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Three-unit zoom lens and imaging device equipped therewith

A zoom lens and three-unit technology, applied in installation, electrical components, image communication, etc., can solve problems such as difficult high zoom ratio and insufficient number of lenses

Inactive Publication Date: 2009-04-15
OLYMPUS IMAGING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, from the viewpoint of aberration correction in the second lens unit, the number of lenses in this zoom lens is insufficient, and it is difficult to obtain a high zoom ratio while suppressing the generation of aberrations such as chromatic aberration

Method used

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  • Three-unit zoom lens and imaging device equipped therewith
  • Three-unit zoom lens and imaging device equipped therewith
  • Three-unit zoom lens and imaging device equipped therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0333] unit mm

[0334] surface data

[0335] surface number r d nd vd

[0336] Object plane ∞ ∞

[0337] 1 * -13.266 0.70 1.90366 31.32

[0338] 2 * 10.640 1.43 1.94595 17.98

[0339] 3 * 120.518 variable

[0340] 4(S) ∞ -0.40

[0341] 5 * 5.323 2.15 1.80610 40.73

[0342] 6 11.829 1.09 1.84666 23.78

[0343] 7 4.228 2.00 1.58313 59.38

[0344] 8 * 8.800 0.74

[0345] 9(FS) ∞ variable

[0346] 10 * 31.396 1.40 1.61800 63.33

[0347] 11 -16.128 1.00 1.94595 17.98

[0348] 12 -17.230 variable

[0349] 13 ∞ 0.50 1.51633 64.14

[0350] 14 ∞ 0.50

[0351] 15 ∞ 0.50 1.51633 64.14

[0352] 16 ∞ 0.42

[0353] Image plane (light receiving surface)

[0354] Aspheric coefficient

[0355] first surface

[0356] K=0.000, A4=2.25854e-04, A6=1.86696e-05,

[0357] A8=-7.96203e-07, A10=1.00881e-08

[0358] second surface

[0359] K=0.896, A4=5.34315e-04, A6=-6.01400e-05,

[0360] A8=3.06150e-06, A10=-5.43479e-08

[036...

Embodiment 2

[0388] unit mm

[0389] surface data

[0390] surface number r d nd vd

[0391] 1 * -14.278 0.70 1.90366 31.32

[0392] 2 11.423 2.19 1.94595 17.98

[0393] 3 * 101.992 variable

[0394] 4(S) ∞ -0.40

[0395] 5 * 4.853 2.00 1.80610 40.73

[0396] 6 6.262 0.70 1.84666 23.78

[0397] 7 3.448 2.00 1.58313 59.38

[0398] 8 * 7.042 0.74

[0399] 9(FS) ∞ variable

[0400] 10 * 14.000 1.40 1.49700 81.54

[0401]11 -20.483 variable

[0402] 12 ∞ 0.50 1.51633 64.14

[0403] 13 ∞ 0.50

[0404] 14 ∞ 0.50 1.51633 64.14

[0405] 15 ∞ 0.42

[0406] Image plane (light receiving surface)

[0407] Aspheric coefficient

[0408] first surface

[0409] k=0.000, A4=7.74415e-05, A6=1.92625e-05,

[0410] A8=-6.74734e-07, A10=7.65589e-09

[0411] third surface

[0412] k=0.000, A4=2.19531e-06, A6=2.08307e-05,

[0413] A8=-8.42305e-07, A10=1.11273e-08

[0414] fifth surface

[0415] k=-1.653, A4=1.64937e-03, A6=1.77730e-05,

[0416] A8=-5.696...

Embodiment 3

[0438] unit mm

[0439] surface data

[0440] surface number r d nd vd

[0441] 1 * -14.202 0.70 1.90366 31.32

[0442] 2 * 11.602 2.06 1.94595 17.98

[0443] 3 * 100.000 variable

[0444] 4(S) ∞ -0.40

[0445] 5 * 4.895 2.00 1.80610 40.73

[0446] 6 6.312 0.70 1.84666 23.78

[0447] 7 3.493 2.00 1.58313 59.38

[0448] 8 * 7.286 0.74

[0449] 9(FS) ∞ variable

[0450] 10 * 16.641 1.44 1.49700 81.54

[0451] 11 -17.351 variable

[0452] 12 ∞ 0.50 1.51633 64.14

[0453] 13 ∞ 0.50

[0454] 14 ∞ 0.50 1.51633 64.14

[0455] 15 ∞ 0.42

[0456] Image plane (light receiving surface)

[0457] Aspheric coefficient

[0458] first surface

[0459] k=0.000, A4=9.96784e-05, A6=1.88177e-05,

[0460] A8=-6.94583e-07, A10=8.21071e-09

[0461] second surface

[0462] k=1.014, A4=3.62106e-04, A6=-3.16045e-05,

[0463] A8=8.37338e-07, A10=-5.03458e-09

[0464] third surface

[0465] k=0.000, A4=3.52517e-05, A6=1.98363e-05,...

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Abstract

A three-unit zoom lens includes, in order from the object side, a negative first lens unit G1, a positive second lens unit G2 and a third lens unit G3, wherein during zooming from the wide angle end to the telephoto end the distance between the first lens unit G1 and the second lens unit G2 decreases and the distance between the second lens unit G2 and the third lens unit G3 changes. The first lens unit G1 is composed of one negative lens component including, in order from the object side, a negative lens having a concave surface directed toward the image side and a positive lens having a convex surface directed toward the object side. The second lens unit G2 includes at least one negative lens and a plurality of positive lenses, wherein at least three lenses among these lenses are cemented to adjacent lenses, the total number of lens components included in the second lens unit G2 is two or less. The third lens unit is composed of one lens component composed of two or less lenses.

Description

technical field [0001] The present invention relates to a compact zoom lens and an imaging device such as a compact digital camera equipped with such a zoom lens. Background technique [0002] Hitherto, in image pickup devices such as digital cameras and video recorders, high image quality, high zoom ratio, and thin barrel frames have been sought. [0003] For example, Japanese Patent Application Laid-Open No. 2005-308953 discloses a three-unit zoom lens composed of a first lens unit having negative refractive power, a second lens unit having positive refractive power, and a third lens unit. In this three-unit zoom lens, the first lens unit is composed of a cemented lens part including a biconcave negative lens and a positive lens in order from the object side, the second lens unit is composed of two lenses, and The third lens unit consists of one lens. This configuration facilitates downsizing of the zoom lens. [0004] However, from the viewpoint of aberration correctio...

Claims

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Application Information

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IPC IPC(8): G02B15/16G02B15/177G02B9/12G02B7/00H04N5/225
CPCG02B15/177G02B15/143507
Inventor 片仓正弘
Owner OLYMPUS IMAGING CORP
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