Safety device for electronic equipments
First Claim
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1. A safety device for electronic equipment comprising:
- a printed circuit board having mounted thereon at least a portion of said electronic equipment;
electric field detecting means including at least one antenna comprising a set of two linear electric conductor patterns, one end of each of said patterns being arranged in relative proximity to each other, and the other end of each of said patterns extending in substantially opposite directions, said patterns being formed on said printed circuit board, each of said patterns having a length less than 1/8 of the wavelength of an electric signal having a frequency which is the highest of a range of possible frequencies of an alternating-current electric field to be detected and delivering an alternating-current corresponding to the alternating-current electric field applied thereto;
signal level comparison means including at least one rectification means for converting an alternating-current signal to a direct-current signal, detecting a level of the electric signal output from said electric field detecting means, comparing the detected level with at least one reference level, and delivering the compared result; and
abnormality processing setting means for setting the electronic equipment into a predetermined abnormality processing state, when the output of said signal level decision means is found correspondent to detection of the high-level electric field.
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Abstract
A safety device to prevent a vehicle-loaded electronic equipment from malfunctioning due to an influence of the high-level electric field. An antenna pattern for detecting the electric field is formed on the same printed board as the electronic equipment, and an electric signal level of the output from the antenna pattern is determined. When the determined level reaches a level at which the electronic equipment may malfunction, the equipment is forcibly controlled toward a safety range of operation.
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Citations
6 Claims
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1. A safety device for electronic equipment comprising:
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a printed circuit board having mounted thereon at least a portion of said electronic equipment; electric field detecting means including at least one antenna comprising a set of two linear electric conductor patterns, one end of each of said patterns being arranged in relative proximity to each other, and the other end of each of said patterns extending in substantially opposite directions, said patterns being formed on said printed circuit board, each of said patterns having a length less than 1/8 of the wavelength of an electric signal having a frequency which is the highest of a range of possible frequencies of an alternating-current electric field to be detected and delivering an alternating-current corresponding to the alternating-current electric field applied thereto; signal level comparison means including at least one rectification means for converting an alternating-current signal to a direct-current signal, detecting a level of the electric signal output from said electric field detecting means, comparing the detected level with at least one reference level, and delivering the compared result; and abnormality processing setting means for setting the electronic equipment into a predetermined abnormality processing state, when the output of said signal level decision means is found correspondent to detection of the high-level electric field. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification