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CN-121978821-A - Ultra-short focal projection lens and projection equipment

CN121978821ACN 121978821 ACN121978821 ACN 121978821ACN-121978821-A

Abstract

The invention provides an ultra-short focal projection lens and projection equipment, which are based on the technical field of optical imaging, wherein the ultra-short focal projection lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with negative focal power, an eleventh lens with positive focal power, a twelfth lens with positive focal power, a thirteenth lens with positive focal power, a fourteenth lens with negative focal power, a fifteenth lens with negative focal power, a sixteenth lens with negative focal power and a concave reflector, so that the total optical length of the ultra-short focal projection lens is controlled within 300mm, and the definition is 8K and above. The scheme realizes the ultra-short focal projection lens with small volume, high resolution and good athermalization.

Inventors

  • ZHANG LIJUAN
  • QUAN LIWEI
  • RAO QINHE
  • GONG JUNQIANG

Assignees

  • 中山联合光电显示技术有限公司

Dates

Publication Date
20260505
Application Date
20260317

Claims (10)

  1. 1. An ultra-short focal projection lens, characterized in that the ultra-short focal projection lens has an object side and an image side which are oppositely arranged along an optical axis direction, the ultra-short focal projection lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with negative focal power, an eleventh lens with positive focal power, a twelfth lens with positive focal power, a thirteenth lens with positive focal power, a fourteenth lens with negative focal power, a fifteenth lens with negative focal power, a sixteenth lens with negative focal power and a concave reflector which are sequentially arranged from the object side to the image side, so that the total optical length of the ultra-short focal projection lens is controlled within 300mm, and the optical total length of 8K and more can be achieved; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens are glass lenses, and the fifteenth lens and the sixteenth lens are plastic lenses.
  2. 2. The ultra-short focal projection lens of claim 1 further comprising a stop disposed between the eighth lens and the ninth lens.
  3. 3. The ultra-short focal projection lens of claim 1 wherein the second, ninth, fifteenth and sixteenth lenses are aspheric lenses and the first, third, fourth, fifth, sixth, seventh, eighth, tenth, eleventh, twelfth, thirteenth and fourteenth lenses are spherical lenses.
  4. 4. The ultra-short focal projection lens of claim 1 wherein the fourth lens, fifth lens and sixth lens are in cemented connection and the seventh lens is in cemented connection with the eighth lens.
  5. 5. The ultra-short focal projection lens of claim 1, wherein the first lens is a meniscus lens with a convex object-side surface; The second lens is a biconvex lens; the third lens is a concave-convex lens, and the object side surface of the third lens is a concave surface; The fourth lens is a biconvex lens; the fifth lens is a biconcave lens; the sixth lens is a biconvex lens; The seventh lens is a biconcave lens; The eighth lens is a biconvex lens; The ninth lens is a concave-convex lens, and the object side surface of the ninth lens is a concave surface; the tenth lens is a biconcave lens; the eleventh lens is a concave-convex lens, and the object side surface of the eleventh lens is a convex surface; the twelfth lens is a biconvex lens; The thirteenth lens is a biconvex lens; The fourteenth lens is a biconcave lens; the fifteenth lens is a biconcave lens; The sixteenth lens is a concave-convex lens, and the object side surface of the sixteenth lens is a convex surface.
  6. 6. The ultra-short focal projection lens of claim 5, 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, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is 7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the eleventh lens is f11, the focal length of the twelfth lens is f12, the focal length of the thirteenth lens is f13, the focal length of the fourteenth lens is f14, the focal length of the fifteenth lens is f15, and the focal length of the sixteenth lens is f16, wherein: 20＜f1＜100,20＜f2＜100,200＜f3＜400,20＜f4＜100,-100＜f5＜-5,10＜f6＜100,-100＜f7＜-5,10＜f8＜100,10＜f9＜100,-100＜f10＜-5,100＜f11＜200,20＜f12＜100,20＜f13＜100,-100＜f14＜-5,-100＜f15＜-5,-200＜f16＜-100.
  7. 7. The ultra-short focal projection lens of claim 5, wherein the first lens has a refractive index of n1, an abbe number of v1, the second lens has a refractive index of n2, an abbe number of v2, the third lens has a refractive index of n3, an abbe number of v3, the fourth lens has a Jiao Sheshe index of n4, an abbe number of v4, the fifth lens has a refractive index of n5, an abbe number of v5, a refractive index of n6, an abbe number of v6, a refractive index of n7, an abbe number of v7, a refractive index of n8, an abbe number of v8, a refractive index of n9, an abbe number of v9, a refractive index of n10, an abbe number of v10, a refractive index of n11, an abbe number of v11, a refractive index of n12, an abbe number of n12, a refractive index of n12, an abbe number of v13, a refractive index of n14, a refractive index of n13, a refractive index of n15, a refractive index of n14, a refractive index of n13, a refractive index of n12, a refractive index of n9 and a refractive index of n 9. 1.70≤n1≤2.10,1.40≤n2≤1.70,1.40≤n3≤1.70,1.40≤n4≤1.70,1.70≤n5≤2.10,1.50≤n6≤1.80,1.60≤n7≤2.00,1.60≤n8≤1.90,1.65≤n9≤1.80,1.50≤n10≤1.90,1.60≤n11≤2.00,1.50≤n12≤1.80,1.50≤n13≤1.70,1.65≤n14≤1.85,1.50≤n15≤1.70,1.40≤n16≤1.70,20.0≤v1≤40.0,50.0≤v2≤90.0,50.0≤v3≤90.0,50.0≤v4≤90.0,20.0≤v5≤40.0,30.0≤v6≤70.0,20.0≤v7≤40.0,25.0≤v8≤50.0,30.0≤v9≤55.0,20.0≤v10≤40.0,30.0≤v11≤70.0,20.0≤v12≤40.0,25.0≤v13≤50.0,20.0≤v14≤55.0,50.0≤v15≤70.0,50.0≤v16≤70.0.
  8. 8. The ultra-short focal projection lens of claim 1, wherein the optical total length of the ultra-short focal projection lens is TTL and the effective focal length of the ultra-short focal projection lens is EFL, wherein: TTL/EFL≤48。
  9. 9. The ultra-short focal projection lens of claim 1 wherein the sixteenth lens has a diameter D16 and the image plane of the ultra-short focal projection lens has a diameter IC, wherein: D1<75mm,IC≤36.6mm。
  10. 10. Projection device, characterized by comprising an ultra short focus projection lens according to any of claims 1 to 9.

Description

Ultra-short focal projection lens and projection equipment Technical Field The invention relates to the technical field of optical imaging, in particular to an ultra-short-focus projection lens and projection equipment. Background With the rapid popularization of 8K ultra-high definition display technology and the continuous expansion of home projection markets, the ultra-short focal projection technology has become a core solution of space-sensitive application scenes such as smart home and vehicle-mounted display due to the unique advantage of being capable of projecting a hundred-inch large screen within a limited distance. However, the existing ultra-short focal projection lens generally has the problems that the volume is small, the resolution is high and the temperature adaptability is high, for example, in order to reduce the volume, the use quantity of lenses is reduced, so that part of resolution is sacrificed, the requirement of high resolution cannot be met, more plastic aspheric lenses are used for the lens, the thermal adaptability is poor, and the lens is easy to lose focus under the condition of extreme temperature. Disclosure of Invention The invention mainly aims to provide an ultra-short-focus projection lens and projection equipment, and aims to provide an ultra-short-focus projection lens which is small in size, high in resolution and good in athermalization. In order to achieve the above object, the present invention proposes an ultra-short focal projection lens having an object side and an image side which are disposed opposite to each other in an optical axis direction, the ultra-short focal projection lens including a first lens having positive optical power, a second lens having positive optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having positive optical power, a seventh lens having negative optical power, an eighth lens having positive optical power, a ninth lens having negative optical power, a tenth lens having negative optical power, an eleventh lens having positive optical power, a twelfth lens having positive optical power, a thirteenth lens having positive optical power, a fourteenth lens having negative optical power, a fifteenth lens having negative optical power, a sixteenth lens having negative optical power, and a concave mirror which are disposed in this order from the object side to the image side, so that an optical total length of the ultra-short projection lens is controlled within 300mm, and a sharpness of 8K or more is achieved; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens are glass lenses, and the fifteenth lens and the sixteenth lens are plastic lenses. In an embodiment, the ultra-short focal projection lens further includes a diaphragm disposed between the eighth lens and the ninth lens. In an embodiment, the second, ninth, fifteenth and sixteenth lenses are aspheric lenses, and the first, third, fourth, fifth, sixth, seventh, eighth, tenth, eleventh, twelfth, thirteenth and fourteenth lenses are spherical lenses. In an embodiment, the fourth lens, the fifth lens and the sixth lens are cemented, and the seventh lens is cemented with the eighth lens. In an embodiment, the first lens is a concave-convex lens, and an object side surface of the first lens is a convex surface; The second lens is a biconvex lens; the third lens is a concave-convex lens, and the object side surface of the third lens is a concave surface; The fourth lens is a biconvex lens; the fifth lens is a biconcave lens; the sixth lens is a biconvex lens; The seventh lens is a biconcave lens; The eighth lens is a biconvex lens; The ninth lens is a concave-convex lens, and the object side surface of the ninth lens is a concave surface; the tenth lens is a biconcave lens; the eleventh lens is a concave-convex lens, and the object side surface of the eleventh lens is a convex surface; the twelfth lens is a biconvex lens; The thirteenth lens is a biconvex lens; The fourteenth lens is a biconcave lens; the fifteenth lens is a biconcave lens; The sixteenth lens is a concave-convex lens, and the object side surface of the sixteenth lens is a convex surface. In an embodiment, 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, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is 7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the eleventh lens is f11, the focal length of the twelfth lens is f12, the focal l