초록 ▼

The present invention relates to a portable information terminal apparatus including a stopper mechanism for operating in such a manner that, in a state in which a detachable built-in electronic device such as a memory card is inserted and attached to a connector arranged in the apparatus, when an e

The present invention relates to a portable information terminal apparatus including a stopper mechanism for operating in such a manner that, in a state in which a detachable built-in electronic device such as a memory card is inserted and attached to a connector arranged in the apparatus, when an external impact is applied, the memory card is prevented from being detached from the connector on the rear side of the memory card or, even when the card is detached, the detachment is restricted within a detachment allowable range where electrical connection is not influenced.

대표청구항 ▼

The present invention relates to a portable information terminal apparatus including a stopper mechanism for operating in such a manner that, in a state in which a detachable built-in electronic device such as a memory card is inserted and attached to a connector arranged in the apparatus, when an e

The present invention relates to a portable information terminal apparatus including a stopper mechanism for operating in such a manner that, in a state in which a detachable built-in electronic device such as a memory card is inserted and attached to a connector arranged in the apparatus, when an external impact is applied, the memory card is prevented from being detached from the connector on the rear side of the memory card or, even when the card is detached, the detachment is restricted within a detachment allowable range where electrical connection is not influenced. etween said first line and a reference potential; and an arc detector/processor receiving a voltage across said Zener clamping diode as an input. 11. An arc fault detector according to claim 10, wherein said first means, said second means, said comparison means, and said means for producing a signal further comprise: a rectifier diode in series between said Zener clamping diode and said first line; and a resistance in series between said Zener clamping diode and said first line. 12. An arc fault detector operatively connected to first and second lines of an AC electric power distribution system, comprising: means for sampling a waveform of a line voltage across said first and second lines on a line side of said arc fault detector; and means for determining when said waveform changes from a normal sine wave to an abnormal sine wave characterized by a flat voltage region, thereby indicating an arc fault. 13. An arc fault detector according to claim 12, further comprising means, responsive to said means for determining, for producing a signal determinative of an arc fault. 14. An arc fault detector according to claim 13, further comprising interrupting means, responsive to said signal, for interrupting current in said first and second lines. 15. An arc fault detector according to claim 12, wherein said means for determining includes means for determining both upstream and downstream series arcing. 16. An arc fault detector according to claim 15, wherein said means for determining includes means for determining upstream parallel arcing. 17. An arc fault detector according to claim 12, wherein said means for determining includes means for determining upstream parallel arcing. 18. An arc fault detector according to claim 12, wherein said means for sampling and said means for determining comprise, in combination: a first Zener clamp in series with a limiting impedance between said first line and said second line producing a first clamping voltage; a capacitor and a second Zener clamp in series between said first line and second line producing a second clamping voltage phase shifted from said first clamping voltage; means for storing a delayed value of said second clamping voltage for a specified period of time; means for detecting, during a line voltage zero cross, when said first clamping voltage and said second clamping voltage are both HIGH, no arc fault is present, and when said first and second clamping voltages are both LOW and said delayed value of said second clamping voltage is LOW, an arc fault is present. 19. An arc fault detector according to claim 18, further comprising means, responsive to said means for detecting, for producing a signal determinative of an arc fault. 20. An arc fault detector according to claim 19, further comprising interrupting means, responsive to said signal, for interrupting current in said first and second lines. 21. An arc fault detector operatively connected to first and second lines of an AC electric power distribution system, comprising: means for determining a width of a voltage pulse of a line voltage across said first and second lines in a presence of an arc fault on a line side of said arc fault detector; comparison means for comparing said width to a width constant held in a memory; and means for producing a signal when said width exceeds said width constant. 22. An arc fault detector according to claim 21, wherein said means for producing a signal produces a signal only when said width exceeds said width constant for a predetermined number of line cycles of said line voltage. 23. An arc fault detector according to claim 22, further comprising interrupting means, responsive to said signal, for interrupting current in said first and second lines. 24. An arc fault detector according to claim 21, further comprising interrupting means, responsive to said signal, for interrupting current in said first and second lines. 25. An arc fault detector according to claim