Lensless transparency shadowgraph
OwnerDaniel Jacobinventor
Life of this patent
Estimating the term…
Abstract
A low cost and yet versatile shadowgraph is described. The shadowgraph has two components, a transparency holder and a point light source with its mounting and energizing structure. The transparency holder is itself transparent and acts as a backing for a transparency whose shadow is to be formed. The point light source is provided by a flashlight bulb and it is mounted on a slidable collar which is, in turn, mounted on a linear post to enable the position of such light to be adjusted along one axis laterally of the projection surface. Movement of the light source along other axes is naturally done manually so as to minimize the expense associated with manufacturing the shadowgraph.
Claims17
A lensless transparency shadowgraph for projecting onto a projection surface an enlarged shadow of a transparency comprising, in combination,
- A. a point light source;
- B. means for applying electrical energy to said point light source;
- C. means for mounting said light source to shine toward said projection surface;
- and
- D. a transparency holder having a surface area for holding a transparency to be projected, said transparency holder being continuous and transparent across the entire surface of said surface area providing a transparent backing for said transparency to be projected, said transparency holder being free of both direct or indirect connection to said means for mounting and being capable of standing on its own.
A lensless transparency shadowgraph for projecting onto a projection surface an enlarged shadow of a transparency comprising, in combination,
- A. a point light source;
- B. means for applying electrical energy to said point light source;
- C. means for mounting said light source to shine toward said projection surface wherein said mounting means includes both an elongated light post and a light holder for said light source with the position of said light source along the length of said post being adjustable;
- and
- D. a transparency holder having a surface area for holding a transparency to be projected, said transparency holder being continuous and transparent across the entire surface of said surface area providing a transparent backing for said transparency to be projected, said transparency holder being free of both direct or indirect connection to said means for mounting and being capable of standing on its own.
A low cost, lensless transparency shadowgraph for projecting to a projection surface an enlarged shadow of a transparency, comprising, in combination:
- A. a point light source selected to provide a diverging light beam;
- B. means for directing electrical energy to said point light source;
- C. means for mounting said light source to shine toward said projection surface;
- D. a transparency holder for holding a transparency to be projected, which transparency holder extends across the surface area provided for holding a transparency to be projected, and is transparent at said surface area to provide a transparent backing for a transparency to be projected;
- and
- E. a compartment for electrical batteries and wherein said means for directing electrical energy to said light source includes linear contacts extending along a light post.
A low-cost, lensless transparency shadowgraph for projecting to a projection surface, an enlarged shadow of a transparency comprising, in combination:
- A. a flashlight bulb to provide a point light source;
- B. a shade for blocking light emanating from said light bulb;
- C. means for mounting said light bulb to shine toward said projection surface, which mounting means includes a linear light post and a light holder for said bulb slidable along the length of said post to provide adjustment of its position;
- D. linear electrical contacts extending along said light post to furnish electrical energy for energizing said light bulb;
- and
- E. a transparency holder for holding a transparency to be projected, which transparency holder is itself transparent to light emanating from said light bulb and extends across the area provided for holding a transparency to be projected to thereby provide a transparent backing for such transparency.
Dependencies are inferred from the claim text.