JPH0715360A - Electronic device with radio receiver built-in burglarproof device - Google Patents

Abstract

PURPOSE:To allow an operation unit itself to receive a radio broadcast. CONSTITUTION:A main body 1 is provided with an operation unit 11 mounted removably. The operation unit 11 is provided with a tuner 63 receiving a radio wave from an antenna 69, a PLL built-in microcomputer 60 controlling the selection of a desired channel from a received radio wave of the tuner 63 and a battery 62 supplying power to the tuner 63 and the microcomputer 60 when the operation unit 11 is removed from the main body 1. Then an audio signal by the received radio wave from the tuner 63 is fed to a headphone 68 via an amplifier 65. Thus, the operation unit 11 itself acts like a headphone radio receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft electronic device having a removable operation unit.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional anti-theft electronic device.
As shown in FIG. 10, vehicle-mounted electronic devices are known. 4 to 7, the electronic device with the anti-theft device is configured to include a device body 1 made of an audio device and an operation unit 11 detachably attached to the body 1. A front plate 2 is fixed to the front surface of the main body 1.
A cassette insertion hole 3 is provided in the. An opening / closing lid 4 is rotatably supported in the cassette insertion hole 3. In the vicinity of the cassette insertion hole 3, operation buttons 5, 6, 7 for controlling the cassette deck are arranged, and operation buttons 9, 10 for adjusting the sound quality are arranged. Further, a knob 8 for turning on / off the power switch and controlling the volume is arranged adjacent to the operation button 9. Further, an eject button 19 is arranged below the knob 8. The operation unit 11 is detachably mounted in the recess 12 of the front plate 2.

On the other hand, the operation unit 11 has preset buttons 13, 14, 15 for storing and calling a desired broadcasting station of a radio receiver, an up / down button 16 for tuning, and a band switching button. 17, a display unit 18 for displaying the reception frequency and the like are provided. The operation unit 11 can be detached from the front plate 2 by operating the eject button 19. The preset buttons 13, 14 and 15 also function as operation buttons for controlling various operations of the cassette deck when the cassette deck is operating.

FIG. 8 shows the front plate 2 in a disassembled state. In FIG. 8, a support piece 20 is provided on the rear surface of the front plate 2.
Are fixed by screws, and the projecting piece 19a of the eject button 19 is inserted into the hole 20a formed in the supporting piece 20. The eject button 19 is projected to the front through a hole 24 formed in the front plate 2. The eject button 19 is biased forward by the spring 21. Further, a locking piece 22 is slidably held on the support piece 20, and the locking piece 22 has an eject button 1.
A long hole 22a through which the projecting piece 19a of 9 penetrates is formed.
Further, the locking piece 22 is integrally formed with an inclined surface 22b. The locking piece 22 is biased rightward by the spring 23. The front end of the locking piece 22 is the front plate 2
The hole 25 formed in the inner wall surface of the recess 12 protrudes into the recess 12. And the holes 2 formed in the front plate 2
Eject button 19 that penetrates 4 and is projected to the front
Is pressed against the urging force of the spring 21, the rear surface projection 19b of the eject button 19 causes the inclined surface 22 of the locking piece 22 to move.
b is pressed. For this reason, the locking piece 22 moves to the left against the biasing force of the spring 23, and the tip of the locking piece 22 moves into the hole 2.
Retreat within 5. A V-shaped leaf spring 26 is fixed to the bottom surface of the recess 12. Further, the front plate 2 is provided with a restricting piece 27 for restricting the protrusion of the operation unit 11, and the restricting piece 27 is inserted into and fixed to a hole 28 formed in the front plate 2 from the back side. A protrusion 27 a is integrally formed on the restriction piece 27.
The a can be locked in the concave groove 29 formed in the lower surface of the operation unit 11. Further, a plurality of contacts 3 are provided on the bottom surface of the recess 12.
0 is arranged, and each contact 30 is arranged so as to be able to contact a plurality of contacts 31 formed on the rear surface of the operation unit 11. An opening / closing lid 4 is rotatably supported on the front plate 2, and the opening / closing lid 4 opens and closes the cassette insertion hole 3. The opening / closing lid 4 is biased by a spring 32, and the biasing force of the spring 32 acts on the opening / closing lid 4 to close the cassette insertion hole 3. In addition, the support piece 22
A switch 33 is fixed to the switch 33.
Is a switch for detecting that the eject button 19 is pressed. A light emitting diode 34 is attached to the bottom surface of the recess 12 of the front plate 2.

FIG. 9 shows the operation unit 11 in a disassembled state. In FIG. 9, the operation unit 11 is provided with an upper case 35 and a lower case 36.
The operation unit 11 is configured by combining the lower case 36 and the lower case 36 and screwing them together. The preset buttons 13, 14, 15 and the up / down button 16 are rotatably held on the front side of the upper case 35. Furthermore, upper case 3
5, a window 37 is formed, and a transparent plate 38 is fixed to the outer peripheral portion of the window 37 via a double-sided tape 39. The band switching button 17 is provided near the window 37.
Are arranged. Further, a concave groove 40 is formed on the right side surface of the upper case 35, and the concave groove 40 can be engaged with a projecting piece 41 formed on the inner wall surface of the concave portion 12 of the front plate 2. Further, the light guides 42 and 43 are screwed to the back surface side of the upper case 35.

On the other hand, a printed circuit board 44 is arranged between the upper case 35 and the lower case 36, and a plurality of switches 45 driven by the buttons 13 to 17 are attached to the printed circuit board 44. The illumination lamp 46 and the display device 47 are fixed. Further, a ground plate 50 is fixed to the back side of the printed circuit board 44 via a ground plate 48 and an insulating sheet 49, and the ground plate 50 is fixed to the outer surface of the lower case 36. In this way, the switch 45 and the display device 47 are housed in the case including the upper case 35 and the lower case 36 to configure the operation unit 11. When the operation unit 11 is housed in the recess 12 of the front plate 2, the contact point 31 of the operation unit 11 and the contact point 3 of the front plate 2 are in contact with each other.
0 is in contact with the electric circuit in the operation unit 11 and the main body 1
The internal electric circuit is connected via the contacts 30 and 31.

FIG. 10 shows a bottom view of the operation unit 11. In FIG. 10, a concave groove 40 is formed on the right side surface of the operation unit 11, and a concave groove 50 is formed on the left side surface thereof.
A groove 29 is formed on the lower surface.

The operation unit 11 is shown in FIGS.
As shown in FIG. 3, it is normally stored in the recess 12 of the front plate 2. In this stored state, the concave groove 40 formed on the right side surface of the operation unit 11 engages with the protrusion 41 formed on the inner wall surface of the concave portion 12 of the front plate 2, and the operation unit 11
The tip of the locking piece 22 is locked in the groove 51 formed on the left side surface of the operation unit 11, the operation unit 11 is held in the recess 12 of the front plate 2, and the groove 2 formed on the lower surface of the operation unit 11
The protrusion 27a is fitted to the shaft 9. In such a holding state, the plurality of contacts 31 of the operation unit 11 are
The electric circuit on the main body 1 side is electrically connected to the switch 45 of the operation unit 11, the illumination lamp 46, and the display device 47 by making contact with the plurality of contacts 30 arranged in the recess 12 of the front plate 2. become. Therefore, by operating the preset buttons 13, 14, 15 and the up / down button 16 of the operation unit 11, the radio receiver and the cassette deck are controlled.

Here, when the user leaves the vehicle, as shown in FIG. 5, when the eject button 19 is pressed, the locking piece 22 is pushed by the eject button 19, and the tip of the locking piece 22 is a hole. 25, and the locking piece 22
The engagement with the concave groove 51 of the operation unit 11 is released.
Therefore, the operation unit 11 is pushed forward by the biasing force of the leaf spring 26. At this time, even if the engagement between the locking piece 22 and the concave groove 51 of the operation unit 11 is released, the concave groove 40 on the right side surface of the operation unit 11 and the concave portion 12 of the front plate 2 are released.
Since the inner projection 41 is in the locked state, the operation unit 11 urged by the leaf spring 26 is rotated so that the left side projects forward (see FIG. 6).

The rotation range of the operation unit 11 is determined by the engagement state of the concave groove 29 and the protrusion 27a on the lower surface of the operation unit 11. That is, as shown in FIG. 3, when the operation unit 11 is rotated and is held by hand and pulled forward, the engagement between the protrusion 27a and the concave groove 29 is released, and the operation unit 11 is released. The engagement between the concave groove 40 on the right side surface and the protrusion 41 of the front plate 2 is released, and the operation unit 11 is separated from the front plate 2. The operation unit 11 is the front plate 2
When separated from, the contact point 31 of the operation unit 11 and the contact point 30 of the front plate 2 are brought into a non-contact state. This non-contact state is detected by the detection circuit for the main body 1, and the radio reception circuit,
The power supply to the cassette deck control circuit is stopped.
In this way, when the user removes the operation unit 11 from the front plate 2 and takes it out of the vehicle, only the device having no operation unit remains in the vehicle, which prevents theft.

When the operation unit 11 is removed from the front plate 2, the light emitting diode 34 blinks at a predetermined cycle to indicate that the antitheft mode is set. Further, the light emitting diode 34 lights up when the user returns to the automobile and turns the engine key to the ON position of the accessory switch. Therefore, when returning to the automobile at night and storing the operation unit 11 in the recess 12 of the front plate 2 again, the recess 12 is illuminated by the light emitting diode 34, the position of the recess 12 is immediately known, and the operation unit 11 is stored again. Will be easier.

[0012]

However, in the above-mentioned conventional electronic equipment with antitheft device, in order to prevent theft,
After the operation unit 11 is removed from the main body 1, the operation unit 11 is simply carried around. That is,
The operation unit 11 cannot be used at all.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an electronic device with a built-in antitheft device with a built-in radio that allows the operation unit itself to listen to a radio broadcast.

[0014]

In order to achieve the above-mentioned object, the present invention provides an operation unit provided with at least operation means, and an electronic equipment main body having a holding mechanism for detachably holding the operation unit. The operation electronic device main body has a contact for electrically connecting the operation unit and the electronic device main body when the operation unit is attached to the holding mechanism, and the operation unit operates the holding mechanism. A contact for electrically connecting the operation unit and the main body of the electronic device when the unit is mounted, an antenna for receiving a radio wave, and a selection means for selecting a specific frequency in the received radio wave of the antenna, The detection means for detecting the frequency signal selected by the selection means, the amplification means for amplifying the detection output of the detection means and outputting the audio signal, and the audio signal amplified by the amplification means. And sound output means for converting the o signal to the audio, is obtained by an electronic apparatus with a radio built-in antitheft device and a power supply for supplying power to each unit of the operating unit.

[0015]

Therefore, according to the present invention, when the operation unit is removed from the main body, power is supplied from the power source to each means of the operation unit, and the specific frequency of the received radio waves received by the antenna is selected by the selection means. The selected and selected frequency signal is detected by the detection means, the detected output is amplified by the amplification means and output as an audio signal, and this audio signal is converted into voice. Therefore, the operation unit itself can listen to the radio broadcast.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block configuration diagram of an electronic device, and FIG. 2 is a perspective view of an operation unit. 1 and 2, the electronic device with a built-in anti-theft device with a radio includes an audio device main body 1 and an operation unit 11, and the operation unit 11 is detachably attached to the main body 1. Main body 1 is power supply 7
0, a microcomputer 71, and other various components related to audio equipment. When the operation unit 11 is mounted in the main body 1, the main body 1 and the operation unit 11 are installed.
And are connected to each other via contacts 30 and 31. The specific configuration of the main body 1 is shown in FIGS.
Since the same as the conventional one shown in FIG. 1, the same parts as those of the conventional one are denoted by the same reference numerals and the description thereof will be omitted.

On the other hand, the operation unit 11 includes a PLL built-in microcomputer 60, radio buttons 61, radio lithium rechargeable battery 62, tuner 63, low pass filter 64, amplifier 65, LCD driver 66, key matrix circuit 67, headphones 68, antenna. 69, transistors Q1 and Q2, diodes D1 and D2, and a capacitor C1. When the operation unit 11 is attached to the main body 1 of each part of the operation unit 11 such as the microcomputer 60, the power from the power source 70 is supplied through the diode D2. When the radio button 61 is turned on, the radio receivable mode is set when the radio button 61 is turned on.
Power is supplied to each part from. The radio button 61 can be operated only when the operation unit 11 is detached from the main body 1, and power is supplied from the battery 62 to each part on condition that the radio button 61 is turned on, thus wasting power. It is designed to prevent That is, the microcomputer 60 makes the radio button 61 operable after determining that the operation unit 11 has been removed from the main body 1, and sets the radio reception mode when the radio button 61 is pressed. .

When the power from the battery 62 is supplied to each unit, the tuner 63 receives a radio wave through the antenna 69 and outputs a signal of the local oscillation frequency from the oscillator (OSC) to the PLL built-in microcomputer 60, The direct current component from which the noise component has been removed is input from the low-pass filter 64 to the varactor, and an audio signal is output to the amplifier 65. That is, the tuner 63, the low-pass filter 64, the PLL built-in microcomputer 6
0 constitutes the selecting means and the detecting means.

When the audio signal is output from the tuner 63 to the amplifier 65, this audio signal is output to the amplifier 65.
Is amplified by and output to the headphones 68. Then, a sound corresponding to the received radio wave is output from the headphones 68. That is, the amplifier 65 constitutes an amplifying means, and the headphones 6
Reference numeral 8 constitutes a voice output means. In addition,
The antenna 69 is adapted to be output from the inside of the operation unit 11 to the outside by operating the antenna switch 60.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, when the operation unit 11 is removed from the main body 1 (step S1), the PLL built-in microcomputer 60 determines that the operation unit 11 is removed from the main body 1 and enables the radio button 61. When the radio button 61 is turned on, the PLL built-in microcomputer 60 is turned on, the power from the lithium rechargeable battery 62 for radio is supplied to the microcomputer 60 and the tuner 63, and the radio receivable mode is set (steps S2 and S3). , S4). At this time, when the antenna switch 80 is pressed, the antenna 69 is brought out of the operation unit 11 (step S5). If you tune and receive the radio at this time (step S
6), the radio wave received by the antenna 69 is input to the tuner 63. At this time, a local oscillation frequency for converting the frequency of the radio wave into the intermediate frequency of the output is transmitted by the oscillator, input to the microcomputer 60, and the phase is compared with the frequency set in the microcomputer 60. Information corresponding to the comparison result is transferred to the low-pass filter 64, the noise component is removed, and then the DC component is input to the varactor of the tuner 63, and the above processing is performed until the phases become equal.

After the phases are equalized, the tuner 63 outputs an audio signal to the amplifier 65, the amplifier 65 amplifies the audio signal, and then the headphone 68. Then, the received electric wave is reproduced as sound by the headphones 68, and the sound can be heard.

If you want to listen to the radio broadcast,
When the headphones 68 are attached to the operation unit 11, the radio can be heard (steps S7, S8, S9). On the other hand, when not listening to the radio, the radio button 60 is turned off and carried, or the operation unit 11 is attached to the main body 1 (steps S10, S11, S12, S13, S1).
4).

As described above, according to the above embodiment, the operation unit 11 is not only removable for theft prevention but also
You can listen to radio broadcasts as headphone radio.

[0024]

As is apparent from the above embodiment, the present invention has the radio built in the operation unit, so that the operation unit itself can listen to the radio broadcast.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an electronic device with a built-in radio type antitheft device showing an embodiment of the present invention.

FIG. 2 is a perspective view of an operation unit

3 is a flowchart for explaining the operation of the apparatus shown in FIG.

FIG. 4 is a front view of a conventional example.

FIG. 5 is a perspective view of a conventional example.

FIG. 6 is a diagram for explaining a method of disassembling a conventional operation unit.

FIG. 7 is a diagram for explaining a method of disassembling a conventional operation unit.

FIG. 8 is an exploded perspective view of a front plate of a conventional example.

FIG. 9 is an exploded perspective view of a conventional operation unit.

FIG. 10 is a bottom view of a conventional operation unit.

[Explanation of symbols]

 1 main body 11 operation unit 60 microcomputer with built-in PLL 61 radio button 62 radio rechargeable battery 63 tuner 64 low pass filter 65 amplifier 68 headphones 69 antenna 70 power supply 71 microcomputer 80 antenna switch

Claims (1)

[Claims] 1. An operating unit provided with at least an operating means, and an electronic device body having a holding mechanism for detachably holding the operating unit, wherein the operating electronic device body is operated by the holding mechanism. A contact is provided for electrically connecting the operation unit and the electronic device body when the unit is attached, and the operation unit connects the operation unit and the electronic device body when the operation unit is attached to the holding mechanism. A contact for electrical connection, an antenna for receiving radio waves, a selection means for selecting a specific frequency in the reception radio wave of the antenna, a detection means for detecting a frequency signal by the selection of the selection means, and a detection means. Amplification means for amplifying the detection output of the means to output an audio signal, voice output means for converting the audio signal amplified by the amplification means into voice, and an operation unit. An electronic device with an anti-theft device with a built-in radio, which is equipped with a power supply that supplies power to each means of the radio.