JPS5920189B2 - Fully automatic record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fully automatic record player, and particularly to a fully automatic record player that not only automates so-called lead-in, repeat, and cut operations, but also automates record size discrimination, song selection, etc. Regarding this.

Record size detection in conventional fully automatic record players involves manually operating operation buttons for each record size based on the record size determination by one operator.
2. There is one light-receiving window for each size of record on the top surface of the turntable, which guides the light rays incident obliquely on the top surface of the turntable to the light-receiving sensor provided on the board below the turntable. A type that detects the record size by placing a record on a turntable and a light receiving window corresponding to the record size is covered by the record, and a pair of light emitting units integrated with the head shell of the three pickups. An element and a light receiving element are provided,
By providing a plurality of radially extending light absorption grooves at equal intervals on the turntable, a pulse signal of a constant period can be obtained from the light receiving element in accordance with the position of the head shell on the radial line of the rotating turntable.

There is also known a type that automatically detects the record size by not emitting the pulse signal when the record board is placed on the turntable. An object of the present invention is to provide a fully automatic record player that enables high-precision automatic record disc size detection by cooperating with a silent groove detection device having a simple and improved structure and a new tone arm position detection device. Embodiments of the present invention shown in the drawings will be explained in detail below. FIG. 1 is a circuit diagram showing an embodiment of a silent groove detection device suitable for application to the present invention, and the silent groove detection device 1 is composed of the following components.

Namely, a light emitting element 2 is installed in the front part of the head shell of the pickup to irradiate the record surface with a light beam from above, and a light receiving element 2 is installed in the front part of the head shell in line with the light emitting element to receive the light beam reflected by the record surface. Element 3
The base is connected to the emitter of a phototransistor as a light receiving element, and the collector is connected to an LED as a light emitting element.
A common emitter transistor TR is connected to the cathode of the transistor TR, and resistors R1 and R2 are connected between the base and collector of the transistor TR and ground.

Both the collector of the phototransistor 3 and the anode of the light emitting diode 2 are connected to the positive terminal +B of the circuit power supply via a resistor R3, and a change in the voltage applied to the resistor R3 is taken out as an output. To explain the operation of this circuit configuration, when the light beam from the light emitting element 2 hits the sound groove of the record, it is irregularly reflected by the groove, so the amount of light reaching the light receiving element 3 is small, but it is almost flat. In the silent groove portion, more components are specularly reflected, and therefore the amount of received light is relatively large. This change in the amount of light is converted into a change in voltage applied to a resistor R3, which will be described later, and a silent groove on the record is detected. When the pick-up stylus is positioned above the sound groove or not on the record, the amount of light received by the light receiving element is small.
Phototransistor 3 is in an inactive (0FF) state. Therefore, the transistor TR is not supplied with a predetermined base potential and is in an OFF state. Therefore, the circuit current flows from power source +B to resistor R3 to light emitting diode 2 to resistor R2 to ground, and is a low level current. Next, when the stylus is positioned above the silent groove, the phototransistor becomes active due to the increase in the amount of reflected light, transistor TR becomes 0N state, and the circuit current changes from +B → R3 → light emitting diode 3 → transistor TR → ground , the amount of current increases and the resistance R
3 is detected as a high level voltage.
In the conventional silent groove detection device, a light receiving detection circuit and a light emitting source driving circuit are provided separately, and the light source and light receiving section provided in the head shell are connected to each circuit provided on the board side of the pick-up arm. In other words, the number of connector pins in the head shell connector connection is at least 4 in addition to the 4 pins for left and right channel signals.
I needed a book.

Providing as many as 8 no-pins in a connector that is subject to severe space limitations is
The shape of the connector cannot be made smaller, the reduction in pin spacing tends to cause signal crosstalk and deterioration of sound quality, and it is difficult to ensure compatibility with current head shells. It was hot.

The silent groove detection device applied to the present invention has two terminals for the light emitting source section and the light receiving section as an optically coupled positive feedback circuit, as shown in the circuit described above, so that the device 1 installed in the head shell can be connected to a connector. One pin corresponding to point 4 is sufficient.

(Point 5 uses the arm itself) Therefore, all of the above-mentioned drawbacks of conventional detection devices are eliminated, and a very highly sensitive, simple and lightweight detection device can be realized. 2 and 3 show an embodiment of a tone arm position detecting device suitable for application to the present invention, in which a tone arm 11 equipped with a head shell 10 is installed on a tone arm moving table 12, and a tone arm position detecting device is shown in FIG. Reference numeral 11 is a device that moves in the x-axis direction together with a moving table to perform so-called linear tracking.

A mask plate 13 is fixed to the movable table 12, and the opaque mask plate 13 has windows A group (Al, A2), window B group (Bl, B2), and tone arm position regulating window C group (
Cl, C2, C3) are provided. A pair of light emitting elements 1 are arranged opposite to the window B1 so as to sandwich the front and back surfaces of the movable mask plate.
4B and a light receiving element 15B are provided. (Fig. 2) Similarly, two other sets of light emitting elements 14A, 14C and light receiving elements 15A, 15C (not shown) are connected to window group A and window C, respectively.
These three sets of elements are arranged in the Z-axis direction and fixed to a device substrate (not shown) as shown in FIG. Windows Al, Bl, and Cl are for detecting 30 cm record-sized discs; similarly, windows A2 and C2 are for detecting 25 cm discs, and windows B3 and C3 are for detecting 17 cm discs. , window A1 and window A2
The distance between the
The distance between 11C2 and window C3 is almost 4cm (?=4゛)
is set to .

At the position of the mask plate shown in FIGS. 2 and 3, the light rays emitted from the light emitting elements 14A, 14B, and 14C all pass through the windows Al, Bl, and Cl, respectively.
The light is received by the common elements 15A, 15B, and 15C, and as a result, a high-level logic signal W1'' is obtained from each light receiving element.Next, the mask plate 13 is moved along with the moving stage 12 in the X direction.
When moved approximately 2.5 cm and approximately 4 cm, a logic signal 11' is obtained from the light receiving elements 15A, 15C and 15B, 15C, respectively. The outputs for each case described above are shown in the table below.

In this way, the size of the record is automatically determined based on the presence or absence of output from each light receiving element and the combination of the output from the silent groove detection device described above.

Next, Figures 4 and 4 show how the output signals of each light receiving element are combined with the output (DSO) of the silent groove detection device described above with reference to Figure 1 and processed to perform full auto play. This will be explained with reference to FIG. When the stylus (not shown) of the head shell 10 is positioned directly above the outermost edge of a 30 cm record (the silent groove immediately before the first track starts), the mask plate 13 is moved as shown in FIGS. Since the position shown in Figure 3 is taken, the light receiving element 15
As shown in the table above, a 3-bit logic signal [1, 1, 1] is obtained from A, 15B, and 15C.

Of these, 2 obtained from the light receiving elements 15A and 15B
The bit binary logic signal [1,1] is input to flip-flops FF2 and FF3 and stored as inputs MS1 and MS2, respectively, in the storage and signal processing circuit shown in FIG. By storing the signals MS1 and MS2 as position information of the tone arm 11, as will be described in detail later, when the tone arm is located outside the record surface, malfunctions can be prevented in any case to prevent the arm from falling. If this is possible and the tone arm is above the record surface, the microprocessor 50 (
The instructions from FIG. 5) make it possible to control the tone arm quickly and reliably.

In FIG. 5, the player's operation button hood 20 is provided with play, play stop, repeat and clear buttons in addition to the player's power switch, and a group of switches 21 for automatic song selection (up to 10 songs). It is being

Now, when the power switch is turned 0N, the signal 1RST that appears in response to the power on is the NOR gate NO in Figure 4.
Since the start signal STRT, which is generated when the tone arm 11 is in the rest position (the arm's normal rest position), is input to one human input terminal of Rl, and is similarly supplied to the other input terminal, the NOR gate NORl The output will be 110''.

The output of the NOR gate NORl is connected to the reset terminals (negative logic operation) of flip-flops FF2 and FF3, and the output of the NOR gate NORl is 10W.
And FF3 is reset. The output of the NOR gate NOR1 is connected to one input terminal of the NAND gate NAND4, and the output of the NAND gate NAND3 whose output is connected to the other terminal is 11V1.
0! Even if the output is 1, the output of NANI) 4 becomes 1, this output is inverted via the inverter 40, and the signal 1107 is input to the reset terminal R of the flip-flop FFl. On the other hand, since flip-flop FFl operates in negative logic, the ENBL signal is output from the Q terminal. Here, the above-mentioned resetting operation of flip-flops FF2 and FF3 and generation of the ENBL signal in flip-flop FF1 may be performed by detecting that tone arm 11 is in its rest position. When the stylus of the head shell 10 reaches just above the outermost edge of the record, signals MS1, MS2 are sent from the light receiving elements 15A, 15B and 15C of the record size detection device.
The ASO and the output signal DSO of the silent groove detection device are input to the J terminals of the NAND gate NAND2 and flip-flops FF2 and FF3, as shown in FIG.
Output 11011 of NAND gate NAND2 is flip 0
Trigger terminal (T) of flop FF2, FF3 [negative logic]
As a result, signals MS1 and MS2 are input to the J terminals of flip-flops FF2 and FF3, respectively, and the outputs of flip-flops FF2 and FF3 are inverted from high level to low level, and WOW appears at terminal Q. Next, the output of the NAND gate NANDl becomes O, so the flip-flop FFl is inverted, and the output signal ENBL appears at the Q terminal. By this ENBL signal, the tone arm is released from the malfunction prevention restriction and is put into a playing state at any time according to an instruction from the system control device 52 (FIG. 5). After that, for example, while playing a 30cm record, when the tone arm 11 performs linear tracking and reaches a position corresponding to the outermost edge of the 25cm record, it happens that there is an interval between songs on the 30cm record. When a silent groove exists, the output signal ASO from the light receiving element 15C, the output signal DSO of the silent groove detection device, and the output signal M from the light receiving elements 15A and 15B.
Each signal of Sl and MS2 is input to the NAND gate NAND2 and flip-flops FF2 and FF3, but the ENB
Since there is no L signal, the output of the NAND gate NAND2 does not change, the states of flip-flops FF2 and FF3 do not invert, and the initial memory is retained.

When the record playing ends, the tone arm rises and moves toward the arm's rest position. When the tone arm reaches the outermost edge of the record, signals MSl and MS2 are emitted from the light receiving elements 15A and 15B.
They are exclusive logic circuits EXORl and EXOR, respectively.
2 and also the circuits EXORl and EXOR
The Q terminals of flip-flops FF2 and FF3 are connected to one input of the flip-flop FF2, and since the Q terminals are O at this time, the outputs of EXOR1 and EXOR2 become "11".The AND gate AND1 receives the signal ASO and the tone Since the signal FREV indicating that the arm has finished playing and is moving toward the rest position is input, the output of the AND gate ANDl becomes 1.

The input of the NAND gate NAND3 includes the circuits EXORl,
The output from EXOR2 and the AND gate ANDl is applied, and the output becomes 0. The output of the NAND gate NAND4 is inverted by the inverter 40 and sent to the flip-flop F.
It is input to the R terminal of Fl. So flipflop F
Fl is inverted and outputs the ENBL signal. When the tone arm reaches the rest position, the signal STRT is input to the NOR gate NOR1, so the flip-flops FF2 and FF3 are reset by the output of the NOR gate NOR1, and the record size information is cleared.

The microprocessor 50 in FIG. 5 inputs information from each operation button installed on the operation button board 20 and a group of automatic music selection switches 2 via a memory circuit 51.
1 and information from the silent groove detection device 1, calculates and processes the data, and outputs a signal to operate the mechanism for operating the tone arm and the mechanism for driving the turntable. be.

As this microprocessor, NEC Corporation (N
μCOM-80) made by EC can be used. Next, talking about the automatic song selection operation, for example, the second song on a record,
If you want to play the 5th and 7th songs, boat 20
By pressing buttons 2, 5, and 7 of the switch 21, the selected song and its ranking are stored in the storage circuit 51. Next, when the PLAY button is pressed, the instruction information is input to the microprocessor 150, and the output from the microprocessor 50 is sent to the mechanism that operates the tone arm and the turntable drive mechanism, and the tone arm 11 is At the same time as it detaches from the armrest and starts moving toward the record edge, the turntable starts its rotation. The record size is detected by both outputs from the silent groove detection device 1 and the arm position detection device using a mask plate. The output from both devices (DSO, A
ENABLE by SO) and play signal (PDO)
By generating a signal and inputting it to the microprocessor 50, it is confirmed that the tone arm has reached above the surface of the record. When the tone arm moves linearly above the record surface, the silent grooves between songs detected by the signal DSO are detected and the number of silent grooves is also counted by the microprocessor 50. This count number and the memory stored in advance in the memory 51 are compared in the microprocessor 150, and when they match, an instruction is output from the microprocessor 1 and the tone arm is lowered via the tone arm operating mechanism. In other words, the stylus is lowered onto the board and the selected song is played. When all of the songs selected in this manner have been played, the performance end information is obtained by comparing the count by the silent groove detection device with the memory of the memory circuit 51 in the microprocessor. It will be done. Then, the tone arm returns to the armrest and stops due to the operation of the tone arm operating mechanism. It becomes stopped. Note that when the clear button in the button board is operated, the memory contents of the automatic music selection memory circuit 51 are cleared via the microprocessor.

As shown in Fig. 3, windows Cl, C2, and C3 are set to have smaller widths in the X-axis direction than other windows, but this is because the windows Cl, C2, and C3 are set to have smaller widths in the A specific position of the outer peripheral edge (i.e., the first
This is to ensure that the silent groove immediately before the start of a song is correctly determined to be a record edge. As described above, according to the fully automatic record player according to the present invention,
The following effects can be obtained.

1. The record size is completely automatically adjusted by signals obtained from both the tone arm position detection device using a mask plate and the silent groove detection device, and the needle is moved to the record edge (the part immediately before the start of the first track). ) can be lowered with high precision.

2. The silent groove detection device has a configuration in which the light emitting light source section and the light receiving section are integrated into one system, thereby simplifying the structure of the wiring system and the connector.

3. The system control device is configured so that the tone arm will not be operated unless signals from both the tone arm position detection device and the silent groove detection device are present at the same time. This prevents malfunctions such as falling and damaging the cartridge.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of a silent groove detection device suitable for application to a fully automatic record player of the present invention, and FIGS.
The figures show a plan view and a front view of an embodiment of a tone arm position detecting device suitable for application to the present invention, and FIGS. 4 and 5 show output signals from the silent groove detecting device and the tone arm position detecting device, and FIG. 2 is a block circuit diagram of an embodiment for explaining the operation of the fully automatic record player of the present invention based on information issued by various operation buttons on the operation button board. Explanation of symbols, 1... Silent groove detection device, 2... Light emitting element, 3... Light receiving element, 10... Head shell, 11
...Tone arm, 12...Moving table, 13...Mask plate, 14A, 14B, 14C...Light emitting element, 15
A, 15B, 15C... Light receiving element, Al, Bl, Cl
... window, 20 ... operation button board, 21 ... switch group for dynamic music selection, 50 ... microprocessor one,
51... Memory circuit, 52... System control device.

Claims (1)

[Claims] 1. In a fully automatic record player equipped with a system control device that controls automatic operations such as automatic lead-in and automatic song selection based on instructions from various operation buttons and detection devices installed on the record player, A silent groove detection device that optically detects silent grooves that exist between songs, and a light emitting element and a light receiving element are arranged facing each other across a mask plate that moves with the tone arm. A record size detection signal is output as a coded binary signal by forming a plurality of windows on the mask plate for each record size so that the light from the light emitting element enters the light receiving element when the record size reaches the position. and a record size detection device, wherein the system control device determines the record size by detecting that detection signals from both of the detection devices are output simultaneously. record player.