray, and is suitable for focusing light emitted by the light source into the area where the film is located. The projection lens has the following components arranged in sequence in the projection direction of the film: an imaging lens, which is configured as a single convex aspheric lens with positive optical power; a collimating lens, which is configured as a double convex aspheric lens with positive optical power; and a wide-angle lens, which is configured as a single concave aspheric lens with negative optical power. Light carrying a preset pattern on the film is projected onto a specified interface after passing through the imaging lens, the collimating lens and the wide-angle lens to form a starry sky projection effect.

[0008] The utility model designs a wide-angle starry sky projection lamp. The projection lens in the projection lamp is sequentially arranged with an imaging lens, a collimating lens and a wide-angle lens. By rationally configuring the optical focal length and shape of each lens, effective control and optimization of light are achieved. The projection picture has high clarity, high brightness and a wide projection range. The structure of the projection lens is simplified, the volume of the projection lens is reduced, the production cost and installation difficulty are reduced, and the convenience and flexibility of use are improved.

[0009] Preferably, the light focusing device comprises: a lower light focusing device and an upper light focusing device sequentially arranged in a direction away from the light source, wherein the upper and lower light focusing devices are both single convex aspheric lenses.

[0010] Preferably, the curvature radius of the lower light-concentrating device is smaller than the curvature radius of the upper light-concentrating device, so that the refraction effect on the light is stronger and the light can be focused more effectively into a smaller area.

[0011] Preferably, the light focusing device comprises a spherical lens.

[0012] Preferably, the refractive surface of the imaging lens facing the imaging side is configured as an arc-shaped convex surface, which reduces the phase difference and can concentrate light to increase the clarity and brightness of the pattern.

[0013] Preferably, the refractive surfaces on both sides of the collimating lens are configured as arc-shaped convex surfaces that are symmetrically arranged to convert the divergent light into parallel light. The symmetrical arrangement of the arc-shaped convex surfaces can optimize the light propagation path and reduce aberrations.

[0014] Preferably, the refractive surface of the wide-angle lens close to the imaging side is configured as an arc-shaped concave surface, which can project a wider pattern.

[0015] Preferably, the distance from the wide-angle lens to the collimating lens is greater than the distance from the collimating lens to the imaging lens, which can optimize the clarity and size of the projected image.

[0016] Preferably, the light source, the focusing device, the film and the projection lens are all arranged on the same axis, so that the light emitted by the light source is concentrated in the area where the film is located, thereby improving the utilization rate of the light and the brightness of the projected image.

[0017] Preferably, a first mounting hole is opened on the main body, the film tray is arranged in the first mounting hole and extends into the main body, the film is arranged on the film tray, and the film tray can be pulled out to replace the film.

[0018] Preferably, a rotating plate is provided on the film tray, a second mounting hole is opened on the rotating plate, and the film is configured to be mounted on the second mounting hole.

[0019] Preferably, a notch is provided on the film tray, the outer peripheral wall of the rotating plate is exposed at the notch, and is configured to be toothed and meshing with a gear, so that the rotating plate is driven by the driving gear to rotate, and the film is rotated by the rotating plate, so that the projected image also rotates.

[0020] The projection lens of this utility model sequentially arranges an imaging lens, a collimating lens, and a wide-angle lens. By rationally configuring the optical power and shape of each lens, effective control and optimization of light are achieved, resulting in a projected image with high clarity, high brightness, and a wide projection range. This simplifies the structure of the projection lens, reduces its size, reduces production costs and installation difficulty, and improves ease of use and flexibility. The film tray can be detachably inserted into the space formed between the light source and the projection lens. The film tray is equipped with a rotating plate and drive gear, allowing for easy replacement of film patterns and achieving a rotating effect for the projected image, increasing the diversity and interest of the projection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, and are not limitations to the present application.

[0022] Figure 1 This is a cross-sectional view of the projection lens of the utility model. Figure 1 ;

[0023] Figure 2 It is the overall structural diagram of the utility model;

[0024] Figure 3 It is a cross-sectional view of the overall structure of the utility model;

[0025] Figure 4 This is a structural diagram of the projection lens and lens mounting seat of the utility model;

[0026] Figure 5 This is a schematic structural diagram of the projection lens and the rotating bracket of the utility model;

[0027] Figure 6 It is a structural explosion diagram of the utility model;

[0028] Figure 7 This is a schematic diagram of film replacement in the present invention;

[0029] Figure 8 It is a cross-sectional view of another embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1-main body; 10-first mounting hole; 2-projection lens; 20-wide-angle lens; 21-collimating lens; 22-imaging lens; 24-protrusion; 3-lens mounting seat; 30-card slot; 31-arc-shaped protrusion; 4-film tray; 5-rotating plate; 50-second mounting hole; 6-light source; 60-focusing device; 601-upper focusing device; 602-lower focusing device; 7-driving gear; 8-rotating bracket; 80-limiting slot. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] Unless otherwise defined, technical or scientific terms used in this patent document shall have the ordinary meaning as understood by persons of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar expressions used in this patent specification and claims do not denote any order, quantity, or importance, but are merely used to distinguish one component from another. Similarly, terms such as "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects preceding the phrase "include" or "comprising" include the elements or objects listed after the phrase and their equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used solely to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These terms are used solely to facilitate the description of this application and to simplify the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are not to be construed as limitations on this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0037] Example 1:

[0038] See also Figure 1-Figure 7 As shown, the utility model provides a wide-angle starry sky projection lamp, comprising a main body 1, a light source 6, a film tray 4 and a projection lens 2. The film tray 4 can be detachably inserted into the space formed between the light source 6 and the projection lens 2, so that the user can easily change different film patterns as needed.

[0039] See also Figure 3 A focusing device 60 is disposed between the light source 6 and the film tray 4. The focusing device 60 comprises a lower focusing device 602 and an upper focusing device 601, arranged sequentially away from the light source 6. Both the upper and lower focusing devices are single-convex aspheric lenses. The curvature radius of the lower focusing device 602 is smaller than that of the upper focusing device 601, resulting in a stronger refraction effect on light, more effectively focusing light onto a smaller area. This helps improve the brightness of the projection lamp and the efficiency of light energy utilization, resulting in a brighter and more vivid projection effect. The light source 6 and focusing device 60 are both disposed on the same side of the imaging lens 22, and the light source 6, focusing device 60, film, and projection lens 2 are all arranged on the same axis to ensure accurate light transmission.

[0040] See also Figure 1, an imaging lens 22, a collimating lens 21 and a wide-angle lens 20 are arranged in sequence in the projection direction of the film in the projection lens 2. The imaging lens 22 is configured as a single convex aspheric lens with positive optical focal length, and its refractive surface facing the imaging side is configured as an arc-shaped convex surface. Such a design can gather light and increase the clarity and brightness of the pattern. The collimating lens 21 is configured as a double convex aspheric lens with positive optical focal length, and its refractive surfaces on both sides are configured as arc-shaped convex surfaces arranged symmetrically with each other, which can convert divergent light into parallel light, optimize the light propagation path, reduce aberrations, and improve picture clarity. The wide-angle lens 20 is configured as a single concave aspheric lens with negative optical focal length, and its refractive surface close to the imaging side is configured as an arc-shaped concave surface. Such a design can project a wider pattern and meet the needs of wide-angle projection. The distance between wide-angle lens 20 and collimating lens 21 is greater than the distance between collimating lens 21 and imaging lens 22, optimizing the clarity of the projected image. Light carrying the film's preset pattern passes through imaging lens 22, collimating lens 21, and wide-angle lens 20 and is projected onto a defined surface, creating a starry sky projection effect. The resulting image is clear, bright, and has a wide projection range.

[0041] See also Figure 3-Figure 5 Regarding the installation and adjustment of the projection lens 2, the projection lens 2 and the lens mount 3 are threadedly connected and are both located on the same side of the film. This design allows the projection lens 2 to reciprocate relative to the lens mount 3 along the axis of the projection lens 2, thereby adjusting the distance between the projection lens 2 and the light source 6 and thus the projection distance. A rotating bracket 8 is mounted on the end of the projection lens 2 away from the lens mount 3. The inner wall of the rotating bracket 8 is provided with a stopper groove 80 that mates with a protrusion 24 on the outer wall of the projection lens 2. Rotating the rotating bracket 8 adjusts the distance between the projection lens 2 and the light source 6, thereby achieving fine-tuning of the focal length. The lower end of the rotating bracket 8 engages with a slot 30 provided on the upper end of the lens mount 3. The upper end of the slot 30 is provided with an arc-shaped protrusion 31. When the rotating bracket 8 is engaged with the lens mount 3, the engaging portion at the lower end of the rotating bracket 8 slides into the slot 30 via the arc-shaped protrusion 31. This design facilitates installation and improves ease of use.

[0042] See also Figure 6-Figure 7The film tray 4 is designed with a first mounting hole 10 defined in the main body 1. The film tray 4 is positioned within this first mounting hole 10 and extends into the main body 1. The film is mounted on the film tray 4. To change the projection pattern, the film tray 4 is pulled out of the main body 1 and replaced with the new film. A rotating plate 5 is provided on the film tray 4, which has a second mounting hole 50 defined therein. The film is configured to be mounted in the second mounting hole 50, which has an opening area that matches the size of the film. Light from the light source 6 passes through the second mounting hole 50 and illuminates the film. The projection lens 2 then projects the pattern onto the projection surface. In this embodiment, the size of the pattern projected by the starry sky projection lamp of the present application is 1000 to 5000 mm. By rotating the projection lens 2 so that it reciprocates relative to the lens mount 3 along the axis of the projection lens 2, and by changing the distance between the projection lens 2 and the light source 6, a clear and bright pattern can be projected at a distance of 1000 to 5000 mm. A notch 40 is provided on the film tray 4, and the outer peripheral wall of the rotating plate 5 is exposed at the notch 40 and is configured to have a toothed shape that can mesh with a gear. The driving gear 7 meshes with the outer peripheral wall of the rotating plate 5. When the driving gear 7 rotates, it drives the rotating plate 5 to rotate. The rotation of the rotating plate 5 drives the film to rotate, causing the projected image to rotate, thereby increasing the dynamics and interest of the projection effect.

[0043] Example 2:

[0044] Compared with implementation 1, the following differences exist:

[0045] See also Figure 4 A focusing device 60 is positioned between the light source 6 and the film tray 4. This focusing device 60 is configured as a spherical lens with a radius of preferably 6.5 mm. This sizing effectively focuses the light emitted by the light source 6 within the film area, improving light utilization and projected image brightness. The light source 6 and the spherical lens are positioned on the same side of the projection lens 2, and the light source 6, spherical lens, film, and projection lens 2 are all aligned on the same axis to ensure accurate light transmission.

[0046] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A wide-angle starry sky projection lamp, comprising a main body (1), a light source (6), a film tray (4) and a projection lens (2), wherein the film tray (4) is detachably inserted into a space formed between the light source (6) and the projection lens (2); characterized in that: A light focusing device (60) is disposed between the light source (6) and the film tray (4), and the light focusing device (60) is suitable for focusing the light emitted by the light source (6) into the area where the film is located; The projection lens (2) has the following components arranged in sequence in the projection direction of the film: an imaging lens (22) configured as a single convex aspheric lens with positive optical power; a collimating lens (21) configured as a biconvex aspheric lens with positive optical power; and A wide-angle lens (20) configured as a single concave aspheric lens with negative optical power; Light carrying a preset film pattern is projected onto a specified interface after passing through the imaging lens (22), the collimating lens (21), and the wide-angle lens (20) to form a starry sky projection effect.

2. The projection lamp according to claim 1, wherein The light focusing device (60) comprises: a lower light focusing device (602) and an upper light focusing device (601) arranged in sequence in a direction away from the light source (6), wherein the upper and lower light focusing devices are both single convex aspheric lenses.

3. The projection lamp according to claim 2, wherein: The curvature radius of the lower light-concentrating device (602) is smaller than the curvature radius of the upper light-concentrating device (601).

4. The projection lamp according to claim 1, wherein The light focusing device (60) comprises a spherical lens.

5. The projection lamp according to claim 1, wherein The refractive surface of the imaging lens (22) facing the imaging side is configured as an arc-shaped convex surface.

6. The projection lamp according to claim 1, wherein The refractive surfaces on both sides of the collimating lens (21) are configured as arc-shaped convex surfaces that are symmetrically arranged with respect to each other.

7. The projection lamp according to claim 1, wherein The refractive surface of the wide-angle lens (20) close to the imaging side is configured as an arc-shaped concave surface.

8. The projection lamp according to claim 1, wherein The distance between the wide-angle lens (20) and the collimating lens (21) is greater than the distance between the collimating lens (21) and the imaging lens (22).

9. The projection lamp according to claim 1, wherein The light source (6), the focusing device (60), the film and the projection lens (2) are all arranged on the same axis.

10. The projection lamp according to claim 1, wherein A first mounting hole (10) is provided on the main body (1), the film tray (4) is arranged in the first mounting hole (10) and extends into the main body (1), and the film is arranged on the film tray (4).

11. The projection lamp according to claim 10, wherein A rotating plate (5) is provided on the film tray (4), a second mounting hole (50) is provided on the rotating plate (5), and the film is configured to be mounted on the second mounting hole (50).

12. The projection lamp according to claim 11, wherein A notch (40) is provided on the film tray (4), and the outer peripheral wall of the rotating plate (5) is exposed at the notch (40) and is configured to be toothed and meshed with a gear, so that the rotating plate (5) is driven to rotate by the driving gear (7).

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