초록 ▼

A system for protecting optical elements from moisture and/or ice build up when used in freezing environment, such as a freezer compartment of a refrigerator. The system includes a hood or sleeve which can be assembled to an optical element such as a light emitting or receiving elements used in a fr

A system for protecting optical elements from moisture and/or ice build up when used in freezing environment, such as a freezer compartment of a refrigerator. The system includes a hood or sleeve which can be assembled to an optical element such as a light emitting or receiving elements used in a freezer compartment. The sleeve acts to trap air about the optic element such that warm humid air does not readily move into contact with the optic element. Moreover, the warm, humid air that does flow toward the optic element may be cooled by the sleeve such that moisture condenses out of the air and onto the sleeve. A heater may be provided adjacent the sleeve for heating the sleeve if the optic element is impaired due to ice or moisture build up.

대표청구항 ▼

1. An optical system for sensing the level of contents within a container which is disposed within a freezing environment, the system comprising:a light emitting element for generating a light signal, the light emitting element including a light emitting lens for directing the light signal across an

1. An optical system for sensing the level of contents within a container which is disposed within a freezing environment, the system comprising:a light emitting element for generating a light signal, the light emitting element including a light emitting lens for directing the light signal across an upper portion of the container; a light receiving clement for receiving the light signal emitted by the light emitting element, the light receiving element having a light receiving lens; a first sleeve disposed about the light emitting lens; and a second sleeve disposed about the light receiving lens, wherein the sleeves act to prevent moisture from condensing onto the light emitting and receiving elements.