Optical encoder with contamination detection
An optical unit includes an optical emitter receiving an optical emitter current, an optical sensor receiving an optical sensor current and light from the optical emitter and in response thereto outputting at least one signal indicating relative movement between the optical unit and an optical code...
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| creator | CHIN YEE L CHEONG JIIN C |
| description | An optical unit includes an optical emitter receiving an optical emitter current, an optical sensor receiving an optical sensor current and light from the optical emitter and in response thereto outputting at least one signal indicating relative movement between the optical unit and an optical code scale, and an optical sensor current detector comparing the optical sensor current to a reference value. In response to the optical sensor current being different than the reference value, the optical sensor current detector outputs an optical sensor current detector signal. The optical sensor current detector signal indicates the presence of a contaminant in a light path from the optical emitter to the optical sensor, and is used to regulate the current to the optical emitter so as to counteract the negative effects of the contaminant in the light path. |
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In response to the optical sensor current being different than the reference value, the optical sensor current detector outputs an optical sensor current detector signal. The optical sensor current detector signal indicates the presence of a contaminant in a light path from the optical emitter to the optical sensor, and is used to regulate the current to the optical emitter so as to counteract the negative effects of the contaminant in the light path.</description><language>eng</language><subject>ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS ; CALCULATING ; COMPUTING ; COUNTING ; HANDLING RECORD CARRIERS ; MEASURING ; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE ; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR ; PHYSICS ; PRESENTATION OF DATA ; RECOGNITION OF DATA ; RECORD CARRIERS ; TARIFF METERING APPARATUS ; TESTING</subject><creationdate>2007</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20070531&DB=EPODOC&CC=US&NR=2007119933A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20070531&DB=EPODOC&CC=US&NR=2007119933A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>CHIN YEE L</creatorcontrib><creatorcontrib>CHEONG JIIN C</creatorcontrib><title>Optical encoder with contamination detection</title><description>An optical unit includes an optical emitter receiving an optical emitter current, an optical sensor receiving an optical sensor current and light from the optical emitter and in response thereto outputting at least one signal indicating relative movement between the optical unit and an optical code scale, and an optical sensor current detector comparing the optical sensor current to a reference value. In response to the optical sensor current being different than the reference value, the optical sensor current detector outputs an optical sensor current detector signal. The optical sensor current detector signal indicates the presence of a contaminant in a light path from the optical emitter to the optical sensor, and is used to regulate the current to the optical emitter so as to counteract the negative effects of the contaminant in the light path.</description><subject>ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS</subject><subject>CALCULATING</subject><subject>COMPUTING</subject><subject>COUNTING</subject><subject>HANDLING RECORD CARRIERS</subject><subject>MEASURING</subject><subject>MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE</subject><subject>MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR</subject><subject>PHYSICS</subject><subject>PRESENTATION OF DATA</subject><subject>RECOGNITION OF DATA</subject><subject>RECORD CARRIERS</subject><subject>TARIFF METERING APPARATUS</subject><subject>TESTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2007</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZNDxLyjJTE7MUUjNS85PSS1SKM8syVBIzs8rSczNzEssyczPU0hJLUlNBrF4GFjTEnOKU3mhNDeDsptriLOHbmpBfnxqcUFicmpeakl8aLCRgYG5oaGlpbGxo6ExcaoAZnwrKA</recordid><startdate>20070531</startdate><enddate>20070531</enddate><creator>CHIN YEE L</creator><creator>CHEONG JIIN C</creator><scope>EVB</scope></search><sort><creationdate>20070531</creationdate><title>Optical encoder with contamination detection</title><author>CHIN YEE L ; CHEONG JIIN C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US2007119933A13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2007</creationdate><topic>ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS</topic><topic>CALCULATING</topic><topic>COMPUTING</topic><topic>COUNTING</topic><topic>HANDLING RECORD CARRIERS</topic><topic>MEASURING</topic><topic>MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE</topic><topic>MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR</topic><topic>PHYSICS</topic><topic>PRESENTATION OF DATA</topic><topic>RECOGNITION OF DATA</topic><topic>RECORD CARRIERS</topic><topic>TARIFF METERING APPARATUS</topic><topic>TESTING</topic><toplevel>online_resources</toplevel><creatorcontrib>CHIN YEE L</creatorcontrib><creatorcontrib>CHEONG JIIN C</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>CHIN YEE L</au><au>CHEONG JIIN C</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Optical encoder with contamination detection</title><date>2007-05-31</date><risdate>2007</risdate><abstract>An optical unit includes an optical emitter receiving an optical emitter current, an optical sensor receiving an optical sensor current and light from the optical emitter and in response thereto outputting at least one signal indicating relative movement between the optical unit and an optical code scale, and an optical sensor current detector comparing the optical sensor current to a reference value. In response to the optical sensor current being different than the reference value, the optical sensor current detector outputs an optical sensor current detector signal. The optical sensor current detector signal indicates the presence of a contaminant in a light path from the optical emitter to the optical sensor, and is used to regulate the current to the optical emitter so as to counteract the negative effects of the contaminant in the light path.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS CALCULATING COMPUTING COUNTING HANDLING RECORD CARRIERS MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS TARIFF METERING APPARATUS TESTING |
| title | Optical encoder with contamination detection |
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