RADIO WAVE TRANSMITTING DEVICE FOR ROBBERY PREVENTION SYSTEM

PROBLEM TO BE SOLVED: To provide a radio wave transmitting device for robbery prevention system for attaining remarkable cost-down. SOLUTION: Concerning a radio wave transmitting device 1, a change in an inductance value L of a transmitting antenna 5 is suppressed by a metal object 3, which is arran...

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Bibliographische Detailangaben
1. Verfasser:	TSUCHIKIRI YOSHIKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS ANTENNAS, i.e. RADIO AERIALS BASIC ELECTRIC ELEMENTS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS TRANSMISSION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a radio wave transmitting device for robbery prevention system for attaining remarkable cost-down. SOLUTION: Concerning a radio wave transmitting device 1, a change in an inductance value L of a transmitting antenna 5 is suppressed by a metal object 3, which is arranged inside a easing 2 or in one part of the easing 2 and faces the transmitting antenna 5 almost orthogonally to the axial line of the transmitting antenna 5 while having a size almost equal to or larger than the outer winding diameter of the transmitting antenna 5 even when the other metallic object further exists around the easing 2 and even without an automatic tuning circuit to use many expensive parts, the transmission output of a prescribed radio wave signal can be stabilized at high level.