{"id":13737,"date":"2024-05-17T11:39:40","date_gmt":"2024-05-17T10:39:40","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13737"},"modified":"2024-05-18T09:27:01","modified_gmt":"2024-05-18T08:27:01","slug":"13737","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13737","title":{"rendered":"CDM 12"},"content":{"rendered":"<p><strong>The CDM 12.1 is a modular CD-mechanism, using a 2-stage, 3-spot system. It contains the following modules:<\/strong><\/p>\n<p>\u2022 a lightpen with holographic lightpath. (LDGU:Laser Diode and Grating Unit)<\/p>\n<ul>\n<li>the actuator.<\/li>\n<li>a disc motor assembly, containing a DC-motor with a turntable prepared for magnetical clamping<\/li>\n<li>the frame with the sledge drive<\/li>\n<li>the foil with the lasersupply<\/li>\n<\/ul>\n<p>It is suited to be used in a wide variety of applica-tions, going from stand alone players for Midi and Mini systems to general Low End Hifi products.<\/p>\n<p>To cope with this broad application range, the CDM 12.1 needs to be flexible:<\/p>\n<ul>\n<li>suitable for 12 and 8 cm discs according to the CD standard.<\/li>\n<li>limited size.<\/li>\n<li>applicable in horizontal and vertical position.<\/li>\n<li>wide temperature range.<\/li>\n<\/ul>\n<p><strong>Three beam tracking explained <\/strong><\/p>\n<p>The three beams of a CDM 12.1 are generated when the beam of the semiconductor laser (GaAl- As;which transmits invisible infrared light) trans- mits through the 3-beam grating on the top of the<br \/>\nLDGU (LDGU: Laser Diode and Grating Unit). The 3 beams are focused through the objective lens on the disc with central the main spot and on both sides the satellite spots (D1 and D5, also called R1 and R2) positioned 1\/4 pitch off the track. With this configuration it is possible to de- termine the position of the main spot to the track.<br \/>\n(see fig. 1) The by the disc reflected spots are then transmit- ted through the objective lens and via the folding mirror towards the LDGU where the second gra- ting (Foucault grating) is deflecting the spots to<br \/>\nthe detector diodes.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13736\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12.jpeg\" alt=\"\" width=\"1280\" height=\"1879\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-204x300.jpeg 204w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-545x800.jpeg 545w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-768x1127.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-1046x1536.jpeg 1046w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-720x1057.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-520x763.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-320x470.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13715\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23.jpeg\" alt=\"\" width=\"1280\" height=\"1874\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-205x300.jpeg 205w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-546x800.jpeg 546w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-768x1124.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-1049x1536.jpeg 1049w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-720x1054.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-520x761.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-23-320x469.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13716\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24.jpeg\" alt=\"\" width=\"1280\" height=\"1845\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-208x300.jpeg 208w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-555x800.jpeg 555w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-768x1107.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-1066x1536.jpeg 1066w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-720x1038.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-520x750.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-24-320x461.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13717\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25.jpeg\" alt=\"\" width=\"1280\" height=\"1857\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-207x300.jpeg 207w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-551x800.jpeg 551w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-768x1114.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-1059x1536.jpeg 1059w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-720x1045.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-520x754.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-25-320x464.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13718\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26.jpeg\" alt=\"\" width=\"1280\" height=\"1866\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-206x300.jpeg 206w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-549x800.jpeg 549w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-768x1120.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-1054x1536.jpeg 1054w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-720x1050.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-520x758.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-26-320x467.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13719\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27.jpeg\" alt=\"\" width=\"1280\" height=\"1839\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-209x300.jpeg 209w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-557x800.jpeg 557w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-768x1103.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-1069x1536.jpeg 1069w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-720x1034.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-520x747.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-27-320x460.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13721\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29.jpeg\" alt=\"\" width=\"1280\" height=\"1846\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-208x300.jpeg 208w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-555x800.jpeg 555w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-768x1108.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-1065x1536.jpeg 1065w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-720x1038.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-520x750.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-29-320x462.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13722\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30.jpeg\" alt=\"\" width=\"1280\" height=\"1850\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-208x300.jpeg 208w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-554x800.jpeg 554w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-768x1110.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-1063x1536.jpeg 1063w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-720x1041.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-520x752.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-30-320x463.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13723\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31.jpeg\" alt=\"\" width=\"1280\" height=\"1848\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-208x300.jpeg 208w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-554x800.jpeg 554w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-768x1109.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-1064x1536.jpeg 1064w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-720x1040.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-520x751.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-31-320x462.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13724\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32.jpeg\" alt=\"\" width=\"1280\" height=\"1851\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-207x300.jpeg 207w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-553x800.jpeg 553w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-768x1111.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-1062x1536.jpeg 1062w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-720x1041.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-520x752.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-32-320x463.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13725\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33.jpeg\" alt=\"\" width=\"1280\" height=\"1831\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-210x300.jpeg 210w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-559x800.jpeg 559w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-768x1099.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-1074x1536.jpeg 1074w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-720x1030.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-520x744.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-33-320x458.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" 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https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-34-320x459.jpeg 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13727\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35.jpeg\" alt=\"\" width=\"1280\" height=\"1827\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35-210x300.jpeg 210w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35-560x800.jpeg 560w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35-768x1096.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/CMD_12-35-1076x1536.jpeg 1076w, 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(LDGU:Laser Diode and Grating Unit) the actuator. a disc motor assembly,&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":13714,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[254,257,121],"tags":[256],"class_list":["post-13737","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cdm-12","category-circuit-description","category-philips","tag-cdm-12"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CDM 12 - Bram Jacobse<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13737\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CDM 12 - Bram Jacobse\" \/>\n<meta property=\"og:description\" content=\"The CDM 12.1 is a modular CD-mechanism, using a 2-stage, 3-spot system. 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