| CPC G02B 7/025 (2013.01) [G02B 7/021 (2013.01); G02B 23/243 (2013.01); H04N 23/54 (2023.01)] | 17 Claims |
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1. A lens unit comprising:
a lens including
a lens part that is formed at a center of the lens, and
a flange part that extends radially outward from a periphery of the lens part, the flange part including a rear end surface on its rear side;
a transparent spacer that is disposed behind the lens in an optical axis direction and used for focusing the lens part, the spacer including
a front end surface that opposes to a rear of the lens,
a spaced-apart part that opposes to the lens part and is spaced apart rearward in the optical axis direction from the lens part, and
a bonded peripheral part that extends radially outward from a periphery of the spaced-apart part;
an adhesive that is disposed between the rear end surface of the flange part and the bonded peripheral part and bonds the lens and the spacer;
a transparent sensor-dedicated cover member that is disposed behind the spacer in the optical axis direction; and
a third adhesive that bonds the spacer and the sensor-dedicated cover member;
a holder that includes housing space for housing the lens and the spacer, the housing space having a circular radial cross-sectional shape; and
a filler that fills up between the lens and the spacer housed in the housing space and the inner circumferential surface of the holder;
wherein the third adhesive is different in refractive index from the spacer and the sensor-dedicated cover member by 0.1 or less, and
a maximum inner diameter of the housing space is 0.4 mm to 2 mm.
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