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Image pickup apparatus having optical path reflecting zoom lens

A technology of camera device and zoom lens, which is used in optics, image communication, optical components, etc.

Inactive Publication Date: 2015-05-06
OM DIGITAL SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, when a zoom lens is to be used with a high zoom ratio, the lens group with the zoom function tends to be enlarged

Method used

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  • Image pickup apparatus having optical path reflecting zoom lens
  • Image pickup apparatus having optical path reflecting zoom lens
  • Image pickup apparatus having optical path reflecting zoom lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0262] The zoom lens of embodiment 1 is as Figure 1A , Figure 1B , figure 2 As shown, the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the brightness diaphragm S, the third lens group G3 with positive refractive power, and the fourth lens group G4 with positive refractive power are arranged in order from the object side.

[0263] When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves toward the image side, the brightness stop S is fixed, and the third lens group G3 moves toward the object side. In addition, the fourth lens group G4 moves for image plane position correction, and moves toward the object side when focusing on a short-distance object.

[0264] The first lens group G1 is composed of a negative meniscus lens with a convex surface facing the object side, an optical path bending prism, and a biconvex positive lens in order from the o...

Embodiment 2

[0267] The zoom lens of embodiment 2 is as Figure 8A , Figure 8B , Figure 9 As shown, the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the brightness diaphragm S, the third lens group G3 with positive refractive power, and the fourth lens group G4 with positive refractive power are arranged in order from the object side.

[0268] When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves toward the image side, the brightness stop S is fixed, and the third lens group G3 moves toward the object side. In addition, the fourth lens group G4 moves for image plane position correction, and moves toward the object side when focusing on a short-distance object.

[0269] The first lens group G1 is composed of a negative meniscus lens with a convex surface facing the object side, an optical path bending prism, and a biconvex positive lens in order from the ...

Embodiment 3

[0271] The zoom lens of embodiment 3 is as Figure 10A , Figure 10B , Figure 11 As shown, the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the brightness diaphragm S, the third lens group G3 with positive refractive power, and the fourth lens group G4 with positive refractive power are arranged in order from the object side.

[0272] When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves toward the image side, the brightness stop S is fixed, and the third lens group G3 moves toward the object side. In addition, the fourth lens group G4 moves for image plane position correction, and moves toward the object side when focusing on a short-distance object.

[0273] The first lens group G1 is composed of a negative meniscus lens with a convex surface facing the object side, an optical path bending prism, and a biconvex positive lens in order from t...

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PUM

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Abstract

An image pickup apparatus includes: a zoom lens; an image pickup element having an image pickup surface which receives an image which has been formed by the zoom lens, and converts to an electric signal; a shading correction parameter storage section which stores a shading correction parameter which differs at a front-surface side and a rear-surface side with respect to a center of an image, which is for correcting asymmetric shading at the front-surface side and the rear-surface side of the zoom lens; and a shading correction section which carries out correction operation of an image which has been picked up by the image pickup element, based on the shading correction parameter of the shading correction parameter storage section. When an object having a uniform brightness is captured, at any state from the wide angle end to the telephoto end, the zoom lens satisfies conditional expression (A).

Description

technical field [0001] The present invention relates to an imaging device with optical path reflective zoom lens. Background technique [0002] For example, Japanese Patent Application Laid-Open No. 2008-96559 discloses a zoom lens in which an object-side lens group having a reflective surface is disposed on the image side compared with the object-side lens group and has a wide-angle A lens group that moves toward the optical axis when zooming from the end to the telephoto end. [0003] Furthermore, Japanese Patent Application Laid-Open No. 2008-96559 discloses an imaging device in which the lens shape after reflection is an oblong (small ) shape, making the opening of the brightness aperture an ellipse. [0004] Components that affect the thickness of the main body of the imaging device include not only the optical system, but also imaging elements, display monitors, and interference components that absorb shocks. Furthermore, when the zoom lens is to be increased in zo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/177H04N5/225
CPCG02B13/0065G02B13/009G02B15/144113H04N23/55H04N25/61
Inventor 豊田哲也细谷刚渡边正仁左部校之城田英二
Owner OM DIGITAL SOLUTIONS CORP