Nec Corporation

Tetsumi Ishiguro

Kazuhiro Kudoh

Kazumori Yamada

Akira Muramatsu

A radio pager capable of changing the reception frequency thereof, as desired, and having a replaceable crystal oscillator. A reception frequency selecting device selects one of call signals having a plurality of predetermined frequencies which matches the crystal oscillator. A casing is formed with a first opening for allowing the crystal oscillator to be selectively attached to or detached from a printed circuit board, and a second opening for allowing the oscillator to be selectively inserted into or pulled out of the casing.

Radio pager housing having openings for replacing a crystal oscillator

In a radio communication apparatus for use in carrying out a receiving operation of selectively receiving a call signal specific to the apparatus, a counter is counted up one by one to produce a count each time when the call signal is received. The count is successively compared with a plurality of threshold values by a control section to determine a controllable perceptual notifying mode which may be at least one of an audible and a visual notifying modes. In the audible notifying mode, the control section varies a volume of an audible tone through a tone generator in dependency upon the count. In the visual notifying mode, display elements, such as light emitting diodes, provide visual displays which are different from one another and which are determined by the count. Such variations of the audible tone and/or the visual displays are helpful for notifying a possessor of reception of the call signal.

Radio communication apparatus capable of notifying reception of a call

Disclosed is a structure of a housing for a paging receiver of the type including a storage device and a write terminal for a writing code in the storage device. A battery case is disposed in a part of the housing and provided with a window that communicates with the interior of the housing. The write terminal electrically connected to the storage device faces the window so that a connector of a writing apparatus may be inserted into the housing through the window to be connected to the write terminal. The write terminal is not exposed to the outside of the housing, thereby to enhance the resistivity to static electricity and hermetic sealing against dust, water and other impurities and therefore to achieve reliable operation.

Growing community of inventors

Tokyo, Japan

Tetsumi Ishiguro