Zoom lens and an imaging apparatus

A zoom lens and imaging device technology, which is applied in the field of zoom lenses, can solve problems such as greater impact on focusing performance, difficulty in miniaturizing the lens, and difficulty in meeting high-resolution requirements, so as to suppress the increase in eccentricity sensitivity and simplify assembly , Improve the effect of positioning accuracy

Inactive Publication Date: 2004-12-01
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, because it is difficult to miniaturize the lens, it is difficult to obtain a 5-megapixel zoom lens using these conventional technologies. In addition, it is difficult to meet the demand for high resolution while miniaturizing the image size of the imaging device.
Also, due to the pursuit of miniaturization and high resolution of lenses, it is difficult to improve reliability because decentering between lens elements of the second lens group has a greater influence on focusing performance

Method used

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  • Zoom lens and an imaging apparatus
  • Zoom lens and an imaging apparatus

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Embodiment Construction

[0022] The preferred embodiments of the present invention will be described in detail below based on the accompanying drawings. FIG. 1 is a schematic diagram illustrating an embodiment of the zoom lens of the present invention. This zoom lens is mainly used in imaging devices such as digital cameras. First, the zoom lens of the present embodiment is described.

[0023] The zoom lens of this embodiment includes in order from the object side: a first lens group G1 having negative refractive power, which can move back and forth along the optical axis when the zoom ratio is changed; a second lens group G2 having positive refractive power, which can move back and forth along the optical axis when zooming It can move toward the object side along the optical axis when the ratio is changed from the wide-angle end to the telephoto end; and the third lens group G3 having a positive refractive power can move back and forth along the optical axis.

[0024] In the set of zoom lenses of t...

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Abstract

A zoom lens is disclosed to comprise sequentially from an object side, a first lens group having an negative refracting power, and being movable back and forth along with an optical axis when a zooming rate is changed, a second lens group having a positive refracting power, and being movable to the object side along with the optical axis when the zooming rate is changed from a wide-end to a tele-end; and a third lens group movable back and forth along with the optical axis, and having a positive refracting power. In such zoom lens, the second lens group includes sequentially from the object side, an iris, one piece of convergent lens where at least a surface facing to the object side is an aspherical surface and an adhered three pieces of lenses.

Description

[0001] Related Application Cross Reference [0002] This application claims priority from Japanese Priority Document No. 2003-123088 filed with the Japan Patent Office on April 28, 2003, which is incorporated herein by reference. technical field [0003] The present invention relates to a zoom lens and an imaging device, in particular to a zoom lens, the lens has a brightness (brightness) of about 2.8 F number, a zoom ratio of about 3 times, and a shorter overall length when retracted, suitable for digital cameras and video cameras etc., and an imaging device using such a zoom lens. Background technique [0004] In recent years, video cameras and digital still cameras employing solid-state image sensing devices have spread rapidly and widely, and such devices are particularly required to have high resolution and further miniaturization. Patent Document 1 and Patent Document 2 disclose zoom lenses of conventional technology, which have a zoom lens structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20G02B13/18G02B15/14G02B15/177
CPCG02B15/177G02B15/143507G02B13/009G02B3/04G02B3/0062G02B3/0087G03B17/12G02B2003/0093H04N23/55
Inventor 安达宣幸
Owner SONY CORP
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