Claims
- 1. A device for unlocking a lid provided in a vehicle comprising:
- unlockng actuator means for unlocking the lid by using an electric signal;
- means for generating a transmitted pulse signal having a plurality of groups of pulses;
- means for modulating a predetermined frequency signal with said transmitted pulse signal to produce a specific magnetic unlocking signal;
- means for transmitting said specific magnetic unlocking signal;
- magnetic sensor means for receiving said specific magnetic unlocking signal from the transmitting means, said magnetic sensor means including a magnetic core, an exciting coil wound on the magnetic core and a detection coil wound on the magnetic core;
- signal processing means, responsive to said sensor means, for generating a received pulse signal having a plurality of groups of pulses;
- controller means for receiving said received pulse signal from said signal processing means and generating a controller pulse signal when the number of pulses in any said group of pulses is within a predetermined range; and
- counter means for counting pulses in said controller pulse signal and generating said electric signal only when said counter means has counted in sequence a predetermined number of consecutive pulses indicative of an equivalent number of consecutive valid groups of pulses in said received pulse signal.
- 2. A device as defined in claim 1, wherein said magnetic core is ring-shaped and said detection coil is wound across a diameter of said ring-shaped magnetic core.
- 3. A device as defined in claim 2, wherein said signal processing means comprises:
- magnetic sensor exciting means for supplying an exciting signal of a constant frequency to said exciting coil of said magnetic sensor means; and
- detecting circuit means for amplifying, sample-and-holding, and pulse-shaping the output signal of said detection coil to generate said received pulse signal.
- 4. A device as defined in claim 1, wherein said generating means, modulating means and transmitting means are portable.
- 5. A device as defined in claim 1, further comprising means for prohibiting the generation of said electric signal when an ignition switch of said vehicle is closed.
- 6. A device as defined in claim 1, further comprising means for prohibiting the generation of the next electric signal for unlocking the lid during a predetermined length of time after the generation of said electric signal for unlocking the lid for enabling an operator to act near the lid after unlocking the lid without generating another electric signal during said predetermined length of time.
- 7. A device as defined in claim 1, wherein the lid provided in a vehicle is a lid of a trunk.
- 8. A device as defined in claim 7, wherein said transmitting means includes coil means, excited by said specific magnetic unlocking signal, for radiating magnetic power to said magnetic sensor means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
57-71360 |
Apr 1982 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 489,381, filed Apr. 28, 1983, which was abandoned upon the filing hereof.
US Referenced Citations (10)
Non-Patent Literature Citations (1)
Entry |
J. J. Hupert, Remote Control by "Near" Magnetic Field, Electronic Industries, Jul. 1959, pp. 82-85. |
Continuations (1)
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Number |
Date |
Country |
Parent |
489381 |
Apr 1983 |
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