LENS UNIT

• Main Authors: YAMADA CHOJI, NAKAJIMA TOMOAKI
• Format: Patent
• Language: English; Japanese
• Published: 05.04.2018
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a lens unit capable of improving waterproof performance by preventing entering of water from a gap between a first lens and a swaging part.SOLUTION: In a lens unit 1, a first lens 11, of a plurality of lenses housed in a resin lens holder 7, closest to an object side L1 is fixed by a swaging part 77 that protrudes radially inward at an end of the lens holder 7 and covers an outer peripheral side end 115 of the first lens 11 from the object side L1. The first lens 11 is a plastic lens. A first surface 111 on the object side L1 of the first lens 11 is formed with a rough surface 113 having irregularities 113a in a part overlapping with the swaging part 77. The swaging part 77 bites into the irregularities 113a. Thus, water having entered a gap between the first lens 11 and the swaging part 77 can be blocked by biting between the rough surface 113 (the irregularities 113a) of the first lens 11 and the swaging part 77.SELECTED DRAWING: Figure 2 【課題】第１レンズとカシメ部との間からの水の侵入を抑制することにより、防水性能を向上することのできるレンズユニットを提供すること。【解決手段】レンズユニット１において、樹脂製のレンズホルダ７に収容された複数のレンズのうち、最も物体側Ｌ１の第１レンズ１１は、レンズホルダ７の端部で径方向内側に張り出して第１レンズ１１の外周側端部１１５に物体側Ｌ１から被さるカシメ部７７によって固定されている。第１レンズ１１はプラスチックレンズであり、第１レンズ１１の物体側Ｌ１の第１面１１１には、カシメ部７７と重なる部分に、凹凸１１３ａを備えた粗面１１３が形成され、カシメ部７７は、凹凸１１３ａに食い込んでいる。従って、第１レンズ１１とカシメ部７７との間に侵入した水を第１レンズ１１の粗面１１３（凹凸１１３ａ）とカシメ部７７との食い込みによって堰き止めることができる。【選択図】図２