Illuminating apparatus with a light control channel for photographic enlarging equipment with a rotatable picture stage in the plane of the negative to be copied
AssigneeDurst AG Fabrik Fototechnischer Apparate
InventorWilhelm Pramstraller
Life of this patent
Estimating the term…
Abstract
An illuminating system for use in a photographic enlarging apparatus having first and second light control channels is disclosed. The light control channels receive and transmit light from a light source; the light exit end of the first light control channel has a diagonal that is less than the longest side of the cross-section of the light entrance end of the second light control channel. A picture stage for receiving and supporting a negative to be projected is secured to the light exit end of the second light control channel. The second light control channel and the picture stage are mounted for unitary rotational movement about an axis normal to the plane of the negative.
Claims15
In a photographic enlarging apparatus having a light source and a rotatable picture stage for receiving and supporting a negative to be projected, the improvement comprising:
- means comprising a light control channel positioned on the light entrance side of said picture stage and secured to said stage for rotation therewith about an axis normal to the plane of said negative.
In a photographic enlarging apparatus having a light source and a rotatable picture stage for receiving and supporting a negative to be projected, the improvement comprising:
- a first light control channel for receiving and directing light from said light source;
- a second light control channel mounted to receive light from said first light control channel, the diagonal of the cross-section of the light exit end of said first light control channel being shorter than the longest side length of the cross-section of the light entrance end of the second light control channel;
- the light exit end of said second light control channel being secured to said picture stage for rotation therewith about an axis normal to the plane of said negative.
In a photographic enlarging apparatus having a light source and a rotatable picture stage for receiving and supporting a negative to be projected, the improvement comprising a light control channel positioned on the light entrance side of said picture stage, the light exit end of said light control channel having a cross-section matching the area of said negative to be projected, said light control channel being secured to said picture stage for rotation therewith wherein the light exit end of said light control channel is maintained in alignment with said negative irregardless of the orientation of said picture stage.
Dependencies are inferred from the claim text.