JPS59134283A - Key discriminating apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a key discrimination device. The health identification device according to the present invention can be used as a crime prevention device, for example, by checking the bones in the driver's possession, and emitting an alarm if the driver opens the car door with a means other than the key in his possession. It is also used for applications such as identifying the keys held by multiple drivers and automatically adjusting the seat position to suit each driver.

Generally, as means for identifying a key, there is a method that uses a microswitch or the like to open and close a door, but there are problems such as a complicated structure.

The object of the present invention is based on the idea that the key is made of a magnetic material, and by magnetizing the key, the direction of magnetization of the key is detected by, for example, a ball element fixed in a housing into which the key is inserted. The objective is to accurately determine the size of Shu using a practically convenient technique.

In the present invention, a key cylinder fixing part made of a non-magnetic material is fixed to an automobile door, and when a iron capable of generating a magnetic field unlike the non-magnetic material is inserted, the key cylinder fixing part can rotate within the key cylinder fixing part. It is composed of a key cylinder rotating part that can open the lock, a magnetic resistance element attached to the key cylinder fixing part, and a detection electric circuit that receives a signal from the magnetic resistance element, There is provided a key discrimination device characterized in that the key is discriminated by detecting a change in the resistance value of the magnetoresistive element due to the magnetic field generated by the plow when the plow is inserted into a cylinder rotating part.

Even if the key is made of non-magnetic material, detection can be performed using the same detection method by embedding a magnet in a part of the key.

A key used in a key discrimination device as an embodiment of the present invention is shown in FIG. In FIG. 1, a first key 71 is made of a magnetic material, and its ends 711 and 712 are magnetized to N and S poles, respectively.

FIG. 2 is a cross-sectional view of a key cylinder section in a key discrimination device as an embodiment of the present invention. 7 in Figure 2
1 is the first key, 22 is a key cylinder fixing part fixed to the dragon door (not shown), and 21 is a key cylinder fixing part 22 that rotates when the first key is inserted. It is a key cylinder rotating part that can be opened and opened.

23 is a sensor housing fixed to the key cylinder fixing part; 5 is fixed to the sensor housing 23;
And when the key 71 is inserted, the link 53, the leaf spring 51,
and a switch that is turned on by a contact 52. 33
is a magnetoresistive element, which is connected to a detection electric circuit 4 in the form of a printed board.

FIG. 3 shows an outline of the overall configuration of a key discrimination device as an embodiment of the present invention. In FIG. 3, 4 is a detection electric circuit, 46 is a power supply terminal to which a constant voltage vD is applied, 47 is an output terminal, and 48 is a ground terminal. Reference numeral 33 denotes a magnetic resistance element composed of resistors 331 and 332. A constant voltage VD/2 appears at the terminal 333 in the absence of a magnetic field.

413 and 414 are resistors, and a constant voltage VD/2 appears at a terminal 415. 41 is an operational amplifier (hereinafter op
amplifier), 421.422.

43 is a resistor, and 44 is a transistor. The key 71 shown in Fig. 2 is the key cylinder rotating part 2.
1, it turns on and power is supplied from the power supply terminal 46 to the detection electric circuit 4.

The operation will be explained using the above configuration. In Figure 2,
If @71 is not inserted, the power is turned off and no signal appears at the output terminal 4-7.

Next, when fi$71 is inserted and the N pole side of the key approaches the magnetoresistive element 33, in FIG. The potential is Δ■ higher than the value VD/2. Then, the output of OP Ang 41 becomes "0",
When the transistor 44 is off, the key 71 is connected to the output terminal 47.
A signal vD appears indicating that the

In implementing the present invention, various modifications can be made in addition to the above-described embodiments. For example, in the above-mentioned embodiment, the detection method was shown when the tip 711 of @71 shown in FIG. In the figure, the resistance 331 of the magnetoresistive element 33 has a larger p value than the resistance 332. A signal of "1" appears at the output terminal of the OP amplifier 41, the transistor 44 is turned on, and the signal "1" appears at the output terminal 47. A signal rOJ appears indicating that the key has been inserted. By changing the magnetization direction of the keys in this way, it is possible to distinguish between a plurality of keys.

Further, in the above-mentioned embodiments, the key is made of a magnetic material, but if the key is made of a non-magnetic material, as shown in FIG. It is clear that similar detection is possible by appropriately selecting the N and S poles of the magnet 722 shown in FIG. 4(B) and embedding it.

In addition, in the above embodiment, a switch was provided to detect the insertion of the key, and when the key was inserted, power was applied to the detection electrocircuit path 4. However, when detecting a single drop, This switch is not required. In this case, when "71 shown in FIG. 1 is inserted, the above-mentioned continuous power supply voltage VD is output to the output terminal 47, but when the second key is inserted and when the key is not inserted, has output terminal 4
At 7, the ground potential appears.

According to the present invention, keys can be accurately identified using a practically convenient technique, and the present invention is useful for crime prevention of automobiles, automatic adjustment of the driver's seat position, and the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a key used in a key discrimination device as an embodiment of the present invention, FIG. 2 is a sectional view showing the structure of a cylinder part of the health discrimination device as an embodiment of the present invention, FIG. 3 is a diagram schematically showing the overall configuration of a scale discriminating device as an embodiment of the present invention, and FIGS. 4 (4) and (B) are diagrams illustrating another embodiment of the present invention. (Explanation of symbols) 21...Key cylinder rotating part, 22...Key cylinder fixing part, 23...Sensano-tsu song, 33...
・Magnetoresistive element, 331.332...Resistance, 333・
...Terminal, 4...Electric circuit for detection, 41...Operation amplifier, 413°414...Resistor, 415...Terminal,
421,422゜43...Resistor, 44...Transistor, 46...Power supply terminal, 47...Output terminal, 48
... Earth terminal, 5 ... Switch, 51 ... Leaf spring, 52 ... Contact, 53 ... Link, 71 ... Key, 711, 712 ... End, 72 ... key, 721・
... Tip part, 722... Magnet. Patent Applicant Co., Ltd. Japan Auto Parts Research Institute Patent Application Agent Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Matsushita Akira Yamaguchi Figure 1 Figure 3 Figure 4 (B) Box = Ko

Claims (1)

[Claims] 1. A key cylinder fixing part fixed to a car door made of a non-magnetic material, and a key cylinder fixing part made of a non-magnetic material when a key that can generate a magnetic field is inserted into the key cylinder fixing part. A key cylinder rotating part that can be rotated and unlocked, a magnetic resistance element attached to the key cylinder fixing part, and a detection electric circuit that receives a signal from the magnetic resistance element. A key discriminating device, characterized in that when the key cylinder is inserted into a rotating part of the key cylinder, a change in the resistance value of the magnetoresistive element due to a magnetic field generated by the cylinder is detected, and the key is discriminated. 2. The device according to claim 1, wherein the node is made of a magnetized magnetic material. 3. The device according to claim 1, wherein the tube is made of a non-magnetic material with a magnet embedded at its tip. 4. The detection electric circuit includes a switch that is turned on to supply power when the cylinder is inserted into the =r-cylinder rotating section. Device.