The assignee for this patent application is
Reporters obtained the following quote from the background information supplied by the inventors: "Cinema poster display cases, sometimes referred to as display signs, have been in use for many years, and are typically sized to accommodate a standard-sized movie poster. In the U.S., the standard film poster commonly displayed in theaters is known as a 'one sheet', which is 27 inches wide by 40 inches tall. Other countries have their own standard terminologies and sizes.
"For a theatrical engagement of a particular movie, a poster arrives in the mail, rolled up in a tube from the respective film distributor. The poster is unrolled and placed in the front of a sign, which usually has a clamping mechanism to hold the poster against the front panel of the sign. At the end of the movie engagement, the poster is removed from the sign.
"In a typical cinema sign, the movie poster is illuminated from the back and viewed from the front. These posters usually have a left-right inverted image of the front side printed on the back side, so that when viewed in back-lit illumination, the poster forms a single image with generally high contrast. Such posters may be referred to as 'double sided'.
"Initially, these movie signs used incandescent lamps as their light sources. In recent years, the incandescent lamps have been replaced by fluorescent lamps. The standard 'one sheet'-sized cinema sign has fluorescent tubes extending vertically along the left and right edges of the poster area of the sign. When displayed in the sign, the poster is disposed at the front panel of the sign, and is typically about five inches in front of the back surface of the sign.
"In recent years, light-emitting-diodes (LEDs) have emerged as a new technology for illumination and lighting applications. LEDs have potential advantages over fluorescent lamps in that they may be more efficient, may produce less heat, may having longer lifetimes, and may function more efficiently at cold temperatures. For these reasons and others, there has been a recent effort to incorporate LEDs into cinema signs. For example, a known LED-based display device is discussed in U.S. Pat. No. 7,841,733 (Meulenbelt)."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "An embodiment is a replacement light module. The replacement light module includes a heat sink elongated along a first direction, which can coincide with a vertical direction when the light module is installed in a cinema poster display case. The replacement light module further includes a plurality of LEDs supported by the heat sink. The LEDs are spaced apart in the first direction. Each LED emits light into an angular distribution centered around a respective surface normal. The replacement light module further includes a cylindrical lens elongated along the first direction. The lens receives a central portion of the light emitted from the LEDs and transmits the central portion therethrough. The lens alters the angular path of the transmitted light along a second direction but not along the first direction, the second direction coinciding with a forward direction when the light module is installed in a cinema poster display case. The lens has at least one asymmetric portion that produces an angular asymmetry of the transmitted light in the second direction but not in the first direction. The replacement light module further includes a pair of elongated, inclined surfaces on the heat sink. Each inclined surface is elongated along the first direction and is parallel to the first direction. Each inclined surface extends from a position proximate a lateral edge of the LEDs to a position proximate a lateral edge of the lens. The pair of inclined surfaces open away from the LEDs toward the lens. Each inclined surface receives a peripheral portion of the light emitted by the LEDs and diffusely reflects the peripheral portion toward the lens.
BRIEF DESCRIPTION OF THE DRAWINGS
"The foregoing and other objects, features and advantages disclosed herein will be apparent from the following description of particular embodiments disclosed herein, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles disclosed herein.
"FIG. 1 is a perspective drawing of a movie poster display case.
"FIG. 2 is a top-view schematic drawing of the display case of FIG. 1, with the fluorescent lamps still present.
"FIG. 3 is a top-view schematic drawing of the display case of FIG. 1, with the fluorescent lamps removed and replaced by a single LED lamp.
"FIG. 4 is a top-view schematic drawing of some angular variables that describe the geometry of the LED lamp in the display case.
"FIG. 5 is a front-view schematic drawing of the display area of the display case.
"FIG. 6 is a perspective drawing of an example set of pins that extend from the lamp.
"FIG. 7 is a top-view drawing of the optical components of an example LED lamp.
"FIG. 8 is a perspective drawing of the optical elements of FIG. 7.
"FIG. 9 is a plot of calculated intensity as a function of propagation angle for the example configuration of FIGS. 7 and 8.
"FIG. 10 is a top-view drawing of the optical components of another example LED lamp.
"FIG. 11 is a plot of calculated intensity as a function of propagation angle for the example configuration of FIG. 10.
"FIG. 12 is a top-view drawing of the optical components of another example LED lamp.
"FIG. 13 is a plot of calculated intensity as a function of propagation angle for the example configuration of FIG. 12."
For more information, see this patent application: Tessnow, Thomas; Albright, Kim; Boyd, JR., Ronald E. LED Lamp with Asymmetric Cylindrical Lens for Poster Display Case. Filed
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