Abstract: A lamp collar for use in a lamp assembly of an image projector includes vanes that form an air inlet to allow air to flow into and through the lamp assembly to cool the lamp. The vanes direct the air to flow across the lamp to cool it and to circulate within the lamp assembly before exiting through an exhaust opening. The directed air flow serves to cool the lamp and to maintain a substantially constant lamp temperature.

Abstract: A lamp collar for use in a lamp assembly of an image projector includes vanes that form an air inlet to allow air to flow into and through the lamp assembly to cool the lamp. The vanes direct the air to flow across the lamp to cool it and to circulate within the lamp assembly before exiting through an exhaust opening. The directed air flow serves to cool the lamp and to maintain a substantially constant lamp temperature.

Abstract: A multimedia projector comprises a optical frame that mounts, from back to front, a light source, a back fresnel lens, a back polarizer, an LCD display object, a front polarizer, a front fresnel lens, and a front lens group for projecting images formed by the LCD display object. To provide contrast adjustment, a contrast adjustment mechanism is attached to the back polarizer to permit the manual selective tilting of the back polarizer about an axis extending perpendicular to the front polarizer, in order to optimize contrast of images projected by the front lens group.

Abstract: A multi-purpose display module system for an electrical instrument has a readily detachable display module for remote use that can be quickly reattached. The display module is readily adjusted in tilt angle, whether attached or remoted. A front frame with a recess is mounted on the front of a main chassis for the instrument. Latches are mounted on the main chassis and extend into the recess on opposite sides of the recess, the ends of the latches defining a rotation axis across the recess. A display module has clutch assemblies frictionally, rotatably mounted on opposing sides to fixedly engage the ends of the latches when the display module is mounted within the recess. Release of one latch allows the display module to be removed and set up independently with a stand integral with the clutch assemblies, the display module being electrically connected to the electrical instrument by an electrical cable of suitable length.