The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
Described herein is a method for increasing tolerance to contaminating dust particles in an optical compact disc drive, such as a CD-ROM or other dust-sensitive device.
English (United States)
This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately
52% of the total text.
Dust Entrapment Design for Optical Path
herein is a method for increasing tolerance to
contaminating dust particles in an optical compact disc drive, such
as a CD-ROM or other dust-sensitive device.
state-of-the-art CD-ROM has a cover or shield as a partial
barrier to contamination of its optical system. However dust gets in
through the aperture in the lens cover, penetrates further into the
inner optical system, and contaminates the interior functional
laser-optic surfaces. This causes premature failure of CD-ROM drives
and of similar optical equipment. Using
boundary entrapment, passive
collection of dust can be achieved in areas where classical air
filtration methods cannot be deployed.
Fig. A, because the lens opening 1 in an optical
shield 2 cannot be closed over or sealed, airborne contamination
particles can enter through the lens opening 1.
Below this opening
is a movable upper lens 3 which is mounted to move vertically on a
four-bar linkage 4 and also pivoted (not shown) to swing or rotate
horizontally. This movement tends to
keep the contaminated air in
motion, and dust particles have many opportunities to collide with
and deposit upon both functional (optical) and non-functional
(non-optical) surfaces. Below this
movable upper lens 3 is a
stationary mirror 5 which deflects the laser beam approximately 90
degrees into a horizontal light tube 8. Contamination (dust) which
enters through lens opening 1 finds essentially no seal or barrier
between itself and the interior optical surfaces. Therefore, optical
contamination occurs and de grades the laser-optical signal at the
three exposed optical surfaces which are the bottom side 3B of the
upper lens 3, the mirror 5, and the face 7 of the light tube 8.
Only the upper surface 3A of the upper lens 3 is cleanable by the
device operator, by using a commercially-available cleaning disk that