High-resolution LCD projection lens

By adopting the four-piece lens structure and aperture design, the existing LCD projection lens has solved the problems of high cost and complex structure, and the lens with high resolution, large aperture and compact structure is realized, reducing the cost and suitable for LCD projection equipment.

CN222913955UActive Publication Date: 2025-05-27EAST ASIA OPTICS (XINYANG) CO LTD
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Patent Information

Application Number
CN202420379409.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-02-29
Publication Date
2025-05-27
Estimated Expiration
2034-02-28

AI Technical Summary

Technical Problem

While ensuring high resolution and brightness, the cost is difficult to effectively control, and the lens structure is complex, making it difficult to achieve both miniaturization and large aperture.

Method used

Using a four-piece lens structure, including two positive lenses, one negative lens and one Fresnel lens, the optical system is optimized through the setting of the aperture, reducing the number and complexity of the lens, and improving the compactness and cost-effectiveness of the lens.

Benefits of technology

It realizes a high-resolved image, large aperture, and compact LCD projection lens, while effectively reducing costs, is suitable for LCD projection equipment, and can effectively correct aberrations in optical systems under high and low temperature conditions.

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Abstract

The utility model discloses a high resolution LCD projection lens, which comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side, a diaphragm is arranged between the second lens and the third lens, the first lens and the third lens are both positive lenses with positive focal power, and the fourth lens is a positive lens with negative focal power. The second lens is a negative lens with negative focal power, the distance between the fourth lens and the LCD is L, and L is larger than 8 and smaller than 12. According to the utility model, a four-lens structure is adopted, the first lens L1, the second lens L2 and the third lens L3 are all plastic aspheric lenses, and the fourth lens L4 is a plastic aspheric Fresnel lens, so that the obtained LCD projection lens has the advantages of high resolution, large aperture, compact structure and high and low temperature, aberration in an optical system can be effectively corrected, and meanwhile, the optical quality is improved. And compared with an LCD projection lens in the prior art, the LCD projection lens is lower in cost and can be suitable for LCD projection equipment.
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Claims

1. A high-resolution LCD projection lens, characterized in that: The invention comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from the object side to the image side, an aperture is arranged between the second lens and the third lens, the first lens and the third lens are positive lenses with positive focal length, the second lens is a negative lens with negative focal length, the first lens L1, the second lens L2 and the third lens L3 are plastic aspherical lenses, the fourth lens L4 is a plastic aspherical Fresnel lens, the distance between the fourth lens and the LCD is L, 8mm<L<12mm.

2. The high-resolution LCD projection lens according to claim 1, wherein: The first lens has a convex surface on one side close to the object side, and the other side of the first lens is a concave surface; the second lens has a concave surface on one side close to the first lens, and the other side of the second lens is a convex surface; the third lens has a convex surface on one side close to the second lens, and the other side of the third lens is a concave surface.

3. The high-resolution LCD projection lens according to claim 1, wherein: The lens aperture Fno. formed by the first lens, the second lens, the aperture, the third lens and the fourth lens is less than 2.

7.

4. The high-resolution LCD projection lens according to claim 1 or 3, characterized in that: The distance from the rear vertex of the lens consisting of the first lens, the second lens, the aperture, the third lens and the fourth lens to the fourth lens is S, and S>61mm.

5. The high-resolution LCD projection lens according to claim 1, wherein: The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the lens optical system composed of the first lens, the second lens, the aperture, the third lens and the fourth lens is f; 1.1<|f1 / f|<1.2, 0.95<|f2 / f3|<1.

05.

6. The high-resolution LCD projection lens according to claim 1, wherein: The transmittance of the lens composed of the first lens, the second lens, the aperture, the third lens and the fourth lens is TR, 1.2<|TR|<1.35.