Window mounting for optical sensor

#1. Field of the Invention

#The present invention relates to optical sensors and, more particularly, to mounting of a window over an optical sensor.

#2. Brief Description of Prior Developments

#The foregoing aspects and other features of the present invention are explained in the following description, taken in connection with the accompanying drawings, wherein:

#FIG. 1 is a partial cross sectional view of an optical sensor cover system incorporating features of the present invention;

#FIG. 2 is a partial enlarged cross sectional view of an area of the cover system shown in FIG. 1;

#Referring to FIG. 1, there is shown a partial cross sectional view of an optical sensor system incorporating features of the present invention. Although the present invention will be described with reference to the exemplary embodiments shown in the drawings, it should be understood that the present invention can be embodied in many alternate forms of embodiments. In addition, any suitable size, shape or type of elements or materials could be used.

#The system generally comprises a window 10, a sensor housing 11, an optics housing 12, and a removable retention ring 18. Optics housing 12 includes lens element 13 and 14, and other components not illustrated. Optics housing 12 mounts within a central opening in sensor housing 11, and is held in alignment by face 15 and inside diameter 16, or by other means not critical to this invention. Elastomeric “O-ring” 17 seals the interior of the optics assembly against dust and moisture, by pressing against sensor housing 11 and optics housing 12. These details of mounting the optic are not critical to this invention, so other designs can be used without conflicting with the principles of this invention.

#Window element 10 is attached to the sensor housing 11 by a removable connection that comprises retention ring 18, seal member 19, and fastener 20. Multiple fasteners 20 are located at several places about the diameter of retention ring 18, and hold window 10 firmly against optics housing 12 and seal member 19. Fasteners 20 engage the sensor housing 11, within which optics housing 12 is mounted. The seal member 19 is preferably a flexible or elastomeric O-ring. However, in an alternate embodiment, any suitable type of seal member could be provided. Retention ring 18 is sized and shaped to receive the O-ring seal 19 therein. As flange 18 presses the O-ring seal 19 against both window 10 and sensor housing 11, a seal is created against dust and moisture intrusion.