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Aspherical surface camera lens

A technology of photographic lens and aspheric surface, which is applied in the field of photographic lens, can solve the problems of enlargement, etc., and achieve the effect of ensuring telecentricity, good telecentricity, and suppressing telephoto ratio

Active Publication Date: 2009-06-10
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent document JP-A-2004-240063 is also the same, telephoto ratio 1.42~1.56 will become larger

Method used

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  • Aspherical surface camera lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Focus distance: f=3.41

[0088] F NO: F2.89

[0089] Picture angle: 2ω=70.9°

[0090] r d n d v d

[0091] 1 1.086 0.48 1.54340 56.5

[0092] 2 2.822 0.78

[0093] 3 -0.649 0.35 1.58340 30.2

[0094] 4 -0.772 0.03

[0095] 5 5.950 0.84 1.51357 56.8

[0096] 6 4.879 0.50

[0097] 7 ∞ 0.50 1.51680 64.2

[0098] 8 ∞ 0.61

[0099] f / f 2 = 0.02

[0100] f / f 3 = -0.05

[0101] R 31 / R 32 = 1.22

[0102] d3 / d 1 = 1.75

[0103] T / f=1.15

[0104] α= 23.0° (Maximum incident angle of the camera element)

[0105] Spherical difference, abundant point difference, distorted difference

[0106] Pupil Height Area Height S M (Percentage)

[0107] 0 0 0 0 0 0

[0108] 0.1 0.001059 0.1 0.000538 0.005763 0.04163

[0109] 0.2 0.003674 0.2 -0.0022 0.00624 0.06538

[0110] 0.3 0.006384 0.3 -0.00816 0.009247 0.03118

[0111] 0.4 0.007321 0.4 -0.01312 0.015516 -0.03499

[0112] 0.5 0.004676 0.5 -0.01801 0.001716 -0.17472

[0113] 0.6 -0.00289 0.6 -0.02436 -0.02...

Embodiment 2

[0120] Focus distance: f=3.36

[0121] F NO: F3.43

[0122] Picture angle: 2ω=71.6°

[0123] r d n d v d

[0124] 1 1.016 0.43 1.54340 56.5

[0125] 2 2.812 0.75

[0126] 3 -0.740 0.35 1.58340 30.2

[0127] 4 -0.877 0.05

[0128] 5 16.389 0.87 1.51357 56.8

[0129] 6 6.116 0.45

[0130] 7 ∞ 0.50 1.51680 64.2

[0131] 8 ∞ 0.52

[0132] f / f 2 = -0.02

[0133] f / f 3 = -0.17

[0134] R 31 / R 32 = 2.68

[0135] d 3 / d 1 = 2.02

[0136] T / f=1.12

[0137] α = 24.5° (the maximum incident angle of the camera element)

[0138] Spherical spread Non-point spread Distorted spread

[0139] Pupil Height Area Height S M (Percentage)

[0140] 0 0 0 0 0 0

[0141] 0.1 -0.00022 0.1 0.003894 0.015687 0.10127

[0142] 0.2 -0.00084 0.2 0.007271 0.02889 0.22746

[0143] 0.3 -0.00181 0.3 0.004197 0.027334 0.24727

[0144] 0.4 -0.00308 0.4 -0.00255 0.021644 0.1946

[0145] 0.5 -0.00477 0.5 -0.01022 0.008804 0.10546

[0146] 0.6 -0.00706 0.6 -0.01737 -0.0123 -0.0063...

Embodiment 3

[0153] Focus distance: f=3.37

[0154] F NO: F3.20

[0155] Picture angle: 2ω=71.0°

[0156] r d n d v d

[0157] 1 1.025 0.46 1.54340 56.5

[0158] 2 2.931 0.74

[0159] 3 -0.742 0.35 1.58340 30.2

[0160] 4 -0.895 0.03

[0161] 5 11.820 0.89 1.51357 56.8

[0162] 6 5.301 0.28

[0163] 7 ∞ 0.50 1.51680 64.2

[0164] 8 ∞ 0.65

[0165] f / f 2 = -0.07

[0166] f / f 3 = -0.17

[0167] R 31 / R 32 = 2.23

[0168] d 3 / d 1 = 1.93

[0169] T / f=1.11

[0170] α = 24.5° (the maximum incident angle of the camera element)

[0171] Spherical spread Non-point spread Distorted spread

[0172]Pupil Height Area Height S M (Percentage)

[0173] 0 0 0 0 0 0

[0174] 0.1 0.0016 0.1 0.010185 0.030312 0.1898

[0175] 0.2 0.006118 0.2 0.019191 0.044109 0.31237

[0176] 0.3 0.01278 0.3 0.017312 0.039342 0.21015

[0177] 0.4 0.020421 0.4 0.011898 0.039287 0.05612

[0178] 0.5 0.027459 0.5 0.006455 0.031398 -0.07446

[0179] 0.6 0.03196 0.6 0.001093 0.007964 -0.18709 ...

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PUM

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Abstract

The invention relates to aspheric surface photographic lens. The photographic lens orderly formed by aperture, the first lens optic, the second lens optic, and third lens optic is set from the object side to imaging side. The first lens optic is positive convex-concave lens one with towards the object side convex surface. The second is the convex-concave lens one with towards the imaging side convex surface is. The third is the convex-concave lens one with towards the object side convex surface. All of them are formed by aspheric surface plastic lens optic. Their whole optical system focal lengths are respectively f, f2, and f3 which satisfies f / f2 is more than -0.20 and less than 0.15; f / f3 is more than -0.25 and less than 0.20. Thus it can restrain far seeing ratio to realize miniaturization camera lens and ensure good telecentric.

Description

technical field [0001] The present invention relates to a photographic lens, and particularly refers to a photographic lens in which an aperture, a first lens optic, a second lens optic and a third lens optic are sequentially arranged from the object side. Background technique [0002] With the miniaturization of digital cameras and mobile phones, the photographic optical systems used in these are also required to be further miniaturized. Generally speaking, most of the imaging elements used in the imaging optical system are CCDs, and in terms of the characteristics of the imaging elements, telecentricity is also required to ensure the design of the imaging optical system. However, in general, in order to realize the miniaturization of the photographing optical system, the overall length of the optical system is shortened, which has the disadvantage of poor telecentricity. [0003] In the past, the compact photographic lens that improved the above-mentioned telecentricity (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/02G02B13/18G03B30/00
Inventor 野田小百合
Owner LARGAN PRECISION
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