Browse Prior Art Database

Light Beam Duct

IP.com Disclosure Number: IPCOM000121796D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Related People

Rachui, RA: AUTHOR

Abstract

Described is a method where dust accumulation is significantly reduced around the drive head area of a laser read/write device.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Light Beam Duct

      Described is a method where dust accumulation is significantly
reduced around the drive head area of a laser read/write device.

      The drive head area of a laser read/write device basically
consists of a focus lens (1), mirror (2) directional structure, and a
light emitter (3).  Dust accumulation on any one or combination will
cause failure of the device.  Presently the focus lens (1) is cleaned
periodically by use of a cleaning disk.  But dust accumulation on the
mirror and/or light emitter lens is the major cause of device
failure.

      The light path from the emitter (3) to the focus lens (1) is
circumscribed by a duct (4).  The directional mirror (2) for the
light beam (5) is attached to this duct (4) in some fashion, whereby
the duct provides enclosure of the emitter lens and mirror from
outside elements.  Access to the mirror (2) and emitter lens by dust
would be only by way of a small gap (6) between the underside of the
focus lens (1) and edge of the duct (7).  Plus the interior of the
duct walls are coated with a tacky substance, whereby any dust
entering though the described gap would attach on to this tacky
substance.

      Disclosed anonymously.