JP2021123966A - Smart key for automobile - Google Patents

Abstract

To provide a smart key for automobiles which can stop the transmission of weak radio waves emitted from the smart key with a simple operation even while having a simple structure, thereby preventing theft of automobiles by unauthorized use of the weak radio waves and reducing the consumption of power sources such as batteries used in the smart key and batteries.SOLUTION: A smart key 1 for an automobile, which includes: a smart key enclosure 10; a processing unit 20 made up of a control board installed in the smart key enclosure and performing processing for authentication related to unlocking/locking and starting of the automobile; a power source 30 that supplies electricity to the processing unit; and a built-in key 40 made up of a gripping portion 42 and a built-in key body 44 made of an electrically conductive material, and fitted in the smart key enclosure in a detachable manner, is configured such that the power source is electrically connected or optionally disconnected through the electrically conductive built-in key body, thereby establishing/interrupting a supply of electricity to the processing unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a smart key for an automobile, and in particular, prevents theft of an automobile by illegally using a weak radio wave emitted from the smart key, and suppresses the consumption of a power source such as a battery or a battery used in the smart key. Regarding smart keys for automobiles that made it possible.

Conventionally, many remote keys using a keyless entry system that enables opening and closing of a car key from a place away from the car have been developed and used. In particular, in recent years, smart keys that enable wireless communication between a key possessed by a user and an automobile to unlock / lock a door and start an engine have been widely used.

The smart key constantly emits a weak radio wave, and when the user holding the smart key approaches the car vehicle, the smart key and the car vehicle body communicate with each other within about 1 meter to identify the encrypted radio wave. By performing the authentication process, it is possible to unlock or lock the door or start the engine by simply holding a hand over the door knob or pressing a button without directly operating the key. It is a thing.

Since the smart key has such a configuration, in recent years, theft crimes of stealing the car by stealing the weak radio waves emitted by the smart key and illegally unlocking the car door and starting the engine have occurred. There is. As a typical example of misuse, for example, a relay attack uses a special receiver to pick up a weak radio wave from a smart key located away from a car, and uses the receiver as a relay point to pick up the weak radio wave of the car body. There is an example in which the main body of an automobile erroneously recognizes the radio wave emitted from the smart key and permits the door to be unlocked and the engine to be started by performing an operation of transmitting a radio wave to the vehicle.

A code grabber is a device that automatically reads a weak radio wave constantly emitted from a smart key and copies the ID code of the smart key. As a result, it becomes effective as a spare key for the smart key, and it is possible to unlock the door illegally and start the engine.

All of these theft methods are carried out by illegally acquiring weak radio waves emitted from smart keys. Therefore, a technique for preventing such illegal acquisition of weak radio waves has been developed.

For example, Japanese Patent Application Laid-Open No. 2019-217119 is a smart key radio wave leakage prevention tool for preventing vehicle theft due to a relay attack, and has a structure in which the entire smart key is covered by a radio wave shield bag. It has a cylinder that is passed through the insertion slot, and the radio wave of the smart key is trapped in the radio wave shield bag by a simple one-touch operation that opens and closes the opening on one end side of the cylinder with the lid. The structure of the radio wave leakage prevention device of the smart key, which can be emitted to the outside or can be emitted to the outside, and the radio waves emitted from the smart key to the outside are concentrated at one point, is disclosed.

Certainly, according to this technology, it is possible to prevent the weak radio waves emitted from the smart key from leaking to the outside, but the smart key itself must be wrapped with another member, which is complicated in use and the key is In addition to the bulky problem, there was a problem that it was difficult to completely prevent the leakage of weak radio waves.

Further, Japanese Patent Application Laid-Open No. 2018-53489 is a smart key system that changes the security against a relay attack according to necessity, and includes authentication information unique to the portable device and a detection value consisting of radio wave strength. A signal is transmitted to the vehicle, the portable device is authenticated based on the authentication information received by the vehicle, and when the detected value is equal to or less than the predetermined threshold, the door is unlocked or the vehicle is started, and the signal is not equal to or less than the predetermined threshold. Occasionally, a configuration is disclosed that prohibits unlocking the door and starting the vehicle, and a configuration including a setting changing unit that changes the threshold value in response to an external request.

Certainly, with this technology, it is possible to improve the security against relay attacks, but it is inevitable that IDs will be leaked due to weak radio waves, and the possibility of unauthorized operation by code grabber is completely eliminated. There was an inherent problem of not being able to do it.

Therefore, it has been desired to develop a smart key that can prevent the theft of a car equipped with a mechanism for preventing unauthorized use of weak radio waves emitted from the smart key more effectively.

JP-A-2019-217119 JP-A-2018-53489

The present invention is a smart key for automobiles, and in particular, although it has a simple structure, it is possible to stop the transmission of weak radio waves emitted from the smart key by a simple operation, and the weak radio waves are illegally used. It is an object of the present invention to provide an automobile smart key that can prevent the theft of an automobile and can suppress the consumption of power sources such as batteries and batteries used in the smart key.

In order to achieve the above object, the automobile smart key according to the present invention communicates between the automobile and the electronic key of the automobile to unlock / lock the automobile and certify the activation of the automobile. The smart key for an automobile is a processing unit including a smart key housing, a control board installed in the smart key housing, and a control board for performing authentication related to unlocking / locking and activation of the automobile. It consists of a power supply that supplies electricity to the processing unit, and a built-in key formed by a grip portion that is detachably / mountably fitted in the smart key housing and a built-in key body, and the power supply is electrically conductive. It is configured to supply or cut off electricity to the processing unit by electrically connecting or arbitrarily shutting off through the built-in key main body having the above.

Further, in order to supply or cut off electricity from the power source to the processing unit, the automobile smart key has a first connection portion including a lead wire for electrically connecting one electrode of the power supply and the processing unit, and a power supply. A second connection portion that electrically connects or cuts off the other electrode of the built-in key body and the tip of the built-in key body, and a third connection part that electrically connects or cuts off the side surface of the built-in key body and the processing unit. , Is provided.

Further, the second connection portion includes a joint portion that is freely contacted / separated from the tip of the built-in key body, and a conducting wire that electrically connects the joint portion and the power supply. , The first terminal that is electrically connected to the conducting wire, the second terminal that is connected to the first terminal and the tip of the built-in key body so as to be contactable / separated, and the second terminal that can be moved up and down. The moving portion, the first terminal pushing-up elastic member that biases the first terminal toward the second terminal, and the second terminal pressing that biases the second terminal in a direction away from the tip of the built-in key body. It is composed of an elastic member and a moving portion pushing-up elastic member that urges the moving portion toward the tip of the built-in key body. When the built-in key is separated from the smart key housing, the moving portion is moved. The second terminal is separated from the tip of the built-in key main body, and is separated from the first terminal to release the energization between the second connection portion and the third connection portion, and the built-in key is put into the smart key housing. When inserting, the moving portion moves by pressing the tip of the built-in key body, so that the second terminal comes into contact with the first terminal and the tip of the built-in key body is pressed to touch the second connecting portion. And the third connection part are energized.

Further, the second connection portion includes a joint portion that is freely contacted / separated from the tip of the built-in key body, and a conducting wire that electrically connects the joint portion and the power supply. It is made of a leaf spring made of a conductive material, and when the built-in key is separated from the smart key housing, the leaf spring is separated from the tip of the built-in key main body to form a second connection portion and a third connection portion. When the built-in key is inserted into the smart key housing by releasing the energization of the built-in key, the second connection portion and the third connection portion are brought into contact with each other by pressing the tip of the built-in key body against the leaf spring. It is also configured to be energized.

The automobile smart key is a built-in key attachment / detachment mechanism including a notch formed in the grip portion and a protrusion that can be projected / retracted by a button installed in the smart key housing. The built-in key is fixed in the smart key housing by projecting the protrusion and engaging with the notch, and the protrusion is pulled in to release the engagement with the notch. The structure is provided with a built-in key attachment / detachment mechanism in which the built-in key is detached from the inside of the smart key housing.

Further, the built-in key attachment / detachment mechanism allows the user to select contact / separation between the tip of the built-in key main body and the joint portion when the built-in key is held in the smart key housing. The portion is separated from the first missing portion, which is cut at a position where the protrusion is corresponding at a position where the tip of the built-in key body contacts the joint, and the tip of the built-in key body is separated from the joint. It is composed of a second notch portion in which the protrusion is cut at a corresponding position at the position, and can be held in a state where the energization is cut off.

Further, the third connection portion includes a side surface joint portion that is contactably / separatedly connected to the side surface of the built-in key main body, and a conducting wire that electrically connects the side surface joint portion and the processing portion. The side joint is a third terminal extruded elastic member composed of a third terminal that electrically connects or cuts off the side surface of the built-in key body and an elastic member that urges the third terminal toward the side surface of the built-in key body. And, it is composed of.

Since the present invention has the configuration as described in detail above, it has the following effects.
1. 1. Since the current from the power supply flows to the processing unit via the built-in key body having electrical conductivity, it is possible to switch between transmitting and stopping weak radio waves simply by inserting and removing the built-in key. Moreover, since the processing unit is not energized by removing the built-in key, the power supply can be saved.
2. Since the second connection part that electrically connects or cuts off the electrode of the power supply and the tip of the built-in key body is provided, it is possible to switch between transmitting and stopping weak radio waves by simply inserting and removing the built-in key.

3. 3. The built-in key is configured to energize the built-in key body that comes into contact with the second terminal by contacting the first terminal connected to the lead wire from the power supply and the second terminal that is held so that it can be moved up and down by the moving part. It is possible to control the energization by moving the moving part with the movement of the moving part. In addition, since the elastic member is used to push down the second terminal and push up the moving part, the built-in key is pushed out by urging it in the direction of pulling out the built-in key, and the operation of pulling the first terminal and the second terminal apart at the same time. It becomes possible to do.
4. Since the joint of the second connection is a leaf spring, the leaf spring acts as a cushion when the built-in key is stored in the smart key housing 10, and the leaf spring acts as a cushion when the built-in key is pulled out. It is possible to cut off and release the energization between the second connection portion and the third connection portion at a distance from the tip of the.

5. Since the protrusion is engaged with the notch cut in the grip portion, the built-in key is held in the smart key housing at the time of these engagements, and the electricity from the power supply is energized to the processing portion. When the engagement is released by the button, the joint portion presses the built-in key with an elastic member or a leaf spring to separate the joint portion, so that the energization between the second connection portion and the third connection portion can be cut off and released.
6. Since the notch is provided with a first notch and a second notch, when the protrusion engages with the first notch, the processing portion can be energized and the protrusion engages with the second notch. At the time of matching, it is possible to hold the built-in key in the smart key housing while releasing the power supply to the processing unit.

7. Since the side joint is provided in the third connection part, it is possible to press and contact the terminal with the side surface of the built-in key, and prevent poor contact between the side surface of the built-in key body and the terminal due to long-term use of the smart key. Can be done.

Hereinafter, the smart key for automobiles according to the present invention will be described in detail based on the examples shown in the drawings. FIG. 1 is a front sectional view of an automobile smart key according to the present invention, and FIG. 2 is a front sectional view of an automobile smart key when the built-in key is removed. FIG. 3 is a front sectional view of an automobile smart key in which the built-in key is held in a smart key housing in a blocked state, and FIG. 4 is a front sectional view of an automobile smart key having a leaf spring at a joint. ..

As shown in FIG. 1, the automobile smart key 1 according to the present invention includes at least a smart key housing 10, a processing unit 20, a power supply 30, and a built-in key 40, and includes an automobile and the smart key of the automobile. It is a smart key for automobiles that unlocks / locks an automobile by communicating with an electronic key consisting of an electronic key, or authenticates for starting an engine of an automobile.

The smart key housing 10 is a housing that serves as an outer frame of a smart key for an automobile, and in this embodiment, it is a hollow resin box-shaped member having a portable size. Further, the processing unit 20 is a control board installed inside the smart key housing 10, and is a member that performs processing for unlocking / locking the door of an automobile and authentication related to the start of the vehicle.

In this embodiment, the processing unit 20 transmits an encrypted signal for authentication with the vehicle body. The smart key is configured to constantly emit weak radio waves, and when a user holding the smart key approaches an automobile vehicle, the smart key and the automobile communicate with each other, and the smart key processing unit 20 puts the smart key on the weak radio waves constantly emitted. After the automobile receives the received signal, the signal is decoded and the authentication process is performed.

The power supply 30 is a member installed inside the smart key housing 10 and supplies electricity to the processing unit 20. In this embodiment, since the smart key housing 10 has a portable size, a button-type or coin-type battery is used, but the present invention is not limited to this, and a small rechargeable battery is used. It is also possible to use it.

The built-in key 40 is a physical key for unlocking and locking an automobile door that is detachably / mounted in a smart key housing, and includes a grip portion 42 and a built-in key main body 44. The grip portion 42 is a handle of the built-in key 40, and is made of the same resin material as the smart key housing 10 in this embodiment. Further, the built-in key main body 44 is a main body portion of the built-in key 40 provided with a groove or a mountain of a key, and in this embodiment, it is made of a material having electrical conductivity.

In the automobile smart key 1 according to the present invention, the power supply 30 and the processing unit 20 are electrically connected to form an electric circuit, and in the middle of the circuit, an electrically conductive built-in key main body 44 is used. It is configured to be electrically connected or arbitrarily cut off. As a result, electricity is not always supplied to the processing unit 20, but electricity from the power supply 30 can be supplied or cut off to the processing unit 20 by moving the built-in key body 44 in and out like a switch. ing. With this configuration, it is possible to switch between transmitting and stopping weak radio waves only by inserting and removing the built-in key 40 into and from the smart key housing 10. Further, since the energization of the processing unit 20 is stopped by turning off the built-in key 40, it is possible to save power consumption.

An electric circuit formed by electrically connecting the power supply 30 and the processing unit 20 will be described. As shown in FIG. 1, the automobile smart key 1 according to the present invention includes a first connection unit 100, a second connection unit 200, and a third connection unit 300, and includes these, a processing unit 20, and a power supply 30. Consists of an electric circuit.

The first connection unit 100 is composed of a conducting wire that electrically connects one electrode 32 of the power supply 30 and the processing unit 20. Further, the second connection portion 200 is a member that electrically connects or cuts off the other electrode 34 of the power supply 30 and the tip 46 of the built-in key main body 44. Further, the third connection unit 300 is a member that electrically connects or cuts off the side surface 48 of the built-in key main body 44 and the processing unit 20. With this configuration, it is possible to cut off a part of the electric circuit, and it is possible to supply or cut off the electricity from the power source 30 to the processing unit 20.

In this embodiment, the second connecting portion 200 includes a joining portion 210 and a conducting wire 220, as shown in FIG. The joint portion 210 is a member that is freely contacted / separated from the tip 46 of the built-in key body 44, and the conducting wire 220 is a member that electrically connects the joint portion 210 and the power supply 30.

As shown in FIG. 1, the joint portion 210 includes a first terminal 212a, a second terminal 212b, and a moving portion 214, which are a first terminal push-up elastic member 216a and a second terminal push-up elastic, respectively. It is urged by the member 216b and the moving portion push-up elastic member 218.

The first terminal 212a is a terminal that is electrically connected to the conducting wire 220, and has a configuration in which it can be electrically connected in contact with the second terminal 212b. Further, the second terminal 212b is a terminal that is freely contacted / separated from both the first terminal 212a and the tip 46 of the built-in key main body 44, and both ends of the second terminal 212b are connected to the first terminal 212a. It is configured to be electrically connectable to both the tip 46 of the built-in key body 44.

The moving portion 214 is a member that holds the second terminal 212b so as to be movable up and down, and in this embodiment, it is made of a material having no electrical conductivity such as a resin material. The moving unit 214 allows the second terminal 212b to move to the tip 46 side of the built-in key body 44 (upward movement) or to the first terminal 212a side (downward movement). It is a configuration to be held in. Specifically, the moving portion 214 has a configuration in which the built-in key 40 comes into contact with the tip 46 of the built-in key main body 44 when the built-in key 40 is housed in the smart key housing 10, and the second terminal 212b is formed in the moving portion 214. It is electrically connected to the tip 46 of the built-in key body 44 through the provided opening.

The first terminal push-up elastic member 216a is a member for urging the first terminal 212a in the direction of the second terminal 212b, and in this embodiment, it is composed of a spring such as a coil, but is not limited to this. No. In this embodiment, the first terminal push-up elastic member 216a has a configuration in which the lower end is joined to the smart key housing 10 and the upper end is joined to the first terminal 212a, as shown in FIG. As a result, the first terminal 212a is urged so as to be vertically movable in the direction of the second terminal 212b.

The second terminal pressing elastic member 216b is a member for urging the second terminal 212b in a direction away from the tip 46 of the built-in key main body 44, and in this embodiment, it is composed of a spring such as a coil. It is not limited to. In this embodiment, as shown in FIG. 1, the second terminal pressing elastic member 216b is formed of a coil spring, and the upper end is joined to the surface of the moving portion 214 in contact with the built-in key body 44 and the lower end is the second. Join to terminal 212b. The second terminal 212b is configured to penetrate the second terminal pressing elastic member 216b, project toward the tip 46 of the built-in key body 44, and penetrate the opening of the moving portion 214.

Since the second terminal 212b is urged by the second terminal pressing elastic member 216b in a direction away from the tip 46 of the built-in key body 44, when no force is applied to the moving portion 214, the second terminal 212b Is embedded in the opening of the moving portion 214. When the built-in key main body 44 is inserted into the smart key housing 10, the tip 46 of the built-in key main body 44 comes into contact with the moving portion 214, and a downward force is applied to the moving portion 214 to move, the lower end of the second terminal 212b Touches the first terminal 212a. At this time, since the first terminal 212a is urged in the direction of the second terminal 212b, the second terminal pressing elastic member 216b contracts, the second terminal 212b protrudes from the opening of the moving portion 214, and the built-in key main body 44 It comes into contact with the tip 46.

The moving portion push-up elastic member 218 is a member for urging the moving portion 214 toward the tip 46 of the built-in key body 44, and in this embodiment, it is composed of a spring such as a coil, but is limited to this. There is no. In this embodiment, as shown in FIG. 1, one end in the urging direction is joined to the smart key housing 10, and the other end is joined to the moving portion 214. As a result, the moving portion 214 is urged so as to be vertically movable in the direction of the tip 46 of the built-in key main body 44.

Next, the operation of the joint portion 210 will be described. The automobile smart key 1 according to the present invention is usually used in a state where the built-in key 40 is inserted and stored in the smart key housing 10. At this time, as shown in FIG. 1, the moving portion 214 of the joint portion 210 is moved to the first terminal 212a side by pressing the built-in key 40. The first terminal 212a is in contact with the second terminal 212b, and the second terminal pressing elastic member 216b is compressed so that the second terminal 216b protrudes from the opening of the moving portion 214 and is in contact with the tip 46 of the built-in key body 44. It has become. As a result, the second connection unit 200 and the third connection unit 300 are energized, so that electricity is supplied to the processing unit 20, and the processing unit 20 of the automobile smart key 1 is used to authenticate the weak radio wave with the automobile body. An encrypted signal is carried and always emitted to the outside.

When the built-in key 40 is detached from the smart key housing 10, as shown in FIG. 2, the moving portion 214 moves in the direction of the tip 46 of the detached built-in key main body 44 due to the urging of the moving portion push-up elastic member 218. At this time, the second terminal 212b is electrically cut off at a distance from the tip 46 of the built-in key main body 44. Further, the first terminal 212a and the second terminal 212b are separated from each other to be released from contact with each other, and are electrically cut off. Further, since the pressing by the first terminal 212a is released, the second terminal 212b moves to the first terminal 212a side by the urging of the second terminal pressing elastic member 216b. As a result, the second terminal 212b is pulled in through the opening of the moving portion 214, and the tip 46 of the built-in key main body 44 and the second terminal 212b are surely separated from each other. By this series of operations, the energization between the second connection portion 200 and the third connection portion 300 is released.

When the built-in key 40 is inserted into the smart key housing 10, as shown in FIG. 1, the tip 46 of the built-in key main body 44 presses the moving portion 214, so that the moving portion 214 moves in the direction of the first terminal 212a. do. Along with this movement, the second terminal 212b comes into contact with the first terminal 212a and can be energized. At this time, the second terminal 212b urged in the direction of the first terminal 212a by the second terminal pressing elastic member 216b is pushed out to the tip 46 side of the built-in key main body 44 through the opening by pressing the first terminal 212a. .. As a result, the second terminal 212b can be energized by pressing and contacting the tip 46 of the built-in key main body 44. Through this series of operations, the second connection unit 200 and the third connection unit 300 can be energized, and electricity can be supplied to the processing unit 20.

By configuring the automobile smart key 1 according to the present invention as described above, it is possible to transmit / stop a weak radio wave carrying an encrypted signal for authentication with the automobile body by simply inserting / removing the built-in key 40. Switching is possible.

Another embodiment of the automobile smart key 1 according to the present invention will be described. As shown in FIG. 3, the automobile smart key 1 has a second connecting portion 200 including a joint portion 230 and a conducting wire 220. The joint portion 230 is a member that is freely contacted / separated from the tip 46 of the built-in key body 44, and the conducting wire 220 is a member that electrically connects the joint portion 230 and the power supply 30.

In this embodiment, the joint portion 230 is made of a leaf spring 232 having electrical conductivity, as shown in FIG. The automobile smart key 1 according to the present embodiment is usually used in a state where the built-in key 40 is inserted and stored in the smart key housing 10. At this time, the joint portion 230 is in a state where it can be energized by contacting the tip 46 of the built-in key main body 44 while bending due to the pressing of the built-in key 40. As a result, the second connection unit 200 and the third connection unit 300 are energized, so that electricity is supplied to the processing unit 20, and the processing unit 20 of the automobile smart key 1 is used to authenticate the weak radio wave with the automobile body. An encrypted signal is carried and the signal is always transmitted to the outside. Further, since the leaf spring 232 is bent, the built-in key 40 can be easily taken out from the smart key housing 10.

When the built-in key 40 is separated from the smart key housing 10, the tip 46 of the built-in key main body 44 is separated from the leaf spring 232 and electrically cut off. As a result, the energization between the second connection portion 200 and the third connection portion 300 is released. In this embodiment, the smart key housing 10 is provided with a built-in key extrusion unit 60. As shown in FIG. 4, the built-in key extrusion portion 60 includes a built-in key extrusion elastic member 62 and an extrusion protrusion 64. The extrusion protrusion 64 is a member that comes into contact with the built-in key 40 when the built-in key 40 is housed in the smart key housing 10, and is pushed down to cause the built-in key extrusion elastic member 62 to contract. That is, the built-in key extrusion elastic member 64 is a member in which the extrusion protrusion 64 in contact with the built-in key 40 urges the built-in key 40 in the pushing direction. When the built-in key 40 is separated from the smart key housing 10, the extrusion protrusion 64 presses the built-in key 40 by the urging force of the built-in key extrusion elastic member 64, so that the built-in key 40 can be easily taken out.

When the built-in key 40 is inserted and stored in the smart key housing 10, the tip 46 of the built-in key main body 44 presses and contacts the leaf spring 232 to enable energization. As a result, the second connection portion 200 and the third connection portion 300 can be energized, and electricity can be supplied to the processing unit 20.

In another embodiment of the present invention, the automobile smart key 1 has a configuration including a built-in key attachment / detachment mechanism 50. The built-in key attachment / detachment mechanism 50 is a mechanism for making it easy to take out the built-in key 40 from the smart key housing 10, and as shown in FIGS. 1 to 4, a notch formed in the grip portion 42 of the built-in key 40. It is composed of 52 and a protrusion 54 that can be projected / retracted by a button 12 installed in the smart key housing 10. The notch 52 and the protrusion 54 are installed so as to engage with each other in a state where the built-in key 40 is stored and held in the smart key housing 10.

As shown in FIG. 1, the built-in key attachment / detachment mechanism 50 projects the protrusion 54 and engages with the notch 52 when the built-in key 40 is housed in the smart key housing 10. As a result, the built-in key 40 is fixed in the smart key housing 10. Since the built-in key 40 is subjected to an outward force from the smart key housing 10 due to the urging of the joint portions 210 and 230, the built-in key 40 is surely smart by engaging the protrusion 54 and the notch 52. It will be fixed in the key housing 10.

When the built-in key 40 is taken out from the smart key housing, the protrusion 54 is pulled in by pressing the button 12, and the engagement with the notch 52 is released. As a result, the built-in key 40 can be detached from the inside of the smart key housing 10. Since the built-in key 40 is subjected to an outward force from the smart key housing 10 by urging the joints 210 and 230, the built-in key 40 can be easily taken out from the smart key housing by pressing the button 12. It becomes possible.

With this configuration, when the protrusion 54 and the notch 52 are engaged, the built-in key 40 can be held in the smart key housing 10, and electricity from the power supply 30 is energized to the processing unit 20. When the engagement is released by the button 12, the joint portions 210 and 230 urge the built-in key 40 by an elastic member or a leaf spring to separate them from each other, thereby energizing the second connection portion 200 and the third connection portion 300. It is now possible to release the cutoff.

As shown in FIG. 1, the cutout portion 52 of the built-in key attachment / detachment mechanism 50 can be configured to include a first cutout portion 52a and a second cutout portion 52b. The first notch 52a is a concave notch cut at a position corresponding to the protrusion 54 at a position where the tip 46 of the built-in key main body 44 contacts the joints 210 and 230. Further, the second notch 52b is a concave notch cut at a position corresponding to the protrusion 54 at a position where the tip 46 of the built-in key main body 44 is separated from the joints 210 and 230.

As shown in FIG. 1, when the protrusion 54 is engaged with the first missing portion 52a, the built-in key 40 is fixed in a state where the tip 46 of the built-in key main body 44 is in contact with the joint portions 210 and 230. .. In this case, the second connection unit 200 and the third connection unit 300 are energized to supply electricity to the processing unit 20. On the other hand, when the protrusion 54 is engaged with the second notch 52b, the built-in key 40 is fixed in a state where the tip 46 of the built-in key main body 44 is separated from the joints 210 and 230, as shown in FIG. Will be done. In this case, the energization of the second connection unit 200 and the third connection unit 300 is cut off, the supply of electricity to the processing unit 20 is released, and the built-in key 40 is held without falling off from the smart key housing 10. NS.

That is, with this configuration, when the built-in key 40 is held in the smart key housing 10, the built-in key 40 does not fall off from the smart key housing 10, and the user can use the tip 46 of the built-in key main body 44. It has become possible to select contact / separation with the joints 210/230.

The third connection portion 300 of the automobile smart key 1 according to the present invention can be configured to include a side joint portion 310 and a conducting wire 320. As shown in FIG. 1, the side joint portion 310 is a member that is freely contacted / separated from the side surface 48 of the built-in key main body 44, and the conductor 320 electrically connects the side joint portion 310 and the processing portion 20. It is a member to be connected.

In this embodiment, the side joint portion 310 has a configuration including a third terminal 312 and a third terminal extruded elastic member 314. The third terminal 312 is a terminal that electrically connects or disconnects from the side surface 48 of the built-in key main body 44, and the third terminal extruded elastic member 314 urges the third terminal 312 toward the side surface 48 of the built-in key main body 44. It is an elastic member.

When the built-in key 40 is inserted into the smart key housing 10, the side surface 48 of the built-in key main body 44 comes into contact with the third terminal 312 while being pressed and can be energized. With this configuration, the smart key 1 for automobiles can be used for a long period of time, and in particular, the side surface 48 of the built-in key main body 44 due to repeated movements of putting in and taking out the built-in key 40 into and out of the smart key housing 10 for a long period of time. It has become possible to prevent poor contact of the third terminal 312, and it has become possible to prevent failure due to poor contact of the smart key housing 10.

Front sectional view of an automobile smart key according to the present invention Front sectional view of the smart key for automobiles when the built-in key is removed Front sectional view of an automobile smart key in which the built-in key is held in a smart key housing in a blocked state. Front sectional view of a smart key for automobiles with a leaf spring at the joint

1 Smart key for automobiles 10 Smart key housing 12 Button 20 Processing unit 30 Power supply 32 Electrode 34 Electrode 40 Built-in key 42 Grip part 44 Built-in key body 46 Tip 48 Side 50 Built-in key attachment / detachment mechanism 52 Notch 52a No. 1 notch 52b Second notch 54 Protrusion 60 Built-in key extrusion 62 Built-in key extrusion elastic member 64 Extrusion protrusion 100 First connection 200 Second connection 210 Joint 212a First terminal 212b Second terminal 214 Moving part 215 Opening 216a No. One terminal push-up elastic member 216b Second terminal push-up elastic member 218 Moving part Push-up elastic member 220 Lead wire 230 Joint part 232 Leaf spring 300 Third connection part 310 Side joint part 312 Third terminal 314 Third terminal Extruded elastic member 320 Lead wire

Claims (7)

An automobile smart key (1) that communicates between an automobile and an electronic key of the automobile to unlock / lock the automobile and authenticates the activation of the automobile.
A processing unit (20) composed of a smart key housing (10), a control board installed in the smart key housing that performs processing for authentication related to unlocking / locking and activation of the automobile, and the processing unit. A power supply (30) that supplies electricity to the smart key housing, and a built-in key (40) formed by a grip portion (42) that is detachably / mounted on the smart key housing and a built-in key body (44). Consists of
The power supply (30) is electrically connected to or arbitrarily cut off via a built-in key body (44) having electrical conductivity, thereby supplying or cutting off electricity to the processing unit (20). Automotive smart key. The automobile smart key (1) electrically supplies or cuts off electricity from the power supply (30) to the processing unit (20) by electrically connecting one electrode (32) of the power supply and the processing unit (20). A first connection (100) consisting of a conducting wire connected to the power supply, and a second connection (200) that electrically connects or cuts off the other electrode (34) of the power supply and the tip (46) of the built-in key body. The automobile according to claim 1, further comprising a third connection portion (300) for electrically connecting or disconnecting the side surface (48) of the built-in key main body and the processing unit (20). For smart keys. The second connection portion (200) electrically connects the joint portion (210), which is connected to the tip (46) of the built-in key body (44) so as to be contactable / separable, and the joint portion and the power supply (30). Consists of a lead wire (220) that connects
The joint portion (210) is connected to a first terminal (212a) that is electrically connected to the conducting wire (220) and a second terminal that is freely contacted / separated from the first terminal and the tip of the built-in key body. A terminal (212b), a moving portion (214) for holding the second terminal so as to be movable up and down, a first terminal push-up elastic member (216a) for urging the first terminal toward the second terminal, and the above. A second terminal pressing elastic member (216b) that urges the second terminal in a direction away from the tip of the built-in key body, and a moving portion pushing elastic member (216b) that urges the moving portion toward the tip of the built-in key body. 218) and
When the built-in key (40) is detached from the smart key housing (10), the second terminal (212b) is moved to the tip (46) of the built-in key body (44) by moving the moving portion (214). Separated from the first terminal (212a), the energization of the second connection portion (200) and the third connection portion (300) is cut off and released.
When the built-in key (40) is inserted into the smart key housing (10), the second terminal (214) is moved by pressing the tip (46) of the built-in key body (44) to move the moving portion (214). The second connection portion (200) and the third connection portion (300) are energized by the 212b) contacting the first terminal (212a) and pressing contact with the tip (46) of the built-in key body (44). The smart key for an automobile according to claim 2, wherein the smart key is made to be used. The second connection portion (200) includes a joint portion (230) that is freely contacted / separated from the tip end (46) of the built-in key body (44), and the joint portion (230) and the power supply (30). Consists of a conducting wire (220) that electrically connects and
The joint (230) is made of a leaf spring (232) made of a conductive material.
When the built-in key (40) is detached from the smart key housing (10), the leaf spring (232) is separated from the tip (46) of the built-in key main body (44) and is separated from the second connection portion (200). The power supply between the and the third connection (300) is cut off and released.
When the built-in key (40) is inserted into the smart key housing (10), the second connection is made by pressing the tip (46) of the built-in key body (44) against the leaf spring (232). The automobile smart key according to claim 2, wherein the unit (200) and the third connection unit (300) are energized. The automobile smart key (1) can be projected / retracted by a notch (52) cut in the grip portion (42) and a button (12) installed in the smart key housing (10). A built-in key attachment / detachment mechanism (50) composed of a protrusion (54), and the built-in key (40) becomes the smart when the protrusion (54) protrudes and engages with the notch (52). The built-in key (40) is fixed in the key housing (10), the protrusion (54) is pulled in, and the engagement with the notch (52) is released, so that the built-in key (40) becomes the smart key housing ( 10) The automobile smart key according to claim 1 to 4, further comprising a built-in key attachment / detachment mechanism (50) that can be detached from the inside. In the built-in key attachment / detachment mechanism (50), when the built-in key (40) is held in the smart key housing (10), the user can use the built-in key body (44) with the tip (46) and the joint portion. To be able to select contact / separation with (210/230)
The notch (52) is cut at a position where the protrusion (54) corresponds at a position where the tip (46) of the built-in key body (44) comes into contact with the joint (210/230). At a position where the completely missing portion (52a) and the tip end (46) of the built-in key body (44) are separated from the joint portion (210/230), the protrusion portion (54) is cut at a corresponding position. The smart key for an automobile according to claim 5, further comprising a second notch (52b) and a configuration capable of holding the key in a state in which energization is cut off. The third connection portion (300) includes a side surface joint portion (310) that is freely contacted / separated from the side surface (48) of the built-in key main body (44), and the side surface joint portion and the processing portion (20). Consists of a lead wire (320) that electrically connects and
The side surface joint (310) has a third terminal (312) that electrically connects or disconnects the side surface (48) of the built-in key body (44) and the third terminal of the built-in key body (44). The automobile smart key according to claim 3 to 6, further comprising a third terminal extruded elastic member (314) made of an elastic member urging in the side surface (48) direction.

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