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Lens unit

一种透镜单元、透镜的技术，应用在光学元件、光学元件、安装等方向，能够解决没有要求抑制重像等问题，达到防止光学性能降低、抑制重像的效果

Inactive Publication Date: 2020-02-11
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that a flange portion is also formed on each lens after the second lens (on the image side). Although ghosting may occur due to the flange portion of the second lens and subsequent lenses, there is no requirement to suppress the Occurrence of ghosting, etc. caused by the flange part after the second lens

Method used

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  • Lens unit
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0043] figure 1 The whole of the lens unit 1 according to this embodiment is shown, figure 1 (a) is a perspective view, figure 1 (b) is the front view, figure 1 (c) is a longitudinal sectional view. figure 2 It is an exploded perspective view of the lens unit 1 .

[0044] The lens unit 1 is a lens accessory installed in a vehicle peripheral monitoring camera, a monitoring camera, a video intercom doorbell, and the like. It should be noted that the “object side L1” and “image side L2” in the present invention refer to the object side and the image side in the direction of the optical axis L, and the “direction of the optical axis” refers to a direction parallel to the optical axis L.

[0045] (the whole frame)

[0046] The lens unit 1 includes a wide-angle lens 2 composed of a plurality of lenses, and a lens barrel 3 that accommodates the wide-angle lens 2 . The wide-angle lens 2 includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens ...

no. 2 approach ＞

[0082] refer to Figure 7 ~ Figure 9 , the second lens 22a of this embodiment will be described. In the second lens 22 a of the present embodiment, the shape of the boundary portion between the image side flange surface inner peripheral portion 61 and the image side lens surface 69 is different from that of the first embodiment. Hereinafter, parts different from those of the first embodiment will be mainly described, and descriptions of the same configurations / functions will be appropriately omitted. Figure 7 is a perspective view of the second lens 22a, Figure 7 (a) shows the whole of the second lens 22a, Figure 7 (b) is a sectional perspective view. Figure 8 It is a plan view showing the surface of the image side L2 of the second lens 22a. Figure 9 is the boundary portion ( Figure 7 Zoomed-in view of region Z) in Figure 9 (a) shows the state where the ink 90 is applied, Figure 9 (b) shows the state where the ink 90 is applied in the configuration in which the ...

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PUM

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Abstract

Provided is a lens unit capable of suppressing ghosting caused by the flange of a second lens, and preventing a decline in optical performance by blackening the flange section that surrounds the lenssurface of the second lens. A second lens 22 is provided with a flange section 52 that surrounds a lens surface. An image-side flange surface 54 has an image-side flange surface inner-circumferentialsection 61 which is shaped like a ring-shaped groove, and also has a ring-shaped image-side flange surface outer-circumferential section 62 formed to the outside of the inner-circumferential section 61. The image-side flange surface inner-circumferential section 61 is coated with black ink 90. The image-side flange surface outer-circumferential section 62 is provided with boss-shaped positioning surfaces 63 at six equidistant locations along the outer circumference. Ejector pin contact sections 64 are formed between adjacent positioning surfaces 63, and said contact sections 64 contact the ejector pins at the time of separation from the mold during resin molding.

Description

technical field [0001] The present invention relates to a lens unit including a plurality of lenses and a lens barrel holding them. Background technique [0002] In some lens units, a light-shielding film (light-shielding layer) is formed on the outer peripheral portion surrounding the lens surface from the radially outer side to prevent incident and reflection of unnecessary light (see Patent Documents 1 and 2). [0003] When holding the lens on the lens barrel (lens barrel), the lens can be easily held on the lens barrel by forming a flange portion on the lens. On the other hand, since the flange portion is formed, unnecessary light incident on the flange portion overlaps with original effective light, thereby possibly causing a ghost image or a reflection spot. [0004] Therefore, there is a configuration in which ink as a light-shielding film is applied to the flange surface of the first lens disposed on the most object side. It should be noted that a flange portion is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/02B29D11/00
CPCB29D11/00G02B7/021G02B7/022G02B27/0018G02B1/041G02B1/10G02B13/004
Inventor 神崎阳介
Owner SANKYO SEIKI MFG CO LTD