Projection lamp lens

Abstract

The utility model provides a projection lamp lens. The projection lamp lens comprises a condensing lens assembly, a film with an imaging pattern, a projection lens assembly and an anti-dazzle lens which are sequentially arranged along the direction of a main optical axis, wherein one side, facing the condensing lens assembly, of the film is obliquely arranged; the anti-dazzle lens comprises an image source surface which faces the projection lens assembly and forms an included angle alpha with a main optical axis, and a projection surface which is far away from the projection lens assembly and is vertical to the main optical axis; wherein the included angle alpha is greater than 78 degrees and less than 82 degrees. According to the projection lamp lens provided by the utility model, the inclination degree of the anti-dazzle lens and the film is adjusted during optical design, so that the ghosting phenomenon in a projection lamp can be effectively eliminated, the definition and the stability of a projected image are improved, the production efficiency is improved, and the product development cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, and particularly to a projection lamp lens. Background Art

[0002] Projection lamps are widely used in fields such as advertising display, stage effects, and car greeting. They achieve a predetermined visual effect by projecting images or texts onto a target surface. However, during the projection process, due to design defects or installation errors of the light source, lens, and projection pattern film, a ghosting phenomenon may occur. This ghosting not only reduces the clarity of the image but also causes distortion of the projection effect, affecting the visual experience. Traditional projection lamp designs usually adopt a single light source and a simple lens structure. Although they can project images to a certain extent, optical path deviation is likely to occur during the projection process, leading to the problem of image ghosting. In addition, improper placement angle or uneven surface of the projection pattern film will exacerbate the ghosting phenomenon.

[0003] To solve the above problems, some methods have been proposed in the prior art. For example, increasing the precision of the lens, adjusting the light-emitting angle of the light source, or adopting a multi-layer lens combination. However, these methods either increase the manufacturing cost of the product or complicate the installation and debugging process, and it is difficult to be widely promoted in practical applications. Therefore, there is still a need for an effective and low-cost technical means to reduce or eliminate the ghosting phenomenon in projection lamps, thereby improving the clarity and stability of projection images. Summary of the Utility Model

[0004] Aiming at the above problems, the purpose of the utility model is to provide a projection lamp lens to reduce or eliminate the ghosting phenomenon in projection lamps and improve the clarity and stability of projection images.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides a projection lamp lens, which includes a condenser lens assembly, a film with an imaging pattern, a projection lens assembly, and an anti-glare lens arranged in sequence along the main optical axis direction; wherein, the film is inclined towards the condenser lens assembly; the anti-glare lens includes an image source surface facing the projection lens assembly and having an angle α with the main optical axis, and a projection surface away from the projection lens assembly and perpendicular to the main optical axis; wherein, the angle α satisfies: 78° < α < 82°.

[0007] Further preferably, the film has an angle β with the main optical axis, and the angle β satisfies: 88° < β < 90°.

[0008] Further preferably, the maximum edge thickness ETmax and the minimum edge thickness ETmin of the anti-glare lens satisfy: 2 < ETmax / ETmin < 3.

[0009] Further preferably, the anti-glare lens has a optical power, and its focal length fn satisfies: 2000 ≤ |fn| ≤ 3000.

[0010] Further preferably, both the image source surface and the projection surface of the anti-glare lens are circular planes.

[0011] Further preferably, the projection lens assembly sequentially includes a first projection lens, a second projection lens, and a third projection lens along the principal optical axis direction. The first projection lens has a positive optical power, and both its image source surface and projection surface are convex surfaces; the second projection lens has a negative optical power, and both its image source surface and projection surface are concave surfaces; the third projection lens has a positive optical power, and both its image source surface and projection surface are convex surfaces.

[0012] Further preferably, the first projection lens, the second projection lens, the third projection lens, and the anti-glare lens are coaxially arranged.

[0013] Further preferably, the condenser lens assembly sequentially includes a first condenser lens and a second condenser lens along the principal optical axis direction. Among them, the optical axis of the second condenser lens has an included angle γ with the principal optical axis of the projection lamp lens, and the included angle γ satisfies: 3° < γ < 15°.

[0014] Further preferably, the film is a circular structure, and both its image source surface and projection surface are flat planes

[0015] Further preferably, the film and the anti-glare lens are made of glass.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] For the projection lamp lens provided by the present utility model, by adjusting the inclination degrees of the anti-glare lens and the film during optical design, the double image phenomenon in the projection lamp can be effectively eliminated, the clarity and stability of the projection image can be improved, and the production efficiency is increased and the product development cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0019] Figure 1 is a schematic structural diagram of the projection lamp lens provided by the embodiment of the present utility model;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the anti-glare lens in

[0021] Figure 3 is Figure 1Schematic diagram of the structure of the film

[0022] Figure 4 is Figure 1 Schematic diagram of the structure of the condenser lens assembly

[0023] Wherein: A - condenser lens assembly, B - projection lens assembly, 1 - image source, 2 - first condenser lens, 3 - second condenser lens, 4 - film, 5 - first projection lens, 6 - second projection lens, 7 - third projection lens, 8 - anti-glare lens

[0024] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings Specific embodiments

[0025] To better understand the present invention, more detailed descriptions will be made on various aspects of the present invention with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present invention and do not limit the scope of the present invention in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items

[0026] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention

[0027] It should also be understood that the terms "include", "include having", "have", "contain" and / or "contain having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or their combinations. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing the embodiments of the present invention, the use of "may" means "one or more embodiments of the present invention". And the term "exemplary" is intended to refer to an example or illustration

[0028] Unless otherwise defined, all terms (including technical and scientific terms) used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0029] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The following will detail this utility model with reference to the drawings and in combination with the embodiments.

[0030] A projection lamp lens includes a condenser lens assembly A, a film 4, a projection lens assembly B, and an anti-glare lens 8 arranged in sequence along the main optical axis. Among them, the condenser lens assembly A is mainly used to adjust the width of the light beam so as to adjust the size of the projection image according to the projection distance and the screen size; the film 4 has an imaging pattern; the main function of the projection lens assembly B is to achieve light focusing and imaging, correct aberration, and improve the imaging quality; the anti-glare lens 8 can reduce and prevent light from reflecting inside the lens, thereby avoiding the generation of glare and ghosting phenomena.

[0031] Furthermore, the anti-glare lens 8 includes an image source surface facing the projection lens assembly B and having an angle α with the main optical axis, and a projection surface away from the projection lens assembly B and perpendicular to the main optical axis; wherein, the angle α satisfies: 78° < α < 82°. With such a setting, the image source surface having an angle α with the main optical axis can reduce or even prevent light from reflecting inside the lens, avoiding the generation of glare and ghosting phenomena; the other projection surface perpendicular to the main optical axis can make the external shape of the projection lamp lens beautiful and be reasonably matched with the surrounding structure of the projection lamp lens.

[0032] Furthermore, the film 4 is inclined on the side facing the condenser lens assembly A and has an angle β with the main optical axis, and the angle β satisfies: 88° < β < 90°. With such a setting, the distances between different positions on the film 4 and the condenser lens assembly A will be different, thereby affecting the back focal lengths corresponding to the imaging patterns at different positions on the film 4, which can improve the imaging quality of the projection lamp lens and make the final projection pattern clearer. Preferably, β = 89°; it can reduce the reflection of light on the surface of the film 4, enabling it to achieve a better effect of improving ghosting and enhancing the imaging quality of the projection lamp lens.

[0033] Further, the maximum edge thickness ETmax and the minimum edge thickness ETmin of the anti-glare lens 8 satisfy: 2 < ETmax / ETmin < 3. With such a setting, the anti-glare lens can have an appropriate edge thickness, which can reduce the difficulty of its processing and manufacturing. At the same time, on the premise of meeting the design requirements, the durability can be improved, and the stability of the projection lamp lens can be enhanced.

[0034] Further, the anti-glare lens 8 can be set to have no optical power or have optical power. When it has optical power, its focal length fn satisfies: 2000 ≤ |fn| ≤ 3000. The lens with no optical power has low processing accuracy requirements and low cost; the lens with optical power has higher processing accuracy requirements and higher cost, but it can improve the imaging quality of the projection lamp lens and the imaging quality is better. According to the actual requirements of the projection lamp lens, the anti-glare lens 8 is selected to be set with no optical power or with optical power.

[0035] Further, both the image source surface and the projection surface of the anti-glare lens 8 are circular planes.

[0036] Further, the projection lens assembly B sequentially includes a first projection lens 5, a second projection lens 6, and a third projection lens 7 along the main optical axis direction. The first projection lens 5 has positive optical power, and both its image source surface and projection surface are convex surfaces; the second projection lens 6 has negative optical power, and both its image source surface and projection surface are concave surfaces; the third projection lens 7 has positive optical power, and both its image source surface and projection surface are convex surfaces. Through a specific combination of optical power and surface type matching, the aberration can be effectively corrected and the imaging quality can be improved.

[0037] Further, the first projection lens 5, the second projection lens 6, the third projection lens 7, and the anti-glare lens 8 are coaxially arranged. With such a setting, the light trend after passing through the film 4 can be made stable, and the imaging quality of the projection lamp lens can be improved.

[0038] Further, the materials of the first projection lens 5, the second projection lens 6, and the third projection lens 7 can be glass or plastic. When the material of the lens is plastic, the production cost can be effectively reduced. When the material of the lens is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. More specifically, the first projection lens 5, the second projection lens 6, and the third projection lens 7 are all plastic lenses, reducing the cost.

[0039] Further, the condenser lens assembly A sequentially includes a first condenser lens 2 and a second condenser lens 3 along the main optical axis direction. Among them, the optical axis of the second condenser lens 3 has an included angle γ with the main optical axis of the projection lamp lens, and the included angle γ satisfies: 3° < γ < 15°. With such a setting, the light trend can be reasonably controlled, so that the light enters each component at the rear end of the projection lamp lens evenly, improving the projection performance.

[0040] Further, the anti-glare lens 8 is made of glass, which can effectively improve the impact resistance and scratch resistance of the projection lamp lens.

[0041] Further, the film 4 has a circular structure, and both its image source surface and projection surface are flat. More specifically, the film 4 is made of glass, which can effectively improve the durability of the film.

[0042] Further, when the projection lamp lens provided by the present utility model is working, the light emitted from the image source 1 passes through the first condenser lens 2, the second condenser lens 3, the film 4, the first projection lens 5, the second projection lens 6, the third projection lens 7, and the anti-glare lens 8 in sequence and then reaches the image surface, finally forming a projection image.

[0043] The above-described embodiments only represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A projection lamp lens, characterized in that, It includes a condenser lens assembly, a film sheet with an imaging pattern, a projection lens assembly, and an anti-glare lens arranged in sequence along the main optical axis direction; Among them, the film sheet is inclined towards the side of the condenser lens assembly; The anti-glare lens includes an image source surface facing the projection lens assembly and having an angle α with the main optical axis, and a projection surface away from the projection lens assembly and perpendicular to the main optical axis; among them, the angle α satisfies: 78° < α < 82°.

2. The projection lamp lens according to claim 1, wherein The film sheet has an angle β with the main optical axis, and the angle β satisfies: 88° < β < 90°.

3. The projection lamp lens according to claim 1, wherein The maximum edge thickness ETmax and the minimum edge thickness ETmin of the anti-glare lens satisfy: 2 < ETmax / ETmin < 3.

4. The projection lamp lens according to claim 1, characterized in that, The anti-glare lens has a focal power, and its focal length fn satisfies: 2000 ≤ |fn| ≤ 3000.

5. The projection lamp lens according to claim 1, wherein Both the image source surface and the projection surface of the anti-glare lens are circular planes.

6. The projection lamp lens according to claim 1, characterized in that The projection lens assembly includes a first projection lens, a second projection lens, and a third projection lens in sequence along the main optical axis direction. The first projection lens has a positive focal power, and both its image source surface and projection surface are convex surfaces; the second projection lens has a negative focal power, and both its image source surface and projection surface are concave surfaces; the third projection lens has a positive focal power, and both its image source surface and projection surface are convex surfaces.

7. The projection lamp lens according to claim 6, characterized in that, The first projection lens, the second projection lens, the third projection lens, and the anti-glare lens are coaxial.

8. The projection lamp lens according to claim 1, wherein, The condenser lens assembly includes a first condenser lens and a second condenser lens in sequence along the main optical axis direction. Among them, the optical axis of the second condenser lens has an angle γ with the main optical axis of the projection lamp lens, and the angle γ satisfies: 3° < γ < 15°.

9. The projection lamp lens according to claim 1, characterized in that, The film sheet is a circular structure, and both its image source surface and projection surface are flat surfaces.

10. The projection lamp lens according to claim 9, characterized in that, The film sheet and the anti-glare lens are made of glass.

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