Browse Prior Art Database

Clean Rotating Mirror System

IP.com Disclosure Number: IPCOM000084383D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Lambiotte, JC: AUTHOR [+2]

Abstract

In a rotating mirror system such as described in United States Patent 3,835,249, the spindle assembly used to support the mirror must of course include a spindle bearing. The disc-like mirror, mounted at the end of the shaft or spindle, tends to create a low-pressure zone which draws lubricant vapors and the like along the shaft, to the mirror, causing its reflective surfaces to contaminate.

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Clean Rotating Mirror System

In a rotating mirror system such as described in United States Patent 3,835,249, the spindle assembly used to support the mirror must of course include a spindle bearing. The disc-like mirror, mounted at the end of the shaft or spindle, tends to create a low-pressure zone which draws lubricant vapors and the like along the shaft, to the mirror, causing its reflective surfaces to contaminate.

Fig. 1 shows the use of a larger diameter rotating diverter disc 10, immediately adjacent rotating mirror 11, to prevent deposit on the mirror's facets 12, caused by airflow 13 from the bearings within spindle housing 14.

Fig. 2 shows an arrangement wherein mirror 11 and its spindle housing 14 are enclosed in housing 15. A stationary nozzle 16 is closely spaced adjacent mirror 11 and converts the velocity pressure of the mirror surface boundary layer air to a static pressure that is greater than atmospheric pressure. This induces an airflow, as indicated by arrows 18, out of enclosure 15 through spindle housing 14 while it is being replaced through filter 17.

Fig. 3 is similar to Fig. 2 in that housing 15 and filter 17 are provided. In this structure, the airflow into the housing is induced by the pumping action of rotating mirror 11 and closely spaced stationary disc 19. As a result, airflow is induced through conduit 20 and flows radially outward over the top of the mirror 11. Again the air exits housing 15 after passing through spindle housing...