JP3056011B2 - Radio selective call receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective calling receiver, and more particularly to a radio selective calling receiver which requires replacement of parts in accordance with a change in frequency.

[0002]

2. Description of the Related Art A conventional radio selective calling receiver will be described with reference to the drawings.

FIG. 5 is a block diagram showing an example of a conventional radio selective calling receiver (hereinafter, referred to as a receiver).

In FIG. 5, a high-frequency signal received by an antenna 26 is amplified by a radio unit 27a and then demodulated by a detection waveform shaping unit 28. The control unit 29 compares its own calling number pre-written in the readable individual number storage unit 30 with the demodulated signal from the detection waveform shaping unit 28. The signal is amplified by the speaker driving circuit 32 and a ringing tone is output from the speaker 34, and the blinking signal is caused by the LED driving circuit 33 to blink the LED 35 after amplification.

The control unit 29 is constituted by a microprocessor and a ROM in which a control program is stored, or is constituted by a logic circuit formed by random logic. The battery 4 is a power supply for the receiver, and supplies power necessary for operation to the wireless unit 27a, the LED drive circuit 33, and the like. The booster circuit 31 boosts the voltage of the battery 4 and
An operating voltage is applied to the control unit 29 and the individual number storage unit 30.

The radio section 27a employs a single super-heterodyne system and comprises a high-frequency amplifier 36, a high-frequency filter 37, a frequency converter 11, a band-pass filter 38, an intermediate frequency amplifier 39, and an oscillator 6. In particular, the oscillation circuit 6 obtains a desired local oscillation frequency by using the crystal oscillator 5 which needs to be replaced according to the local oscillation frequency, and the local oscillation signal is transmitted to the frequency conversion circuit 11 through the small-capacity capacitor 23. Has been injected. The small-capacity capacitor 23 is used as a means for increasing the impedance of the oscillation circuit 6 with respect to the line frequency and for isolating the line signal and the local signal.

FIG. 6 is a schematic diagram of the structure of a card-type receiver, which is one conventional receiver constituted by the circuit of FIG.

In FIG. 6, a frequency conversion circuit 11, a small-capacity capacitor 23, a crystal oscillator 5, an oscillation circuit 6, and the like are fixed on a printed circuit board 2 by soldering. The printed circuit board 2 has a structure sandwiched between the rear panel 22 and the front panel 1a, and the rear panel 22 and the front panel 1a have screws 25-1, 25-2, 25-3, and 2, respectively.
5-4, 25-5, and 25-6. The battery 4 is housed in a dedicated battery case 18 and inserted into a receiver, and supplies a voltage via a battery terminal (+) 13 and a battery terminal (-) 12.

The rear panel 22 and the front panel 1a
Are fixed with screws 25-1 to 25-6, and when the crystal oscillator 5 is replaced with a change in frequency, the screws 25-1 to 25-6 are used.
After removing -1 to 25-6, the replacement work is performed.

[0010]

As described above, the conventional radio selective transmission / reception receiver uses a large number of screws for the case structure. Therefore, when the case for fixing the case is replaced with a screw and the frequency changing part is replaced, the conventional method is repeated. There is a problem that it takes a lot of man-hours to replace parts after removing all screws.

[0011]

A radio selective calling receiver according to the present invention has at least one oscillating circuit and a battery case on which a replacement battery is mounted. In a radio selective call receiver requiring replacement, a first case for mounting the component, a socket for connecting the component with a printed circuit board constituting a radio section of the radio selective call receiver, and A first accommodating portion for accommodating the first case , wherein the first case is provided with the first case.
The component is attached to the component when stored in the storage portion
Connected to the socket via an output terminal or a second housing for housing the component in the battery case, wherein the battery case is provided in a battery housing of the radio selective calling receiver. When housed, it is attached to the part
An output terminal connected to the socket, or a plurality of first components for supplying power to the component, the transmission circuit connected to the component, and the printed circuit board in the battery case.
And a second terminal connected to a wireless circuit on the printed circuit board, and when the battery case is accommodated in the battery accommodating portion, the second terminal becomes a terminal of the wireless circuit. The second terminal and the terminal of the wireless circuit are connected by electromagnetic coupling when connected or when the battery case is housed in the battery housing portion.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing the structure of a first embodiment of the present invention.

In FIG. 1, a card-type receiver 1 according to the first embodiment has the shape of a case 1c. The case 1c is composed of a rear panel 1b and a front panel 1 enclosing the rear panel 1b.
a, a printed circuit board 2 is mounted on the rear panel 1b, and a battery housing portion 10 for housing a battery case 18 in which the battery 4 is mounted, and two output terminals are mounted.
And a housing for housing the case 14 on which the crystal oscillator 5 is mounted, and a battery terminal (−) is provided on the printed circuit board 2.
12, a battery terminal (+) 13, a socket 16 for the crystal oscillator 5, and an oscillation circuit 6 are mounted.

Next, the assembly of the first embodiment will be described.

The crystal oscillator 5 which needs to be replaced according to the local oscillation frequency is housed in a special case 14 and then housed in a part of the case 1c of the card type receiver 1 of the first embodiment. 1
5 is formed on the printed circuit board 2 by the socket 16 and is attached to the oscillation circuit 6 and the crystal oscillator 5.
It is electrically connected via two output terminals . The case 14 is fixed to a part of the front panel 1a with screws 17. After the battery 4 is stored in the battery case 18, the case 1c
Battery terminal (+) 13,
The battery voltage is supplied to the card-type receiver 1 via the battery terminal (-) 12.

FIG. 2 is a schematic diagram showing the structure of the second embodiment of the present invention.

In FIG. 2, the card-type receiver 1A of the second embodiment is partially different from the card-type receiver 1 shown in FIG. The battery case 19 has two output terminals
It is configured to have a housing section 20 for mounting the vibrated crystal oscillator 5, and the other parts are the same as those of the first embodiment shown in FIG.

FIG. 3 is a schematic diagram showing the structure of a third embodiment of the present invention.

In FIG. 3, the card-type receiver 1B of the third embodiment differs from the card-type receiver 1 shown in FIG. 1 in that a printed circuit board 2B is mounted on a rear panel 1b.
And a battery accommodating portion 10B for accommodating the battery case 3;
A battery terminal (-) 12, a battery terminal (+) 13, a frequency conversion circuit 11, and an electrode 40 are mounted on the printed circuit board 2B. And a connection unit 3-2 for connecting to the printed circuit board 2B, and a local oscillator unit 24. The local oscillator unit 24 includes a crystal oscillator 5 having two output terminals attached thereto, and an oscillator circuit 6. , Power terminal 8, ground terminal 9, electrode 41
And the printed wiring board 7 on which is mounted.

Next, the assembly of the third embodiment will be described.

A local oscillation unit 24 composed of a crystal oscillator 5 and an oscillation circuit 6 that need to be replaced according to the local oscillation frequency
Are housed in the housing 21 provided in a part of the battery case 3 together with the power supply terminal 8, the ground terminal 9 fixed on the printed circuit board 7, and the electrode 41 connected to the output line of the oscillation circuit 6.

At this time, the power supply terminal 8 is connected to the positive terminal of the battery 4 and
Further, the ground terminal 9 comes into contact with a connection portion 3-2 formed by bending a part of the minus plate 3-1 of the battery case 3. Since the minus plate 3-1 contacts one pole of the battery 4, the connection portion 3-2 is also grounded. That is, the local oscillation unit 24 receives a voltage required for operation from the battery 4 via the power supply terminal 8 and the ground terminal 9.

The battery case 3 accommodating the local oscillator unit 24 and the battery 4 is inserted into a battery accommodating portion 10B provided in the card-type receiver 1B of the first embodiment. The voltage of the battery 4 is supplied to circuits other than the local oscillation unit 24 via the battery terminal (+) 13 and the battery terminal (-) 12. Further, by disposing the frequency conversion circuit 11 near the position where the local oscillation unit 24 is inserted, coupling or mutual induction of the distributed capacitance generated between the opposite electrodes of the electrode 40 and the electrode 41 connected to the input line of the frequency conversion circuit 11. Thereby, the local oscillation signal is injected into the frequency conversion circuit 11 in a non-contact manner.

FIG. 4 is a block diagram of the card-type receiver of the third embodiment shown in FIG.

3 and 4, in the card-type receiver 1B of the third embodiment, the crystal oscillator 5 and the oscillation circuit 6, which need to be replaced according to the local oscillation frequency, are configured as a local oscillation unit 24. 5 except that a local signal from the oscillation circuit 6 is injected into the frequency conversion circuit 11 in a non-contact manner by mutual induction between the electrode 41 and the electrode 40. The circuit configuration is completely the same, and the operation of the circuit corresponding to the symbol is the same.

[0027]

As described above, the present invention eliminates the need to remove screws when replacing a crystal oscillator by using a structure in which a crystal oscillator requiring a frequency change can be accommodated and removed in a special case. This has the effect that the number of work steps can be reduced.

A local oscillator unit having a crystal oscillator requiring a frequency change, an oscillation circuit, a power supply terminal, and a ground terminal formed on a printed circuit board is housed in a part of a battery case, thereby providing a local oscillator signal. Can be injected into the frequency conversion circuit in a non-contact manner, and by receiving the voltage directly from the battery through the power supply terminal and the ground terminal, the local oscillator unit can operate independently, adjust the oscillation frequency and adjust the oscillation circuit. There is an effect that replacement of parts can be facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the structure of a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a structure of a second embodiment of the present invention.

FIG. 3 is a schematic view showing a structure of a third embodiment of the present invention.

FIG. 4 is a block diagram of a third embodiment shown in FIG.

FIG. 5 is a block diagram illustrating an example of a conventional receiver.

FIG. 6 is a schematic diagram showing the structure of the receiver shown in FIG.

[Explanation of symbols]

 1, 1A, 1B Card type receiver 1a Front panel 1b Rear panel 1c Case 2 Printed circuit board 3 Battery case 3-1 Negative plate 3-2 Connection section 4 Battery 5 Crystal oscillator 6 Oscillation circuit 7 Printed circuit board 8 Power supply terminal 9 Ground terminal 10 Battery housing 11 Frequency conversion circuit 12 Battery terminal (-) 13 Battery terminal (+) 14 Case 15 Housing 16 Socket 17 Screw 18 Battery case 19 Battery case 20 Housing 21 Housing 22 Rear panel 23 Small capacity capacitor 24 Local oscillation unit 25 Screw 26 Antenna 27, 27a Radio unit 28 Detection waveform shaping unit 29 Control unit 30 Individual number storage unit 31 Boost circuit 32 Speaker drive circuit 33 LED drive circuit 34 Speaker 35 LED 36 High frequency amplifier circuit 37 High frequency filter 38 Band filter 39 Intermediate frequency amplifier circuit 40 Electrode 41 Voltage

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-264815 (JP, A) JP-A-4-196730 (JP, A) JP-A-2-130029 (JP, A) 28159 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38

Claims (4)

(57) [Claims] 1. A radio selective call receiver having at least one oscillation circuit and a battery case on which a replacement battery is mounted, and requiring replacement of components in accordance with the oscillation frequency of the oscillation circuit. A first case for mounting the first case, a socket for connecting the component to a printed circuit board constituting a radio unit of the radio selective calling receiver, and a first housing for housing the first case. Then, when the first case is housed in the first housing, the part becomes the part.
A radio selective call receiver connected to the socket via an attached output terminal . And a second accommodating portion for accommodating the component in the battery case, the battery case being attached to the component when the battery case is accommodated in a battery accommodating portion of the radio selective calling receiver.
2. The radio selective calling receiver according to claim 1, wherein an output terminal connected to said socket is connected to said socket. 3. The component in the battery case, the transmitting circuit connected to the component, a plurality of first terminals for supplying power to the printed circuit board, and a wireless circuit on the printed circuit board And a second terminal connected to the wireless communication circuit, wherein the second terminal is connected to a terminal of the wireless circuit when the battery case is housed in the battery housing portion. Radio selective call receiver. 4. The radio selection device according to claim 3, wherein when the battery case is housed in the battery housing portion, the second terminal and the terminal of the wireless circuit are connected by electromagnetic coupling. Call receiver.