A zoom lens and a camera

A zoom lens and lens technology, used in image communication, television, optics, etc., can solve the problem of increasing the height of the light, and achieve the effect of good aberration correction and good back focus

Inactive Publication Date: 2010-03-17
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this structure, the ray height of the light incident on the central positive lens becomes large due to the negative lens on the most object side of the fourth lens group, which is disadvantageous in terms of aberration correction.

Method used

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  • A zoom lens and a camera
  • A zoom lens and a camera
  • A zoom lens and a camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0092] Next, numerical examples of the zoom lens of the present invention will be described. exist Figure 1 to Figure 8 Lens cross-sectional views of the zoom lenses of Examples 1 to 8 are shown, respectively.

[0093] Table 1 shows the basic lens data of the zoom lens according to Example 1, Table 2 shows the data related to zooming (magnification), and Table 3 shows the aspheric surface data. Similarly, Tables 4 to 24 show basic data, data related to zooming, and aspheric surface data of the zoom lenses according to Examples 2 to 8. Hereinafter, the meanings of the symbols in the tables will be described by taking Example 1 as an example, but the same applies to Examples 2 to 8.

[0094] In the basic lens data in Table 1, Si represents the i-th (i=1, 2, 3, ...) surface that increases sequentially toward the image side, with the surface of the constituent element closest to the object side as the first surface number, Ri represents the radius of curvature of the i-th surf...

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PUM

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Abstract

The invention provides a zoom lens, which comprises four lens assemblies from a first lens assembly (G1) to a forth lens assembly (G4). The first lens assembly (G1) and the third lens assembly (G3) are fixed, and the second lens assembly (G2) is moved when zooms in or out, and the forth lens assembly (G4) is moved to correct image plane position of the zoom and focus. The third lens assembly (G3)is composed of a positive lens with at least one aspheric surface. The forth lens assembly (G4) is composed of a positive lens, a negative lens and three lens of the positive lens from object side inseries. Set focal distance of the third lens assembly (G3) to be f3, and focal distance of the entire system in a wide-angle end to be fw to satisfy the following conditional expression (1): 12<f31 / fw<20 (1). Thereby, miniaturization can be tried and long back focal length and favorable optical performance can be realized.

Description

technical field [0001] The present invention relates to a zoom lens and an imaging device. In more detail, it relates to a zoom lens that can be suitably used in a video camera, an electronic still camera, a surveillance camera, etc., and is particularly suitable for use as a 3CCD type electronic camera, and a device equipped with the zoom lens. camera device. Background technique [0002] Conventionally, four-group or five-group zoom lenses have been proposed as zoom lenses for consumer video cameras and the like. For example, Patent Documents 1 and 2 disclose a four-unit zoom lens having a high zoom ratio of about 10 times and an F value (F value) of about 1.8. More specifically, the zoom lens described in Patent Document 1 has a three-element structure for the first lens group, three lens groups for the second lens group, two-element structure for the third lens group, and three-element structure for the fourth lens group. The zoom lens described in Patent Document 2 is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B1/04H04N5/225
Inventor 河村大树
Owner FUJI PHOTO OPTICAL CO LTD
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