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US 4,099,831 AGranted
High magnification optical apparatus with rotatable reflective lenticulated surface
AssigneeVision Engineering Limited
InventorRobin John Freeman
Life of this patent
Estimating the term…
Abstract
The invention provides an optical device for use in microscopes and screen projectors comprising a screen formed with multiple lenticular surfaces mechanically traversed at a speed above persistence of vision in the light path between an object and an observation plane, the lenticular surfaces increasing the angle of light ray pencil egress from their angle of incidence to an extent rendering the use of eyepieces unnecessary.
Claims5
Apparatus producing an enlarged exit pupil, comprising:
- a. means for positioning at said apparatus an object to be viewed;
- b. objective lens means spaced from said object;
- c. projection lens means spaced from said objective lens means in the optical path proceeding from said objective lens means;
- d. first field lens means positioned in said optical path beyond said projection lens means;
- e. a rotatable disc carrying a reflective lenticulated surface over which discrete lenticules are distributed positioned in said optical path beyond said first field lens means at focal plane of the image so that each lenticule reflects light incident thereon back through said first field lens means;
- f. second field lens means positioned in the continuing optical path reflected from said lenticulated surface;
- g. reflecting means on the side of said second field lens means opposite said lenticulated surface and oriented to reflect the light incident thereon to the eye of an observer, and
- h. means to rotate said discs to provide uniform motion of said lenticulated surface in a direction to cause the depressions of said lenticules to scan across light pencils incident thereon at a speed such that the persistence of vision and form of said depressions of said lenticules effectively multiplies the angle of light egress from said surface of said light pencils whereby effectively to produce said enlarged exit pupil at the eye of said observer.
5 more elements
A microscope system for direct viewing of enlarged images comprising:
- a source of an image to be viewed;
- a rotatable disc carrying a light reflective lenticulated surface thereon;
- optical means positioned to focus said image upon said lenticulated surface, including a planar first minor obliquely positioned in the optical path between said image source and said disc surface, for folding the optical path;
- field lens means positioned between an observer and said lenticulated surface for forming an exit pupil at said observer position, of the image at said lenticulated surface;
- a beam-splitter mirror positioned in the folded optical path beyond said first mirror on the axis between said surface and field lens being perpendicular to the said folded optical path, said beam splitter mirror reflecting the light from said first mirror to said surface and passing the light reflected back from said surface to said field lens means for viewing by said observer;
- and
- means to rotate said disc at rates such that the lenticules scan across said image incident on said lenticules at speeds such that a complete picture is presented, the lenticules being of such form that the viewed pencils of light seen by the observer emerging from said lenticules are apparently enlarged relative to the corresponding incident pencils, due to the persistence of vision at said observer.
4 more elements
Dependencies are inferred from the claim text.