OPTICAL DEVICE

PROBLEM TO BE SOLVED: To securely suppress noise by reflecting emission light from a laser element in an optical system, by returning a part of the reflected light to the laser element through light path, and by setting the self-excited oscillation frequency of the laser element being determined by...

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1. Verfasser:	UKITA SHOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS DEVICES USING STIMULATED EMISSION ELECTRICITY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
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creator	UKITA SHOICHI
description	PROBLEM TO BE SOLVED: To securely suppress noise by reflecting emission light from a laser element in an optical system, by returning a part of the reflected light to the laser element through light path, and by setting the self-excited oscillation frequency of the laser element being determined by the influence of the returned reflected light so that specific conditions are met. SOLUTION: Light emitted from a semiconductor laser element 1 enters a beam splitter 5 via a coupling lens 4, and, furthermore, enters the recording surface of an optical disk 3 via an objective lens 6. Reflected light that picks up information on the recording surface of the optical disk 3 returns to the beam splitter 5 via the objective lens 6 again, and one part of the reflected light enters a photo detector 8 via a sensor lens 7. On the other hand, remaining reflected light returns to a laser element 1 through a light path length, a self-excited oscillation frequency fsp of the laser element 1 being determined by the influence of the returned reflected light is set so that (m-0.25).(c/2 Lex)
format	Patent
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SOLUTION: Light emitted from a semiconductor laser element 1 enters a beam splitter 5 via a coupling lens 4, and, furthermore, enters the recording surface of an optical disk 3 via an objective lens 6. Reflected light that picks up information on the recording surface of the optical disk 3 returns to the beam splitter 5 via the objective lens 6 again, and one part of the reflected light enters a photo detector 8 via a sensor lens 7. On the other hand, remaining reflected light returns to a laser element 1 through a light path length, a self-excited oscillation frequency fsp of the laser element 1 being determined by the influence of the returned reflected light is set so that (m-0.25).(c/2 Lex) <= fsp <=m.(c/2 Lex) is met.</description><edition>7</edition><language>eng</language><subject>BASIC ELECTRIC ELEMENTS ; DEVICES USING STIMULATED EMISSION ; ELECTRICITY ; INFORMATION STORAGE ; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER ; PHYSICS</subject><creationdate>2000</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=20000815&DB=EPODOC&CC=JP&NR=2000228559A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25563,76418</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000815&DB=EPODOC&CC=JP&NR=2000228559A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>UKITA SHOICHI</creatorcontrib><title>OPTICAL DEVICE</title><description>PROBLEM TO BE SOLVED: To securely suppress noise by reflecting emission light from a laser element in an optical system, by returning a part of the reflected light to the laser element through light path, and by setting the self-excited oscillation frequency of the laser element being determined by the influence of the returned reflected light so that specific conditions are met. SOLUTION: Light emitted from a semiconductor laser element 1 enters a beam splitter 5 via a coupling lens 4, and, furthermore, enters the recording surface of an optical disk 3 via an objective lens 6. Reflected light that picks up information on the recording surface of the optical disk 3 returns to the beam splitter 5 via the objective lens 6 again, and one part of the reflected light enters a photo detector 8 via a sensor lens 7. On the other hand, remaining reflected light returns to a laser element 1 through a light path length, a self-excited oscillation frequency fsp of the laser element 1 being determined by the influence of the returned reflected light is set so that (m-0.25).(c/2 Lex) <= fsp <=m.(c/2 Lex) is met.</description><subject>BASIC ELECTRIC ELEMENTS</subject><subject>DEVICES USING STIMULATED EMISSION</subject><subject>ELECTRICITY</subject><subject>INFORMATION STORAGE</subject><subject>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</subject><subject>PHYSICS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2000</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZODzDwjxdHb0UXBxDfN0duVhYE1LzClO5YXS3AxKbq4hzh66qQX58anFBYnJqXmpJfFeAUYGBgZGRhamppaOxkQpAgD20R1H</recordid><startdate>20000815</startdate><enddate>20000815</enddate><creator>UKITA SHOICHI</creator><scope>EVB</scope></search><sort><creationdate>20000815</creationdate><title>OPTICAL DEVICE</title><author>UKITA SHOICHI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2000228559A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2000</creationdate><topic>BASIC ELECTRIC ELEMENTS</topic><topic>DEVICES USING STIMULATED EMISSION</topic><topic>ELECTRICITY</topic><topic>INFORMATION STORAGE</topic><topic>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</topic><topic>PHYSICS</topic><toplevel>online_resources</toplevel><creatorcontrib>UKITA SHOICHI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>UKITA SHOICHI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>OPTICAL DEVICE</title><date>2000-08-15</date><risdate>2000</risdate><abstract>PROBLEM TO BE SOLVED: To securely suppress noise by reflecting emission light from a laser element in an optical system, by returning a part of the reflected light to the laser element through light path, and by setting the self-excited oscillation frequency of the laser element being determined by the influence of the returned reflected light so that specific conditions are met. SOLUTION: Light emitted from a semiconductor laser element 1 enters a beam splitter 5 via a coupling lens 4, and, furthermore, enters the recording surface of an optical disk 3 via an objective lens 6. Reflected light that picks up information on the recording surface of the optical disk 3 returns to the beam splitter 5 via the objective lens 6 again, and one part of the reflected light enters a photo detector 8 via a sensor lens 7. On the other hand, remaining reflected light returns to a laser element 1 through a light path length, a self-excited oscillation frequency fsp of the laser element 1 being determined by the influence of the returned reflected light is set so that (m-0.25).(c/2 Lex) <= fsp <=m.(c/2 Lex) is met.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record>
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subjects	BASIC ELECTRIC ELEMENTS DEVICES USING STIMULATED EMISSION ELECTRICITY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
title	OPTICAL DEVICE
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