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Variable-magnification optical system and image taking apparatus

a technology of applied in the field of variable magnification optical system and image taking apparatus, can solve the problems of not offering satisfactorily high performance, and achieve the effects of reducing (correcting) various aberrations, reducing the disadvantages resulting, and aggravating aberrations and movement strokes of lens groups

Inactive Publication Date: 2007-03-15
KONICA MINOLTA PHOTO IMAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a compact high-performance variable-magnification optical system with an image-taking apparatus. The system includes multiple lens groups that image light beams from the object side on an image sensor. An optical aperture stop intercepts part of the light beam and an optical axis changing element changes the optical axis of the light beam. The system is more compact in the direction of the optical axis change, making it easier to incorporate into the image-taking apparatus. The variable-magnification optical system provides a proper distribution of magnification variation between the lens groups, reducing aberrations and movement strokes. The system is also more compact in the depth direction, allowing for proper built-in lens groups. The present invention provides a compact high-performance image-taking apparatus with a variable-magnification optical system."

Problems solved by technology

These, however, are designed to offer zoom ratios of 7× to 10×, and therefore do not offer satisfactorily high performance.

Method used

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  • Variable-magnification optical system and image taking apparatus
  • Variable-magnification optical system and image taking apparatus
  • Variable-magnification optical system and image taking apparatus

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first embodiment

[0047] An embodiment of the present invention will be described below with reference to the drawings.

[0048] 1. Digital Still Camera

[0049]FIG. 7 is a block diagram showing the internal configuration of a digital still camera (DSC) 29 as an example of an image-taking apparatus according to the present invention.

[0050] As shown in FIG. 7, the DSC 29 includes a variable-magnification optical system OS, a flash FL, an optical system driving section 13, an image sensor SR, a signal processing section 14, a display section 15, a recording section 16, a recording medium 17, an operation section 18, and a control section 19.

[0051] The variable-magnification optical system OS directs the light from the shooting target (subject, object) to the image sensor SR, and meanwhile images the light on the photosensitive surface (image surface) of the image sensor SR. Thus, the variable-magnification optical system OS may also be called an imaging optical system or an image-taking optical system. T...

second embodiment

[0186] Another embodiment of the present invention will be described below with reference to the drawings. Such members as serve the same purposes as their counterparts in the first embodiment are identified with common reference numerals and symbols, and no explanations thereof will be repeated.

[0187] In the variable-magnification optical system OS (Example 1) of the first embodiment, the reflective mirror MR is disposed to the image side of the fourth lens group GR4. This, however, is not meant to limit the position of the reflective mirror MR in any way. To substantiate that, another (Example 2) example of the variable-magnification optical system OS will now be described with reference to FIGS. 8 and 9. In FIGS. 8 and 9, the same conventions as those used in FIGS. 1 and 2 are used.

1. Variable-Magnification Optical System of Example 2

[0188] The variable-magnification optical system OS of Example 2 shown in FIGS. 8 and 9 includes, from the shooting target (object) side, a firs...

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Abstract

A variable-magnification optical system has a plurality of lens groups that image a light beam from the object side on an image sensor, an optical aperture stop that intercepts part of the light beam heading for the image sensor, and a reflective mirror that changes the optical axis of the light beam of which part has been intercepted by the optical aperture stop. The plurality of lens groups include at least lens groups arranged in a positive-negative-positive-positive optical power arrangement, and at least two of the lens groups are moved for zooming from the wide-angle end to the telephoto end. The variable-magnification optical system fulfills a prescribed conditional formula.

Description

[0001] This application is based on Japanese Patent Application No. 2005-267874 filed on Sep. 15, 2005, the contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a variable-magnification optical system for use in a lens unit or the like, and also relates to an image-taking apparatus incorporating such a variable-magnification optical system. [0004] 2. Description of Related Art [0005] In recent years, as personal computers (PC) become widespread, digital still cameras (image-taking apparatuses), which permit easy capturing of images, have been becoming increasingly popular. In such digital still cameras (DSCs), as in cameras using silver-halide film (silver-halide cameras), compactness (slimness) and high performance (for example, a high magnification variation ratio and high aberration correction performance) are sought. Accordingly, compactness and high performance are sought in ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B15/14
CPCG02B15/173G02B15/145129
Inventor TERADA, MAMORU
Owner KONICA MINOLTA PHOTO IMAGING
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