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lens unit

A lens unit and lens technology, applied in optical components, instruments, installation, etc., can solve the problems of waterproof performance degradation, O-ring distortion, looseness, etc., to prevent falling off or biting, high reliability, and high sealing Effect

Active Publication Date: 2018-04-03
NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after assembling the lens and the O-ring to the lens holder, there is also a concern that the assembly position of the O-ring in the groove will deviate and the O-ring will Distortion, twisting, loosening, etc., the waterproof performance will decrease

Method used

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Embodiment Construction

[0062] Hereinafter, embodiments of the lens unit according to the present invention will be described in detail using the drawings. The lens unit 1 of the present embodiment has a wide-angle lens, and is a lens assembly incorporated into a vehicle-mounted peripheral monitoring camera. In addition, the "object side" and "image side" in the present invention refer to figure 1 On the object side and the image side in the direction of the optical axis L shown, "axial" refers to a direction parallel to the optical axis L, and "radial" refers to a direction perpendicular to the optical axis L.

[0063] (the whole frame)

[0064] Such as figure 1 As shown, the lens unit 1 is composed of a wide-angle lens 2 , a diaphragm 7 , an optical filter 8 , an O-ring 4 which is a rubber ring-shaped sealing member, and a lens holder 3 holding these members. The wide-angle lens 2 is composed of three lenses, namely, a first lens 21 , a second lens 22 and a third lens 23 arranged along the optic...

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PUM

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Abstract

The present invention provides a lens unit capable of preventing a sealing member from coming off and being bitten when a plastic lens is assembled, and also capable of preventing deterioration of waterproof performance due to distortion, twisting, loosening, etc. of the sealing member after assembly. The first lens, which is the lens arranged on the most object side, is a plastic lens, and a small-diameter portion whose outer diameter decreases stepwise is formed on the image side of the first lens. Between the inner peripheral surface of the lens holder facing the outer peripheral surface of the part, that is, the opposing surface, a sealing member accommodating portion for filling the gap of the sealing member is provided, and the inner surface of the lens holder that divides the sealing member accommodating portion is formed. There is a seal member drop-off preventing portion that protrudes into the seal member accommodating portion to narrow a gap on the image side of the seal member accommodating portion, thereby restricting movement of the seal member toward the image side.

Description

technical field [0001] The present invention relates to a lens unit, and more specifically, to a lens unit having a drop-off preventing structure of a sealing member. Background technique [0002] Patent Document 1 below discloses a lens unit having a drop-off preventing structure of an O-ring. In the lens unit of the following patent document 1, an O-ring is mounted on the small-diameter part (11a) of the lens (11) arranged on the most object side among the plurality of lenses, and the outer peripheral surface of the small-diameter part (11a) is arranged to face Like an inclined surface expanding laterally and radially outward, the O-ring is prevented from being deviated toward the image side. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2011-059396 [0004] The on-vehicle perimeter monitoring camera installed outside the vehicle to capture the surrounding conditions of the vehicle is used under harsh environmental conditions such as wind, rain, and dust. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/02
CPCG02B7/021G02B1/041G02B7/026G02B7/028
Inventor 中岛知昭
Owner NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION