福克斯要挑戰開發枕頭形狀的石英晶體FX425B-16.000，縱觀石英晶體的發展歷程已有一百年，經過前人用心研制與發現，石英晶體產品對于我們的生活的方方面面起到不小的作用，隨著深入探究，發現很多關于晶體的小秘密，使得如今的晶體發展極其強大，翻蓋范圍廣泛，而FOX用心研制編碼FX425B-16.000，FQ5032B-14.7456具備良好的穩定性能，適合用于各個領域之中，也包含廣泛智能家居，儀器設備等領域。用AT切割生產的所有石英晶體都是厚度剪切振蕩器，這對于進一步加工是一個很大的優勢。石英晶體是無源元件，沒有外部電壓，它們完全沒有用。精細的電極必須附著在石英上，以激勵石英并使其振蕩。

福克斯要挑戰開發枕頭形狀的石英晶體FX425B-16.000，然而，這些電極的附著被證明是一個巨大的挑戰，這取決于振蕩的類型。理想情況下，電極應該附著在石英上的一個點上，在這個點上，即使在有電壓的情況下，石英晶振的變形也是最小的。使用厚度剪切振子比使用開頭提到的彎曲或縱向振子要容易得多。
然而，石英的進一步加工步驟也是必要的。在一臺特殊的研磨機中，坯料被研磨成墊子的形狀——中間稍厚，向外逐漸變細。石英支架連接到錐形端。以這種方式固定，薄金屬電極最終被蒸發到坯件的較厚的中間部分上。
因此，AT切割在石英生產中具有雙重功能。首先，它確保在-40到85攝氏度的溫度范圍內的高頻率穩定性，其次，它將坯料的形狀定義為厚度剪切振蕩器。

原車標識號	工廠	具體型號	產品	頻段	平率平穩度
FQ3225BR-12.000	FOX晶振	FQ3225B	MHz Crystal	12MHz	±50ppm
FQ1045AR-6.000	FOX晶振	FQ1045A	MHz Crystal	6MHz	±30ppm
FQ1045AR-4.000	FOX晶振	FQ1045A	MHz Crystal	4MHz	±30ppm
FQ1045AR-3.6864	FOX晶振	FQ1045A	MHz Crystal	3.6864MHz	±30ppm
FOXSLF/0368S	FOX晶振	HC49SLF	MHz Crystal	3.6864MHz	±50ppm
FOXLF120	FOX晶振	HC49ULF	MHz Crystal	12MHz	±50ppm
FOXSDLF/128-20	FOX晶振	HC49SDLF	MHz Crystal	12.288MHz	±50ppm
FOXSDLF/081-20	FOX晶振	HC49SDLF	MHz Crystal	8.192MHz	±50ppm
FOXSDLF/098-20	FOX晶振	HC49SDLF	MHz Crystal	9.8304MHz	±50ppm
FOXSDLF/196-20	FOX晶振	HC49SDLF	MHz Crystal	19.6608MHz	±50ppm
FOXSLF/115	FOX晶振	HC49SLF	MHz Crystal	11.0592MHz	±50ppm
FOXSLF/200	FOX晶振	HC49SLF	MHz Crystal	20MHz	±50ppm
FOXSDLF/0368R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	3.6864MHz	±50ppm
FOXSDLF/040R/TR	FOX晶振	HC49SDLF	MHz Crystal	4MHz	±50ppm
FOXSDLF/060R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	6MHz	±50ppm
FOXSDLF/073R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	7.3728MHz	±50ppm
FOXSDLF/100R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	10MHz	±50ppm
FOXSDLF/115R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	11.0592MHz	±50ppm
FOXSDLF/143R-20/TR	FOX晶振	HC49SDLF	MHz Crystal	14.31818MHz	±50ppm
FOXSDLF/240FR-20/TR	FOX晶振	HC49SDLF	MHz Crystal	24MHz	±50ppm
FOXSDLF250F-20	FOX晶振	HC49SDLF	MHz Crystal	25MHz	±50ppm
FX252BS-20.000	FOX晶振	FX252B	MHz Crystal	20MHz	±50ppm
FQ5032BR-10.000	FOX晶振	C5BQ	MHz Crystal	10MHz	±30ppm
FQ5032BR-16.000	FOX晶振	C5BQ	MHz Crystal	16MHz	±50ppm
FX532B-10.000	FOX晶振	FX532B	MHz Crystal	10MHz	±50ppm
FQ7050B-11.0592	FOX晶振	C7BQ	MHz Crystal	11.0592MHz	±30ppm
FX425B-16.000	FOX晶振	FX425B	MHz Crystal	16MHz	±50ppm
FQ5032B-19.6608	FOX晶振	C5BQ	MHz Crystal	19.6608MHz	±30ppm
FQ5032B-14.7456	FOX晶振	C5BQ	MHz Crystal	14.7456MHz	±30ppm
FQ5032B-10.000	FOX晶振	C5BQ	MHz Crystal	10MHz	±30ppm
FQ3225B-20.000	FOX晶振	FQ3225B	MHz Crystal	20MHz	±50ppm
FQ3225BR-16.000	FOX晶振	FQ3225B	MHz Crystal	16MHz	±50ppm
FQ3225BR-20.000	FOX晶振	FQ3225B	MHz Crystal	20MHz	±50ppm
FQ1045A-4.9152	FOX晶振	FQ1045A	MHz Crystal	4.9152MHz	±30ppm
603-12-67		FX325BS	MHz Crystal	12MHz	±50ppm
617-24.572675-1	FOX晶振	FX216B	MHz Crystal	24.572675MHZ	±50ppm
FX532B-11.0592	FOX晶振	FX532B	MHz Crystal	11.0592MHz	±50ppm
FX532B-12.000	FOX晶振	FX532B	MHz Crystal	12MHz	±50ppm
FX532B-16.000	FOX晶振	FX532B	MHz Crystal	16MHz	±50ppm
FX532B-20.000	FOX晶振	FX532B	MHz Crystal	20MHz	±50ppm
FX532B-24.000	FOX晶振	FX532B	MHz Crystal	24MHz	±50ppm
FX532B-24.576	FOX晶振	FX532B	MHz Crystal	24.576MHz	±50ppm
FX425B-20.000	FOX晶振	FX425B	MHz Crystal	20MHz	±50ppm
FX425B-24.000	FOX晶振	FX425B	MHz Crystal	24MHz	±50ppm
FX425B-24.576	FOX晶振	FX425B	MHz Crystal	24.576MHz	±50ppm
217-3.579545-12	FOX晶振	FC	MHz Crystal	3.579545MHz	±50ppm

All quartz crystals produced with the AT cut are thickness shear oscillators – a great advantage for further processing. Quartz crystals are passive components, without external voltage they are completely useless. Fine electrodes must be attached to the quartz to energize it and make it oscillate.
The attachment of these electrodes, however, proves to be a great challenge, depending on the type of oscillation. Ideally, the electrodes should be attached to a point on the quartz where it deforms only minimally, even under voltage. This is much easier with a thickness shear oscillator than with the bending or longitudinal oscillators mentioned at the beginning.
Nevertheless, a further processing step of the quartz is also necessary. In a special lapping machine, the blanks are ground until they assume the shape of a cushion – slightly thicker in the middle and tapering outwards. The quartz holder is attached to the tapered ends. Secured in this way, thin metal electrodes are finally evaporated onto the thicker middle section of the blank.
The AT cut thus fulfils a double function in quartz production. First, it ensures high frequency stability in the temperature range from -40 to 85 degrees Celsius and second, it defines the shape of the blank as a thickness shear oscillator.