Optical device and imaging device with mechanism for reducing condensation

摘要

In an optical device, a lens assembly includes a lens for receiving light and a holder for holding the lens. A circuit board performs at least one process based on the received light. A housing has an opening and is configured to house the lens assembly and the circuit board therein such that at least part of the circuit board faces the lens assembly, and the lens assembly is exposed via the opening. A mechanism for defining a passage located around the lens assembly to communicate with the opening. The passage guides air, entering an inside of the housing via the opening, so as not to be directed toward the circuit board.

主权项

1. An optical device comprising:
a lens assembly comprising at least one lens for receiving light and a holder for holding the at least one lens; a circuit board for performing at least one process based on the received light; a housing having an opening and configured to house the lens assembly and the circuit board therein such that at least part of the circuit board faces the lens assembly, and the lens assembly is exposed via the opening; and means defining a passage located around the lens assembly to communicate with the opening, the passage guiding air, entering an inside of the housing via the opening, so as not to be directed toward the circuit board; wherein the holder has a substantially tubular shape, and is configured to surround at least part of the lens assembly to hold the lens assembly, and the defining means is configured to define the passage between the holder and an inner surface of the housing.