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US 5,471,308 AGranted
Phase shifting device
OwnerRobert Zeieninventor
Life of this patent
Estimating the term…
Abstract
The invention provides a device for shifting the phase of a projected grating by use of a plurality of transparent plates, each disposed at a different angle with respect to the angle of the grate, which plates may be selectively placed between the grating and the projecting lens of a projecting system to modulate, that is, to shift, the phase of the projection of the grating on a test surface.
Claims6
A phase shifting projector comprising:
- a. a light source;
- b. a condensing lens receiving light from the light source;
- c. a transparent slide having a grating thereon;
- d. a projecting lens;
- e. a first flat transparent plate disposed in a plane at a first angle with respect to a plane in which said grating is disposed;
- f. a second flat transparent plate disposed in a plane at a second angle with respect to a plane in which said grating is disposed;
- and
- g. a positioning mechanism for alternately positioning each of said flat plates between the grating and the projecting lens, in a path of projected light which passes from the light source through the condensing lens, grating and projecting lens, in order to shift the phase of an image of the grating projected on a test surface.
5 more elements
A phase shifting projector comprising:
- a. a light source;
- b. a condensing lens receiving light from the light source;
- c. a transparent slide having a grating thereon;
- d. a projecting lens;
- e. a plurality of transparent flat plates, each plate being fixed at a predetermined angle with respect to a plane in which said grating is disposed;
- and
- f. a positioning mechanism for alternately positioning each of the plates between the grating and the projecting lens, in a path of projected light which passes from the light source through the condensing lens, grating and projecting lens, in order to shift the phase of an image of the grating projected on a test surface.
4 more elements
Dependencies are inferred from the claim text.