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 foc

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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[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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