Cropping guide
OwnerAnthony Picciottoinventor
Life of this patent
Estimating the term…
Abstract
A cropping guide especially for drawing a proportioned field for use in audio/visual work has three straight edge marking device guides, each with an index associated therewith. The first and second straight edges define a right angle therebetween and the third edge defines a bisector of the right angle to form an angle with the first edge having a cotangent equal to the ratio of the field to be drawn using the cropping guide. The ratio of the index on the first edge to the corresponding index on the second edge is also the same as the field ratio. The index on the third edge is defined by the projection thereon along a line parallel to the first edge, of the index on the second edge.
Claims7
A cropping guide for drawing a field having a predetermined ratio of width to length, comprising:
- a flat element having;
- first, second and third straight edges having first, second and third calibrations, respectively, said element being in the form of a template wherein said first and said third straight edges form a side and a hypotenuse of a triangle which is cut out of said template, said second straight edge being one side of a rectangular slot cut from said template,
- said first edge determining the width of the field,
- said second edge defining a right angle with said first edge and determining the length of the field,
- said third edge bisecting said right angle to define a second angle with said first edge, the cotangent of said second angle being equal to said predetermined ratio,
- said first and second calibrations being in said predetermined ratio with respect to each other,
- said third calibrations being defined by the intersection of the projection of said second calibrations on said third straight edge along a projection parallel to said first straight edge.
Dependencies are inferred from the claim text.