Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- projekte:dvdlsm:start [2020/01/26 21:59] – [Preface] thasti
+++ projekte:dvdlsm:start [2021/02/06 22:43] – [Lens Actuators] thasti
@@ Zeile 19: / Zeile 19: @@
 ===== OPU Architecture =====
-The OPU in the available drives is a tightly integrated component, mostly consisting of a single cast-aluminum block, in which various optical components are glued.
+The OPU in the available drives is a tightly integrated component, mostly consisting of a single cast-aluminum block, in which various optical components are glued. A top-down-view of the OPU after removing the cover can be seen below.
-A top-down-view of the OPU after removing the cover can be seen here.
+{{:projekte:dvdlsm:opu_disassembled.jpg?500|}}
-** TODO Picture **
 ==== Laser Diodes ====
@@ Zeile 29: / Zeile 27: @@
 ==== Lens Actuators ====
-The primary lens is positioned using electromagnetic actuators. These come in the form of three coils, which tilt or move the coil proportionally to the current flowing though them.
+The primary lens is positioned using electromagnetic actuators. These come in the form of three coils, which tilt or move the coil proportionally to the current flowing though them. Their polarity and required full-scale DC current can be easily found by using a lab power supply.
-** TODO Picture **
-The assignment of pins to actuators could be easily done using a lab power supply.
 ==== PDIC ====
 The PDIC (Photo Diode Integrated Circuit), in a DVD reader application, serves multiple purposes. These include gathering focus, tilt and tracking information from the disk as well as recovery of the RF data stored on the disk tracks. For this reason, PDICs typically consist of at least 6 active diode areas, sometimes even more. The PDIC used in the available drive type is seen below.