Wide angle lens

A wide-angle lens, lens technology, applied in optical components, instruments, optics, etc., can solve problems such as residual resolution, drop, and inability to stabilize lens bonding

Active Publication Date: 2016-12-07
NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even if the cemented lens is disposed adjacent to the diaphragm on the rear side (image side) as in the wide-angle lens described in Patent Document 1, there is a problem that other aberrations remain and the resolution decreases.
In addition, if the cemented lens is arranged behind the diaphragm, the absolute value of the radius of curvature of the cemented surface becomes extremely small, so that the manufacturing of the lens for the cemented lens or the bonding of the lens cannot be performed stably, so it is not preferable.

Method used

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Experimental program
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Embodiment approach 1

[0052]Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) are explanatory diagrams of a wide-angle lens related to Embodiment 1 of the present invention, Fig. 1 (a) is an explanatory diagram showing a lens structure, Fig. 1 (b ) is an explanatory diagram showing physical properties of each surface, etc., and FIG. 1( c ) is an explanatory diagram showing aspheric coefficients. 2( a ), FIG. 2( b ), and FIG. 2( c ) are explanatory diagrams showing aberrations of the wide-angle lens according to Embodiment 1 of the present invention, and FIG. 2( a ) is an explanatory diagram of lateral chromatic aberration. , FIG. 2(b) is an explanatory diagram of field curvature aberration, and FIG. 2(c) is an explanatory diagram of distortion aberration. 3(a), FIG. 3(b), FIG. 3(c), FIG. 3(d), and FIG. 3(e) are explanatory diagrams showing lateral aberration of the wide-angle lens according to Embodiment 1 of the present invention, Figure 3(a) shows the lateral aberration in the tangential direction (Y direction...

Embodiment approach 2

[0092]4( a ), FIG. 4( b ), and FIG. 4( c ) are explanatory diagrams of the wide-angle lens according to Embodiment 2 of the present invention. 4( a ) is an explanatory diagram showing a lens structure, FIG. 4( b ) is an explanatory diagram showing physical properties of each surface, etc., and FIG. 4( c ) is an explanatory diagram showing aspheric coefficients. 5( a ), FIG. 5( b ), and FIG. 5( c ) are explanatory diagrams showing aberrations of the wide-angle lens according to Embodiment 2 of the present invention, and FIG. 5( a ) is an explanatory diagram of lateral chromatic aberration. , FIG. 5(b) is an explanatory diagram of field curvature aberration, and FIG. 5(c) is an explanatory diagram of distortion aberration. 6(a), FIG. 6(b), FIG. 6(c), FIG. 6(d), and FIG. 6(e) are explanatory diagrams showing lateral aberration of the wide-angle lens according to Embodiment 2 of the present invention, Figure 6(a) shows the lateral aberration in the tangential direction (Y directi...

Embodiment approach 3

[0120] Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) are explanatory diagrams of the wide-angle lens related to Embodiment 3 of the present invention, Fig. 7 (a) is the explanatory diagram showing lens structure, Fig. 7 (b ) is an explanatory diagram showing physical properties of each surface, etc., and FIG. 7( c ) is an explanatory diagram showing aspheric coefficients. 8( a ), FIG. 8( b ), and FIG. 8( c ) are explanatory diagrams showing aberrations of the wide-angle lens according to Embodiment 3 of the present invention, and FIG. 8( a ) is an explanatory diagram of lateral chromatic aberration. , FIG. 8(b) is an explanatory diagram of field curvature aberration, and FIG. 8(c) is an explanatory diagram of distortion aberration. 9( a ), FIG. 9( b ), FIG. 9( c ), FIG. 9( d ), FIG. 9( e ), and FIG. 9( f ) are horizontal images showing the wide-angle lens according to Embodiment 3 of the present invention. As an explanatory diagram of the difference, Fig. 9(a) shows the lateral aberrati...

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Abstract

A wide angle lens is capable of reducing various aberrations even when a cemented lens is disposed to an image side (L2) of a diaphragm and whose absolute value of a radius of curvature of cemented faces of lenses structuring a cemented lens can be relatively increased. The wide angle lens (100) has a lens constitution of five groups having six lenses. A first lens (110) and a second lens (120) have negative focal power and a third lens (130) and a fourth lens (140) have positive focal power. A fifth lens (150) is a plastic lens whose concave surface is directed to an object side (L1) and its concave surface is directed to the image side (L2) and having the negative focal power. A sixth lens (160) is a plastic lens whose convex surface is directed to the object side (L1) and its convex surface is directed to the image side (L2) and having the positive focal power. A diaphragm (190) is configured between the third lens (130) and the fourth lens (140). The fifth lens (150) and the sixth lens (160) are cemented lenses.

Description

technical field [0001] The invention relates to a wide-angle lens used in various shooting systems. Background technique [0002] Lenses installed in surveillance cameras, vehicle cameras, and portable device cameras need to have an angle of view of 90° or more and reduce aberrations so that sufficient resolution can be obtained. In addition, a configuration has been proposed in which, in a lens configuration of five lenses in four groups, a diaphragm is disposed between the third group and the fourth group, and a cemented lens formed by bonding a plastic lens is disposed on the rear side as the fourth group ( image side) adjacent to the aperture to reduce costs or improve chromatic aberrations (refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent No. 5064154 [0004] However, even if the cemented lens is disposed adjacent to the diaphragm on the rear side (image side) like the wide-angle lens described in Patent Document 1, there is a problem that othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06G02B13/18
CPCG02B13/06G02B13/04G02B9/60
Inventor 小宫山忠史
Owner NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION
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