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Wide-angle optical system, imaging lens device, monitor camera, and digital apparatus

A wide-angle optical system and lens technology, applied in the field of wide-angle optical systems, can solve problems such as insufficient correction of chromatic aberration and reduced contrast of the picture

Active Publication Date: 2010-08-18
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the wide-angle optical system disclosed in the above-mentioned Patent Document 1 and Patent Document 2, although the prevention of darkening and the suppression of the change of the imaging position in a wide temperature environment are achieved, the correction of chromatic aberration accompanying the compactness of the optical system is insufficient. , therefore, the overall contrast of the screen is reduced

Method used

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  • Wide-angle optical system, imaging lens device, monitor camera, and digital apparatus
  • Wide-angle optical system, imaging lens device, monitor camera, and digital apparatus
  • Wide-angle optical system, imaging lens device, monitor camera, and digital apparatus

Examples

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Embodiment 1

[0239] Figure 5 It is a cross-sectional view showing the arrangement of lens groups in the wide-angle optical system of the first embodiment. Figure 25 is an aberration diagram of the lens group in the wide-angle optical system of Example 1.

[0240] Such as Figure 5 As shown, the wide-angle optical system 1A of Embodiment 1 has a positive and positive two-component structure in order from the object side to the image side, and includes: a front group lens group (Gr1) having positive optical power as a whole , an aperture stop ST for adjusting the amount of light, a lens group (Gr2) of the rear group having positive optical power as a whole. The lens group Gr1 of the front group and the lens group Gr2 of the rear group are respectively arranged with an aperture stop therebetween.

[0241] More specifically, the wide-angle optical system 1A of Embodiment 1 is composed of the lens groups ( Gr1 , Gr2 ) of the front group and the rear group as follows from the object side to...

Embodiment 2

[0298] Figure 6 It is a cross-sectional view showing the arrangement of lens groups in the wide-angle optical system of the second embodiment. Figure 26 is an aberration diagram of the lens group in the wide-angle optical system of Example 2.

[0299] Such as Figure 6 As shown, the wide-angle optical system 1B of Embodiment 2 has a positive and positive two-component structure in order from the object side to the image side, and includes: a front group lens group (Gr1) having positive optical power as a whole , an aperture stop ST for adjusting the amount of light, a lens group (Gr2) of the rear group having positive optical power as a whole.

[0300] More specifically, the wide-angle optical system 1B of the second embodiment is composed of the lens groups ( Gr1 , Gr2 ) of the front group and the rear group as follows from the object side toward the image side.

[0301] The first lens group (Gr1) includes: a negative meniscus lens convex to the object side (first lens L...

Embodiment 3

[0342] Figure 7 It is a cross-sectional view showing the arrangement of lens groups in the wide-angle optical system of Example 3. Figure 27 It is an aberration diagram of the lens group in the wide-angle optical system of Example 3.

[0343] Such as Figure 7 As shown, the wide-angle optical system 1C of Embodiment 3 has a positive and positive two-component structure in order from the object side to the image side, and includes: a front group lens group (Gr1) having positive optical power as a whole , an aperture stop ST for adjusting the amount of light, a lens group (Gr2) of the rear group having positive optical power as a whole.

[0344] More specifically, the wide-angle optical system 1C of the third embodiment is configured as follows from the object side to the image side of each lens group ( Gr1 , Gr2 ) of the front group and the rear group.

[0345] The first lens group (Gr1) includes: a negative meniscus lens convex to the object side (first lens L1), a negati...

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Abstract

The invention relates to a wide-angle optical system, imaging lens device, monitor camera, and digital apparatus. A wide-angle optical system comprises a front lens group (11), and a rear lens group (12), with an aperture stop (13) interposed between. The front lens group (11) includes at least two negative lenses (111, 112) and at least one positive lens (113). At least one of the positive lenses included in the front lens group (11) has at least one a spherical surface. The front lens group (11) satisfies the conditional expression [nv]dp<29 where [nv]dp is the minimum value of the Abbe number of the positive lens(es) included in the front lens group (11).

Description

technical field [0001] The present invention relates to a compact wide-angle optical system with a large field of view, and in particular to a wide-angle optical system suitable for an ultra-wide-angle ultra-wide-angle optical system with a full field of view of 90 degrees or more. Furthermore, the present invention relates to an imaging lens device equipped with the wide-angle optical system, and a surveillance camera and digital equipment equipped with the imaging lens device. Background technique [0002] When capturing surrounding video information over a wide range with a small number of cameras, a wide-angle optical system having a large photographing angle of view (large angle of view) is generally used. Such wide-angle optical systems are used in applications such as surveillance and vehicle use. [0003] For example, in-vehicle cameras for vehicle rear monitors are required not only to have a large field of view, but also to be more compact in terms of practicality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/06G02B13/004
Inventor 松坂庆二中谷通
Owner KONICA MINOLTA INC