Zoom lens system, image-capturing device, and camera

A zoom lens and lens technology, applied in the field of cameras, can solve the problems of inability to shorten the total length of the lens, the total length of the lens, and the number of lenses, and achieve the effect of the total length of the lens, the number of lenses, and the high resolution.

Inactive Publication Date: 2012-07-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the zoom lenses or variable power optical systems disclosed in the above-mentioned patent documents can meet the requirements for digital cameras in recent years. Although some of them have a small number of lenses and a short total lens length, the zoom ratio is low. As low as less than 3 times, on the contrary, although some have a higher zoom ratio, the number of lenses that constitute the lens system is large, so that the total length of the lens cannot be shortened

Method used

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  • Zoom lens system, image-capturing device, and camera
  • Zoom lens system, image-capturing device, and camera
  • Zoom lens system, image-capturing device, and camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1～6

[0116] figure 1 , 4 , 7, 10, 13, and 16 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1 to 6.

[0117] figure 1 , 4, 7, 10, 13 and 16 all represent the zoom lens system in the infinity focus state. In each figure, the figure (a) shows the wide-angle end (the shortest focal length state: focal length f W ) of the lens structure, (b) diagram represents the intermediate position (intermediate focal length state: focal length ), and (c) shows the telephoto end (longest focal length state: focal length f T ) of the lens structure. In addition, in each figure, the broken line arrows provided between (a) and (b) are obtained by sequentially connecting the positions of the lens groups in each state of the wide-angle end, the intermediate position, and the telephoto end from top to bottom. the straight line. Therefore, the wide-angle end and the middle position and the middle position and the telephoto end are simply connected by a straight li...

Embodiment approach 7

[0226] Figure 19 It is a schematic block diagram of the digital still camera which concerns on Embodiment 7. Figure 19 Among them, the digital still camera includes an imaging device including a zoom lens system 1 and an imaging element 2 of a CCD, a liquid crystal display 3 , and a casing 4 . As the zoom lens system 1, the zoom lens system according to Embodiment 1 is used. Figure 19 Among them, the zoom lens system 1 includes a first lens group G1, a second lens group G2, a third lens group G3, an aperture stop A, a fourth lens group G4, and a fifth lens group G5. The zoom lens system 1 is arranged on the front side of the casing 4 , and the imaging element 2 is arranged on the rear side of the zoom lens system 1 . The liquid crystal display 3 is arranged on the rear side of the casing 4 , and the optical image of the subject formed by the zoom lens system 1 is formed on the image plane S. As shown in FIG.

[0227] As described above, by using the zoom lens system acco...

Embodiment 1

[0242] The zoom lens system of Numerical Example 1 and figure 1 The illustrated embodiment 1 corresponds. Table 1 shows surface data of the zoom lens system of Numerical Example 1; Table 2 shows aspheric surface data; and Table 3 shows various data.

[0243] surface data

[0244]

[0245]

[0246] Table 2 (aspheric data)

[0247] side 5

[0248] K=0.00000E+00, A4=-9.10248E-05, A6=3.01897E-06, A8=-2.03901E-07A10=5.12339E-09, A12=0.00000E+00

[0249] side 6

[0250] K=0.00000E+00, A4=2.99214E-05, A6=2.73934E-06, A8=-1.72113E-07A10=4.79494E-09, A12=0.00000E+00

[0251] side 12

[0252] K=-8.66353E-01, A4=1.11174E-05, A6=-3.55647E-05, A8=7.95030E-06A10=-8.26197E-07, A12=3.09544E-08

[0253] side 17

[0254] K=0.00000E+00, A4=-1.94974E-03, A6=1.32414E-04, A8=-1.10073E-05A10=3.18781E-07, A12=0.00000E+00

[0255] side 18

[0256] K=0.00000E+00, A4=-1.14750E-04, A6=2.31259E-04, A8=-1.31423E-05A10=6.93486E-07, A12=0.00000E+00

[0257] side 21

[0258] K=0.00000E+00, A...

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Abstract

Provided are a zoom lens system, an image-capturing device, and a camera. The zoom lens system comprises lens groups at least including, in sequence from the object side to the image side, a first lens group having positive power, a second lens group having negative power, and a third lens group having positive power. Any one of the lens groups includes a lens element having a reflective surface which bends the light rays coming from the object. The first lens group and the third lens group do not move along the optical axis in zooming from the wide-angle end to the tele-photo end in an image-capturing operation. The zoom lens system satisfies the conditions of 4.25< [square root of] (fW*fT) / tG2 < 10.0 and fT / fW > 2.5 (tG2: the thickness of the second lens group, fT: the focal length of the entire system at the tele-photo end, fW: the focal length of the entire system at the wide-angle end).

Description

technical field [0001] The present invention relates to a zoom lens system, a photographing device, and a camera. Specifically, the present invention relates to a lens system with not only high resolution and high zoom ratio, but also a small number of lenses constituting a lens system, and the total length of the lens (from the object side of the lens element located closest to the object side of the lens system to the image plane) A high-performance zoom lens system having a short distance on the optical axis), an imaging device including the zoom lens system, and a thin and small camera including the imaging device. Background technique [0002] There are demands for miniaturization and higher performance of cameras (hereinafter, simply referred to as digital cameras) having imaging elements that perform photoelectric conversion, such as digital still cameras and digital video cameras. In particular, in recent years, there has been a demand for priority storage or portab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B13/18G03B17/17
CPCG02B15/173G03B17/17G03B17/00G02B15/145113
Inventor 松村善夫岩下勉栗冈善昭山口伸二
Owner PANASONIC CORP
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