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普通放大相纸代替波拉(Polaroid)片拍摄B超图象已有报道。我们对Aloka SSD-256型B型超声机附设ACR-CA 757u波拉相机曝光控制部分及波拉片暗盒进行了改进,使用至今,效果良好,现介绍于下。 一、曝光时间控制部分的改进。我们自行设计加装了快门电子自动调节延时装置(图1),在保留波拉相机原有功能的情况下,增加了普通放大相纸摄象功能。图中Rr为光敏电阻,它能根据波拉相机前电视屏图象的亮度变化改变阻值,自动调节曝光时间,大大提高了曝光精度,保障了照片的质量。
General magnifying paper instead of Polaroid (Polaroid) film B-image has been reported. We have improved the Aloka SSD-256 B-type ultrasound machine with the ACR-CA 757u Pola camera exposure control section and the Polaroid cassette, and are working well so far. First, the exposure time control part of the improvement. We designed and installed a shutter electronic automatic adjustment delay device (Figure 1), while preserving the original features of Pola cameras, an increase of ordinary zoom photo paper camera function. Rr for the photo-resistor in the picture, it can change the resistance according to the change of the brightness of the image of the TV screen before the Pola camera, adjust the exposure time automatically, greatly improve the exposure accuracy and guarantee the photo quality.