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Real-image variable magnification finder optical system and imaging apparatus

An optical system and viewfinder technology, which is applied in the field of novel real-image variable magnification viewfinder optical system and imaging equipment, can solve the problems of cost increase, and achieve the effects of preventing diopter difference, satisfactory optical performance, and miniaturized optical performance

Inactive Publication Date: 2008-08-27
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, improvements such as additional installation of component accuracy and adjustment mechanisms are required, resulting in increased costs

Method used

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  • Real-image variable magnification finder optical system and imaging apparatus
  • Real-image variable magnification finder optical system and imaging apparatus
  • Real-image variable magnification finder optical system and imaging apparatus

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Embodiment Construction

[0018] Hereinafter, embodiments of a real-image variable magnification viewfinder optical system and an imaging device according to an embodiment of the present invention are described with reference to the drawings.

[0019] First, a real image variable magnification viewfinder optical system of an embodiment of the present invention will be described.

[0020] In order from the object side, the real image variable magnification viewfinder optical system of the embodiment of the present invention includes an objective lens group having positive refractive power, a portion for forming an erect image from an image reversed by the objective lens group (for example, prisms and mirrors), and eyepieces with positive refractive power. In order of position from the object side, the objective lens group includes a first lens group having negative refractive power and a second lens group having positive refractive power, zooming is performed by moving the first lens group and the secon...

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Abstract

A real-image variable magnification finder optical system includes, in the order from an object side, an objective lens group having a positive refractive power, a member for forming an erect image from an image inverted by the objective lens group, and an eyepiece lens having positive refractive power. The objective lens group includes, in the order from an object side, a first lens group having a negative refractive power and a second lens group having positive refractive power to perform zooming and compensate a diopter change caused by the zooming by moving the first lens group and the second lens group in an optical axis direction. The objective lens satisfies a predetermined condition.

Description

technical field [0001] The invention relates to a novel real-image variable magnification viewfinder optical system and imaging equipment. More specifically, it relates to a small-sized, satisfactory optical performance, real-image variable magnification viewfinder optical system suitable for placement in a camera such as a digital still camera, and an imaging device equipped with the real-image variable magnification viewfinder optical system. Background technique [0002] In a camera composed of a photographing optical system having a zooming function and a real image finder optical system configured as separate systems, the real image finder optical system is also provided with a change suitable for shooting angles zoom function. As such viewfinder optical systems, various types of real-image variable magnification viewfinders ensuring a satisfactory appearance of a field frame have been proposed. [0003] As real image variable magnification finder optical systems, tho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/02G02B15/16
CPCG02B15/1425
Inventor 藤原克哉
Owner SONY CORP