JPH09102975A - Card-shaped radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin card radio receiver which has a connector to be inserted and connected to the card slot of information terminal equipment and is provided with the planar loop antenna for a 900MHz band. SOLUTION: A printed wiring board 4, to which a connector 21 is fitted and a receiver circuit is mounted, is housed in a bottomed frame 3. A lower plate 2, onto which metallic female screws 18 and 19 are fitted, is fixed from the downside and a through hole bottom surface land and the female screws 18 and 19 are fastened and conducted by screws 13 and 14 through a through hole provided on the printed wiring board 4. A variable capacitance reactance element 6 on the power feeding terminal side and a capacitance reactance element 8 for extending/contracting antenna resonant waves on the far terminal side are respectively connected between an upper plate 1 and the bottom plate 2 by fixing screws 11 and 12 through metal arms 5 and 7. The gain is improved by providing a metal spring 20 between the printed wiring board 3 and the bottom plate 2, and the upper plate 1 and the bottom plate 2 are made into planar antenna elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-type radio receiver, and more particularly to a card-type radio receiver that also serves as a receiver case as an antenna element.

[0002]

2. Description of the Related Art For example, a radio paging receiver in the 250 to 300 MHz band has been miniaturized and made into a card, and its antenna has a cross section of "U" in which an upper plate and a bottom plate of a receiver case are used as antenna elements. A looped loop antenna is in practical use.

FIG. 4 is an external perspective view (A) and an explanatory sectional view (B) of a conventional card type radio paging receiver. In the figure, 44 is a printed wiring board on which a receiver circuit is mounted, 41
Is a top plate of the case, 42 is a bottom plate of the case, and 43 is an insulating frame. The antenna of this receiver is the upper plate 4
1 and the bottom plate 42 are also used as antenna elements, and the corner portion A-
It is a loop antenna having a U-shaped cross section in which the vicinity of A ′ is a feeding point and the vicinity of corner C-C ′ is a short circuit point. In order to make the receiver like a thin card, the bottom plate 42 is provided in the surrounding insulating frame 4
The printed wiring board 44 fixed to 3 is attached and fixed to the bottom surface (ground plane) of the printed wiring board 44 with a conductive adhesive or the like.

[0004]

In recent years, along with the diversification of information equipment and the networking of information and communication, it is necessary to use a wireless call service to enable a portable information terminal such as a notebook computer to receive information by a wireless call service. An experiment has been attempted in which a calling receiver is used by inserting it into a card slot of an information terminal. A card-type wireless paging receiver is inserted in a personal computer, and the personal computer is started at the time of reception to input and display a received message.

In order to cope with such an application, the interface (I / I
It is necessary to provide the radio paging receiver with a connector to be connected to the F) connector. However, it is difficult to attach the connector to the printed wiring board of the radio call receiver with the conventional structure in which the bottom plate is attached to the back surface of the printed wiring board with an adhesive, and a gap is provided between the bottom plate and the printed wiring board. There must be.

Further, for example, in order to receive a data service through a 900 MHz band wireless line, an antenna structure capable of receiving a reception frequency band from the current 250 to 300 MHz band to a 900 MHz band or a quasi-microwave band is used. Need to change.

An object of the present invention is to have a connector for inserting and connecting to a card slot of an information terminal, and having a 900 MH
It is an object of the present invention to provide a thin card-shaped radio receiver including a loop antenna having a structure capable of receiving radio waves in the z band or quasi-microwave band.

[0008]

A card type radio receiver according to claim 1 of the present invention is a printed wiring board on which a radio receiver circuit is mounted, and the printed wiring board is housed in a printed wiring board, which is sufficient compared with the wavelength. An insulating frame having a short height, a rectangular metal upper plate that covers the receiver circuit and has a plurality of corners and sides fixed with screws from the upper side of the insulating frame, and the back surface of the printed wiring board. A rectangular metal bottom plate that is attached and fixed from below the insulating frame, and a connector that is connected to one end side in the longitudinal direction of the printed wiring board and is inserted and connected to an external information terminal. And a card configured to form a loop antenna by using the upper plate and the bottom plate as antenna elements, the vicinity of corners of opposite ends of the upper plate and the bottom plate being connected to a power supply terminal of the wireless receiver circuit. Type wireless receiver, The insulating frame is formed integrally with a bottom plate portion for accommodating the printed wiring board by inserting it from the top while forming an opening in the frame on the connector side. The one end is provided with a connector for inserting and connecting to a card slot of an external information terminal to input received data, and one end is fixed to the ground wiring conductor portion on the back surface, and the hole is provided in the bottom plate portion of the insulating frame. A metal spring is provided through which the other end is pressed into contact with the bottom plate, and the upper plate is provided on the power supply terminal side of the printed wiring board, which is arranged near a corner on the other end side in the longitudinal direction facing the connector. And a variable capacitance reactance element for antenna tuning is connected in parallel between the feeding terminal side of the upper plate and the bottom plate, and a predetermined distance is provided from the vicinity of the corners of the sides of the upper plate and the bottom plate. Department It is characterized in that is configured to connect the capacitive reactance element for shortening the antenna resonance wavelength to form a tabular loop antenna according to each antenna element the top plate and the bottom plate to.

Claim 2 of the present invention showing a more detailed structure.
The card-type wireless receiver described in 1 above covers a printed wiring board on which a wireless receiver circuit is mounted, an insulating frame having a height short enough to accommodate the printed wiring board and shorter than the wavelength, and the receiver circuit. A rectangular metal upper plate having a plurality of corners and sides fixed from above with an insulating frame, and a back side of the printed wiring board covering the back surface of the printed wiring board, and fixed from below the insulating frame. A rectangular metal bottom plate and a connector provided for inserting and connecting to an external information terminal, which is connected to one end side in the longitudinal direction of the printed wiring board, of the upper plate and the bottom plate facing each other. In a card-type radio receiver configured to form a loop antenna with the top plate and the bottom plate as antenna elements, the vicinity of a corner being connected to a power supply terminal of the radio receiver circuit, the insulating frame is provided on the connector side. Open the frame In addition, a bottom plate portion for fitting and accommodating the printed wiring board from above is provided and integrally formed, and the printed wiring board is inserted into a card slot of an external information terminal at one end side in the longitudinal direction. A connector for connecting and inputting received data, and a first through-hole plated hole provided in the vicinity of the corner portion on the other end side in the longitudinal direction facing the connector with the vicinity of the corner portion as the power feeding end side, The second through-hole plated hole provided at a predetermined distance from the first through-hole plated hole and a metal screw for fixing the corner portion of the upper plate on the power feeding end side to the insulating frame are engaged. A first metal arm having one end fastened and fixed and the other end connected to a conductor land of a power supply terminal, and a conductor land of the power supply terminal and a conductor land of the first through-hole plated hole. For antenna tuning A variable-capacitance reactance element and a relay conductor land close to the second through-hole plating hole are engaged with a metal screw for fixing the side portion of the upper plate to the insulating frame and fixed at one end and the other end is in the immediate vicinity. A second metal arm connected to the antenna, a capacitive reactance element for shortening the antenna resonance wavelength connected between the relay conductor land and the conductor land of the second through-hole plating hole, and ground wiring on the back surface. A metal spring, one end of which is fixed to the conductor portion, penetrates through a hole provided in the bottom plate portion of the insulating frame and has the other end pressed against the bottom plate, and the bottom plate is provided on the printed wiring board. A metal female screw having a thickness equal to the thickness of the bottom plate portion of the insulating frame is fixed to the insulating frame at positions corresponding to the first and second through-hole plated holes, respectively. The printed wiring board is fitted and accommodated from above, the bottom plate is attached and fixed from below, and the female screw penetrates a hole provided in the bottom plate portion of the insulating frame to provide the first and second through holes. By inserting metal screws into the first and second through-hole plating holes and affixing them tightly in contact with the back surface conductor land of the plating hole, the upper plate and the bottom plate become antenna elements, respectively. It is configured to form a flat loop antenna in which the variable capacitance reactance element for antenna tuning is connected to the feeding end side and the capacitive reactance element for shortening the antenna resonance wavelength is connected at a predetermined interval. It is characterized by.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the external appearance of a card type radio receiver of the present invention, FIG. 2 is an example of its disassembled and assembled structure, and FIG. 3 is a cross-sectional view and an explanatory view of an antenna portion which is a main part of the present invention. . In these figures, common parts are given the same reference numerals.

In FIG. 2, reference numerals 1 and 2 are a rectangular upper plate and a bottom plate made of a conductor such as a thin steel plate. Reference numeral 3 is a bottomed frame formed of an insulator such as resin, and 4 is a printed wiring board on which a receiver circuit and functional circuit components are mounted. Reference numeral 9 is a small battery for operating the receiver circuit. Numerals 10 to 12 are metal screws for fixing the upper plate 1 to the bottomed frame 3, and match with the positions of the female holes 15 to 17 provided at the corners and sides of the bottomed frame 3. The hole of the upper plate 1 provided as described above is loosely inserted, and the upper plate 1 is placed from above and fastened and fixed. The printed wiring board 4 on which electronic components are mounted has a shape that fits inside the bottomed frame 3, and the bottom plate 2 is attached in a state of being housed in the bottomed frame 3. The bottom plate 2 is from the lower side of the bottomed frame 3,
It is attached and fixed to the back surface of the bottomed frame 3 with an adhesive or a double-sided adhesive insulating sheet. Reference numerals 18 and 19 are female screws fixed to the bottom plate 2. Holes are provided in the bottom surface of the bottomed frame 3 at positions corresponding to the female screws 18 and 19. Reference numeral 23 is a hole provided in the bottom surface of the bottomed frame 3, and is a hole through which a metal spring 20 described later penetrates.

FIG. 3 is a sectional view showing the structure of the antenna portion of the present invention. In the figure, the metal arm 5 has a screw 11
Is a metal fitting for electrically connecting the upper plate 1 and the input terminal part of the antenna power feeding circuit of the printed wiring board 4 when tightened in the female screw hole 17 of the bottomed frame 3, and the screw 11 is provided at one end thereof. A through hole is provided, and the screw 11 is attached to the upper plate 1.
When the upper plate 1 and the metal arm 5 are pierced through the hole of
Is in conduction. The other end of the metal arm 5 is
The printed wiring board 4 is electrically connected to the conductor land a of the input terminal portion of the antenna feeding circuit by soldering or the like.

Reference numeral 6 is a variable capacitance reactance element, for example, a multilayer ceramic chip trimmer capacitor.
One end of the variable capacitance reactance element 6 is soldered to the conductor land a of the input terminal portion and connected to the other end of the metal arm 5. On the other hand, the holes into which the metallic screws 13 and 14 of the printed wiring board 4 are inserted are plated with through holes, and the screws 13 and 14 are provided through the through holes of the printed wiring board 4 to the metal plate provided on the bottom plate 2. When fixed to the female screws 18 and 19, the bottom land of the through hole and the female screw 18 and
19 and the contact conduction state. The other end of the variable capacitance reactance element 6 is soldered to the upper surface land of the through hole conductor of the hole into which the screw 13 is inserted.

Similarly, the metal arm 7 serves to electrically connect the upper plate 1 and the capacitive reactance element 8 of the printed wiring board 4 when the screw 12 is tightened in the female screw hole 16 of the bottomed frame 3. It is a metal fitting, and a hole through which the screw 12 penetrates is provided at one end thereof. The screw 12 penetrates the hole of the upper plate 1 and at the same time overlaps with the hole at one end of the metal arm 7 and is fastened to the frame 3 The plate 1 and the metal arm 7 are in a conductive state. The other end of the metal arm 7 is soldered to the same conductor pattern to which one end of the capacitive reactance element 8 is soldered at the upper surface land b of the through hole of the hole through which the screw 14 penetrates. The other end of the capacitive reactance element 8 is soldered to the upper surface land of the through hole of the hole through which the metal screw 14 penetrates. The capacitive reactance element 8 serves to shorten the antenna resonance wavelength.

Reference numeral 20 denotes a metal spring, one end of which is soldered to a ground (ground) pattern surface on the back surface of the printed wiring board 4, penetrates a hole 23 of the bottomed frame 3 and the other end is a bottom plate at a point c. It is designed to come into contact with 2 and conduct. This metal spring 20 connects the bottom plate 2 to the ground side of the power supply terminal and plays a role of an inductive reactance that reduces a decrease in antenna gain due to a distributed capacitance between the back surface of the printed wiring board 4 and the bottom plate 2. And its length is determined by experiment. Further, the mounting position is set so as to be in pressure contact with a point c which is slightly deviated from the central portion of the bottom plate 2 as shown in FIG. As the position of this point c, a point where the antenna characteristic is best is selected by an experiment.

FIG. 3B is an explanatory view of the antenna shape, and LA shows the shape of the flat loop antenna of the present invention. The corner of the upper plate 1 is connected to the hot side of the power supply terminal of the receiver circuit at a point where it is conducted by the metal arm 5, and the variable capacitance reactance 6 is connected between the a point and the bottom plate 2. Further, a capacitive reactance element 8 is provided between the bottom plate 2 and a point b which is electrically connected by the metal arm 7 with a predetermined distance from the point a.
And the bottom plate 2 is connected to the metal spring 20 at the center point c.
Is electrically connected to the ground conductor of the printed wiring board 4 and is connected to the ground side of the power supply terminal. As described above, when the antenna side is viewed from the power feeding terminal of the receiver circuit, the upper plate 1 and the bottom plate 2 are flat plate antenna elements, and the variable capacitance reactance 6 for tuning is provided on the power feeding end side at predetermined intervals. A flat loop antenna having the capacitive reactance element 8 for shortening the antenna resonance wavelength is formed.

Metal screws 13 provided on the printed wiring board 4
The positions and intervals of the through-hole plated holes penetrated by and 14 are determined as follows. First, the connector 21
The feeding end side is arranged near the end opposite to the above, and a through hole plated hole penetrating the metal screw 13 is provided near the fixing screw 11 of the upper plate 1 of the corner portion thereof. Next, the distance between the two through-hole plating holes is the distance between the screws 11 and 12 of the upper plate 1, the distance between the female screws 18 and 19 of the bottom plate 2, and the upper plate 1.
And the length of the cross-section loop, which is the sum of the distance between the bottom plate 2 and the bottom plate 2, is determined to be ½ or less of the wavelength of the reception frequency.

The top plate 1 and the bottom plate 2 are thin steel plates, for example, having a thickness of about 0.3 because they are used as a flat loop antenna element.
A stainless steel plate of mm is plated with silver or gold to reduce high frequency resistance.

930 to which the present invention having the above configuration is applied
In the MHz band thin receiver, a thin plate loop antenna with a thickness (h) of about 5 mm, a width (W) of about 45 mm, and a length (L) of about 60 mm has a sufficient loop area to be measured. It was possible to obtain the same value as the gain when the conventional plate-shaped loop antenna was used for the large thick box-shaped receiver.

[0020]

As described above in detail, by housing the printed wiring board 4 on which the receiver circuit is mounted in the bottomed frame 3, the connector 21 can be mounted, and the top plate 1 and the bottom plate 2 can be mounted. Since a capacitive reactance element 8 for shortening the antenna resonance wavelength is provided on the far end side of loop-connecting, and a thin flat plate-shaped loop antenna having a wide aperture area and having a gain improvement by the metal spring 20 is configured. The practical effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an embodiment of the present invention.

FIG. 2 is an example diagram of an exploded assembly structure according to the embodiment of the present invention.

3A and 3B are a sectional view and an antenna shape explanatory view of an antenna portion, which is a main part of the present invention.

FIG. 4 is a perspective view and a cross-sectional view of a conventional card-type wireless paging receiver.

[Explanation of symbols]

 1 Upper plate 2 Bottom plate 3 Bottomed frame 4 Printed wiring board 5,7 Metal arm 6 Variable capacitance reactance element 8 Capacitive reactance element 9 Battery 10, 11, 12, 13, 14 Metal screw 15, 16, 17 Female screw hole 18 , 19 Female screw 20 Metal spring 21 Connector 22 Connector pin 23 Hole 41 Upper plate 42 Lower plate 43 Frame 44 Printed wiring board

Claims (6)

[Claims] 1. A printed wiring board on which a wireless receiver circuit is mounted, an insulating frame having the printed wiring board accommodated therein and having a height sufficiently shorter than a wavelength, and an upper side of the insulating frame covering the receiver circuit. To a square metal upper plate having corners and sides fixed with screws, and a square metal plate that is attached and fixed from below the insulating frame to cover the back surface of the printed wiring board. A bottom plate and a connector provided for inserting and connecting to an external information terminal, which is connected to one end side in the longitudinal direction of the printed wiring board, and the vicinity of the corners of the opposite ends of the top plate and the bottom plate is the In a card type radio receiver connected to a power supply terminal of a radio receiver circuit and configured to form a loop antenna by using the upper plate and the bottom plate as antenna elements, the insulating frame has an opening at a frame on the connector side. Together with before The printed wiring board is integrally formed by being provided with a bottom plate portion for fitting and receiving from above, and the received data is inserted and connected to a card slot of an external information terminal at one end in the longitudinal direction of the printed wiring board. And a metal spring whose one end is fixed to the ground wiring conductor portion on the back surface and which penetrates a hole provided in the bottom plate portion of the insulating frame and has the other end pressed against the bottom plate. And connecting the upper plate to the power supply terminal side of the printed wiring board arranged near the corner on the other end side in the longitudinal direction facing the connector, and between the power supply terminal side of the upper plate and the bottom plate. A variable capacitance reactance element for antenna tuning is connected in parallel, and a capacitive reactance element for shortening the antenna resonance wavelength is connected to a portion at a predetermined distance from the vicinity of the corner portion of the side portion of the top plate and the bottom plate. A card-type radio receiver, which is configured to form a flat loop antenna having an upper plate and a lower plate as antenna elements. 2. A printed wiring board on which a radio receiver circuit is mounted, an insulating frame having a height short enough to accommodate the printed wiring board and shorter than a wavelength, and an upper side of the insulating frame covering the receiver circuit. To a square metal upper plate having corners and sides fixed with screws, and a square metal plate that is attached and fixed from below the insulating frame to cover the back surface of the printed wiring board. A bottom plate and a connector provided for inserting and connecting to an external information terminal, which is connected to one end side in the longitudinal direction of the printed wiring board, and the vicinity of the corners of the opposite ends of the top plate and the bottom plate is the In a card type radio receiver connected to a power supply terminal of a radio receiver circuit and configured to form a loop antenna by using the upper plate and the bottom plate as antenna elements, the insulating frame has an opening at a frame on the connector side. Together with before The printed wiring board is integrally formed by being provided with a bottom plate portion for fitting and accommodating the printed wiring board from above. One end in the longitudinal direction of the printed wiring board is inserted and connected to a card slot of an external information terminal to receive. A connector for inputting data, a first through-hole plating hole provided in the vicinity of the corner of the other end in the longitudinal direction facing the connector with the vicinity of the corner as the power supply end, and the first A second through-hole plated hole provided at a predetermined distance from the through-hole plated hole, and a metal screw for fixing a corner of the upper plate on the power feeding end side to the insulating frame are engaged and one end is tightened. A first metal arm that is fixed and has the other end connected to a conductor land of a power supply terminal, and an antenna tuning antenna connected between the conductor land of the power supply terminal and the conductor land of the first through-hole plating hole. Variable capacity reactor And Vinegar element,
The second side in which a side portion of the upper plate near the second through-hole plating hole is engaged with a metal screw for fixing to the insulating frame, and one end is clamped and fixed, and the other end is connected to a relay conductor land in the immediate vicinity. A metal arm, a capacitive reactance element for shortening the antenna resonance wavelength connected between the relay conductor land and the conductor land of the second through-hole plated hole, and one end fixed to the ground wiring conductor portion on the back surface. And a metal spring having the other end pressed into contact with the bottom plate through a hole provided in the bottom plate portion of the insulating frame, and the bottom plate having the first and the first springs provided on the printed wiring board. A female metal screw having a thickness equal to the thickness of the bottom plate portion of the insulating frame is fixed to the positions corresponding to the second through-hole plating holes, and the printed wiring board is fitted into the insulating frame from above. , The bottom plate is attached and fixed from below, and the female screw penetrates a hole provided in the bottom plate portion of the insulating frame and abuts on the back surface conductor land of the first and second through-hole plating holes. In this state, by inserting metal screws into the first and second through-hole plating holes and tightening and fixing, the upper plate and the bottom plate become antenna elements, respectively, and the antenna plate for antenna tuning is provided on the feeding end side. A card type radio receiver characterized in that it is configured to form a flat loop antenna to which a variable capacitance reactance element is connected and a capacitive reactance element for shortening the antenna resonance wavelength is connected at a predetermined interval. . 3. The metal spring according to claim 2, wherein one end is fixed to the bottom plate, the other end penetrates a hole provided in the bottom plate portion of the insulating frame, and the other end is the ground wiring conductor on the back surface of the printed wiring board. The card type wireless receiver according to claim 2, wherein the card type wireless receiver is pressed against the portion. 4. The position of the second through-hole plating hole according to claim 2 is twice the distance from the first through-hole plating hole along the longitudinal edge of the printed wiring board. 3. The card type radio receiver according to claim 2, wherein the length of the loop obtained by adding twice the distance between the top plate and the bottom plate is set to 1/2 or less of the wavelength of the reception frequency. . 5. The position of the power supply terminal according to claim 2 and the position of the first through-hole plating hole in the vicinity thereof are arranged near a metal screw for fixing the side portion of the upper plate to the insulating frame. 3. The card type wireless receiver according to claim 2, wherein the wireless receiver is a card type wireless receiver. 6. The card type wireless receiver according to claim 2, wherein the top plate and the bottom plate are plated with a metal having a high conductivity such as gold or silver.