第一高密度区位于视网膜鼻侧偏腹方，第二高密度区位于颞侧偏背方。
The first high-density area is located slightly ventrally at the rostral side, the second one slightly dorsally at the temporal side.
对 所述多个齿的至少一个和所述背铁在选定部分内进行退火，以便改进 在不同于所述一个方向的第二方向内的磁通量传送。
At least one of the plurality of teeth and the back iron is annealed in selected portions so as to improve magnetic flux transmission in a second direction, different from the one direction.
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