OPTICAL PROJECTION DEVICE GOLF

Brand	Owner	Address	Description
LASERPRACTICE PRO	BUSHNELL CORPORATION	9200 Cody Overland Park KS 66214	optical projection device for golf instruction;LASER PRACTICE PRO;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A projection optical unit has two lens groups. A first projection optical unit disposed closest to an image display element, temporarily forms a first enlarged image (magnification: M1) at the image display element side, rather than at a second projection optical unit. The first enlarged image is subsequently projected in an enlarged form (magnification: M2, wherein M2>M1) onto a screen via the second projection optical unit. A field lens group having positive refractive power is disposed between the first projection optical unit and the second projection optical unit. Consequently, the relationship between F2, which is the F-value of the second projection optical unit, and F1, which is the F-value of the first projection optical unit, becomes F2=F1/M1, whereby it is possible to realize very-wide-angle imaging at a field angle exceeding 90 degrees.