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Camera lens

A camera lens and lens technology, applied in the field of camera lenses, can solve problems such as too long optical path length

Inactive Publication Date: 2006-03-29
MILESTONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But the distance of the imaging lens disclosed in the above-mentioned patent document from the aperture stop surface to the second surface (surface on the image side) of the second lens is 5.3mm, as the lens installed on the small video camera that adopts CCD or CMOS as the imaging element , the optical path length is too long

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Experimental program
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Embodiment

[0062] figure 1 It is a structural diagram of the imaging lens of the present invention. In order from the object side to the image side, they are the first and second lenses, respectively, L 1 with L 2 express. The imaging surface (the light-receiving surface of the solid-state imaging element) is denoted by 10, the protective glass separating the imaging surface and the lens group is denoted by 12, and constitutes the second diaphragm S 2 The two planes from the image side to the object side are denoted by 14 and 16 in sequence, forming the aperture stop S 1 The aperture surface of the is recorded as 18.

[0063] r shown in this figure i (i=1, 2, 3, ... 9) and d i (i=1, 2, 3, . . . 9) and other specific values ​​of the parameters are given in the following Tables 1-4. Subscripts 1, 2, . . . , 9 are attached in order from the object side to the image side corresponding to the surface numbers of the lenses or the thickness of the lenses or the intervals between the lens...

no. 1 example

[0106] (A) The focal length of the entire lens system is f=3.296mm

[0107] (B) The focal length f of the first lens 1 =3.13mm

[0108] (C) The focal length f of the second lens 2 =-17.63mm

[0109] (D) The object side curvature radius r of the first lens 1 =-15.3122mm

[0110] (E) Image-side curvature radius r of the first lens 2 =-1.5519mm

[0111] (F) The distance D from the position of the aperture stop to the second surface of the second lens = 2.83 mm. then

[0112] (1)|f 1 / f 2 |=|3.13 / -17.63|=0.1775≈0.18

[0113] (2)|r 1 / f|=|-15.3122 / 3.296|=4.646≈4.65

[0114] (3)|r 1 / r 2 |=|-15.3122 / -1.5519|=9.867≈9.87

[0115] (4) D / f=2.83 / 3.296=0.8565≈0.86

[0116] Thus the lens group of the first embodiment satisfies all of the following conditional expressions (1)-(4).

[0117] 0.091 / f 2 |<0.37 (1)

[0118] 1.331 / f|<47.77 (2)

[0119] 3.081 / r 2 |<113.12 (3)

[0120] 0.63

[0121] When referring to the conditional formula hereinafter, all re...

no. 2 example

[0130] (A) The focal length of the entire lens system is f=3.74mm

[0131] (B) The focal length f of the first lens 1 =3.98mm

[0132] (C) The focal length f of the second lens 2 =-38.88mm

[0133] (D) The object side curvature radius r of the first lens 1 =-4.9982mm

[0134] (E) Image-side curvature radius r of the first lens 2 =-1.6179mm

[0135] (F) The distance D from the position of the aperture stop to the second surface of the second lens = 2.40 mm. then

[0136] (1)|f 1 / f 2 |=|3.98 / -38.38|=0.104≈0.10

[0137] (2)|r 1 / f|=|-4.9982 / 3.74|=0.1336≈1.34

[0138] (3)|r 1 / r 2 |=|-4.9982 / -1.6179|=3.089≈3.09

[0139] (4) D / f=2.40 / 3.74=0.6417≈0.64

[0140] Thus the lens group of the second embodiment satisfies all of the following conditional expressions (1)-(4).

[0141] 0.091 / f 2 |<0.37 (1)

[0142] 1.331 / f|<47.77 (2)

[0143] 3.081 / r 2 |<113.12 (3)

[0144] 0.63

[0145] Aperture stopS 1 As shown in Table 2, set at 0.10 mm from the fro...

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Abstract

An image pickup lens is provided in which various aberrations are satisfactorily corrected, and the optical length is not more than 6 mm, and moreover a sufficient back focus is secured. This image pickup lens is configured by arranging, in order from the object side, an aperture diaphragm (S1); a first lens (L1) having a meniscus shape with concave surface facing the object side, and having positive refractive power; a second diaphragm (S2) and a second lens (L2) having a meniscus shape with concave surface facing the image side, and having negative refractive power. The aperture diaphragm (S1) forms an incidence plane. The second diaphragm (S2) provided between the first lens (L1) and the second lens (L2) is inserted in order to cut out so-called flare, which is light which strikes the peripheral edge of a lens or similar and is irregularly reflected.

Description

technical field [0001] The present invention relates to an imaging lens suitable for being mounted on a video camera with CCD or CMOS as an imaging element. Background technique [0002] A lens mounted on a small camera with a CCD or CMOS image sensor needs to have a short optical path length. As such a lens, there is, for example, an imaging lens disclosed in JP-A-10-206730. [0003] But the distance of the imaging lens disclosed in the above-mentioned patent document from the aperture stop surface to the second surface (surface on the image side) of the second lens is 5.3mm, as the lens installed on the small video camera that adopts CCD or CMOS as the imaging element , the optical path length is too long. In addition, in the imaging lens unit disclosed in this patent document, the aperture stop is inserted between the first lens and the second lens, that is, in the imaging lens unit disclosed in this document, the diaphragm is provided on only one surface. [0004] It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/02G02B9/10G02B1/04G02B13/00
CPCG02B13/18G02B13/003G02B13/02G02B9/10
Inventor 堂智
Owner MILESTONE CO LTD