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Zoom lens and camera with zoom lens

A zoom lens, focal length technology, applied in the field of zoom lens, can solve the problems of short overall length and compact structure, difficulty of zoom lens and the like

Inactive Publication Date: 2005-06-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Therefore, the design limitation is to take into account the need to insert filters at the rear of the lens (back focus) or similar rear side of the lens system and the telecentricity of the exit pupil at a large distance (infinity) on the exit side, so the realization has Short overall length and compact structure with a large variable magnification zoom lens is very difficult

Method used

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  • Zoom lens and camera with zoom lens
  • Zoom lens and camera with zoom lens
  • Zoom lens and camera with zoom lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] f=4.49-8.61 Fno=2.88-4.06 2ω=73.5-42.5

[0123] R1=23.917 D1=1.20 N1=1.740130 ν1=49.2

[0124] R2=2.886 D2=1.60

[0125] R3=5.281 D3=1.60 N2=1.846660 ν2=23.9

[0126] R4 = 9.254 D4 = variable

[0127] R5=Aperture D5=0.59

[0128] R6=4.312 D6=2.00 N3=1.687070 ν3=52.6

[0129] R7=-13.960 D7=0.20

[0130] R8=38.775 D8=0.70 N4=1.832430 ν4=23.9

[0131] R9=4.626 D9=variable

[0132] R10=21.802 D10=1.50 N5=1.487490 ν5=70.2

[0133] R11=-10.430 D11=variable

[0134] R12=13.248 D12=1.50 N6=1.487490 ν6=70.2

[0135] R13=-137.542 D13=1.00

[0136] R14=∞ D14=2.61 N7=1.516330 ν7=64.2

[0137] R15=∞

[0138] 4.49 6.60 8.61

[0139] D4 7.57 3.93 2.13

[0140] D9 2.22 2.12 2.18

[0141] D11 2.64 5.50 8.20

[0142] Aspheric coefficient

[0143] Second surface: k=-1.27013e+00 A=0 B=3.61084e-03 C=3.06032e-05

[0144] D=-1.41272e-06 E=1.48507-07

[0145] Sixth surface: k=5.83107e-01 A=0 B=-1.56459e-03 C=-2.01242e-06

[0146] D=-2.53760e-06 E=0.00...

Embodiment 2

[0150] f=4.65-8.86 Fno=2.88-4.13 2ω=71.6-41.4

[0151] R1=17.410 D1=1.20 N1=1.740130 ν1=49.2

[0152] R2 = 2.907 D2 = 1.81

[0153] R3=5.519 D3=1.60 N2=1.846660 ν2=23.9

[0154] R4 = 9.477 D4 = variable

[0155] R5=Aperture D5=0.59

[0156] R6=4.065 D6=2.00 N3=1.687070 ν3=52.6

[0157] R7=-13.092 D7=0.20

[0158] R8=48.205 D8=0.70 N4=1.832430 ν4=23.9

[0159] R9=4.471 D9=Variable

[0160] R10=43.811 D10=1.50 N5=1.487490 ν5=70.2

[0161] R11=-12.023 D11=variable

[0162] R12=13.248 D12=1.50 N6=1.696797 ν6=55.5

[0163] R13=-446.589 D13=1.00

[0164] R14=∞ D14=2.61 N7=1.516330 ν7=64.2

[0165] R15=∞

[0166] 4.65 6.84 8.86

[0167] D4 7.40 3.81 2.11

[0168] D9 1.89 1.78 1.98

[0169] D11 2.76 5.74 8.41

[0170] Aspheric coefficient

[0171] Second surface: k=-1.62957e+00 A=0 B=5.23543e-03 C=-4.56125e-05

[0172] D=8.70345e-07 E=1.10972e-07

[0173] Sixth surface: k=4.26982e-01 A=0 B=-1.65814e-03 C=-1.30170e-04

[0174] D=-1.60072e-0...

Embodiment 3

[0178] f=4.65-8.86 Fno=2.88-4.08 2ω=71.5-41.4

[0179] R1=25.960 D1=1.20 N1=1.740130 ν1=49.2

[0180] R2=3.125 D2=1.61

[0181] R3=5.787 D3=1.70 N2=1.846660 ν2=23.9

[0182] R4 = 11.186 D4 = variable

[0183] R5=Aperture D5=0.70

[0184] R6=4.000 D6=2.00 N3=1.743300 ν3=49.3

[0185] R7=-11.431 D7=0.20

[0186] R8=-27.218 D8=0.70 N4=1.832430 ν4=23.9

[0187] R9=4.828 D9=2.21

[0188] R10=44.071 D10=1.30 N5=1.622296 ν5=53.2

[0189] R11=-17.547 D11=variable

[0190] R12=11.053 D12=1.60 N6=1.696797 ν6=55.5

[0191] R13=136.453 D13=1.25

[0192] R14=∞ D14=1.60 N7=1.516330 ν7=64.1

[0193] R15=∞

[0194] 4.65 6.75 8.86

[0195] D4 7.51 3.91 2.02

[0196] D9 2.44 5.17 7.91

[0197] Aspheric coefficient

[0198] Second surface: k=-1.18040e+00 A=0 B=2.21207e-03 C=6.47021e-05

[0199] D=-5.03611e-06 E=2.27215e-07

[0200] Sixth surface: k=3.15667e-01 A=0 B=-1.17160e-03 C=-9.96037e-05

[0201] D=-9.51895e-06 E=-5.32423e-07

[0202] Ninth surfa...

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Abstract

A zoom lens, which comprises in sequence from the object side to the image side: a first lens group with negative dioptric power and a second lens group with positive dioptric power. Zooming is performed by changing the interval between the first lens group and the second lens group. The second lens group includes an aspheric positive lens and an aspheric negative lens sequentially from the object side to the image side.

Description

technical field [0001] The present invention relates to a compact zoom lens with wide field of view suitable for digital still life cameras, video cameras, movie cameras, etc., especially to a zoom lens with good portability. The zoom lens has a widened photographic field of view and a shortened total length. Background technique [0002] In recent years, compatibility of good optical performance of the optical system with miniaturization of the system itself is essential for advanced functions of video cameras (optical devices) such as video cameras using solid-state image pickup devices, digital cameras, and electronic still cameras . [0003] In this type of camera, various optical components such as a low-pass filter and a color correction filter need to be provided between the rearmost part of the lens and the image pickup device, so a lens system with a large back focus needs to be used in the optical system . Also, in the case of a camera using a color image pickup ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/16G02B13/18G02B13/22G02B15/177G02B15/20
CPCG02B15/177G02B15/143507G02B15/1425G02B13/009G02B3/0087G02B3/04G02B3/0062G03B17/12G02B2003/0093H04N23/55
Inventor 伊藤良纪
Owner CANON KK