Zoom lens and Image intake device using same

A technology for image capture and zoom lens, which can be used in image communication, components of color TV, components of TV systems, etc., and can solve problems such as structural limitations

Inactive Publication Date: 2007-09-12
BENQ CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in order to achieve optimal imaging effects, for example, the three-lens group in a general digital camera often uses about ten lenses, resulting in certain restrictions and burdens on the structure or cost.

Method used

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  • Zoom lens and Image intake device using same
  • Zoom lens and Image intake device using same
  • Zoom lens and Image intake device using same

Examples

Experimental program
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Embodiment Construction

[0047] Please refer to FIG. 1 , which shows a partial structural diagram of an image capturing device according to a preferred embodiment of the present invention. The image capture device 100 is, for example, a digital camera, and includes a sensor component 110 and a zoom lens 120 . The sensing element 110 is, for example, a Charge Coupling Device (CCD), a Complementary Metal-Oxide Semiconductor (CMOS), or any photosensor capable of sensing light brightness, for converting the received light signal converted into electrical signals. The zoom lens 120 has an effective focal length of fw in a wide angle mode and includes a first lens group 121 , a second lens group 125 and a third lens group 128 .

[0048] The first lens group 121 has a negative effective power, and the effective focal length of the first lens group 121 is f1, 2.1<|f1 / fw|<2.6. The first lens group includes a first lens 122 and a second lens 123, the first lens 122 has a first negative refractive power (negat...

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Abstract

A zoom lens, of which effective focal length is fw being about wide angle mode. And the invention has first battery of lens, second battery of lens and third battery of lens from image side by order. First battery of lens has negative effective power, of which effective focal length is f1. 2.1<|f1/fw|<2.6. First battery of lens includes first lens and second lens. First battery of lens has first negative power and at least first aspheric concave mirror surface. Second lens has first positive power. Second battery of lens has first positive effective power, of which effective focal length is f2. 1.5<|f2/fw|<1.8. Second battery of lens includes third lens and fourth lens. Third lens has second positive power and at least a second aspheric mirror surface. Fourth lens has third positive power. Third battery of lens has second positive effective power.

Description

technical field [0001] The present invention relates to a zoom lens and an image capturing device using the same, and in particular to a zoom lens with less than six lenses and a short back focus and an image capturing device using the same. Background technique [0002] Traditionally, zoom lenses applied to cameras mostly adopt a structure with three lens groups. Moreover, with the maturity of technology and market demand, the design trend of camera size is becoming thinner and shorter. The design key is mainly to shorten the Back Focal Length (BFL) of the zoom lens and reduce the number of lenses used in the three-lens group. [0003] In addition, the effective focal length ratio between the telephoto mode and the wide angle mode, that is, the zoom ratio, is also one of the evaluation criteria for the imaging capability. In terms of current digital cameras, at least all have a zoom ratio of about 3 times. [0004] However, in order to achieve optimal imaging effects, for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B9/12H04N5/225
Inventor 林明坤
Owner BENQ CORP
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