US5068643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burglarproof device
Assignee: SF Co Ltd
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Filing: 1990-03-05
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Granted: 1991-11-26
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Expires: 2010-03-05
Abstract
Abstract A theft prevention device includes an optical sensor for detecting a level of ambient light and a vibration sensor for detecting a vibration of a protected article. The theft prevention device further includes an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article. The theft prevention device may further include a disconnection sensor for detecting a disconnection of a member attached to the protected article, whereby the alarm circuit activates the alarm upon such disconnection. The theft prevention device may further include a microswitch which is automatically activated upon removal of the protected article from an article casing. Still furthermore, the theft prevention device may include devices located at an exit of a place in which the protected article is located for emitting a high frequency light which may be detected by the optical sensor.
Inventors
- 👤 Kazuo Yashina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/22; G08B13/24; G08B13/2402; G08B13/2428; G08B13/2448; G08B13/02; G08B13/14; G08B13/1436; G08B13/1481; G08B13/2431; G08B13/2434; G08B13/2437; G08B13/2442
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
73 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article.
Claim 2
Dependent Claim
73 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article.
Claim 3
Dependent Claim
23 words
A theft prevention device according to claim 1, wherein the alarm circuit includes means for emitting an electromagnetic wave to activate the alarm.
Claim 4
Dependent Claim
20 words
A theft prevention device according to claim 1, wherein said alarm circuit comprises a signal processing circuit and a buzzer.
Claim 5
Dependent Claim
43 words
A theft prevention device according to claim 3, wherein said signal processing circuit comprises a first signal processing circuit responsive to an optical vibratory system which includes the optical and vibration sensors and a second signal processing circuit responsive to the disconnection sensor.
Claim 6
Dependent Claim
41 words
A theft prevention device according to claim 4, wherein the first signal processing circuit comprises an optical signal circuit responsive to the optical sensor, a drive circuit for activating the buzzer and a vibration signal circuit responsive to the vibration sensor.
Claim 7
Dependent Claim
103 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, a disconnection sensor for detecting a disconnection of a member attached to the protected article, and an alarm circuit operatively coupled to the optical sensor, the vibration sensor and the disconnection sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article, or when the disconnection sensor detects a disconnection of the member.
Claim 8
Dependent Claim
103 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, a disconnection sensor for detecting a disconnection of a member attached to the protected article, and an alarm circuit operatively coupled to the optical sensor, the vibration sensor and the disconnection sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article, or when the disconnection sensor detects a disconnection of the member.
Claim 9
Dependent Claim
13 words
A theft prevention device according to claim 6, wherein the alarm is audible.
Claim 10
Dependent Claim
25 words
A theft prevention device according to claim 6, wherein the alarm circuit comprises a signal processing circuit, an alarm wave generating circuit and an antenna.
Claim 11
Dependent Claim
103 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article, the vibration sensor being composed of a body movable in response to vibration of the vibration sensor and a detecting body for detecting a movement of the movable body.
Claim 12
Dependent Claim
103 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects a vibration of the protected article, the vibration sensor being composed of a body movable in response to vibration of the vibration sensor and a detecting body for detecting a movement of the movable body.
Claim 13
Dependent Claim
90 words
A theft prevention device according to claim 9, wherein the movable body is composed of a shaft fixedly mounted to a base, an elongated member pivotally mounted on the shaft at one end thereof, a conductive member mounted at the other end of the elongated member and a coil spring for urging the elongated member to return to a predetermined position, and wherein the detecting body is composed of a conductive stopper having projecting portions positioned along a radius of movement of the conductive member mounted to the elongated member.
Claim 14
Dependent Claim
86 words
A theft prevention device according to claim 9, wherein the movable body is composed of a shaft fixedly mounted to a base, an elongated member pivotally mounted on the shaft at one end thereof, a magnetic body mounted at the other end of the elongated member and a coil spring for urging the elongated member to return to a predetermined position, and a detecting body having a detecting coil which is positioned along a radius of movement of the magnetic body mounted to the elongated member.
Claim 15
Dependent Claim
79 words
A theft prevention device according to claim 9, wherein the movable body is composed of a base, a shaft fixedly mounted to the base, a disk rotatably mounted on the shaft, magnetic bodies provided at a periphery of the disk and a weight provided at the periphery of the disc for gravitationally biasing the disk to thereby return the magnetic bodies to a predetermined position after disturbance, and a detecting body comprising a detecting coil provided on the base.
Claim 16
Dependent Claim
102 words
A theft prevention device according to claim 9, wherein the alarm circuit comprises a signal processing circuit composed of a vibration signal processing circuit for processing a signal provided by the vibration sensor, a noise-removing circuit for filtering a specific frequency from a signal provided by the optical sensor and for outputting a corresponding filtered optical sensor signal, a timer circuit for providing an output signal when the filter optical sensor signal from the noise-removing circuit is continuously present for a predetermined time, and a drive circuit for driving the alarm upon reception of the output signal provided by the timer circuit.
Claim 17
Dependent Claim
160 words
A theft prevention device according to claim 13, wherein the vibration signal processing circuit comprises a power supply switching circuit composed of a first transistor connected to a power supply at an emitter thereof, a first resistor connected to the first transistor at a collector thereof, a first diode connected to the first transistor at a base thereof, and second and third transistors, a second diode connected to a base of the second transistor, a third diode connected to a collector of the second transistor, a capacitor connected to a second resistor, a third resistor connected to a base of the second transistor, a fourth resistor connected to an output of an amplifier and to a base of the third transistor, a fifth resistor having one end connected to a junction point between the fourth resistor and the base of the third transistor and the other end grounded, and a sixth resistor connected to the base of the first transistor.
Claim 18
Dependent Claim
66 words
A theft prevention device according to claim 13, wherein the noise-removing circuit comprises the optical sensor, an amplifier circuit for receiving a detected signal from a junction point between the optical sensor and a first resistor, and a low-pass filter composed of a second resistor, a capacitor, a diode, and an AND circuit for filtering the noise from the detected signal provided by the amplifier circuit.
Claim 19
Dependent Claim
40 words
A theft prevention device according to claim 13, wherein the timer circuit comprises an input amplifying portion composed of input resistors and a transistor and a delay circuit composed of a resistor, a diode, a capacitor, and an AND circuit.
Claim 20
Dependent Claim
75 words
A theft prevention device according to claim 13, wherein the drive circuit comprises a buzzer switch circuit composed of an input resistor connected to an output terminal of said timer circuit and a driving transistor having an emitter which is grounded and a base connected to the input resistor and a collector connected to a diode, and a holding circuit composed of resistors, a transistor and the diode for keeping the buzzer switch turned on.
Claim 21
Dependent Claim
109 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light and for converting the detected light level to a first electric signal, a vibration sensor for detecting a vibration of a protected article and for converting the detected vibration to a second electric signal, and an alarm circuit for receiving the first electric signal provided by the optical sensor and the second electric signal provided by the vibration sensor and for providing an alarm when the first electric signal provided by the optical sensor exceeds a predetermined frequency at a time when a vibration of the protected article is detected by the vibration sensor.
Claim 22
Dependent Claim
109 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light and for converting the detected light level to a first electric signal, a vibration sensor for detecting a vibration of a protected article and for converting the detected vibration to a second electric signal, and an alarm circuit for receiving the first electric signal provided by the optical sensor and the second electric signal provided by the vibration sensor and for providing an alarm when the first electric signal provided by the optical sensor exceeds a predetermined frequency at a time when a vibration of the protected article is detected by the vibration sensor.
Claim 23
Dependent Claim
65 words
A theft prevention device according to claim 18, wherein the alarm circuit provides an alarm after the lapse of a predetermined time in which the first electric signal provided by the optical sensor indicates a change in the level of the ambient light from relative brightness to relative darkness or in which the first electric signal provided by the optical sensor exceeds a predetermined frequency.
Claim 24
Dependent Claim
37 words
A theft prevention device according to claim 18, further including a lighting device provided at an exit of a place in which the protected article is located for emitting light at a frequency exceeding the predetermined frequency.
Claim 25
Dependent Claim
102 words
A theft prevention device comprising an optoelectronic element for generating an optoelectronic voltage responsive to the incidence of light, an optical processing circuit for receiving the optoelectronic voltage generated by the optoelectronic element for charging a cell for supplying power to constituents of the device, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the vibration sensor and the optoelectronic element for providing an alarm when the optoelectronic element detects a change in a level of the light from relative brightness to relative darkness and the vibration sensor detects vibration of the protected article.
Claim 26
Dependent Claim
102 words
A theft prevention device comprising an optoelectronic element for generating an optoelectronic voltage responsive to the incidence of light, an optical processing circuit for receiving the optoelectronic voltage generated by the optoelectronic element for charging a cell for supplying power to constituents of the device, a vibration sensor for detecting vibration of a protected article, and an alarm circuit operatively coupled to the vibration sensor and the optoelectronic element for providing an alarm when the optoelectronic element detects a change in a level of the light from relative brightness to relative darkness and the vibration sensor detects vibration of the protected article.
Claim 27
Dependent Claim
91 words
A theft prevention device according to claim 21, wherein the optical processing circuit is composed of a floating charging portion for supplying the optoelectronic voltage of the optoelectronic element to the cell through an isolation diode and a detecting circuit composed of a transistor and voltage divider resistors, said detecting circuit providing an output signal to the timer circuit when a dividing voltage of the voltage divider resistors is absent to thereby turn on the transistor at a time when the optoelectronic voltage is not applied thereto from the optoelectronic element.
Claim 28
Dependent Claim
130 words
A theft prevention device comprising an optoelectronic element for generating an optoelectronic voltage responsive to the incidence of light, an optical processing circuit for receiving the optoelectronic voltage generated by the optoelectronic element and for providing a first detecting signal, a vibration sensor for detecting vibration of a protected article and for providing a second detection signal indicative of the vibration, and an alarm circuit for receiving the second detections signal provided by the vibration sensor and the first detection signal provided by the optical processing circuit for providing an alarm when the first detection signal provided by the optical processing circuit indicates a change in a level of the light from relative brightness to relative darkness at a time when the vibration sensor detects vibration of the protected article.
Claim 29
Dependent Claim
130 words
A theft prevention device comprising an optoelectronic element for generating an optoelectronic voltage responsive to the incidence of light, an optical processing circuit for receiving the optoelectronic voltage generated by the optoelectronic element and for providing a first detecting signal, a vibration sensor for detecting vibration of a protected article and for providing a second detection signal indicative of the vibration, and an alarm circuit for receiving the second detections signal provided by the vibration sensor and the first detection signal provided by the optical processing circuit for providing an alarm when the first detection signal provided by the optical processing circuit indicates a change in a level of the light from relative brightness to relative darkness at a time when the vibration sensor detects vibration of the protected article.
Claim 30
Dependent Claim
109 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor composed of a molded body and a Hall-effect element and a ball respectively housed therein for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects vibration of the protected article, wherein the ball is made of a magnetic material and is movably disposed adjacent a detecting surface of the Hall-effect element.
Claim 31
Dependent Claim
109 words
A theft prevention device comprising an optical sensor for detecting a level of ambient light, a vibration sensor composed of a molded body and a Hall-effect element and a ball respectively housed therein for detecting vibration of a protected article, and an alarm circuit operatively coupled to the optical sensor and the vibration sensor for providing an alarm when the optical sensor detects a change in the level of the ambient light from relative brightness to relative darkness and the vibration sensor detects vibration of the protected article, wherein the ball is made of a magnetic material and is movably disposed adjacent a detecting surface of the Hall-effect element.
Claim 32
Dependent Claim
47 words
A theft prevention device according to claim 24, wherein the molded body has therein a cylindrical hollow portion in which the ball made of the magnetic material is disposed, the Hall-effect element having a detecting surface which is adjacent an inner periphery of the cylindrical hollow portion.
Claim 33
Dependent Claim
47 words
A theft prevention device according to claim 24, wherein the molded body has therein a hemispherical hollow portion in which the ball made of the magnetic material is disposed, the Hall-effect element having a detecting surface which is adjacent an inner periphery of the hemispherical hollow portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |