| 摘要 |
<p>A component mount machine for mounting electronic circuit elements (101) has movable mirrors (809, 810) for recording the accurate position of a component (101) and the coplanarity of leads (101') thereof. The mirrors are always located symmetrically in the same angle to the bottom surface of the component (101) and are moved horizontally to positions underneath the component for reflecting pictures of the component to cameras (801, 802). The two mirrors produce in first, proximate positions (114) a composite picture of the bottom of the component (101). In second, distant positions a picture is obtained, for a suitable vertical position of the component, of rows of connecting leads (101') of the component, the image plane then forming a small angle to the bottom surface of the component. In the second position a background illumination is obtained from light sources (805, 806) suitably arranged beneath the cameras (801, 802) and the light rays are then deflected by additional mirrors (803, 804) located near the cameras. Cameras having a stripshaped recording field with only a single or a few pixel elements in a horizontal movement direction of the component can be used in an alternative embodiment for taking pictures 'in the fly', producing a series of pictures to be analysed for position data.</p> |
