SECTION 1
Title 1
Title 2
Title 3
SECTION 2
Title 1
Title 2
Title 3
Title 4
SECTION 3
Title 1
Title 2
Title 3
Title 4
Title 5
SECTION 4
Title 1
Title 2
Title 3
Title 4
Title 5
Title 6
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Controller
for photographic enlarger or the like
A controller for providing accurate
analysis of color and density of the light from any color
enlarger or the like. The controller is an on-easel analyzer
having built-in automatic timer controls for controlling
exposures from point 1 seconds to 99.9 seconds. Density and
color filtration data provided by video or other off-easel
analyzers are manually entered into digital switches on a
control panel of the controller or such data can be
automatically programmed in the controller through the use of
punched paper tape or the like. The controller includes null
indicator means to indicate a balance when the enlarger f/stop
and color balance are adjusted. The controller may be programmed
in units as small as 1 cc in color filtration ranges from 0 to
99 cc and density ranged from 0 to 199 cc. Controller also has a
photo-sensitive probe, slope controls, a digital emulsion memory
system and the controller can operate with substantially any
color enlarger
4,231,654
Prickett November 4, 1980
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Light
mixing system for a photographic enlarger
A light mixing system for use in a
photographic enlarger in which light from a light source is
admitted to a light mixing module through an aperture (and/or
through a light modifying filter system for color correction for
color enlargements) to mix light beams to provide substantially
uniform energy distribution at the outlet port of the light
mixing module. The light mixing module includes a lens having a
conical surface to receive the admitted light beams and to
direct the light beams along angular paths with respect to the
axis of the conical surface. The lens interfaces with a diffuser
means comprising a multitude of fiber optic elements each
adapted to receive light beams along the angular path, to
transmit and reflect the light beams and to cause the light
beams to depart the exit end of the fiber optic element in the
form of a fan or cone of substantially the same angle as that of
the light beams at the lens for mixing said beams. A light guide
means further mixes the exiting mixed light beams from the fiber
optic diffuser and exits such beams into a frustoconical chamber
having light reflecting and diffusing surfaces to provide an
evenly distributed diffuse secondary light source of expanded
areas
4,240,738
Praamsma December 23, 1980
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Apparatus
for the determination of the color composition of the printing
light in a photographic enlarger
An apparatus for determining the
color composition of the printing light of a photographic
enlarger samples and measures the light within the intermediate
diaphragm chamber of the objective lens. The light is sampled by
inserting color-sensitized photoelectric transducers within the
intermediate diaphragm chamber or inserting a light conducting
means within the chamber between exposures for sampling and
conducting the light outside of the chamber to external
photoelectric transducer means, which determines the color
content in any operative manner. The light conductor may be
mounted on a slide together with an adjustable diaphragm for
alternating inserting in the path of the printing light or the
light conductor and a number of apertures of different
cross-sections may be mounted on a rotary disk for optional
insertion along the optical axis. The light conducting means
includes a diffusing element within a light conducting and
reflecting chamber. A removable diffusing element is also
mounted in line with the adjustable diaphragm on the slide.
4,188,125
Barbieri , et al. February 12, 1980
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Photographic
color enlarger
MINOLTA
One or more color-compensating filter-adjusting
dials in the head portion of a color enlarger have on their
peripheral surfaces indicia denoting values which are a function
of the extent a corresponding color-compensating filter
intercepts an optical path, and have in their end surfaces cams
for directly or indirectly operating respective
color-compensating filters. The dials are disposed in the head
portion above a reflector in a mixing chamber in the head
portion in a manner to be freely externally accessible and
manually operable and with the indicia on the dials being
visible externally of the head portion.
4,168,904
Furukawa September 25, 1979
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Apparatus
for sampling printing light in a photographic enlarger for
determining its color composition
The color composition of printing
light in a photographic enlarger is sampled by rotating a
sampling duct between the original image holder and the
objective lens. The duct has a thin elongated rectangular shape
with a light diffusing aperture disposable in the printing light
and with mirrored inside walls, which transmit a representative
sample of the printing light to the outlet aperture, which is
disposed in front of light measuring receivers. The receivers
generate a signal which is processed to govern the insertion of
filters in the light-mixing head of the enlarger to provide the
desired color composition in the printing light. A convenient
push control and actuating switch arrangement is provided to
simplify insertion of the duct in the printing light before and
its removal during the printing exposure.
4,165,175
Barbieri August 21, 1979
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Photographic
enlarger
The invention relates to a photographic enlarger
having an exchangeable film trap disposed in a projection head
for receiving film, a magnifying lens disposed on one side of
the film trap, and an insert member including a light deflection
mirror and a condenser abutting the film trap; the insert member
is disposed on the other side of the film trap.
4,136,948
Prochnow January 30, 1979
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