| 摘要 |
915,020. Optical comparators. HUGHES AIRCRAFT CO. June 13, 1961 [July 1, 1960], No. 21368/61. Class 97 (1). An article and image comparator comprises a combination of a housing arranged above a surface 11 for supporting the article B, a screen 45 carried by the housing, a projector 14 for projecting an image of a transparency on to the screen ; a semi-reflector 30, means, for example lamps 34, for illuminating the article and an opening 23 in the housing so that the article can be viewed through the semi-reflector and the image on the screen can be seen reflected in it; the surface 11, screen 45 and reflector 30 are parallel. In the apparatus shown, the object B is slidably supported on pillars 64 on a base 65, the base being separated from the surface 11 by sponge rubber 66. The reflector 30 is slidably mounted on a frame 28 and the frame is mounted for vertical adjustment on a screw 26. The projector, which comprises any known slide changing means, cooling means and an electromagnetically - operated shutter, projects an image of a transparency through an opening 63 and then via a mirror, not shown, and mirror 46 on to the screen 45. The lamp 34, projector, shutter electromagnet, and slide-changing device may be controlled by foot-operated switches. |
