3. BLANK AND WAFER
Variation of Orientation Angles &
Oscillation Modes :
| Osc. Mode | Orient. Angle | Freauency |
| Tuning Fork | +2ĄŁX | 770 * (w/l2) |
| Face Shear | DT | 2080 * (1/l) |
| CT | 3080 * (1/l) | |
| FT | 4610 * (1/l) | |
| Thickness Shear | AT | 1670 * (1/t) |
| BT | 2560 * (1/t) |
3.1. AT-Cut Type Wafer:
Specifications of the most common AT-cut wafers are as follows:
Angle Tolerance
| Direction | Illustration | Inclination Angle | Illustration |
| Ø +/- 30" |  |
Ø +/- 15' |  |
| Ø +/- 1' | Ø +/- 20' | ||
| Ø +/- 2' | Ø +/- 30' | ||
| Ø +/- 3' | Ø +/- 40' | ||
| Ø +/- 4' | Ø +/- 45' |
Quartz Material
|
Q-Value |
|
3.2. AT-Cut Primarily Lapped Double Wafer:
| XX' Dimension +-0.2(mm) | ZZ' Dimension +-0.2(mm) | Thickness +-0.01 | Surface Finish | Illustration |
| 8.5 | 20.5 | 0.20-1.20 | W14 GC # 1000 |
 |
| 9.0 | 22.0 | 0.20-1.20 | ||
| 9.0 | 23.5 | 0.20-1.20 | ||
| 9.5 | 22.0 | 0.20-1.20 | ||
| 9.5 | 23.5 | 0.20-1.20 | ||
| 9.5 | 24.5 | 0.20-1.20 | ||
| 10.0 | 22.5 | 0.20-1.20 | ||
| 10.0 | 23.5 | 0.20-1.20 | ||
| 10.0 | 24.5 | 0.20-1.20 |
**Other specifications are also available.
3.3. AT-Cut Primarily Lapped Round Blank:
| Diameter Ø +0/-0.05 (mm) |
Axis Indication h+0.05/-0 (mm) |
Thickness +-0.01 (mm) |
Surface Finish |
Edge Finish |
Illustration |
| 4.85 | 0.2 | 0.15-0.55 | GC # 1000 | GC #600 |  |
| 5.00 | 0.2 | 0.15-0.55 | |||
| 5.85 | 0.2 | 0.15-0.55 | |||
| 5.95 | 0.2 | 0.15-0.55 | |||
| 6.50 | 0.25 | 0.20-0.55 | |||
| 6.55 | 0.25 | 0.20-0.55 | |||
| 6.95 | 0.25 | 0.20-0.80 | |||
| 7.75 | 0.25 | 0.20-0.80 | |||
| 8.00 | 0.25 | 0.20-0.80 | |||
| 8.70 | 0.25 | 0.20-1.10 | |||
| 8.90 | 0.25 | 0.20-1.10 | |||
| 9.50 | 0.25 | 0.20-1.10 |
**Other specifications are also available.
3.4. AT-Cut Square Blank
| Dimension a*b+-0.1 (mm) |
Thickness +-0.01 (mm) |
Surface Finish | Edge Finish | Illustration |
| 8.0 * 8.0 8.5*9.0 8.8*9.7 8.8*12.0 10.0*10.0 12.0*12.0 |
0.2-0.6 | GC # 1000 GC #2000 |
GC # 800 |  |
**Other specifications are also available.
3.5. AT-Cut Strip Blank
| Dimension a * b+-0.01 (mm) |
Frequency Range | Surface Finish | Edge Finish | Illustration |
| 2.0 *8.0 | 3.5 - 15Mhz | Beveled | GC # 2000 |  |
| 2.2 * 8.0 | Etched | |||
| 1.8 * 4.5 | 12 - 35Mhz | Etched |
**Other specifications are also available.
3.6. AT-Cut Round Frequency Blank
| Item | Frequency Range | Surface Finish | Illustration |
| Plane Blank | 8 - 35Mhz | WA/GC#2000 |  |
| WA/GC#3000 | |||
| WA/GC#4000 | |||
| Beveled Blank | 3 -15Mhz | WA/GC#1000 | |
| WA/GC#2000 | |||
| WA/GC#3000 |
**Other specifications are also available.
3.7. Tuning Fork Wafer (X - Cut)
| Orient Angle | Freq. Range | Surface Finish | Illustration |
| +2ĄŁX | 24Khz - 50Khz | Etched |  |
**Other specifications are also available.
| First Page | Properties & Quality of Synthetic Quartz Crystal | ||
| As-Grown Quartz Crystal | Lumbered Quartz Crystal Bar | Blank and Wafer | Crystal Unit |
E-mail: hzctc@mail.hz.zj.cn