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若要把霍尔效应的放音头制成盒式录音机的组合磁头,就必须考虑后缝隙的设计,而在一般的磁头制造工艺中,后缝隙是为了解决前缝隙的制造困难而设计的。后缝隙磁头馈给霍尔元件的带磁通比前缝隙型磁芯要少。实现磁芯和霍尔元件的最佳设计要求如下:首先,信噪比最大时的最佳缝隙长度为2.0μm,之所以如此是考虑到缝隙较短磁通较大,而缝隙较长可产生较小的霍尔元件噪声。其次,考虑到较大的截面积能流过较大的磁通,而较小的截面积能产生较大的磁场,因此,后缝隙处的最优磁芯横截面积设计为0.15mm×0.20mm,霍尔元件的宽度等于0.20μm。这样设计的磁芯与改进后的霍尔元件配合,可得到一种放音信噪比为57dB(比一般磁头高2dB)的新型组合磁头。
In order to make a Hall-effect playback head into a video cassette recorder combo head, the design of the rear gap must be taken into consideration. In the conventional magnetic head manufacturing process, the rear slot is designed to solve the manufacturing difficulty of the front slot. Back gap heads feed Hall elements with less flux than front slot cores. The best design requirements for implementing the core and the Hall element are as follows: First, the optimum slot length at maximum signal to noise ratio is 2.0 μm, so taking into account that the shorter the slot the larger the flux and the longer the slot can produce Smaller Hall element noise. Secondly, taking into account the large cross-sectional area through a larger flux, and a smaller cross-sectional area to produce a larger magnetic field, so the optimal rear core cross-sectional area of the design is 0.15mm × 0.20 mm, the width of the Hall element is equal to 0.20 μm. This design of the core with the improved Hall element, you can get a playback signal to noise ratio of 57dB (2dB higher than the average head) of the new combination of magnetic head.