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Zoom lens system

A zoom lens and lens technology, applied in the field of zoom lens systems, can solve the problem that the zoom lens cannot meet the wide-angle end state, wide viewing angle and high zoom ratio, etc.

Inactive Publication Date: 2008-03-12
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the zoom lenses proposed in these patent documents cannot satisfy the wide viewing angle and high zoom ratio in the wide-angle end state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0104] 1 is a diagram showing the lens composition of the zoom lens system according to Example 1 of the present invention at the wide-angle end state (W), the medium focal length state (M) and the telephoto end state (T) and the movement of the lens group during zooming.

[0105] As shown in FIG. 1 , the zoom lens system according to Example 1 includes, from the object side: a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, a second lens group G2 having negative refractive power, The third lens group G3 with positive refractive power and the fourth lens group G4 with positive refractive power. When the position state of the lens groups changes from the wide-angle end state to the telephoto end state, each lens group moves so that the distance between the first lens group G1 and the second lens group G2 decreases, and the second lens group G2 The distance between the third lens group G3 and the third lens group G3 ...

example 2

[0204] Fig. 3 is a diagram showing a lens configuration of a zoom lens system according to Example 2 of the present invention. Incidentally, the drawings showing the lens structure of each of the following examples show only the case of the wide-angle end state (W).

[0205] In the zoom lens system according to Example 2, the third negative lens SL1 from the object side of the first lens group G1 and the second and third positive lenses SL2 and SL3 from the object side of the fourth lens group G4 are made of special glass production. The negative lens SL1 made of special glass has a biconcave shape.

[0206] In the zoom lens system according to Example 2, focusing from infinity to a close object is performed by integrally moving the first lens from the object side of the second lens group G2 and one cemented lens along the optical axis on the image side, wherein The above-mentioned cemented lens is formed by cementing the second lens from the object side of the second lens g...

example 3

[0293] Fig. 5 is a diagram showing a lens configuration of a zoom lens system according to Example 3 of the present invention.

[0294] In the zoom lens system according to Example 3, the third negative lens SL1 from the object side of the first lens group G1 and the first positive lens SL2 and the third positive lens SL3 from the object side of the fourth lens group G4 are made of special glass production. The negative lens SL1 made of special glass has a biconcave shape, and is cemented with the fourth lens counted from the object side.

[0295] In the zoom lens system according to Example 3, one cemented lens formed by cementing the first lens from the object side of the second lens group G2 with the second lens by integrally moving the image side along the optical axis and the second lens group The third lens from the object side of the G2 is cemented with the fourth lens to perform focusing from infinity to close objects.

[0296] The various values ​​of the zoom lens s...

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Abstract

A super-wide zoom lens system having sufficient zoom ratio and a high speed, capable of obtaining high optical performance. The system includes at least, in order from an object, a first lens group G1 having negative refractive power, and a second lens group G2 having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 varies. The first lens group G1 includes at least one negative lens element and a glass material constructing at least one negative lens element in the first group G1 satisfies given conditions.

Description

technical field [0001] The present invention relates to a zoom lens system, and more particularly to a zoom lens system suitable for a single-lens reflex camera having a viewing angle of 75° or more and a zoom ratio of not less than 3 at the wide-angle end state. Background technique [0002] A zoom lens system having a negative lens group on the closest object side (so-called negative lead type zoom lens) is easily made as a wide-angle lens and has been variously conceived. On the other hand, negative lead type zoom lenses have a disadvantage that it is difficult to satisfy high zoom ratios and high speeds. Therefore, high-speed zoom lenses overcoming this disadvantage have been proposed, for example, in Japanese Laid-Open Patent Applications JP2000-241704 and 2000-221399. [0003] However, the zoom lenses proposed in these patent documents cannot satisfy a wide viewing angle and a high zoom ratio in the wide-angle end state. Contents of the invention [0004] The prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/20G02B13/18
Inventor 泉水隆之
Owner NIKON CORP
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