Browse Prior Art Database

SILENT ALERT BELT CLIP FEATURE

IP.com Disclosure Number: IPCOM000006348D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-27
Document File: 1 page(s) / 52K

Publishing Venue

Motorola

Related People

Yung Chuang: AUTHOR [+2]

Abstract

The growing popularity of silent alerting in pagers has increased the demand for motors capable of resid- ing in a pager. With the advent of display pagers, our customers are constantly looking for more features in a much smaller pager. Conventional motors consume up to 4 percent in volume and 10 percent in square surface of the total radio space. Current technology and manu- facturing processes on cylindrical and tlat pancake motors will not allow significant reduction in size without sacri- ficing the excitation level. The concept of relocating the motor or excitation device from inside the radio to the belt clip allows the use of a lower energy exciter for tactile alert and frees up premium product space for other electronic components. When the excjtation device is mounted in the belt clip, it is placed closer to the human body and therefore a smaller, lower energy device can be used to provide what is perceived as the same level of excitation.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

SILENT ALERT BELT CLIP FEATURE

by Yung Chuang and Jerry Oliver

  The growing popularity of silent alerting in pagers has increased the demand for motors capable of resid- ing in a pager. With the advent of display pagers, our customers are constantly looking for more features in a much smaller pager. Conventional motors consume up to 4 percent in volume and 10 percent in square surface of the total radio space. Current technology and manu- facturing processes on cylindrical and tlat pancake motors will not allow significant reduction in size without sacri- ficing the excitation level. The concept of relocating the motor or excitation device from inside the radio to the belt clip allows the use of a lower energy exciter for tactile alert and frees up premium product space for

other electronic components. When the excjtation device is mounted in the belt clip, it is placed closer to the human body and therefore a smaller, lower energy device can be used to provide what is perceived as the same level of excitation.

  There are several interconnect systems that can be used to connect the excitation device to the pager. One approach is using a flex circuit that is inserted through an opening in the plastic housing. The flex is soldered to the vibrator device and contact to the printed circuit board is made using a spring as shown in the side view below.

-Excitation Device

0 Motorola. ,nc, 19% 137

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