| 摘要 |
A low-cost-of-manufacture, portable, capable-of-adjustment range finder for estimating distances between the user and one or more objects with a known width, height or other linear dimension (such as a cup on a putting green, a target for target shooting, a military vehicle, etc.) is disclosed. In each of its embodiments, the invention relates to, and relies on, the fact that the image of an object appears to decrease in size as distance increases. In the preferred embodiment, an opening is formed through which to view the object, and recorded information is expressed on, in or included with the device so that the user can correlate the position of the object image to predetermined distance information. The shape and size of the opening are reasonably variable, but, once the size and shape are determined, the position of the distance information is fixed at the position on the opening where the image size corresponds to the indicated distance. This range finder is also capable of measuring distances from the user to a variety of objects by using the same device, to objects at short distances, to small objects and to objects at ground level.
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