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Imaging lens, imaging optical device, digital instrument, and production method for imaging lens

A manufacturing method and technology of an optical device are applied in the field of shooting lenses to achieve high-performance image input function and uniform image quality.

Active Publication Date: 2020-06-26
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when comparing the amount of movement of the focusing group until focusing in contrast AF and phase difference AF, the former is overwhelmingly larger

Method used

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  • Imaging lens, imaging optical device, digital instrument, and production method for imaging lens
  • Imaging lens, imaging optical device, digital instrument, and production method for imaging lens
  • Imaging lens, imaging optical device, digital instrument, and production method for imaging lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] Unit: mm

[0171] surface data

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[0173] Aspheric Data

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[0176] various data

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[0178] variable parameter

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[0180] Group movement amount (POS1→POS2)

[0181] Gr2 Gr3

[0182] -0.228 0.206

Embodiment 2

[0184] Unit: mm

[0185] surface data

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[0188] Aspheric Data

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[0190] various data

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[0192] variable parameter

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[0194] Group movement amount (POS1→POS2)

[0195] Gr2 Gr3

[0196] -0.088 0.194

Embodiment 3

[0198] Unit: mm

[0199] surface data

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[0202] Aspheric Data

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[0205] various data

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[0207] variable parameter

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[0209] Group movement amount (POS1→POS2)

[0210] Gr2 Gr3

[0211] -0.083 0.226

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Abstract

An imaging lens (LN) having, in order from the object side, a first group (Gr1) having a positive power, a second group (Gr2) having a positive power, and a third group (Gr3) having a negative power.During focusing from infinity to a close object: the first group (Gr1) has a fixed position; the second group (Gr2) and the third group (Gr3 ) move such that the gap between the first group (Gr1) andthe second group (Gr2) narrows and the gap between the second group (Gr2) and the third group (Gr3) widens; and the conditional formula 1.0 < f1 / f < 2.5 is fulfilled (f1: focal length of first group (Gr1), f: focal length of the entire system). As a result, an imaging lens is obtained that: achieves both a bright F value and a reduction in focus group weight; satisfactorily corrects aberrations from the infinite end to the closest end; and can obtain uniform image quality over the entire image.

Description

technical field [0001] The present invention relates to a photographing lens, a photographing optical device, a digital device and a manufacturing method of the photographing lens. For example, it relates to a compact, wide-angle, and large-aperture photographing lens suitable for a lens-interchangeable digital camera that captures an image of a subject through a photographic element, and outputs the image of the subject captured through the photographic lens and photographic element as an electronic device. A signal imaging optical device, a digital device equipped with an image input function such as a digital camera equipped with the imaging optical device, and a manufacturing method of an imaging lens. Background technique [0002] In recent years, digital cameras have become common as interchangeable-lens cameras. In a digital camera, a user can observe a photographed image of equal magnification through a monitor. Therefore, it is required to further improve MTF (Mod...

Claims

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Application Information

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IPC IPC(8): G02B13/00
CPCG02B13/04G02B9/64G02B15/143G02B27/0025G02B27/646G02B15/143103
Inventor 山田惠子今嶋亮介辰野亘佐藤治夫
Owner NIKON CORP
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