JP2014048213A - Impact detection sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a conventional impact sensor increases a weight of a system due to many lead wires because having such a structure that many lead wires are drawn to a circuit to detect which portion an impact has been applied to.SOLUTION: A sensor in which a contact contacts in the case of application of an impact is used to reduce the number of lead wires as much as possible. The sensor has contacts connected by a resistor or a resistance band and is configured so that a resistance value between signal lines drawn to the outside is observed to detect which portion an impact has been applied to, whereby the number of signal lines drawn to the outside is reduced.

Description

The present invention relates to the structure of an impact detection sensor.

There are various types of impact sensors. For example, Japanese Patent Application Laid-Open No. 2008-107243 is a multi-direction detection type impact sensor, in which a hollow is formed in a circular outer wall, a disk having a predetermined thickness is provided in the inner cavity, and the disk and a circular outer wall are provided. Has a cavity with a predetermined interval (5 mm to 20 mm), and when the projection hits the piezoelectric element, it emits an electric signal, and the electric signal is sent to the electric circuit part by the wire harness, and where the impact occurred Is detected.

JP2008-107243

However, in the patent literature, the direction of the impact can be detected as much as possible, but each sensor that receives the impact (eight in the patent literature) must be sent with a wire harness, and the signal must be sent to the electrical signal processor. However, it is a factor that increases the weight of the system and decreases the reliability due to a large number of wire harnesses.

An object of the present invention is to detect the direction in which an impact is received, but an object is to minimize the wire harness that is taken out from the sensor.

The impact sensor of the present invention is characterized in that the contacts are connected by resistance. In this way, only two electric wires are required to the outside, and the resistance value between the lead wires drawn to the outside is measured with an A / D converter or the like interposed, and the collision site is specified.

Furthermore, there is a method of using a resistor as the resistor, but there is also a method of making the outer or inner conductor or both conductors themselves with a resistance band. In this way, a sensor that is resistant to mechanical shock can be realized.

As described above, according to the present invention, even if the impact is from any direction, the direction of the impact can be detected without using many wire harnesses.

Sensor that can identify impact site 1 Cross section of sensor that can identify impact site Sensor vertical cross-sectional view that can identify impact site Circuit diagram for impact site identification Notification system for impact sites Sensor that can identify impact site 2 Sensor that can identify impact site 3 Circuit diagram example 2 for impact site identification

It is characterized by detecting the location where the impact occurred by arranging multiple contacts at the location where the impact should be detected, connecting the contacts with resistance, and measuring the resistance value. Impact detection sensor.

FIG. 1 shows the first embodiment. Reference numeral 11 denotes a sensor, and reference numerals 12-1 to 12-8 denote protrusions forming contact points. Reference numerals 13-1 to 13-7 denote resistors. 14 and 15 are conductors. The lead lines 16 and 17 are connected to an external circuit, and when there is an impact, the impact site is specified by the resistance value. By covering the entire sensor with rubber or plastic plastic 18 or the like, deterioration of the contacts and the like is prevented.

FIG. 2 is a cross-sectional view of the sensor. Unlike FIG. 1, an example is shown in which two contacts are provided between resistors. In this way, it is possible to further ensure contact of the contacts.

FIG. 3 is a longitudinal sectional view of the sensor of FIG. Provide some space in an insulator, such as rubber, so that it does not become an obstacle to contact the contacts.

FIG. 4 shows an example of a circuit connected to the sensor. Reference numerals 13-1 to 13-n correspond to the symbols in FIG. 1 and represent resistances. The contacts are represented by switch expressions 12-1 to 12-n as equivalent circuits. An A / D converter 45 is connected to the power source 41 and the reference resistor 42, and the digital output 46 can determine which contact is turned on, that is, which part has an impact.

FIG. 5 shows an outline of an example of a system using an impact sensor. By detecting the voltage, it is detected which part has an impact, and the collision direction is detected. The base station is notified of the direction, the order of impact, etc. At the same time, the direction control of the camera is performed to take continuous photographs, and the captured data is stored and transmitted.

FIG. 6 shows a second type of impact position detection sensor. In this proposal, a resistor wire, a nichrome wire that becomes a resistance band, a nichrome band, etc. are used instead of an internal conductor without using a resistor. By doing so, it is possible to secure the strength when an impact is generated with a strong force. FIG. 7 shows a diagram in which the outer conductor is a resistance band. FIG. 6 shows an example in which the internal conductor is a resistance band. As described above, there is a method in which only the inner conductor and only the outer conductor are made of resistance bands, but all of the inner and outer conductors may be made of resistance bands. A circuit example is shown in FIG. Further, in order to maintain a more reliable contact between the resistance band and the contact point, it is also possible to add an additional hand such as hitting a rivet only at the contacted part.
Of course, the shape of the sensor may be circular as shown in the figure, or can be applied as a flat surface.

Any impact detection sensor can be realized. For example, this sensor is installed in a car bumper to detect a collision between a car and a person, detect the moment when the person hits the car, and raise the hood in the appropriate direction. The bumper is usually made of a thin steel plate, so that the person can avoid hitting the engine in the engine room and other hard objects to ensure the safety of the human body outside the vehicle. it can. This reduces damage to the human body, especially the head.

In addition, it is possible to secure the occupant's body safety, such as detecting the place of impact by installing it on the side of the car and activating an appropriate side airbag.

Although the scene is different, it can also be used to detect collision between a lighthouse and a ship. It is also possible to detect from which direction the collision has occurred and take a picture of the camera in the direction of the ship that hit the lighthouse.

11 Sensor that can identify impact site, 1, 12-1 to 12-8 contact point, 13-1 to 13-2 resistance, 14 internal conductor, 15 external conductor, 16 external conductor lead wire, 17 internal conductor lead wire, 18 plastic insulators,
41 power supply, 42 reference resistor, 45 A / D converter, 46 A / D converter output,
61 Sensor that can identify impact site, 2, 62-1 to 62-8 Contact, 63 External resistance band, 64 Internal conductor, 65 External resistance band, 66 Lead wire, 67 Lead wire, 68 Insulator,
71 Sensors that can identify impact sites Part 3, 74 Internal resistance band, 75 External conductor

Although the scene is different, it can also be used to detect the collision between the floating lighthouse and the ship, and it is also possible to detect from which direction the collision has occurred and shoot with the camera facing the direction of the ship that hit the floating lighthouse. .

Claims (1)

It is characterized by detecting where the impact occurred by arranging a plurality of contacts at the site where the impact should be detected, connecting the contacts with resistance, and measuring the resistance value. Impact detection sensor.

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