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梯形棱镜是光学观察仪器中常用的棱镜,这种棱镜的两个直角面小、斜面狭长、尖塔差要求高,一般在40″以内,如图1所示。这种棱镜的加工方法,以往一般是这样的:在磨砂面上加一块90°副板(图2),装石膏盘精磨抛光一直角面,下盘后加90°副板改90°角,再上石膏盘精磨抛光另一直角面,最后修改斜面,保证δ45°和尖塔差。为保证石膏盘精磨抛光后零件的尖塔差仍在40″以内,上盘前修角时应改到最好的程度。但由于斜面狭长不易改平,所以成品
Trapezoidal prism optical observation instrument commonly used in the prism, the prism of the two right-angled small, narrow incline, minaret difference is high, generally less than 40 “, as shown in Figure 1. This prism processing methods, as in the past general This is the case: Add a 90 ° sub-plate (Figure 2) on the matte side, install the gypsum plate in a smooth, polished, right-angled position, add 90 ° to the bottom plate, and change the 90 ° angle to the gypsum plate. A regular angle, and finally modify the bevel to ensure that the difference between δ45 ° and spire.To ensure gypsum plate after grinding polishing spire still sparse parts within 40 ”, the angle before the plate should be changed to the best angle. However, because the incline is not easy to change flat, so finished