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Rear-focusing type zoom lens and imaging apparatus

A zoom lens and lens technology, which is applied in the field of zoom lenses, can solve problems such as difficult high magnification, magnification chromatic aberration or distortion, etc., and achieve the effects of correcting various aberrations, super wide-angle and high magnification

Inactive Publication Date: 2009-04-15
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In rear focus type zoom lenses, problems associated with ultra-wide-angle expansion include deterioration of chromatic aberration of magnification and distortion, increase in aberration fluctuations due to magnification, difficulty in increasing magnification, and enlargement of the diameter of the first group Wait

Method used

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  • Rear-focusing type zoom lens and imaging apparatus
  • Rear-focusing type zoom lens and imaging apparatus
  • Rear-focusing type zoom lens and imaging apparatus

Examples

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Embodiment Construction

[0066] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0067] FIG. 1 shows a first configuration example of a rear focus type zoom lens according to an embodiment of the present invention. This configuration example corresponds to the first numerical example described later ( Figure 4 , Figure 5 (A) to (C)) lens configuration. Fig. 2 shows the 2nd configuration example, corresponding to the 2nd numerical value embodiment described later ( Image 6 , Figure 7 (A) to (C)) lens configuration. Fig. 3 shows the 3rd configuration example, corresponding to the 3rd numerical value embodiment described later ( Figure 8 , Figure 9 (A) to (C)) lens configuration. In addition, FIGS. 1 to 3 show lens arrangements in a state where an object at infinity is focused on at the wide-angle end. In FIGS. 1 to 3 , symbol R1 represents the surface of the i-th surface whose number increases sequentially toward the image side ...

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Abstract

The invention provides a rear-focusing type zoom lens which ensures long enough rear intercept, well corrects various aberration and combines wide angle and high magnification. The rear-focusing type zoom lens includes, in order from an object side, a positive first group (G1) being fixed, a negative second group (G2) moving toward an image plane along an optical axis during zooming from a wide-angle end to a telephoto end; a negative third group (G3) being fixed in an optical axis direction, and a positive fourth group (G4) moving along the optical axis direction to correct image plane variation being caused by zooming. The first group includes a first subgroup having a negative power as a whole and a second subgroup having a positive power as a whole. The first group (G1) is composed of an eleventh group (G1A) having negative focal power on the whole and a 12-th group (G1B) having positive focal power on the whole. The eleventh group (G1A) comprises a negative meniscus lens (G11), a negative lens (G12), a positive lens (G13) and a negative lens (G14) with a convex side facing the object side.

Description

technical field [0001] The present invention relates to a zoom lens suitable for a television camera or a video camera that supports HD image quality, and more particularly to a rear focus type zoom lens that focuses by moving a lens group closer to the image side than the first group, and a zoom lens equipped with Camera device with focus zoom lens. Background technique [0002] Conventionally, among the zoom lenses, there is known a rear focus type zoom lens that focuses by moving a lens group closer to the image side than the first group. In the post-focus method, compared with the method of moving the first group to focus, the effective diameter of the first group can be reduced, and the light-weight group can be moved to focus, thereby enabling rapid focusing. Patent Document 1 and Patent Document 2 disclose that a positive first group, a negative second group, a positive third group, and a negative fourth group are provided sequentially from the object side, and the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B15/163G02B15/167G02B9/34G02B13/18H04N5/225
CPCG02B15/17G02B27/646G02B15/145109G02B15/145125
Inventor 池田伸吉
Owner FUJI PHOTO OPTICAL CO LTD