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Chromatic aberration correction imaging optical system

A technology of imaging optics and chromatic aberration, applied in the direction of optics, optical components, filters, etc., can solve problems such as the influence of surface precision, inappropriate methods of painting or ink painting, etc., and achieve good correction without destroying the effect of color balance

Inactive Publication Date: 2008-06-11
TAMRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a compound lens formed of a resin layer, the surface of the resin layer is soft, which affects the surface accuracy within the effective range, so such a method is not ideal.
In addition, since the surface of the resin layer is close to a mirror surface, it is not appropriate to apply paint or ink.

Method used

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  • Chromatic aberration correction imaging optical system
  • Chromatic aberration correction imaging optical system
  • Chromatic aberration correction imaging optical system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0082] Optical data of the first embodiment of the chromatic aberration corrected imaging optical system of the present invention are shown below. The focal length is 4.95mm, the aperture number is 1.2, and the half field of view is 38.1°.

[0083] face number

radius of curvature

interval

Nd

v

1

43.0000

1.2

1.77250

49.6

2

7.2750

4.5

1

3

-24.5703

0.8

1.69680

55.5

4

15.2361

0.5

1

5

15.2392

2.1

1.84666

23.8

6

154.7140

5.7154

1

aperture

∞

5.2065

1

8

14.5746

3.5

1.63854

55.4

9

-89.5954

0.15

1

10

11.5187

2.5

1.63854

55.4

11

33.3420

1.4

1

12

-23.5330

0.6

1.84666

23.8

13

15.5161

...

no. 2 Embodiment approach

[0095] A second embodiment of the chromatic aberration corrected imaging optical system of the present invention is shown below. The focal length is 4.95mm and the aperture number is 1.2. 8 is an optical diagram of an imaging lens system according to a second embodiment of the present invention. The second embodiment is a form in which the coatings shown below are directly provided on the lens surface of an imaging lens system shown in Comparative Example 1 described later.

[0096] Figure 9 The 14th surface of the imaging lens system showing the second embodiment is formed on its annular peripheral portion with Figure 10 The optical properties shown in the transmittance are obtained from the coated portion 120 . The central portion is the transmissive portion 122, but an anti-reflection film is provided as necessary. The coating portion 120 is cut at 120° intervals because there is provided a leg portion (not shown) for supporting an evaporation preventing member for no...

no. 3 Embodiment approach

[0101] A third embodiment of the chromatic aberration corrected imaging optical system of the present invention is shown below. The focal length is 4.95mm and the aperture number is 1.2. In the third embodiment, the same imaging lens system as in the first embodiment is used, but instead of a filter having image 3 Uniform transmission filters with optical characteristics shown.

[0102] Figure 15 In the imaging lens system corresponding to the first embodiment figure 2 A perspective view of a disc-shaped optical filter 210. Figure 15 212 - 1 , 212 - 2 , and 212 - 3 of the optical filter portion 212 provided on the annular peripheral portion shown in the figure have transmittances of optical characteristics such that the cutoff wavelength region becomes wider toward the peripheral portion. The central portion is the transmissive portion 214, but an anti-reflection film is provided on the substantially central portion 214 as necessary. Figure 16 expressed in Figure 15...

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PUM

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Abstract

A chromatic aberration correction imaging optical system which has removed the chromatic aberration of the halo portion of a light flux in a specific wavelength region that passes through the peripheral edge of a lens system by providing a light shielding means for shielding a light flux in a specific wavelength region at a specified lens surface peripheral edge out of the above lens system. Accordingly, an imaging optical system which has chromatic aberration specially at a halo portion favorably corrected is provided without increasing the number of sheets of lens over a conventional imaging optical system having the same optical performance and without using an expensive special low-dispersion glass material.

Description

technical field [0001] The present invention relates to a chromatic aberration-corrected imaging optical system that can also be used with large-aperture and wide-angle lenses. More specifically, it relates to a chromatic aberration-corrected imaging optical system that shields a specific wavelength region to correct chromatic aberration. Background technique [0002] In recent years, surveillance cameras called CCTV and high-definition digital cameras with more than 2 million pixels have imaging optical systems that, due to their high definition, have significant residual lateral chromatic aberration and color bleeding in imaging. In particular, when an object such as a small high-brightness object exists in a dark background is imaged in a state where the aperture is released, color bleeding such as blue may occur around the image of the high-brightness object. [0003] In addition, large aperture, small size, and low cost are common desires, so it is best to avoid increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31G02B13/00G02B5/00G02B5/20G02B27/00G02B27/58
CPCG02B27/58G02B13/0095G02B5/20G02B5/005G02B27/0025G02B13/00
Inventor 渡边祐子坂本敬志平广行中井正刚
Owner TAMRON