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Wide-angle lens, lens unit and photographing device

A wide-angle lens and lens technology, applied in the field of wide-angle lenses, can solve the problems of optical performance degradation, inability to achieve cost reduction, inability to ensure weather resistance, etc.

Active Publication Date: 2021-12-14
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If aspherical glass is used like the former, the cost will increase significantly, and cost reduction cannot be achieved
In addition, in the case of an optical system in which all six lenses are made of plastic lenses like the latter, since plastic has a greater change in refractive index due to temperature changes than glass, sufficient weather resistance cannot be ensured. The optical performance will be further degraded in the environment

Method used

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  • Wide-angle lens, lens unit and photographing device
  • Wide-angle lens, lens unit and photographing device
  • Wide-angle lens, lens unit and photographing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The overall parameters of the wide-angle lens of Example 1 are as follows.

[0069] f=0.97mm

[0070] 2ω=220°

[0071] TL=12.60mm

[0072] Fno=2.00

[0073] The data of the lens surface of the wide-angle lens of Example 1 are shown in Table 1 below. In addition, in the following Table 1 and the like, "Surf.N" indicates a surface number, "ST" indicates an aperture stop, and "INF" indicates infinity.

[0074] 〔Table 1〕

[0075]

[0076]

[0077] The aspheric coefficients of the lens surfaces of Example 1 are shown in Table 2 below. In addition, in the following (including the lens data in the table), E (such as 2.5E-02) represents the power of 10 (such as 2.5×10 -02 ).

[0078] 〔Table 2〕

[0079] side 3

[0080] K=8.2528E+00, A4=4.6306E-03, A6=-6.1485E-05,

[0081] A8=-2.0866E-05, A10=-2.2643E-06, A12=3.9267E-07,

[0082] A14=4.6273E-08, A16=-1.1416E-08, A18=4.7261E-10

[0083] side 4

[0084] K=-1.5119E+00, A4=3.4228E-02, A6=4.2339E-02,

[0085] A8=-7...

Embodiment 2

[0118] The overall parameters of the wide-angle lens of Example 2 are as follows.

[0119] f=0.97mm

[0120] 2ω=220°

[0121] TL=12.50mm

[0122] Fno=2.00

[0123] The data of the lens surface of the wide-angle lens of Example 2 are shown in Table 4 below.

[0124] 〔Table 4〕

[0125]

[0126] The aspheric coefficients of the lens surfaces of Example 2 are shown in Table 5 below.

[0127] 〔table 5〕

[0128] side 3

[0129] K=8.2921E+00, A4=4.6147E-03, A6=-6.7867E-05,

[0130] A8=-2.0875E-05, A10=-2.1899E-06, A12=4.0603E-07,

[0131] A14=4.7696E-08, A16=-1.1343E-08, A18=4.6375E-10

[0132] side 4

[0133] K=-1.4955E+00, A4=3.4590E-02, A6=4.7498E-02,

[0134] A8=-8.8441E-02, A10=1.0154E-01, A12=-6.2175E-02,

[0135] A14=1.9774E-02, A16=-2.5234E-03, A18=0.0000E+00

[0136] side 5

[0137] K=1.5445E+00, A4=-3.2038E-02, A6=-1.7251E-04,

[0138] A8=1.6777E-01, A10=-5.5512E-01, A12=8.8156E-01,

[0139] A14=-7.4537E-01, A16=3.2446E-01, A18=-5.7103E-02

[0140] side ...

Embodiment 3

[0167] The overall parameters of the wide-angle lens of Example 3 are as follows.

[0168] f=0.97mm

[0169] 2ω=220°

[0170] TL=12.50mm

[0171] Fno=1.90

[0172] The data of the lens surface of the wide-angle lens of Example 3 are shown in Table 7 below.

[0173] [Table 7]

[0174]

[0175]

[0176] The aspheric coefficients of the lens surfaces of Example 3 are shown in Table 8 below.

[0177] [Table 8]

[0178] side 3

[0179]K=8.3539E+00, A4=4.4946E-03, A6=-7.8563E-05,

[0180] A8=-2.1150E-05, A10=-2.1291E-06, A12=4.1787E-07,

[0181] A14=4.8739E-08, A16=-1.1313E-08, A18=4.5321E-10

[0182] side 4

[0183] K=-1.5278E+00, A4=3.4118E-02, A6=5.0038E-02,

[0184] A8=-9.2027E-02, A10=1.0117E-01, A12=-5.9380E-02,

[0185] A14=1.8083E-02, A16=-2.2128E-03, A18=0.0000E+00

[0186] side 5

[0187] K=1.4577E+00, A4=-2.9957E-02, A6=2.5317E-03,

[0188] A8=1.2951E-01, A10=-4.3034E-01, A12=6.7620E-01,

[0189] A14=-5.6057E-01, A16=2.3830E-01, A18=-4.0880E-02

[0...

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PUM

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Abstract

The present invention provides a wide-angle lens, a lens unit, and a photographing device that are compact and can ensure good optical performance. The wide-angle lens (10) has 6 lenses, including a front lens group (G1), an aperture stop (ST) and a positive rear lens group (G2) sequentially from the object side, wherein the wide-angle lens satisfies the following conditional formula (1): | f / f1|<0.028...(1). Here, the value f1 is the focal length of the front lens group (G1), and the value f is the focal length of the entire system.

Description

technical field [0001] The invention relates to a wide-angle lens including a front lens group, a diaphragm and a positive rear lens group and having six lenses, a lens unit and a photographing device with the wide-angle lens. Background technique [0002] In recent years, in-vehicle cameras and monitoring cameras have been required to further widen the angle of view, miniaturize, and reduce costs. In addition, in addition to the above requirements, the lens is also required to achieve high optical performance from on-axis to off-axis, and to maintain high performance even in harsh environments. [0003] The optical system described in Patent Document 1 is composed of a front lens group, a diaphragm, and a positive rear lens group in this order from the object side, thereby achieving miniaturization and widening of the angle. However, in the optical system of Patent Document 1, since the magnification (Japanese: power) of the front lens group is too large, large field curva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/00G02B13/18
CPCG02B13/06G02B13/0045G02B13/18
Inventor 地大佳奈
Owner KONICA MINOLTA INC