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COMBINATION LAMP REFLECTOR WITH TRANSDUCER HOUSING OR CIRCUIT BOARD SHOCK PAD

IP.com Disclosure Number: IPCOM000006144D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-07
Document File: 2 page(s) / 80K

Publishing Venue

Motorola

Related People

C. Anderson: AUTHOR

Abstract

Light pipes and diffusers used for backlighting liquid crystal displays typically collect less than half the light radiated from circuit board-mounted lamps. Although an additional component could be added to serve as a reflector, the advantage of increased light generally does not offset the space and cost reqnire- ments. Thus, the combination of a lamp reflector with an existing part is desired.

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MOTOROLA INC. Technical Developments Volume 12 April 1991

COMBINATION LAMP REFLECTOR WITH TRANSDUCER HOUSING OR CIRCUIT BOARD SHOCK PAD

by C. Anderson

  Light pipes and diffusers used for backlighting liquid crystal displays typically collect less than half the light radiated from circuit board-mounted lamps. Although an additional component could be added to serve as a reflector, the advantage of increased light generally does not offset the space and cost reqnire- ments. Thus, the combination of a lamp reflector with an existing part is desired.

  The modification of the resonator housing of a transducer to encircle the unused portion of a lamp with a highly reflective surface, shown in Figure 1, improves light output considerably. Similarly, a shock pad used, for example, to cushion the components between two parallel circuit boards may be designed to encircle part of a lamp, shown in Figure 2. The resonator housing may be molded from a highly reflective plastic, white being one choice for color. Likewise, butyl shock pads may be manufactured in white. Alternatively, a reflective material may be applied, such as reflective tape or vacuum-deposited

metal. The modificatiorj of the color of the reflector would change the coloi of the backlighting, which might be desirable from a marketing perspective.

  A working model was built that employed a diffuse white reflective surface. This had the effect of increased illuminatiop as well as softening the shadows of the fi...