JP3009596B2 - Key device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key device provided with a signal generator for generating a signal containing specific information.

[0002]

2. Description of the Related Art For example, as an example of an ignition switch of an automobile, when a key plate of a key device is inserted into a key cylinder of an ignition switch, power is supplied from the key cylinder side to the key device side, and the power is supplied to the key device side. Is configured to generate a signal including specific information and transmit it to the vehicle (key cylinder) side (specifically, Japanese Patent Publication No.
No. 15141). In this configuration, the vehicle is configured to determine whether the inserted key device is appropriate based on detecting the transmitted signal and determining the information, thereby preventing unauthorized unlocking. Useful for

FIGS. 6 and 7 show a conventional structure of the key device. In FIG. 6, the key device 1 includes a key plate 2
And a key grip 3 formed of resin on the base end 2a of the key plate 2. Inside the key grip 3, a signal generator 4 is molded and buried with resin while being positioned at the base end 2a of the key plate 2 via the holder 5. Here, as shown in FIG. 7, the signal generating device 4 is configured by molding a device in which an IC 7 and a magnetic antenna 8 are mounted on a printed wiring board 6 with a resin, and has a rectangular block-shaped molded body. Is composed. The magnetic antenna 8 is composed of, for example, a round bar-shaped ferrite core 8a and a coil 8b wound around the ferrite core 8a.

[0004]

However, in the above-mentioned conventional configuration, when positioning and molding the signal generator 4 formed of a rectangular block-shaped molded body at the base end 2a of the key plate 2, a separate component holder is used. 5, the number of parts and the number of assembling steps are large, and the manufacturing cost is high.

Accordingly, an object of the present invention is to reduce the number of parts and the number of assembly steps by eliminating the need for a positioning holder when positioning the primary molded signal generator at the base end of the key plate and performing secondary molding. It is to provide a key device that can be reduced.

[0006]

A key device according to the present invention is for generating a signal containing specific information. A signal generating device which is primarily molded with a resin is provided at a base end of a key plate with a resin. The signal generating device is provided with a positioning fitting part in a molded body formed by primary molding, and the molded body is fitted into a base end of the key plate. The present invention is characterized in that a fitted portion for fitting the mating portion and positioning the mold body is provided.

In this case, the fitting portion of the mold body is constituted by a fitting groove, and the fitting portion at the base end of the key plate is fitted into the fitting groove. It is preferable to constitute by. Further, when the signal generating device is primarily molded, it is more preferable that one end of the printed wiring board is made to protrude from the molded body.

[0008]

According to the above-mentioned means, a positioning fitting portion is provided on a molded body formed by primary molding of the signal generating device, and the fitting portion of the molded body is fitted to the base end of the key plate. Since the fitting portion for positioning the mold body is provided by using the configuration, the signal generator can be positioned only by fitting the fitting portion of the mold body to the fitting portion of the key plate. Therefore, when the signal generator is positioned at the base end of the key plate and the secondary molding is performed, the positioning holder, which was conventionally required, can be eliminated, thereby reducing the number of parts and the number of assembly steps. Can be.

In the above configuration, the fitting portion of the mold body is formed by a fitting groove, and the fitting portion at the base end of the key plate is formed by a fitting projection that fits into the fitting groove. With this configuration, the positioning configuration can be easily realized with a simple configuration. Furthermore, when the signal generator is primarily molded, if one end of the printed wiring board is configured to protrude from the mold body, it is possible to position the protruded one end by sandwiching it with a molding die. Positioning pins and the like can be dispensed with, the configuration of the molding die can be simplified, and the manufacturing cost can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to, for example, a key device of an automobile will be described below with reference to FIGS. First, in FIG. 3 showing a schematic overall configuration of the key device, a main body 11 of the key device is a key plate 12.
And a key grip 13 formed of resin on the base end 12a of the key plate 12. The key plate 12 is inserted into, for example, a key cylinder (not shown) of an ignition switch of an automobile to switch the ignition switch.

Further, inside the key grip 13,
A signal generator 14 having a substantially rectangular block shape as a whole.
Is buried. As shown in FIG. 1, the signal generating device 14 includes a molded body 16 in which a printed wiring board 15 is molded with a resin. On the printed circuit board 15 are mounted a magnetic antenna for receiving or transmitting magnetism and electric components such as an IC (both not shown). And the printed wiring board 1
5 is that both end portions 15a are both side portions 1 of the mold body 16.
It is configured to be molded so as to protrude from 6a.

Here, both side surfaces 1 of the mold body 16
On both sides 16b different from 6a, fitting portions 17, 17 for positioning are provided. In this case, the fitting portion 1
7 is constituted by a fitting groove 18, for example. The fitting groove 18 includes two protrusions 16 c and 16 d protruding from both ends on the upper side of the side surface 16 b of the mold body 16,
This is a groove surrounded by one convex portion 16e protruding from the lower intermediate portion of the side surface portion 16b (see FIGS. 1 and 2).

The magnetic antenna mounted on the printed wiring board 15 includes, for example, a round ferrite core and a coil wound around the ferrite core. The coil of the magnetic antenna is provided on the side of the key cylinder when the key plate 12 is inserted into the key cylinder, and a transmission coil for transmitting, for example, a specific code signal which is a signal including specific information. And a power receiving coil (not shown) that is magnetically coupled to the power receiving coil. Further, an electric component such as an IC is an electric component which operates by the electric power received by the coil to generate the specific code signal and forms an electric circuit for transmitting the code signal from the coil.

On the other hand, the feeding coil on the key cylinder side of the vehicle also serves as a receiving coil for receiving the code signal transmitted from the coil of the magnetic antenna. A power supply circuit for supplying power to the power supply coil and a control circuit for controlling the power supply circuit are provided on the side of the key cylinder, and a reception signal (code signal) received by the power supply coil is detected and an appropriate signal is detected. A detection circuit and a discrimination circuit for discriminating whether or not the signal is provided are provided. Also, the key plate 12 inserted into the key cylinder
When it is determined that is not a regular one, the engine is prevented from starting. The specific structure of the electric circuit on the key cylinder side and the electric circuit on the key device side are well-known technologies.
No. 1 publication. The present applicant has previously filed Japanese Patent Application No. 6-145905 as an improvement of the configuration described in Japanese Patent Publication No. 4-151141.

Now, the base end 12a of the key plate 12
Is formed in a substantially U-shape as shown in FIG.
It has a base 12b and opposed protruding pieces 12c and 12d. A recess 12e is formed at an end of the base 12b on the side of the protruding pieces 12c and 12d. The signal generator 14 is disposed between the projecting pieces 12b and 12c.
Is inserted and attached. Specifically, by fitting the protruding pieces 12c and 12d into the fitting grooves 18 of the molded body 16, the molded body 16 is attached to the base end 12a of the key plate 12 and positioned. I have.

In this case, the protruding pieces 12c and 12d constitute a fitted portion. Further, when the protruding pieces 12c and 12d are fitted into the fitting grooves 18 of the mold body 16, they may be press-fitted. Alternatively, a configuration in which the two are merely inserted and fitted may be employed. In this case, it is also preferable to adopt a configuration in which the two are fitted together, for example, with an adhesive.
In addition, as described above, the mold body 16 is
2, the one end 15a of the printed wiring board 15 protruding from the side surface 16a of the molded body 16 is connected to the recess 12 of the base 12b of the base end 12a.
e (see FIG. 3). Then, in the mounting (positioning) state described above, the key plate 1
2 and the signal generator 14 (the mold 1
The key grip 13 (and thus the main body 11) is formed by secondary molding of 6) with resin.

According to this embodiment having such a configuration, when the signal generator 14 is primarily molded, fitting grooves 18 are provided on both side surfaces 16b of the molded body 16 as fitting portions 17 for positioning. Base end 12 of key plate 12
a is a protruding piece portion 12c as a fitted portion that fits with the fitting portion 18 of the mold body 16 to position the mold body 16;
12d is provided. As a result, the signal generator 14 (that is, the molded body 16) can be mounted on the base of the key plate 12 simply by fitting the fitting grooves 18 of the molded body 16 into the protruding pieces 12c and 12d of the base end 12a of the key plate 12. Positioning on the end 12a becomes possible. As a result,
When positioning the signal generator 14 at the base end 12a of the key plate 12 and performing secondary molding, the positioning holder 5 (see FIG. 6), which was conventionally required, can be dispensed with. The number of assembly steps can be reduced.

In the above embodiment, the signal generator 14
When the first molding is performed, both end portions 15a of the printed wiring board 15 are configured to protrude from both side surfaces 16a of the molded body 16, so that the protruding end portions 15a are sandwiched between molding dies (for example, upper and lower dies). Positioning becomes possible. For this reason, since positioning pins and the like can be eliminated, the configuration of the molding die can be simplified, and the manufacturing cost of the signal generator 14 can be reduced accordingly.

In the above embodiment, the printed wiring board 1
5 is made to protrude from both side portions 16a of the molded body 16, but instead, only one end of the printed wiring board 15 is
It may be configured to protrude from one of the side portions 16a. In this case, substantially the same operation and effect can be obtained. Further, in the above embodiment, when the signal generating device 14 is molded, the injection molding method using a molding die is employed, but the present invention is not limited to this, and an immersion molding method may be employed. Also in this case, one end 15a of the printed wiring board 15 for projecting from the mold body.
Since the printed wiring board 15 can be immersed and molded while gripping, the molding operation is simplified.

FIGS. 4 and 5 show a second embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the second embodiment, the signal generator 1
As shown in FIG. 4, a signal generating device 19 in place of a printed circuit board 20 made of a ferrite substrate is used.
And an IC 21 mounted on the printed wiring board 20
And the like, and a coil 22 wound around one end of the printed wiring board 20. In this case, the printed wiring board 20 and the coil 22 constitute the magnetic antenna 23. The printed wiring board 20 on which the IC 21 and the like are mounted and the coil 22 is wound is molded as a rectangular block-shaped molded body by being molded with resin.

More specifically, as shown in FIG. 5, the left and right ends 20a and 20b of the printed wiring board 20 are
The resin is injected and filled into the cavities of the molds 24 and 25 while being fixed by being sandwiched between the molds 4 and 25. Thereby, the left and right end portions 20a of the printed wiring board 20 are separated from the left and right end surface portions of the molded body.
And 20b are configured to protrude. Further, fitting grooves having the same shape as the fitting groove 18 of the first embodiment are provided on different side surfaces of the mold body. still,
The configuration other than the above is the same as the configuration of the first embodiment.

Therefore, in the second embodiment, substantially the same operation and effect as those of the first embodiment can be obtained.
In particular, in the second embodiment, the printed wiring board 20 of the signal generator 19 is formed of a ferrite board, and the coil 22 is wound around one end of the printed wiring board 20 to form the magnetic antenna 23. Therefore, while keeping the configuration of the signal generator 19 small, the cross-sectional area of the ferrite core (ferrite substrate) of the magnetic antenna 23 is reduced in the first embodiment and the magnetic antenna 8 of the conventional configuration (see FIG. 7). Can be larger than the cross-sectional area of the ferrite core 8a. Therefore, the magnetic antenna 23
Can be greatly improved as compared with the sensitivity of the magnetic antenna 8 described above. Since the printed wiring board 20 is also used as a ferrite core of the magnetic antenna 23, the number of components can be reduced, and the configuration of the signal generator 19 can be further reduced.

[0023]

As is apparent from the above description, according to the present invention, a positioning body is provided on a molded body formed by primary molding of a signal generating device, and the mold is provided at a base end of a key plate. Because it is configured to provide a fitted part that fits with the fitting part of the body and positions the mold body,
The signal generator can be positioned simply by fitting the fitting part of the molded body to the fitting part of the key plate, eliminating the need for a positioning holder that was conventionally required during secondary molding. And an excellent effect of reducing the number of parts and the number of assembling steps can be achieved.

In the above configuration, the fitting portion of the mold body is formed by a fitting groove, and the fitting portion at the base end of the key plate is formed by a fitting projection that fits into the fitting groove. With this configuration, the positioning configuration can be specifically realized with a simple configuration. Furthermore, when the signal generator is primarily molded, if one end of the printed wiring board is configured to protrude from the mold body, it is possible to position the protruded one end by sandwiching it with a molding die. Positioning pins and the like can be eliminated, the configuration of the molding die can be simplified, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a key plate and a signal generating device according to a first embodiment of the present invention.

FIG. 2 is a side view of a key plate and a signal generator.

FIG. 3 is a perspective view of a key device.

FIG. 4 is a perspective view of a signal generator according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional side view of a signal generator and a molding die.

FIG. 6 is a diagram corresponding to FIG. 3 showing a conventional configuration.

FIG. 7 is a perspective view of a signal generator.

[Explanation of symbols]

11 is a main body, 12 is a key plate, 12a is a base end, 1
2b is a base, 12c and 12d are protruding pieces (fitted parts), 1
3 is a key grip, 14 is a signal generator, 15 is a printed wiring board, 16 is a molded body, 16a and 16b are side portions, 16c, 16d and 16e are convex portions, 17 is a fitting portion,
8 is a fitting groove, 19 is a signal generator, 20 is a printed wiring board, 22 is a coil, 23 is a magnetic antenna, 24, 2
Reference numeral 5 denotes a molding die.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 25/04 E05B 19/00 E05B 49/00

Claims (3)

(57) [Claims] 1. A key device for generating a signal containing specific information, wherein the signal generator is primarily molded with a resin, and the signal generator is secondarily molded with a resin at a base end portion of a key plate. In the above, a positioning fitting portion is provided on a molded body formed by primary molding the signal generating device, and a fitting portion of the molded body is fitted to a base end of the key plate and the molded body. A key device characterized in that a fitting portion for positioning the key is provided. 2. The fitting portion of the mold body is formed by a fitting groove, and the fitted portion at the base end of the key plate is formed by a fitting protruding portion fitted into the fitting groove. 2. The key device according to claim 1, wherein: 3. The key device according to claim 1, wherein one end of the printed wiring board is projected from the molded body when the signal generating device is primarily molded.