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一种摄像镜头、透镜的技术，应用在摄像镜头领域，达到高分辨率、低F值的效果
Inactive Publication Date: 2018-10-23
KANTATSU CO LTD
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Abstract
Description
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Problems solved by technology
However, in conventional lens systems, it has been difficult to reduce the size at low cost while achieving wide-angle widening and high optical performance to the extent required in recent years
Method used
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Examples
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Embodiment 1
[0155] Basic lens data are shown in Table 1 below.
[0156] [Table 1]
[0157] Example 1
[0158] unit mm
[0159] f=0.91
[0160] Fno=2.0
[0161] ω(°)=103.3
[0162] ih=1.85
[0163] TTL=12.78
[0164] surface data
[0165]
[0166] Composition Lens Data
[0167]
[0168] Aspheric data
[0169]
[0170] The imaging lens of Example 1 satisfies conditional expressions (1) to (10) as shown in Table 9.
[0171] figure 2 For the imaging lens of Example 1, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. The spherical aberration diagram shows the amount of aberration for each wavelength of F-line (486 nm), d-line (588 nm), and C-line (656 nm). In addition, the astigmatism diagram shows the aberration amount (solid line) on the d-line on the sagittal image plane S and the aberration amount (dotted line) on the d-line on the meridian image plane T (dotted line) ( Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 12 , Figu...
Embodiment 2
[0173] Basic lens data are shown in Table 2 below.
[0174] [Table 2]
[0175] Example 2
[0176] unit mm
[0177] f=0.87
[0178] Fno=2.0
[0179] ω(°)=102.5
[0180] ih=1.85
[0181] TTL=12.45
[0182] surface data
[0183]
[0184] Composition Lens Data
[0185]
[0186] Aspheric data
[0187]
[0188] The imaging lens of Example 2 satisfies conditional expressions (1) to (10) as shown in Table 9.
[0189] Figure 4 For the imaging lens of Example 2, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Such as Figure 4 As shown, it can be seen that various aberrations are well corrected.
Embodiment 3
[0191] Basic lens data are shown in Table 3 below.
[0192] [table 3]
[0193] Example 3
[0194] unit mm
[0195] f = 0.90
[0196] Fno=2.0
[0197] ω(°)=101.7
[0198] ih=1.85
[0199] TTL=12.77
[0200] surface data
[0201]
[0202] Composition Lens Data
[0203]
[0204] Aspheric data
[0205]
[0206] The imaging lens of Example 3 satisfies conditional expressions (1) to (10) as shown in Table 9.
[0207] Figure 6 For the imaging lens of Example 3, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Such as Figure 6 As shown, it can be seen that various aberrations are well corrected.
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Abstract
The invention provides an imaging lens that well corrects various aberrations and has a high resolution while meeting the requirements of wide angle, low back, and low F value in a well-balanced manner. The imaging lens includes: a first lens having a convex surface facing an object side in the vicinity of an optical axis and having a negative focal power; a second lens having a negative focal power; a third lens; a fourth lens having a biconvex shape in the vicinity of the optical axis; and a fifth lens being disposed in such a manner that the lenses are not joined from the first lens to thefifth lens, and satisfying the conditional expression (1). (1) 0.50<r5 / r6<12.50 wherein r5: the radius of curvature of the surface on an object side of the third lens, and r6: the radius of curvatureof the surface on an image side of the third lens.
Description
technical field [0001] The present invention relates to an imaging lens for imaging a subject on a solid-state imaging element of a CCD sensor or a C-MOS sensor used in an imaging device, and in particular to a smart phone, Imaging lenses built into imaging devices mounted on mobile phones, surveillance cameras, and automobiles. Background technique [0002] In recent years, many information devices have been equipped with camera functions. In addition, imaging elements constituting imaging devices such as surveillance cameras and vehicle-mounted cameras are becoming smaller and more pixel-intensive year by year, and accordingly, imaging lenses are also required to be smaller in size and higher in performance. [0003] For imaging lenses used in surveillance cameras and in-vehicle cameras, there is an increasing demand for wider angles of view. For example, a full field of view of 180 degrees or more is desired. On this basis, it is hoped that the camera lens will be clear...
Claims
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Application Information
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