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Zoom lens unit, imaging device and portable information terminal device

A zoom lens and unit system technology, applied in optical elements, instruments, optics, etc., can solve the problems of shortening the collapsed state of the zoom lens unit, insufficient zoom lens unit, and overall length reduction.

Inactive Publication Date: 2014-10-15
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zoom lens units disclosed in JP H08-248317A and JP3391342B do not fully meet the current requirements in terms of wide angle
[0014] The zoom lens unit disclosed in JP2004-333768 has a wide angle, wherein the half-field angle at the wide-angle end is about 37 degrees, but the entire zoom lens unit is composed of many lenses, up to 14 lenses, so that the overall collapsed state of the zoom lens unit is shortened Problems with length and cost reduction
[0015] In the zoom lens unit disclosed in JP2008-026837A, wide-angle and high magnification are achieved with a relatively simple structure, but the total length of the zoom lens unit at the telephoto end is too long, so there is still room for improvement in reducing the size of the zoom lens unit

Method used

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  • Zoom lens unit, imaging device and portable information terminal device
  • Zoom lens unit, imaging device and portable information terminal device
  • Zoom lens unit, imaging device and portable information terminal device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0312] Table 1

[0313] f=5.07-34.50, F=3.48-5.65, ω=39.79-6.52

[0314]

[0315]

[0316] Aspheric surface (aspheric surface is the surface with an asterisk "*" in the above data. The situation is similar in the following example).

[0317] Sixth surface

[0318] K=0.0, A 4 =2.47187×10 -5 , A 6 =-2.33739×10 -6 , A 8 =1.40335×10 -7 ,

[0319] A 10 =-3.70011×10 -9 , A 12 =3.54383×10 -12 , A 14 = 6.39319×10 -13

[0320] Tenth surface

[0321] K=0.0, A 4 = -3.99709×10 -4 , A 6 = -3.19281×10 -6 , A 8 =-1.20904×10 -7 ,

[0322] A 10 =-3.19854×10 -8

[0323] Twelfth surface

[0324] K=0.0, A 4 =-8.15177×10 -4 , A 6 =1.43767×10 -5 , A 8 =-1.42505×10 -6 ,

[0325] A 10 =9.97953×10 -8

[0326] Thirteenth surface

[0327] K=0.0, A 4 =5.34757×10 -4 , A 6 =2.83041×10 -5 , A 8 =-2.34413×10 -6 ,

[0328] A 10 =1.69514×10 -7

[0329] Seventeenth surface

[0330] K=0.0, A 4 = -1.04517×10 -4 , A 6 =7.81280×10 -6 , A 8 = -2.51666×10 -7 ,

[0331] A 10 =4.09360×10 -9

[0332] Table 2

[0333] variable

[0334]

Short...

example 2

[0345] table 3

[0346] f=5.07-34.53, F=3.45-5.61, ω=39.75-6.55

[0347]

[0348]

[0349] Aspheric surface

[0350] Sixth surface

[0351] K=0.0, A 4 = 4.38118×10 -5 , A 6 =-3.28212×10 -6 , A 8 =1.67801×10 -7 ,

[0352] A 10 = -4.32537×10 -9 , A 12 =-1.26659×10 -11 , A 14 =1.27763×10 -12

[0353] Tenth surface

[0354] K=0.0, A 4 =-4.80018×10 -4 , A 6 = -4.53081×10 -6 , A 8 = -2.73503×10 -7 ,

[0355] A 10 = -5.07166×10 -8

[0356] Twelfth surface

[0357] K=0.0, A 4 =-8.76064×10 -4 , A 6 =1.71719×10 -5 , A 8 =-1.39333×10 -6 ,

[0358] A 10 =9.31505×10 -8

[0359] Thirteenth surface

[0360] K=0.0, A 4 =5.89357×10 -4 , A 6 =3.03606×10 -5 , A 8 =-2.25267×10 -6 ,

[0361] A 10 =1.54591×10 -7

[0362] Seventeenth surface

[0363] K=0.0, A 4 =-5.88625×10 -5 , A 6 =1.08911×10 -5 , A 8 = -4.32420×10 -7 ,

[0364] A 10 =7.34514×10 -9

[0365] Table 4

[0366] variable

[0367]

Short focal end

Intermediate focal length

Telephoto end

f＝5.075

f＝13.180

f＝34.531

A

0.600

8.169

14.520

B

...

example 3

[0378] table 5

[0379] f=5.07-34.45, F=3.44-5.57, ω=39.77-6.81

[0380]

[0381] Aspheric surface

[0382] Fourth surface

[0383] K=0.0, A 4 = -2.61959×10 -6 , A 6 = -4.61000×10 -8 , A 8 =4.12097×10 -10 ,

[0384] A 10 = -2.83406×10 -12

[0385] Sixth surface

[0386] K=0.0, A 4 =4.69989×10 -5 , A 6 = -6.00298×10 -6 , A 8 =2.85972×10 -7 ,

[0387] A 10 = -4.67475×10 -9 , A 12 =-8.20307×10 -11 , A 14 =2.46554×10 -12

[0388] Tenth surface

[0389] K=0.0, A 4 = -5.17867×10 -4 , A 6 = -9.91338×10 -6 , A 8 = -2.02961×10 -7 ,

[0390] A 10 = -5.38642×10 -8

[0391] Twelfth surface

[0392] K=0.0, A 4 = -7.45563×10 -4 , A 6 =1.45957×10 -5 , A 8 = -1.41743×10 -6 ,

[0393] A 10 =1.11141×10 -7

[0394] Thirteenth surface

[0395] K=0.0, A 4 =7.01916×10 -4 , A 6 =2.59719×10 -5 , A 8 =-2.44987×10 -6 ,

[0396] A 10 =1.76570×10 -7

[0397] Seventeenth surface

[0398] K=0.0, A 4 =-2.49031×10 -5 , A 6 = 6.74925×10 -6 , A 8 =-2.86346×10 -7 , A 10 =4.04476×10 -9

[0399] Table 6

[0400] variable

[0401]

Short...

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Abstract

A zoom lens unit, including in order from the object side to the image side: a first lens group with positive refractive power; a second lens group with negative refractive power; a third lens group with positive refractive power; and a fourth lens with positive refractive power. group, the aperture is set between the second lens group and the third lens group, the third lens group has a positive lens made of optical glass material that satisfies the following equations (1) to (3): (1) 1.52<nd< 1.62; (2) 65.0<vd<75.0; (3)0.015<Pg, F-(-0.001802×vd+0.6483)<0.050, where nd represents the refractive index of the optical glass material, and vd represents the Abbe number of the optical glass material , and Pg, F represents the local dispersion ratio of the optical glass material. The dispersion ratio is defined by the following formula: Pg, F = (ng-nF) / (nF-nC), where ng, nF and nC represent the optical glass material respectively. For the refractive index of g-line, F-line and C-line.

Description

[0001] This application is a divisional application for a Chinese invention patent application (application number: 201010167188.0, invention title: zoom lens unit, imaging device and portable information terminal device) filed in China by the applicant Ricoh Co., Ltd. on April 23, 2010. Technical field [0002] The present invention relates to a zoom lens unit, an imaging device and a portable information terminal device. Background technique [0003] In recent years, digital cameras have gradually become popular. Users have various requirements for digital cameras. Specifically, users always require cameras with high image quality and small size. For zoom lens units used as shooting lenses, high performance and compact structure are required. [0004] From the viewpoint of compactness of the zoom lens unit, it is necessary to shorten the total length (the distance from the lens surface closest to the object side to the image surface) when using the zoom lens. In addition, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173
Inventor 大桥和泰
Owner RICOH KK
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