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Imaging optical system

a technology of optical system and image, applied in the field of imaging optical system, can solve the problems of insufficiently achieving both wide angle-of-view and image magnification at the central area of the picture frame, and the inability to achieve image having a wide angle-of-view, and achieve the effect of wide angle-of-view

Inactive Publication Date: 2021-01-28
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is an imaging optical system that can capture a wide angle of view while enlarging the central object image on the screen. It solves the problem of limited perspective in photography and video production.

Problems solved by technology

However, in the imaging optical system of Patent Literature 1, there is a problem with not being able to sufficiently achieve both a wide angle-of-view and image magnification at the central area of the picture frame.
Out of the embodiments disclosed in Patent Literature 1, the second embodiment specifies the largest of such a value (the value of the focal length of the entire optical system divided by the maximum image height) and can attain an enlarged image at the central area of the picture frame, however, the angle-of-view is only 66 degrees, so that an image having a wide angle-of-view cannot be achieved.

Method used

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Experimental program
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numerical embodiment 1

[0070]FIGS. 1 through 2D and Tables 1 through 5 show a first numerical embodiment of the imaging optical system, according to the present invention. FIG. 1 shows a lens arrangement of the imaging optical system. FIGS. 2A, 2B, 2C and 2D show various aberrations that occurred in the zoom lens system of FIG. 1. Table 1 indicates the surface data, Table 2 indicates various lens system data, Table 3 indicates focal length data, Table 4 indicates curvature data of the meridional cross-section of the aspherical surface on the object side of the positive lens element 11, which provided closest to the object side within the first lens group G1, and Table 5 indicates aspherical surface data.

[0071]The imaging optical system of the first numerical embodiment is configured of a negative first lens group G1, an aperture diaphragm S, and a positive second lens group G2, in that order from the object side. A cover glass CG is provided between the second lens group G2 and an imaging surface IM (imme...

numerical embodiment 2

[0074]FIGS. 3 through 4D and Tables 6 through 10 show a second numerical embodiment of the imaging optical system, according to the present invention. FIG. 3 shows a lens arrangement of the imaging optical system. FIGS. 4A, 4B, 4C and 4D show various aberrations that occurred in the zoom lens system of FIG. 3. Table 6 indicates the surface data, Table 7 indicates various lens system data, Table 8 indicates focal length data, Table 9 indicates curvature data of the meridional cross-section of the aspherical surface on the object side of the positive lens element 11, which provided closest to the object side within the first lens group G1, and Table 10 indicates aspherical surface data.

[0075]The second numerical embodiment has the same lens arrangement as that of the first numerical embodiment.

TABLE 6SURFACE DATAEffectiveSurf. No.rdN(d)νdAperture1*6.2546.5541.5533271.77.252*4.5761.6204.083*30.7721.9951.8211524.13.874*13.3284.9293.155(Diaphragm)∞0.2181.026*5.5781.8621.5533271.71.287*−1...

numerical embodiment 3

[0076]FIGS. 5 through 6D and Tables 11 through 15 show a third numerical embodiment of the imaging optical system, according to the present invention. FIG. 5 shows a lens arrangement of the imaging optical system. FIGS. 6A, 6B, 6C and 6D show various aberrations that occurred in the zoom lens system of FIG. 5. Table 11 indicates the surface data, Table 12 indicates various lens system data, Table 13 indicates focal length data, Table 14 indicates curvature data of the meridional cross-section of the aspherical surface on the object side of the positive lens element 11, which provided closest to the object side within the first lens group G1, and Table 15 indicates aspherical surface data.

[0077]The third numerical embodiment has the same lens arrangement as those of the first and second numerical embodiments.

TABLE 11SURFACE DATAEffectiveSurf. No.rdN(d)νdAperture1*6.3266.8181.5533271.77.582*5.0571.3404.383*35.5381.8921.8211524.14.184*13.4345.3083.465(Diaphragm)∞0.1000.986*6.7551.6711....

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Abstract

An imaging optical system includes a positive first lens group, a diaphragm and a positive second lens group. The first lens group includes a positive lens element, provided closest to the object side, that has an aspherical surface on the object side thereof, the aspherical surface including a paraxial convex surface convexing toward the object side. This aspherical surface has a curvature that is positive along a meridional cross-section at the paraxial portion thereof, and the curvature of the meridional cross-section changes from a positive value to a negative value in an area within 75% of an effective aperture from the paraxial portion toward the periphery of the aspherical surface.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a divisional application of U.S. patent application Ser. No. 15 / 722,181, filed Oct. 2, 2017, which claims the benefit of Japanese Patent Application No. 2016-232067, filed Nov. 30, 2016. The disclosure of each of the above-mentioned applications is expressly incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to an imaging optical system which can be provided in an imaging apparatus such as, e.g., an in-vehicle camera, a surveillance camera, and a portable terminal (including a mobile phone, a smart phone or other smart devices).2. Description of Related Art[0003]Patent Literature 1 discloses an imaging optical system provided with an image sensor, which converts an optical image into electrical signals, and an imaging lens group which forms an optical image onto a light-receiving surface of the image sensor. The imaging lens gr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B13/00
CPCG02B13/0045G02B15/142G02B13/18
Inventor TAKAKUBO, YUTAKATADA, EIJIROH
Owner HOYA CORP