| CPC G03B 17/12 (2013.01) [G02B 7/021 (2013.01); G02B 7/025 (2013.01); G02B 7/026 (2013.01)] | 20 Claims |
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1. A lens unit, comprising:
a first lens, arranged on an object side in an optical axis direction along an optical axis;
a plurality of lenses, including a second lens adjacent to the first lens on an image side in the optical axis direction;
a lens barrel, comprising:
a first accommodating portion to accommodate the first lens;
a second accommodating portion to accommodate the plurality of the lenses; and
an outer peripheral groove, provided on an outside of the second accommodating portion when viewed from the optical axis, and the outer peripheral groove is provided in an annular shape around the optical axis;
a first seal member to seal between the first lens and the first accommodating portion of the lens barrel;
a second seal member, comprising an adhesive, to seal between the second lens and the second accommodating portion of the lens barrel so that the moisture of the air in a space inside the second accommodating portion of the lens barrel is prevented from flowing into a first space that is located between the first lens and the second lens,
wherein a communication passage is provided in the lens barrel and is disposed on the object side of the outer peripheral groove, and
the communication passage connects the first space and a second space located at an opening of the lens barrel to the outer peripheral groove, so that the air in the first space moves out of the lens barrel via the communication passage and the outer peripheral groove; and
a third seal member to close the communication passage is provided in the communication passage.
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