JPH08133017A - Key device - Google Patents

Abstract

PURPOSE: To eliminate a holder for positioning so as to reduce number of part items and assembly manhour by providing fitting counterparts, which are fitted to fitting parts of a mold body so as to position the mold body, in a base end parts of a key plate. CONSTITUTION: Fitting grooves 18 of fitting parts 17 for positioning are provided in both side parts 16b which are in the different sides from both side faces 16a of a mold body 16 formed by primary molding a signal generator 14. On the other hand, projection parts 12c, 12d, which are fitting counterparts constituted by forming a base end part 12a of a key plate 12 into approximately U-shape are provided. The projections 12c, 12d are made to be fitted to the fitting grooves 18 of the mold body so as to position it. This constitution eliminates a holder for positioning, which is necessary for secondary molding, so as to reduce number of part items and assembly manhour.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key device having 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 the ignition switch, power is supplied from the key cylinder side to the key device side and the key device side is supplied by the power supply. There is one in which the signal generator provided in is configured to generate a signal containing specific information and transmit it to the vehicle (key cylinder) side (specifically, Japanese Patent Publication No.
-15141). With this configuration, the vehicle side is configured to determine the suitability of the inserted key device based on the detection of the transmitted signal and the determination of information, thereby preventing unauthorized unlocking. It is useful for

A conventional configuration of the above key device is shown in FIGS. 6 and 7. In FIG. 6, the key device 1 includes a key plate 2
And a key grip 3 made of resin on the base end portion 2a of the key plate 2. A signal generator 4 is embedded in the inside of the key grip 3 by being molded with resin while being positioned at the base end portion 2a of the key plate 2 via a holder 5. Here, as shown in FIG. 7, the signal generator 4 is configured by molding a resin on which a IC 7 and a magnetic antenna 8 are mounted on a printed wiring board 6, and a rectangular block-shaped molded body. Are configured. 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 structure, when the signal generator 4 formed of a rectangular block-shaped mold body is positioned and molded at the base end portion 2a of the key plate 2, a holder which is a separate component. Since 5 is required, there is a drawback that the number of parts and the number of assembling steps are large and the manufacturing cost is high.

Therefore, an object of the present invention is to eliminate the need for a positioning holder when positioning the primary-molded signal generator at the base end of the key plate for secondary molding, thereby reducing the number of parts and the number of assembly steps. It is to provide a key device that can be reduced.

[0006]

SUMMARY OF THE INVENTION A key device of the present invention is for generating a signal containing specific information, and a signal generator which is primarily molded with a resin is provided at the base end of the key plate. And a fitting part for positioning is provided on the molded body formed by primary molding the signal generating device, and the molded body is fitted on the base end of the key plate. The present invention is characterized in that a fitted portion for fitting the joint portion and positioning the mold body is provided.

In this structure, the fitting portion of the mold body is formed by the fitting groove, and the fitting portion of the base end portion of the key plate is fitted in the fitting groove. It is preferable that Further, it is an even more preferable configuration to project one end of the printed wiring board from the molded body when the signal generator is first molded.

[0008]

According to the above-mentioned means, the fitting body for positioning is provided on the molded body formed by the primary molding of the signal generator, and the proximal end portion of the key plate is fitted with the fitting portion of the molded body. Since the fitted part for positioning the mold body is provided, the signal generator can be positioned only by fitting the fitting part of the mold body to the fitted part of the key plate. Therefore, when the signal generator is positioned at the base end portion of the key plate and the secondary molding is performed, it is possible to eliminate the need for a positioning holder that has been required in the past, thus reducing the number of parts and the number of assembly steps. You can

Further, in the case of the above construction, the fitting portion of the mold body is constituted by the fitting groove, and the fitted portion at the base end portion of the key plate is fitted by the fitting projection portion for fitting in the fitting groove. When configured, the positioning configuration can be easily realized with a simple configuration. Furthermore, when the signal generator is first molded, if one end of the printed wiring board is configured to project from the mold body, it is possible to position the projected one end by sandwiching it with a molding die. Positioning pins and the like can be eliminated, the structure 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, an automobile key device will be described below with reference to FIGS. First, referring to FIG. 3 showing a schematic overall configuration of the key device, the main body 11 of the key device is a key plate 12
And a key grip 13 made 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 which has a substantially rectangular block shape as a whole
Is buried. As shown in FIG. 1, the signal generator 14 comprises a molded body 16 obtained by molding a printed wiring board 15 with resin. On the printed wiring board 15, magnetic parts for receiving or transmitting magnetism and electric parts such as an IC (neither is shown) are mounted. And the printed wiring board 1
5, the both end portions 15a are both side surface portions 1 of the mold body 16.
It is configured to be molded so as to project from 6a.

Here, both side surfaces 1 of the molded body 16
Fitting portions 17, 17 for positioning are provided on both side surface portions 16b on the side different from 6a. In this case, the fitting part 1
7 is formed of, for example, a fitting groove 18. The fitting groove 18 has two protrusions 16c and 16d projecting from both end portions on the upper side of the side surface portion 16b of the mold body 16,
It is a groove surrounded by one convex portion 16e protrudingly provided in the lower middle portion of the side surface portion 16b (see FIGS. 1 and 2).

The magnetic antenna mounted on the printed wiring board 15 is composed of, for example, a rod-shaped 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 transmitting coil for transmitting a signal including specific information, for example, a specific code signal. The coil also serves as a power receiving coil for magnetically coupling with a power feeding coil (not shown) to receive power. Further, an electric component such as an IC is an electric component that operates by electric power received by the coil to generate the specific code signal and configures an electric circuit for transmitting the code signal from the coil.

On the other hand, the power feeding coil on the key cylinder side of the automobile 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 key cylinder side, and the received signal (code signal) received by the power supply coil is detected and appropriate. A detection circuit, a discrimination circuit, and the like for discriminating whether or not the object is provided are provided. In addition, the key plate 12 inserted in the key cylinder
Is determined to be non-genuine, the engine is prevented from starting. The specific configurations of the electric circuit on the key cylinder side and the electric circuit on the key device side are well known in the art, for example, Japanese Patent Publication No. 4-1514.
No. 1 publication. Further, the present applicant has previously filed Japanese Patent Application No. 6-145905 as an improvement of the configuration described in Japanese Patent Publication No. 4-15141.

Now, the base end portion 12a of the key plate 12
Is formed in a substantially U shape as shown in FIG.
It has a base portion 12b and opposing projecting piece portions 12c and 12d. A recess 12e is formed at the end of the base 12b on the side of the protruding pieces 12c and 12d. Then, the signal generating device 14 is provided between the protruding pieces 12b and 12c.
The mold body 16 is inserted and attached. Specifically, by fitting the protruding pieces 12c and 12d into the fitting groove 18 of the mold body 16, the mold body 16 is attached to the base end portion 12a of the key plate 12 and positioned. There is.

In this case, the protruding pieces 12c and 12d form the fitted portion. Further, when the projecting pieces 12c and 12d are fitted in the fitting groove 18 of the mold body 16, they may be press-fitted. Alternatively, the configuration may be such that only insertion and fitting are performed, and in this case, it is also preferable to adopt a configuration in which the two are bonded by, for example, an adhesive when fitting them.
As described above, the molded body 16 is attached to the key plate 1
When it is attached to the base end 12a of the second molded body 16, the one end 15a of the printed wiring board 15 protruding from the side surface 16a of the mold body 16 has the recess 12 of the base 12b of the base end 12a.
It is configured so as to fit into e (see FIG. 3). Then, in the above-mentioned mounted (positioned) state, the key plate 1
2 and the signal generator 14 (molded body 1
The key grip 13 (and hence the main body 11) is molded by secondary molding 6) with resin.

According to this embodiment having such a configuration, when the signal generator 14 is primarily molded, the fitting groove 18 is provided as the fitting portion 17 for positioning on both side surface portions 16b of the mold body 16, and Base end 12 of key plate 12
The protrusion 12c is a fitted portion for fitting the fitting portion 18 of the mold body 16 to the a to position the mold body 16.
12d is provided. As a result, the signal generator 14 (that is, the mold body 16) can be mounted on the base of the key plate 12 only by fitting the fitting grooves 18 of the mold body 16 into the protruding pieces 12c and 12d of the base end portion 12a of the key plate 12. It becomes possible to position at the end 12a. As a result,
When the signal generator 14 is positioned at the base end portion 12a of the key plate 12 and secondarily molded, the positioning holder 5 (see FIG. 6), which has been conventionally required, can be eliminated. The number of assembly steps can be reduced.

In the above embodiment, the signal generator 14 is used.
Since the both ends 15a of the printed wiring board 15 are projected from both side surface parts 16a of the molded body 16 when the first molding is performed, the projected end parts 15a are sandwiched by a molding die (for example, an upper and lower die). It becomes possible to position. Therefore, since the positioning pin and the like can be eliminated, the structure 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 is used.
Although both end portions 15a of No. 5 are made to project from both side surface portions 16a of the molded body 16, instead of this, only one end portion of the printed wiring board 15 is molded body 16a.
It may be configured to project from the one side surface portion 16a, and in this case, substantially the same operational effect can be obtained. Further, in the above-mentioned embodiment, when the signal generator 14 is molded, the method of injection molding using the molding die is adopted, but the method is not limited to this, and the immersion molding method may be adopted. Also in this case, one end portion 15a of the printed wiring board 15 for protruding from the mold body
Since the printed wiring board 15 can be immersed and molded while gripping, the molding work is simplified.

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

Specifically, as shown in FIG. 5, the left and right end portions 20a and 20b of the printed wiring board 20 are connected to the molding die 2.
It is configured to inject and fill the resin into the cavities of the molding dies 24 and 25 while sandwiching and fixing the resin between them. As a result, the left and right end portions 20a of the printed wiring board 20 are removed from the left and right end surface portions of the molded body.
And 20b are configured to project. Further, fitting grooves having the same shape as the fitting groove 18 of the first embodiment are provided on different side surface portions of the mold body. still,
The configuration other than the above is the same as the configuration of the first embodiment.

Therefore, also in the second embodiment, it is possible to obtain substantially the same operational effects as in the first embodiment.
In particular, in the second embodiment, the printed wiring board 20 of the signal generator 19 is formed of a ferrite substrate, 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 the magnetic antenna 8 of the first embodiment or the conventional configuration (see FIG. 7). Can be made larger than the cross-sectional area of the ferrite core 8a. Therefore, the magnetic antenna 23
The sensitivity can be significantly improved as compared with the sensitivity of the magnetic antenna 8. Since the printed wiring board 20 is also used as the ferrite core of the magnetic antenna 23, the number of parts can be reduced and the signal generator 19 can be further downsized.

[0023]

As is apparent from the above description, the present invention provides a molded body formed by primary molding the signal generator with a fitting portion for positioning, and at the base end portion of the key plate, the above-mentioned molded portion. Since it is configured to provide a fitted portion that fits with the fitting portion of the body and positions the mold body,
The signal generator can be positioned simply by fitting the mating part of the key plate to the mating part of the key plate, eliminating the need for a conventional positioning holder during secondary molding. Therefore, the excellent effect that the number of parts and the number of assembling steps can be reduced is achieved.

Further, in the case of the above construction, the fitting portion of the mold body is constituted by the fitting groove, and the fitted portion of the base end portion of the key plate is fitted by the fitting projection portion for fitting in the fitting groove. When configured, the positioning configuration can be specifically realized with a simple configuration. Furthermore, when the signal generator is first molded, if one end of the printed wiring board is configured to project from the mold body, it is possible to position the projected one end by sandwiching it with a molding die. Positioning pins and the like can be eliminated, the structure of the molding die can be simplified, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a key plate and a signal generator showing 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 showing a second embodiment of the present invention.

FIG. 5 is a vertical sectional side view of the signal generator and the 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 portion, 1
2b is a base portion, 12c and 12d are protruding piece portions (fitted portions), 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 surfaces, 16c, 16d and 16e are convex portions, 17 is a fitting portion, 1
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 indicates a molding die.

Claims (3)

[Claims] 1. A key device for generating a signal including specific information, the signal generator being primary molded with resin, and being secondary molded with resin at a base end portion of a key plate. In the above, while providing a positioning fitting portion on a molded body formed by primary molding the signal generator, the base body of the key plate is fitted with the fitting portion of the molded body to form the molded body. A key device characterized in that a fitted part for positioning is provided. 2. The fitting portion of the mold body is formed of a fitting groove, and the fitted portion of the base end portion of the key plate is formed of a fitting projection portion that fits in the fitting groove. 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 configured to protrude from the molded body when the signal generator is first molded.