一种长后截距全画幅相机镜头

Abstract

本实用新型公开了一种长后截距全画幅相机镜头，属于相机镜头技术领域，从物方到成像面依次包括第一透镜、第二透镜、第三透镜、第四透镜、可变光阑、第五透镜、第六透镜、第七透镜、第八透镜、第九透镜、第十透镜、第十一透镜；其中，所述第一透镜、第二透镜、第三透镜、第四透镜构成第一透镜群，作为固定组，光焦度为正；其中，所述第五透镜与第六透镜构成第二透镜群，作为移动组，光焦度为负；其中，所述第七透镜、第八透镜、第九透镜、第十透镜、第十一透镜构成第三透镜群，作为固定组，光焦度为正。本实用新型优化光焦度分配（三群组结构：正‑负‑正）与胶合透镜组设计（三组双胶合），有效降低公差容纳度。

Claims

1. A long back-irradiance full-frame camera lens characterized by: From the object plane to the imaging plane, the lenses are arranged in sequence as follows: first lens (1), second lens (2), third lens (3), fourth lens (4), variable aperture STP, fifth lens (5), sixth lens (6), seventh lens (7), eighth lens (8), ninth lens (9), tenth lens (10), and eleventh lens (11). Among them, the first lens (1), the second lens (2), the third lens (3), and the fourth lens (4) constitute the first lens group G1, which is a fixed group with positive optical power; The fifth lens (5) and the sixth lens (6) together form the second lens group G2, which is a moving group with negative optical power. Among them, the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10), and the eleventh lens (11) constitute the third lens group G3, which is a fixed group with positive optical power.

2. A long back-throw full-frame camera lens according to claim 1, characterized in that: The second lens (2) and the third lens (3) are combined to form the first cemented lens group; the first lens (1) and the fourth lens (4) both have positive optical power.

3. A long back-throw full-frame camera lens according to claim 1, characterized in that: The fifth lens (5) is a concave object-side positive lens with positive optical power, and the sixth lens (6) is a biconcave negative lens with negative optical power.

4. A long back-throw full-frame camera lens according to claim 1, characterized in that: The seventh lens (7) and the eighth lens (8) are combined to form the second cemented lens group; the ninth lens (9) and the tenth lens (10) are combined to form the third cemented lens group; and the eleventh lens (11) has negative optical power.

5. A long back-throw full-frame camera lens according to claim 1, characterized in that: The back focal length of the lens satisfies the following condition: BF / Ymax > 1.5 Where BF is the distance from the vertex of the last lens of the optical system to the image plane at infinity, and Ymax is the maximum paraxial image height at infinity.

6. A long back-throw full-frame camera lens according to claim 2, characterized in that: The first lens (1) is a spherical positive lens convex to the object side, which satisfies the following conditions: F1 / Ymax < 6, PgF1+0.0017vd1 > 0.67; in, F1: Focal length of the first lens; Ymax: Maximum paraxial image height at infinity; PgF1: Partial dispersion of the first lens with respect to the g-line and the F-line; vd1: Abbe number of the first lens.

7. A long back-throw full-frame camera lens according to claim 2, characterized in that: The second lens (2) and the third lens (3) satisfy the following conditions: vd2 > 70, 1.6 < |F2 / F3| < 1.3; in, vd2: Abbe number of the second lens; F2: Focal length of the second lens; F3: Focal length of the third lens.

8. A long back focal length full-frame camera lens according to claim 2, characterized in that: The last lens in the first lens group G1 is the fourth lens (4), which is a spherical positive lens convex to the object side and satisfies the following conditions: 0.8 < F4 / f < 1.2 Where F4 is the focal length of the last lens in the first lens group G1, and f is the focal length of the optical system.

9. A long back-throw full-frame camera lens according to claim 3, characterized in that: The second lens group G2 moves towards the image side to achieve focusing from infinity to near distance, satisfying the following conditions: PgF5+0.0017vd5 > 0.67, 0.5 < |FG2 / f| < 0.7; in, PgF5: Partial dispersion of the positive lens in the second lens group G2 about the g-line and the F-line; vd2: Abbe number of the positive lens in the second lens group G2; FG2: Focal length of the second lens group G2; f: Focal length of the optical system.

10. A long back-throw full-frame camera lens according to claim 4, characterized in that: The lenses in the third lens group G3 satisfy the following conditions: PgFP + 0.0017vdP < 0.64 ndN < 1.66; in, PgFP: Partial dispersion of the positive lens in the third lens group G3 about the g-line and the F-line; vdP: Abbe number of the positive lens in the third lens group G3; ndN: The refractive index of the negative lens in the third lens group G3; The last lens in the third lens group G3 is the eleventh lens (11), which is a meniscus negative lens that curves towards the object side and satisfies the following conditions: F11 / f > 2.66; Where F11 is the focal length of the last lens, and f is the focal length of the optical system.

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