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Camera system, interchangeable lens and method of manufacturing interchangeable lens

a technology of interchangeable lenses and cameras, applied in the field of cameras, interchangeable lenses and methods of manufacturing interchangeable lenses, can solve the problem that the entire camera system cannot be made sufficiently compact, and achieve the effect of achieving optical performan

Inactive Publication Date: 2012-05-10
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a camera system and interchangeable lens that can achieve a compact and thin form while still maintaining optical performance. The invention satisfies certain conditions to ensure that the image circle is small and the flange back is minimal, resulting in a more compact and thin camera system. The invention also provides an interchangeable lens that can be attached to a camera body that has a camera body mount portion and an imaging element (image sensor) whose whole pixels generate imaging signals can fit inside of a circle having a diameter in a range from 14.0 mm to 20.0 mm.

Problems solved by technology

However, with prior art camera systems and interchangeable lens, the image circle is large, and there has been the problem that the entire camera system cannot be made sufficiently compact.

Method used

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  • Camera system, interchangeable lens and method of manufacturing interchangeable lens
  • Camera system, interchangeable lens and method of manufacturing interchangeable lens
  • Camera system, interchangeable lens and method of manufacturing interchangeable lens

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Experimental program
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first embodiment

The First Embodiment

[0093]FIG. 3 is a figure showing the structure of an image capture lens system according to a first embodiment of the present invention. The optical system of this interchangeable lens 1 of FIG. 3 is a zoom lens of a two-group structure incorporating a first lens group G1 and a second lens group G2, and furthermore the second lens group G2 incorporates a 2a-th lens group G2a and a 2b-th lens group G2b.

[0094]The first lens group G1 includes a first lens component L1 that is a negative meniscus lens whose convex surface faces towards the object to be photographed, a second lens component L2 that is a negative meniscus lens whose convex surface faces towards the object to be photographed, and a third lens component L3 that is a positive meniscus lens whose convex surface faces towards the object to be photographed.

[0095]The 2a-th lens group G2a is made as a cemented lens in which a fourth lens L4 that is a negative meniscus lens whose convex surface faces the objec...

second embodiment

The Second Embodiment

[0104]FIG. 4 is a figure showing the structure of an image capture lens system according to a second embodiment of the present invention. The optical system of this interchangeable lens 1 of FIG. 4 is a zoom lens of a three-group structure incorporating a first lens group G1, a second lens group G2, and a third lens group G3, and furthermore the first lens group G1 incorporates a 1a-th lens group G1a and a 1b-th lens group G1b. The 1a-th lens group G1a is made as a cemented lens in which a first lens L1 that is a negative meniscus lens whose convex surface faces the object to be photographed and a second lens L2 that is a biconvex lens are glued together.

[0105]And the 1b-th lens group G1b includes a third lens component L3 that is a positive meniscus lens whose convex surface faces towards the object to be photographed.

[0106]And the second lens group G2 includes a fourth lens component L4 that is a biconcave lens, a cemented lens in which a fifth lens component ...

third embodiment

The Third Embodiment

[0113]FIG. 5 is a figure showing the structure of an image capture lens system according to a third embodiment of the present invention. The optical system of this interchangeable lens 1 of FIG. 5 is a single focus lens incorporating a first lens group G1 and a second lens group G2.

[0114]The first lens group G1 includes a first lens component L1 that is a negative meniscus lens whose convex surface faces towards the object to be photographed, a second lens component L2 that is a negative meniscus lens whose convex surface faces towards the object to be photographed, and a third lens component L3 that is a biconvex lens.

[0115]And the second lens group G2 includes a cemented lens in which a fourth lens component L4 that is a biconcave lens and an fifth lens component L5 that is a biconvex lens are glued together, and a sixth lens component L6 that is a biconvex lens.

[0116]Furthermore, a filter group FL includes a low pass filter and an infra-red cutoff filter and s...

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Abstract

A camera system having a predetermined image circle, comprises: an interchangeable lens having a lens mount portion; and a camera body having an image sensor that is disposed within that image circle, and a body mount portion, wherein, when a radius of circular portion at a maximum internal diameter part of an opening portion of the lens mount portion is termed rM, a flange back that is a distance from the lens mount portion to a light reception surface of an image sensor in a state that the interchangeable lens and the camera body are mutually engaged is termed da, and the diameter of the image circle is termed D, the following equations are satisfied:14.0 mm≦2rM≦40.0 mm  Conditional Expression #116.0 mm≦da≦20.0 mm  Conditional Expression #214.0 mm≦D≦20.0 mm  Conditional Expression #3.

Description

INCORPORATION BY REFERENCE[0001]The disclosure of the following priority application is herein incorporated by reference: Japanese Patent Application No. 2010-226549 and Japanese Patent Application No. 2011-202391 filed Sep. 15, 2011.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a camera system that includes a camera body and an interchangeable lens, interchangeable lens and a method of manufacturing an interchangeable lens.[0004]2. Description of Related Art[0005]From the past, with digital cameras and video cameras and so on, camera systems and interchangeable lenses have been per se known that include mounts on the lens side and on the camera body side, and with which the lenses can be interchanged (for example, refer to Japanese Laid-Open Patent Publication 2005-6122).SUMMARY OF THE INVENTION[0006]However, with prior art camera systems and interchangeable lens, the image circle is large, and there has been the problem that the e...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03B17/00B23P11/00
CPCG02B7/14G02B13/00G02B15/173Y10T29/49826G02B27/646G03B17/14H04N5/2254G02B15/177
Inventor TAKE, TOSHINORIHASUDA, MASANORIKOTANI, NORIYASUHOSHIKAWA, HIDEAKI
Owner NIKON CORP