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Zoom movie lens and camera device

A zoom lens and film technology, applied in the field of lenses, can solve the problems of reducing the imaging quality of film lenses, reduce the possibility of spherical aberration, peripheral coma, and chromatic aberration, reduce the focal length from being too large or too small, and reduce the The effect of the small breathing effect

Pending Publication Date: 2020-04-03
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When shifting focus between multiple focal points, the displacement of the lens group inside the lens may slightly change the size of the field of view of the picture, which looks like a slight zoom, reducing the imaging quality of the movie lens

Method used

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  • Zoom movie lens and camera device
  • Zoom movie lens and camera device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment one: if figure 1 with figure 2 As shown, a zoom movie lens includes: a zoom lens group GA with negative refractive power, a fixed lens group GB with positive refractive power, a focusing lens group GC, and a cylindrical lens group arranged sequentially from the object side to the image side GE and compensating lens group GF with positive power.

[0053] At the time of zooming, the distance between the zoom lens group GA and the focus lens group GC, and the distance between the focus lens group GC and the cylindrical lens group GE are adjusted by the movement of the zoom lens group GA and / or the focus lens group GC. Change; that is, when zooming, the zoom lens group GA and / or the focus lens group GC move back and forth to realize the change of the focal length of the zoom movie lens.

[0054] The zoom lens group GA satisfies conditional expression (1) expressed as follows:

[0055] α*M / TTL<2 (1);

[0056] Wherein, α is the preset lens coefficient, M is th...

Embodiment 2

[0078] Embodiment two: if figure 1 with figure 2 As shown, a zoom movie lens, the difference between this embodiment and the first embodiment lies in the specific structure of the zoom lens group GA.

[0079] On the basis of Embodiment 1, in this embodiment, the zoom lens group GA at least includes a first lens group Ga1 and a second lens group Ga2 with negative refractive power, and the first lens group Ga1 is close to the object side, that is, the first lens group The group Ga1 is located on the left, the second lens group Ga2 is close to the image side, and the second lens group Ga2 is located on the right.

[0080] The zoom lens group GA satisfies conditional expression (5) expressed as follows:

[0081] -1Ga2 / φ Ga1 <1 (5);

[0082] Among them, φ Ga1 is the focal power of the first lens group Ga1, φ Ga2 is the focal power of the second lens group Ga2.

[0083] The realization of the negative refractive power of the zoom lens group GA is realized by limiting the ra...

Embodiment 3

[0088] Embodiment three: as figure 1 with figure 2 As shown, a zoom movie lens, the difference between this embodiment and the first embodiment lies in the specific structure of the focusing lens group GC.

[0089]On the basis of the first embodiment, in this embodiment, the focus lens group GC includes at least two focus lens groups; when changing magnification, the distance between the focus lens group and the fixed lens group GB, the distance between two adjacent focus lens groups The distance between the lens groups changes with the movement of the zoom lens group GA; in this embodiment, the first focusing lens group Gc1 is arranged on the side close to the object side, that is, the left side, and the second focusing lens group Gc2 is arranged on the side close to the object side. On the right side of the image side, both focusing lens groups can move independently.

[0090] Through the arrangement of multiple focusing lens groups, the focusing ability of the focusing l...

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Abstract

The invention discloses a zoom movie lens and a camera device, and relates to the technical field of lenses. The zoom movie lens comprises a zoom lens group with negative focal power, a fixed lens group with positive focal power, a focusing lens group, a cylindrical lens group and a compensation lens group with positive focal power which are sequentially arranged from an object side to an image side. During zooming, the interval between the zoom lens group and the focusing lens group and the interval between the focusing lens group and the cylindrical lens group are changed through the movement in the zoom lens group and / or the focusing lens group. The zoom lens group satisfies the following conditional expression (1) of alpha * M / TTL (2 (1), wherein alpha is a preset lens coefficient, M is the maximum moving distance of the zoom lens group, and TTL is the total optical length of the movie lens. According to the zoom movie lens, the possibility that the compensation lens group is too long or too short is reduced, the generation possibility of the spherical aberration, peripheral coma and chromatic aberration is reduced, and the imaging quality of the zoom movie lens is improved.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a zoom movie lens and an imaging device. Background technique [0002] Cine lenses, as the name suggests, are lenses for filming. Cine lenses have the highest optical quality, and the design of their mechanical structure fully takes into account the professional needs of film production. Since these lenses are specially tailored for the filming environment, they may not be suitable for other fields. Installing a follow focus gear ring and modifying a stepless aperture on a camera lens does not turn it into a cine lens. [0003] With the gradual reduction of material costs, cameras with large-size photosensitive elements continue to emerge, and an industrial structure with fewer lenses and more machines has gradually formed. Many lens manufacturers have begun to modify and whitewash camera lenses, using cine lenses or "movie-style" "The name of the lens is marketed. [0004] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/14
Inventor 张平华诸益炜
Owner JIAXING ZHONGRUN OPTICAL TECH
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