JPS6226871Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette-type recording and reproducing apparatus configured so that it can be used as a radio receiver by installing a cassette incorporating a radio receiving circuit.

For example, a portable cassette tape recorder is known which is configured so that it can be selectively used as a radio receiver. In other words, although the main body of the tape recorder is not equipped with a receiving circuit, a cassette with a built-in radio receiving circuit (hereinafter referred to as a ``tuner cassette'') is installed in the cassette mounting position instead of a normal tape cassette. The signal received by the tuner cassette is then amplified by an amplifier on the tape recorder's main body and reproduced from a speaker or headphones.

However, conventional tape recorders of this type have had the following problems. In other words, operations such as selecting a channel must be performed using buttons or dials provided on the tuner cassette, but there is usually a hole in the cassette mounting position of a tape recorder to protect the internal structure of the magnetic head, etc. An opening/closing lid is provided to prevent the installed cassette from accidentally falling off. Therefore, in order to operate the buttons and dials on the tuner cassette, you must open and close the lid each time.
For this reason, the channel selection operation was extremely troublesome.

The present invention was developed in view of these problems, and by providing a channel selection button on the opening/closing lid where the cassette is installed, it is possible to perform the tuning operation even when the opening/closing lid is closed. The present invention is intended to provide a cassette type recording/reproducing apparatus constructed as described above.

Note that the "tuning buttons" referred to in the present invention include all buttons used for tuning operations, such as band switching buttons, preset buttons for presetting frequencies, and memory buttons.

Hereinafter, an embodiment in which the present invention is applied to a portable cassette type tape recorder will be described with reference to the drawings.

As shown in FIGS. 1 and 4, a tape recorder body 1 is provided with a cassette compartment 2 at a predetermined position for mounting a cassette. The cassette compartment 2 is formed as a recess in the main body of the tape recorder, and an opening/closing lid 3 is provided to close this recess. Although not shown in the drawings, a predetermined cassette mounting mechanism consisting of a reel shaft and the like is provided within the cassette compartment 2.

The tape recorder of this embodiment is constructed so that it can be used as a radio receiver by installing a tuner cassette 4 as shown in FIG. The cassette housing of the tuner cassette 4 has almost the same shape as a normal tape cassette, and has four shaft insertion holes 5 and 4 for inserting the supply reel shaft and take-up reel shaft on the tape recorder main body 1 side, respectively. Positioning hole 6 for inserting the positioning pin of
Each is equipped with the following. With this configuration, the tuner cassette 4 can be inserted into the cassette compartment 2 just like a normal tape cassette.
It can be installed inside.

The tuner cassette 4 incorporates a predetermined radio receiving circuit instead of a magnetic tape or the like. The illustrated example is for an FM-only device, but an AM-only device, an AM/FM switching receiver, etc. can also be configured in substantially the same way as this example.

The upper surface of the tuner cassette 4 is provided with two channel selection buttons 7, 8, five preset channel selection buttons 9, and a memory button 10, respectively. As shown in FIG. 4, each of these buttons 7-10 is configured as a so-called push button, and each button 7-10 is biased upward by a coil spring 23. By pressing these buttons 7 to 10, the bottom surface of each button 7 to 10 comes into contact with the terminals 21 and 22 provided on the printed circuit board 39, and these terminals 2
1 and 22 are short-circuited.

Display window 1 is located in the center of the upper surface of tuner cassette 4.
9 is provided to display the frequency of the receiving station using a liquid crystal, a light emitting diode, or the like. As shown in FIGS. 4 and 5, five connection terminals 11 are provided on the back side of the tuner cassette 4, while connection terminals corresponding to these connection terminals 11 are provided in the cassette compartment 2. 12 are provided. When the tuner cassette 4 is installed in the cassette compartment 2, these connecting terminals 11 and 12 come into contact with each other, thereby causing the radio receiving circuit in the tuner cassette 4 to connect to the circuit on the tape recorder body 1 side. It is now electrically connected to.

As shown in FIGS. 1, 3, and 4, the cassette compartment 2 is provided with an opening/closing lid 3. As shown in FIGS. The opening/closing lid 3 has a substantially L-shaped cross section, and is rotatably attached to the tape recorder main body 1 via a rotation shaft 13 provided at one end thereof. Although not shown, this opening/closing lid 3 is biased counterclockwise in FIG. 4 by a coil spring or the like, that is, in the open state of the opening/closing lid 3. The first
It is maintained in the closed state shown in FIGS.
Therefore, in order to open the opening/closing lid 3, it is sufficient to operate a predetermined disengagement button provided on the tape recorder main body 1, whereby the engagement of the engaging means is released and the opening/closing lid 3 is opened. Automatically open. To close the opening/closing lid 3, the opening/closing lid 3 is pushed into the tape recorder main body 1, and the opening/closing lid 3 is held in the closed state shown in FIGS. 1 and 4 by the above-mentioned engaging means.

The opening/closing lid 3 is provided with channel selection buttons 14, 15 and a preset button 16 corresponding to the channel selection buttons 7, 8 and preset button 9 of the tuner cassette 4, respectively. As shown in FIG. 4, each of these buttons 14 to 16
has a substantially I-shaped cross section, and is attached to fit into a through hole 17 provided in the opening/closing lid 3. Each of the buttons 14 to 16 is urged upward in FIG. 4 by a coil spring 18 provided between the buttons 14 and 16. These selection buttons 1
4, 15 and the preset button 16, when the tuner cassette 4 is installed in the cassette compartment 2 and the opening/closing lid 3 is closed,
They are arranged directly above the channel selection buttons 7, 8 and preset button 9 of the tuner cassette 4, respectively. Therefore, by pressing the channel selection buttons 14 and 15 and the preset button 16 with the opening/closing lid 3 closed, the channel selection buttons 7 and 8 and the preset button of the tuner cassette 4 installed in the cassette compartment 2 are pressed. The buttons 9 are operated by being directly pressed against the buttons 14 to 16 of the opening/closing lid 3, respectively.

In addition, the opening/closing lid 3 has a see-through window 2 in the center of its upper surface.
0 is set. This see-through window 20 is for directly viewing the amount of tape used when a normal tape cassette is installed.As shown in FIG. 1, when a tuner cassette 4 is installed, Displays such as frequencies displayed on the display window 19 can be viewed through the see-through window 20.

Next, an example of the configuration of the radio receiving circuit built into the tuner cassette 4 will be explained with reference to FIG.

The tape recorder 1 of this embodiment is a reproduction-only machine, and the reproduced sound is listened to through a headphone 24. Therefore, in this example, the connection cord 25 of the headphone 24 is used as an antenna. That is, the signal received by the connection cord 25 of the headphone 24 is transmitted to the tape recorder main body 1.
For example, R of the headphone jack 26 provided in
Connecting terminal 1 from terminal 27 via capacitor 28
2a, and further from this connection terminal 12a,
The signal is supplied to the tuning circuit 29 in the cassette 4 via the connection terminal 11a on the tuner cassette 4 side. The capacitor 28 is for blocking low frequency signals such as audio signals from the power amplifier 36.

The tuning circuit 29 is composed of a high frequency amplifier and a mixer, as is well known in the art, and includes a PLL (Phase
VCO output signal a supplied from the local oscillator (voltage controlled oscillator VCO) of the Locked Loop) circuit 30
An intermediate frequency signal b corresponding to the intermediate frequency signal b is supplied to an intermediate frequency amplifier (IF) 31. The signal amplified by the intermediate frequency amplifier 31 is converted into an audio signal by the FM detector 32, and then sent to the stereo demodulator (MPX).
33, it is demodulated into a right side signal (R signal) c and a left side signal (L signal) d. These R signals and L signals are amplified by low-frequency back amplifiers 34 and 35, respectively, and then amplified by connection terminals 11b, 11c and 12b, 12.
The signal is supplied to the power amplifiers 36 and 37 of the tape recorder main body 1 through the power amplifiers 36 and 37, respectively, and is supplied from these power amplifiers 36 and 37 to the R terminal 27 and the L terminal 38 of the headphone jack 26, respectively.

In the PLL circuit 30, as is conventionally known, the oscillation frequency of the local oscillator is divided by a frequency divider, the phase of this is compared with a reference signal from a reference signal generator, and the oscillation frequency of the local oscillator is determined based on the error voltage. That is, it is configured to control the frequency of the VCO output signal described above. The operation of this PLL circuit 30 is controlled by the channel selection buttons 7, 8, etc.

The earth line of the radio receiving circuit is connected to connection terminal 1.
It is connected to the ground line of the tape recorder main body 1 via 1d and 12d. Further, from the tape recorder main body 1, low frequency amplifiers 34, 35 and FM detector 3 are connected via connection terminals 12e and 11e.
2. Intermediate frequency amplifier 31, tuning circuit 29 and PLL
A predetermined power supply voltage is supplied to the circuit 30.

Next, the channel selection operation of this radio receiving circuit will be explained.

When you momentarily press the selection button 7 or 8,
The frequency division ratio of the frequency divider in the PLL circuit 30 changes continuously. Therefore, at this time, the oscillation frequency of the local oscillator changes continuously, and the frequency of the intermediate frequency signal from the tuning circuit 29 also changes. The level of this intermediate frequency signal increases rapidly when it is tuned to the frequency of the broadcasting station, so this level change is detected and the division ratio of the frequency divider is fixed at the value at that time. This locks the oscillation frequency of the local oscillator. That is, when the channel selection button 7 or 8 is pressed momentarily, the oscillation frequency of the local oscillator becomes successively smaller or larger, and is locked when tuned to the frequency of the broadcasting station. The frequency at this time is displayed on the display window 19 of the tuner cassette 4. By repeating this operation, a desired broadcasting station can be selected. Furthermore, if the channel selection button 7 or 8 is held down, the oscillation frequency of the local oscillator will continue to change without being locked, thereby making it possible to skip unnecessary broadcast stations.

When the desired broadcast station is selected, memory button 10
If you press , and press preset button 9 at the same time, the division ratio at that time, that is, the frequency of the broadcasting station, will be stored in memory. Therefore, from now on, the same broadcast station can be selected simply by pressing the same preset button 9.

In this embodiment, the channel selection buttons 14 and 15 and the preset button 16 corresponding to the channel selection buttons 7 and 8 and the preset button 9 of the tuner cassette 4 are connected to the opening/closing lid 3.
The above-mentioned channel selection operation can be performed even when the opening/closing lid 3 is closed.
Therefore, unlike in the past, the lid 3 has to be opened and closed every time the channel selection operation is performed.
There's no need to open it. In this example, if the opening/closing lid 3 is further provided with a button corresponding to the memory button 10 of the tuner cassette 4, the above-mentioned memory operation can be performed with the opening/closing lid 3 closed.
Further, when an AM/FM switching receiver is used as the tuner cassette 4, a button corresponding to the AM/FM switching button can be provided on the opening/closing lid 3.

Although the present invention has been described above with reference to one embodiment, the above embodiment does not limit the present invention in any way, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the present invention is applied to a playback-only tape recorder, but of course the present invention can also be applied to a tape recorder capable of recording and playback. Furthermore, the present invention can also be applied to a cassette type disk recorder.

Further, in the above embodiment, the channel selection buttons 14 to 16 of the opening/closing lid 3 and the tuner cassette 4 are mechanically associated, so that these channel selection buttons 14 to 16 directly control the selection of the tuner cassette 4. The station buttons 7 to 9 are pressed respectively. However, in the present invention, the channel selection buttons 14 to 16 and the tuner cassette 4 may be electrically associated with each other. For example, each terminal 21, 22 of the tuning switch of the tuner cassette 4 is connected to the tuner cassette 4.
The buttons 14 to 16 for selecting channels are formed on the top surface of the opening/closing lid 3.
By directly contacting these terminals 21 and 22, it is possible to short-circuit between these terminals 21 and 22. In addition, a push button switch for channel selection equipped with a contact terminal is provided on the opening/closing lid 3,
This push button switch and the radio receiving circuit of the tuner cassette 4 may be electrically connected to each other.

As explained above, in the present invention, at least one channel selection button is provided on the opening/closing lid at the cassette mounting position, and the channel selection button and the cassette in which the radio receiving circuit is incorporated are connected mechanically or electrically. By associating them with each other, the channel selection operation can be performed with the opening/closing lid closed. Therefore, there is no need to open and close the cover every time a channel selection operation is performed, as is the case with the conventional system, and the channel selection operation is therefore made very simple.

In addition, in the present invention, the channel selection button provided on the opening/closing lid is directly connected to mechanical or electrical connection means such as a push button or connection terminal provided on the surface of the cassette of the cassette in which the radio receiving circuit is incorporated. They are mechanically or electrically coupled to perform the tuning operation of the radio receiving circuit. Therefore, there is no need to interpose a special drive mechanism or the like, which simplifies the configuration and allows delicate channel selection operations to be easily performed.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette-type tape recorder, in which Fig. 1 is a front view of the tape recorder with a tuner cassette attached, and Fig. 2 is an enlarged perspective view of the tuner cassette. Fig. 3 is an enlarged perspective view of the opening/closing lid, Fig. 4 is an enlarged perspective view of the opening/closing lid.
FIG. 5 is a block diagram of the radio receiving circuit. In addition, in the symbols used in the drawings, 3...Open/close lid, 4...Tuner cassette, 7, 8...Tuition selection button, 9...Preset button, 14, 15...Tuition selection button, 16...Preset button , 30...PLL circuit,
It is.

Claims (1)

[Claims for Utility Model Registration] An apparatus main body having a cassette mounting part formed to be able to mount a cassette in which a radio receiving circuit is incorporated, and provided with a connecting part electrically connected to the cassette; an opening/closing lid provided on the main body of the apparatus to open or close the cassette mounting section; and an opening/closing lid provided on the main body of the apparatus to open or close the cassette mounting section; at least one channel selection button provided on the opening/closing lid so as to be mechanically or electrically coupled to a mechanical or electrical connection means provided on the casing surface of the cassette for channel selection; A cassette-type recording and reproducing device equipped with the following.