JP2736661B2 - Wireless transmission equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wireless transmission device using a plate antenna.

[Prior Art] In recent years, in a non-contact ID card system or the like, a plate antenna has been used to reduce the size and thickness of a wireless transmitter and a receiver. For example,
FIG. 5 shows a conventional non-contact ID card system that opens and closes a door by wirelessly transmitting and receiving identification data. The system includes an ID card 102, a receiver 100, and a signal processing unit 103. And a door gate 104 and the like. The receiver 100 includes an antenna 101, a receiving circuit 105, a power supply unit, and the like. The antenna 101 is shown in FIGS. 6 (a) and (b) and FIGS. A rectangular patch antenna whose structure and characteristics are shown is used.

In this antenna 200, as shown in FIGS. 6A and 6B, a radiation conductor 202 smaller than the ground conductor 201 is laminated and disposed above the ground conductor 201 via a dielectric 203. A feed line 205 is connected to a feed point 204 of the radiation conductor 202, and a connector 206 is provided on the back surface of the ground conductor 201.

To explain the operation of this system, as shown in FIG. 8, the normal door gate (door) 104 is in a closed state,
To open the door gate 104, stand near the door gate 104 and press the push switch of the ID card 102, and the ID card 102 transmits identification data. The data is received by the receiver 100 installed near the door gate 104, the data content is read by the signal processing unit 103, and the door gate 104 is unlocked. In the figure, the arrow indicates the moving direction of the door gate 104.

By the way, in such a conventional method, only the check at the time of entering the room is performed, so the directivity of the receiving antenna is
A unidirectional radiation pattern facing the outside of the room was sufficient.

However, when checking the exit using this system, the reception cannot be sufficiently performed due to the problem of the directivity of the antenna, and the limitation is obvious.

In view of such circumstances, the present applicant has proposed in Japanese Patent Application No. 63-73684 an antenna structure in which the directional characteristics of the antenna are made closer to non-directional, but the present invention discloses such an antenna structure. The present invention proposes a wireless transmission device that does not vary in resonance frequency or the like due to external factors during use when the device is incorporated.

[Problem to be Solved by the Invention] Therefore, the problem to be solved by the present invention is disclosed in Japanese Patent Application No. 63-73684.
In the case where the antenna structure proposed in No. 1 is applied to an actual wireless transmitting and receiving device, an intermediate user does not touch the antenna unit at the time of installation, etc.
In addition, it is an object of the present invention to provide a wireless transmission device capable of radiating a stable transmission frequency with little variation in resonance frequency even when an antenna is built in a main body case or the like.

[Means for Solving the Problems] A wireless transmission device according to the present invention proposed to achieve the above object is a wireless transmission device having a structure in which a wireless transmission processing unit is housed in a base case and covered with a lid cover. The wireless transmission unit is a circuit in which a high-frequency circuit unit having a power supply pin is mounted above a ground conductor plate provided with a cut-and-raised piece for a spacer at an edge of each opening formed in parallel. A substrate is mounted, and an opening window is formed at the center above the circuit board, and a frame-shaped radiating conductor plate having a short-circuiting plate is provided to form a three-layer antenna portion. The conductor plate is connected to the ground conductor plate through the circuit board by the short-circuit plate, is connected to the high-frequency circuit section of the circuit board by the power supply pin, and is connected to the ground of the circuit board. The ground pattern is connected to the ground conductor plate, and the high-frequency circuit portion is fixed at a position separated from the periphery of the opening window of the radiation conductor plate, and the base case is fixed to each inner surface. The wireless transmission processing section has a radiation conductor plate covered with a protective cover plate from above, and has a plurality of standing ribs formed with a plurality of vertical ribs formed at predetermined intervals. Both ends are placed in the steps formed on the plurality of standing ribs, are accommodated in the base case, and are covered with a lid cover.

Further, such a wireless transmission device of the present invention can be used as a wireless receiver if the high-frequency circuit unit mounted on the circuit board is used as a high-frequency reception circuit unit, and the high-frequency circuit unit mounted on the circuit board can be used. A high-frequency transmission circuit can be used as a wireless transmitter.

[Operation] The wireless transmission device of the present invention has the following operation.

The wireless transmission processing unit incorporating the antenna unit has a structure in which the width of the grounding conductor plate is equal to the width of the radiation conductor plate and the length of the grounding conductor plate is longer than that of the radiation conductor plate. Therefore, the vertical knitting wave component complements the horizontal knitting wave component, and an antenna directivity close to non-directionality can be obtained as compared with the conventional rectangular patch antenna.

In addition, the radiation conductor plate of the wireless transmission processing unit is locked by a step of a vertical rib provided at a predetermined interval on a pair of side walls of the base case of the main body case, the contact area with the case side is small, and the ground conductor plate is small. Can be kept constant, so that the stability of the frequency radiated from the antenna unit is good.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a wireless transmission device of the present invention,
FIG. 2 shows an assembled state of the main body case.

Referring to these drawings, the wireless transmission processing unit A is configured by combining a ground conductor plate 1, a radiation conductor plate 2, a high-frequency circuit unit, and a circuit board 3 on which other circuit units are mounted. The protective cover plate (see FIG. 3) which is a requirement of the present invention is omitted in these drawings.

1 is a grounded conductor plate formed in a rectangular shape. At four corners, stop portions 1a... For screwing to a screw portion 5a of a main body case of the receiver are formed, and a conductive portion 13 is formed at the center. Two openings 11, 11 are formed with a certain interval left, and cut-and-raised pieces 11a, 11a are provided at corresponding one ends of the openings 11, 11, respectively. The cut-and-raised pieces 11a, 11a serve as spacers when the circuit board 3 described later is placed,
This prevents the solder portion formed on the back surface of the circuit board 3 from inadvertently coming into contact with the ground conductor plate 1 due to the lifting by the spacer.

In the present invention, since the conductive portion 13 is left in the center of the ground conductor plate 1 having the highest current density of the antenna, there is no problem in lowering the antenna efficiency.

The cut-and-raised pieces 11a, 11a are provided with positioning claws 11b and connecting small pieces 11c.
The circuit board 3 is fixed to an appropriate position on the ground conductor plate 1 by fitting into a hole (not shown) provided on the side, and the other connection piece 11c
Is a soldering margin for applying and connecting solder to make the ground pattern provided on the back surface of the circuit board 3 the same ground level as the ground conductor plate 1.

A cut-and-raised piece 12 is also formed at the rear end of the ground conductor plate 1, and the same connection small piece 12a,
・ Is formed.

Further, locking notches 1b are provided on both sides of the ground conductor plate 1 to prevent accidental contact when the ground conductor plate 1 is incorporated in the main body case (see FIG. 4).

FIG. 4 is a view of the grounding conductor plate 1 as viewed from the back, and the circuit board 3 has two openings 11 and 11 of the grounding conductor plate 1.
., 12a... Provided on the grounding conductor plate 1 side are electrically conductive lands 3a formed on the ground pattern formed on the back surface of the circuit board 3.
... are connected by solder.

Reference numeral 2 denotes a radiation conductor plate disposed above the ground conductor plate. A large rectangular opening window 20 is formed at the center, and a short-circuit plate 4 for connecting the radiation conductor plate 2 to the ground conductor plate 1 is provided. Each of the corners has a stopper piece 2a, which extends to one end and is screwed to the screw support 5b of the main body case.

A locking piece 4a is formed at the tip of the short-circuiting plate 4, and the locking piece 4a is fitted into a slit (not shown) provided at a corresponding location on the circuit board 3 so that the radiation conductor plate 2 The position of attachment to the circuit board 3 is defined.

The rectangular opening window 20 formed in the center of the radiation conductor plate 2
When the circuit board 3 is mounted and arranged on the ground conductor plate 1,
It is formed to prevent contact with the circuit unit mounted on the circuit board 3 and to separate the high-frequency circuit unit 31 from the radiation conductor plate 1 with a sufficient distance.

On the other hand, the circuit board 3 is provided with a power supply pin 32 protruding therefrom, and in addition to a metal shield case incorporating the high-frequency circuit unit 31, the power supply pin 32, an electronic component 33 constituting a signal processing unit, and a processed signal are externally provided. An output terminal 34 for outputting is provided, and various control devices to be controlled by the wireless system are connected to the output terminal 34.

The output terminal 34 is omitted when configured as a wireless transmitter.

The power supply pin 32 protruding from the upper surface of the circuit board 3 is inserted into a hole 2b formed in the center of the radiation conductor plate 1 on the side of the short-circuit plate 4, fixed by solder, and connected.

In the above description, the unit of the wireless receiver has been described as an example. However, if the high-frequency circuit unit mounted on the circuit board is the transmission circuit unit, it goes without saying that the unit can be used as a wireless transmitter.

FIG. 3 shows an example of assembling the wireless transmission processing unit A in advance and then assembling the wireless transmission processing unit A in a main body case to configure a wireless receiver.
In such a configuration, the incorporation work when configuring the wireless transmitter and the receiver is easy.

The main body of the wireless receiver is formed by combining a lid cover 6 with a base case 5, and a screw provided with a stop piece 1 a of the ground conductor plate 1 of the wireless transmission processing unit A in the base case 5. Fix it to the pillar 5a with screws, and furthermore, radiating conductor plate 1
The fixing piece 2a is fixed to a screw post 5b erected at a fixed height on the base case 5 with a screw, and a protective cover plate 7 is put on the screw post 5b. It is configured such that it is not touched by hand at the time of wiring work, and then the lid cover 6 is finally covered.

When such a protective cover plate 7 is used, an intermediate wiring shop does not carelessly touch the antenna section or the circuit section during the construction work, and the internal circuit is prevented from being damaged by static electricity. Can be prevented. The base case 5 shown in FIG. 4 has, on both sides thereof, side walls 51, 51 of a constant height formed with a plurality of upright ribs 52 formed with step portions 53 at predetermined intervals. , The both ends of the radiation conductor plate 1 are locked and mounted on the respective step portions 53 of the standing ribs 52, so that the contact area between the radiation conductor plate 1 and the base case 5 is minimized. To prevent the resonance frequency of the antenna unit from becoming unstable.

[Effects of the Invention] According to the wireless transmission apparatus of the present invention, the contact of the antenna unit of the wireless transmission processing unit using the plate antenna with the main body case is suppressed to a minimum, so that the hand of the intermediate user during the wiring work is reduced. Since the internal circuit cannot be touched by the touch panel, there is no possibility that the internal circuit is destroyed by static electricity, and a high-reliability wireless transmission device can be provided that stabilizes high-frequency frequencies radiated from the antenna unit.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a wireless transmission device of the present invention, FIG. 2 is a view showing a state of being assembled to a main body case, and FIG. 3 is a case where a wireless transmission processing unit is formed as a unit and housed in the main body case. FIG. 4 is a back view of a ground conductor plate to which a circuit board of an antenna unit is connected, FIG. 5 is a configuration diagram of a non-contact ID card system using a plate antenna, and FIG. 7A and 7B are explanatory diagrams of the structure of a conventional plate patch antenna, FIGS. 7A to 7C are explanatory diagrams of the directional characteristics thereof, and FIG. 8 is an ID card using the plate patch antenna. It is a figure explaining the example of use of a system. [Explanation of Symbols] A: Wireless transmission unit 1: Ground conductor plate 11: Opening 11a: Cut-and-raised piece for spacer 13: Conductive portion left at center 2: Radiating conductor plate 20: Opening window 3 Circuit board 31 High-frequency circuit 32 Power supply pin 4 Short-circuit plate 7 Protective cover plate

Claims (4)

(57) [Claims] 1. A wireless transmission device having a structure in which a wireless transmission processing unit is accommodated in a base case and covered with a lid cover, wherein the wireless transmission unit is provided at an edge of each opening formed in parallel. A circuit board on which a high-frequency circuit section having power supply pins is mounted is mounted above a ground conductor plate provided with cut-and-raised pieces for a spacer, and an opening window is formed in the center above the circuit board. And, a frame-shaped radiating conductor plate having a short-circuiting plate is provided to form an antenna portion having a three-layer structure, and the radiating conductor plate is connected to the grounding conductor plate through the circuit board by the short-circuiting plate, The power supply pin is connected to the high-frequency circuit section of the circuit board, and the ground pattern of the circuit board is connected to the ground conductor plate. The base case has a structure fixed to a position separated from the periphery of the opening window of the plate, and the base case has, on each inner surface thereof, both side walls formed with a plurality of standing ribs having step portions having a fixed height formed at predetermined intervals. The wireless transmission processing unit has a radiation conductor plate covered with a protective cover plate from above, and both ends thereof are placed on steps formed in the plurality of upright ribs. And a wireless transmission device housed in the base case and configured to cover the lid cover. 2. The wireless transmission device according to claim 1, wherein the ground conductor plate has a width substantially equal to that of the radiation conductor plate and a length longer than that of the radiation conductor plate. 3. The wireless transmission device according to claim 1, wherein the high-frequency circuit unit mounted on the circuit board constitutes a high-frequency receiving circuit unit for receiving and processing a radio signal captured by the antenna unit. 4. The wireless transmission device according to claim 1, wherein the high-frequency circuit section mounted on the circuit board constitutes a high-frequency transmission circuit section that emits a radio signal from the antenna section.