Lamphouse with premixing

Claim 2

In a photographic enlarger having a lamphouse assembly for directing diffused light through a negative onto a photosensitive surface in making a print from the negative, the lamphouse assembly comprising a plurality of individual light sources providing light energy having different primary colors, first means providing a first chamber for premixing said different primary colors, and second means providing a second chamber for receiving the premixed light and additionally mixing the premixed light, said second chamber having an emission opening via which the mixed light energy is directed onto said surface.

Claim 3

A photographic enlarger in accordance with claim 1 in which said second mixing chamber has an upwardly recessed roof at the top and in which said emission opening is located at the bottom.

Claim 4

A photographic enlarger in accordance with claim 1 including light dispersing means between said first and second means.

Claim 5

In a photographic enlarger having a lamphouse assembly for directing diffused light thRough a negative onto a photosensitive surface in making a print from the negative, the lamphouse assembly comprising a main mixing chamber, a premixing chamber at opposite ends of said main mixing chamber, and a plurality of individual light sources associated with each premixing chamber so as to direct light thereinto, each source providing light energy having a particularly primary color and said main mixing chamber having an emission opening via which the mixed light energy is directed onto said surface.

Claim 6

In a photographic enlarger having a lamphouse assembly for directing diffused light thRough a negative onto a photosensitive surface in making a print from the negative, the lamphouse assembly comprising a main mixing chamber, a premixing chamber at opposite ends of said main mixing chamber, and a plurality of individual light sources associated with each premixing chamber so as to direct light thereinto, each source providing light energy having a particularly primary color and said main mixing chamber having an emission opening via which the mixed light energy is directed onto said surface.

Claim 7

A photographic enlarger in accordance with claim 4 in which each premixing chamber includes first and second walls having reflective surfaces, said walls being parallel with respect to each other and to said emission opening.

Claim 8

A photographic enlarger in accordance with claim 5 in which each plurality of light sources includes a set of three lamps arranged at right angles with respect to each other, one lamp directing light directly into the premixing chamber with which it is associated, and each premixing chamber having angularly disposed reflective walls for reflecting light energy from the remaining two light sources into their premixing chamber, said angularly disposed reflective walls being perpendicular to said first and second walls.

Claim 9

A photographic enlarger in accordance with claim 6 including a light dispersive means between each premixing chamber and said main mixing chamber.

Claim 10

A photographic enlarger in accordance with claim 7 in which said light dispersive means constitutes a rod screen composed of cylindrical segments at each side thereof.

Claim 11

In a photographic enlarger having a lamphouse assembly for directing diffused light through a negative onto a photosensitive surface in the making of a print from the negative, the lamphouse assembly comprising a mixing chamber, said mixing chamber including upstanding wall means provided with inwardly facing matte reflective surfaces, said wall means having at least one entrance port through which light energy is introduced into said chamber, and a roof formed with an upwardly recessed portion provided with a generally downwardly facing matte reflective surface, said mixing chamber having an open bottom through which light energy reflected from said surfaces is abstracted and directed onto said surface, and means adjacent said entrance port providing a highly reflective chamber for premixing color light energy to provide the light energy introduced through said entrance port.

Claim 12

In a photographic enlarger having a lamphouse assembly for directing diffused light through a negative onto a photosensitive surface in the making of a print from the negative, the lamphouse assembly comprising a mixing chamber, said mixing chamber including upstanding wall means provided with inwardly facing matte reflective surfaces, said wall means having at least one entrance port through which light energy is introduced into said chamber, and a roof formed with an upwardly recessed portion provided with a generally downwardly facing matte reflective surface, said mixing chamber having an open bottom through which light energy reflected from said surfaces is abstracted and directed onto said surface, and means adjacent said entrance port providing a highly reflective chamber for premixing color light energy to provide the light energy introduced through said entrance port.

Claim 13

A photographic enlarger in accordance with claim 9 in which said recessed portion is inwardly disposed from the outer edges of said roof.

Claim 14

A photographic enlarger in accordance with claim 10 in which said recessed portion is formed with a pair of upwardly inclined panels and a horizontal panel therebetween.

Claim 15

A photographic enlarger assembly in accordance with claim 11 in which said recessed portion is elongated, said inclining panels extending lengthwise along each side of said horizontal panels, and said recessed portion additionally including a pair of upwardly inclining panels at the ends of said horizontal panel.

Claim 16

A photographic enlarger assembly in accordance with claim 12 including a horizontal panel section extending inwardly from said outer edges to the lower edges of said upwardly inclining panels.

Claim 17

A photographic enlarger in accordance with claim 13 in which the marginal edges of said horizontal section overlie the upper edges of said upstanding wall means.

Claim 18

A photographic enlarger in accordance with claim 14 including a plurality of resilient clips engaging said marginal edges to releasably retain said roof in place.

Claim 19

A photographic enlarger in accordance with claim 15 in which said wall means forms an elongated mixing chamber, said one port being disposed in said wall means at one end of said chamber, and said wall means having a second port for introducing additional light energy into said chamber.

Claim 20

A photographic enlarger in accordance with claim 16 includiNg a second premixing chamber, one premixing chamber being associated with each of said ports, both of said premixing chambers being elongated and having reflective surfaces parallel to each other and parallel to said emission opening.

Claim 21

A photographic enlarger in accordance with claim 17 including a rod screen adjacent each of said ports so that light energy introduced into said mixing chamber from said premixing chambers passes through said rod screens.

Claim 22

A lamphouse assembly comprising an elongated mixing chamber, said mixing chamber including upstanding wall means provided with inwardly facing reflective surfaces, said wall means having an entrance port at each end through which light energy is introduced into said chamber, a roof formed with an elongated recessed portion having a pair of upwardly inclined panels and a horizontal panel therebetween, said panels providing a generally downwardly facing reflective surface, said recessed portion being inwardly disposed from the outer edges of said roof, and a horizontal panel section extending inwardly from the outer edges of the roof to the lower edges of said upwardly inclining panels with the marginal edges of said horizontal section overlying the upper edges of said upstanding wall means, means releasably retaining said roof in place, said mixing chamber having an open bottom through which light energy reflected from said surfaces is abstracted, a premixing chamber associated with each of said ports, and a rod screen adjacent each of said ports so that light energy introduced into said mixing chamber from said premixing chambers passes through said rod screens, and first, second and third light source means for each of said premixing chambers, each source means for each premixing chamber providing light energy of a different primary color, said first light source means in each instance being located so as to direct its light energy into its respective premixing chamber in a direction perpendicular to the general plane of the rod screen associated therewith, and said second and third light source means being located so as to first direct light energy in a direction parallel to the general plane of said rod screens, and angularly oriented reflectors in each premixing chamber for reflecting light energy from said second and third light source means in a direction perpendicular to the general plane of the particular rod screen associated therewith.

Claim 23

A lamphouse assembly comprising an elongated mixing chamber, said mixing chamber including upstanding wall means provided with inwardly facing reflective surfaces, said wall means having an entrance port at each end through which light energy is introduced into said chamber, a roof formed with an elongated recessed portion having a pair of upwardly inclined panels and a horizontal panel therebetween, said panels providing a generally downwardly facing reflective surface, said recessed portion being inwardly disposed from the outer edges of said roof, and a horizontal panel section extending inwardly from the outer edges of the roof to the lower edges of said upwardly inclining panels with the marginal edges of said horizontal section overlying the upper edges of said upstanding wall means, means releasably retaining said roof in place, said mixing chamber having an open bottom through which light energy reflected from said surfaces is abstracted, a premixing chamber associated with each of said ports, and a rod screen adjacent each of said ports so that light energy introduced into said mixing chamber from said premixing chambers passes through said rod screens, and first, second and third light source means for each of said premixing chambers, each source means for each premixing chamber providing light energy of a different primary color, said first light source means in each instance being located so as to direct its light energy into its respective premixing chamber in a direction perpendicular to the general plane of the rod screen associated therewith, and said second and third light source means being located so as to first direct light energy in a direction parallel to the general plane of said rod screens, and angularly oriented reflectors in each premixing chamber for reflecting light energy from said second and third light source means in a direction perpendicular to the general plane of the particular rod screen associated therewith.

Claim 24

A lamphouse assembly in accordance with claim 19 in which said roof retaining means includes a plurality of resilient clips engaging the marginal edges of said horizontal section and the upper edges of said upstanding wall means.