JPS58122661A - Intermusic detector in record player - Google Patents

Abstract

PURPOSE:To prevent malfunction due to noise, by cutting off a DC being one output of a pair of intermusic sensors, generating an intermusic registration permitting number, and detecting the intermusic according to the intermusic signal when the permission signal is generated. CONSTITUTION:The tip of a pickup arm is provided with a light emitting element 49 and two photodetectors 50a, 50b closely to form an intermusic sensor 46. An output of the detectors 50a, 50b is amplified OP1, OP2, differentially amplified 66, an intermusic signal is generated and an intermusic registration permission signal is generated based on the output of the 50b with DC cut-off C0. When this signal is generated, the intermusic is detected in response to the said intermusic signal. Then, the intermusic is detected surely without miss-detection of noise component generated near a lead groove.

Description

[Detailed description of the invention]

The present invention relates to inter-music detection V1w, and particularly to program performance.
The present invention relates to a track interval detection device in a record player. The purpose is to provide a song interval detection device that can distinguish between song gaps and lead-out grooves and accurately detect only song gaps. The song interval detection device according to the present invention generates a song interval signal based on the calculation output of each output of a pair of song interval sensors provided near the tip of a pickup arm, and further includes one song interval sensor whose direct current is cut off. An inter-music registration signal is generated based on the output of the inter-music registration signal, and when this inter-musical registration permission signal is generated, an inter-musical interval is detected in response to the inter-musical signal. Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic perspective view showing a record player according to the present invention, in which (a) is a closed state;
(b) shows an open (0 pen) state. As shown in FIG. 1, the record player 1 according to the present invention has a so-called front loading configuration in which a disc (not shown) can be set from the front of the main body. That is, the open/
By pressing the close key 2a, the spindle base 4 on which the turntable 3 is mounted moves forward and protrudes toward the front of the main body (in an oven state), and after placing the disc on the turntable 3 in this oven state, it is opened again.
By pressing the c1ose key 2a, the slide base 4 is moved back to the closed state and a disc is set. In addition, in the closed state (a), fully automatic performance by program selection is possible, and it is like an oven! In II(b), performance can be performed manually. Although a door to be provided on the front side of the main body is not shown, the door also performs opening/closing operations in conjunction with the slide base 4 during opening/closing operations. The pickup arm 5 is located at the rear end of the slide base 4 in order to reduce the width of the slide base 4 and to facilitate setting of the disc on the turntable 3, and this position is used as a rest position. This pickup arm 5 has an area X shown in FIG.
The lead-in operation is performed by rotating in the opposite direction to 30 c+a1. -Pl! After reaching position B, which is slightly outside the outer edge of , it rotates in the direction toward the pre-specified song interval. The pickup arm 5 has two drive systems for rotating the rotation range from the rest position 1fA to the position B, namely, a first drive system that mechanically drives the pickup arm 5.
drive system (hereinafter referred to as mechanical drive system), and a second drive system (hereinafter referred to as mechanical drive system) that drives the pickup arm 5 with oil by electromagnetic force.
(hereinafter referred to as DD drive system). An arm stopper 18 is provided on the player housing side, and an arm stopper 48 is provided on the slide base 4 side, and when the slide base 4 is stored in the housing, the pickup arm 5 is in contact with the arm stopper 18. (rest in). At this time, since a spring 30 is interposed between the pickup plate 27 and the magnet holder 28 as will be described later (in FIG. 3), the bottle member is fixed to the pickup plate 27 and driven by the mechanical drive system 7. 12 resists the biasing force of the spring 30 and waits in a disabled state. When the slide base 4 moves forward, the arm stopper 18 and the pickup arm 5 are separated, so that the bottle member 12 is no longer pressed, and the pickup arm 5 rotates backward until it comes into contact with the arm stopper 4a. By doing this, the pickup arm 5 does not get in the way when the disc is attached or removed, and the space factor when storing the disc is improved. 3 and 4 are a schematic plan view showing the drive mechanism of the pickup arm and a perspective view of each part before assembly. In FIGS. 3 and 4, the mechanical drive system 7 includes a rotary member 8 that has gears on its outer periphery and is rotatable coaxially or concentrically with the rotation center axis of the pickup arm 5, and a drive source. a rotary motor 9; a power transmission section 10 that is composed of a combination of gears and transmits the driving force of the rotary motor 9 to the rotating member 8;
A latch mechanism 11 provided on the rotary member 8 is provided, and the latch mechanism 11 selectively engages the bin member 12 that interlocks with the pickup arm 5 in accordance with the rotation of the rotary member 8, thereby locking the pickup arm 5. It is driven in a first rotation range from the rest position A to a position WC near the center of the disk. The latch mechanism 11 includes a swing arm 14 pivotably supported by a bottle 13 implanted in the rotating member 8;
Idbin 1 is provided integrally with this swing arm 14.
5, and a guide hole 16 formed in the rotating member 8 to guide the rotating member 8, and a swinging arm 14 to position the swinging arm 14 in the engagement position 1fP or non-engagement position Q where the swinging arm 14 can be engaged with the bottle member 12 described above. When the swinging arm 14 is in the engagement position P, the swinging arm 14 cooperates with a gripping member 18 mounted on the rotating member 8 to grip the bottle member 12, thereby causing rotation. The pickup arm 5 is rotated in accordance with the rotation of the member 8, and when the pickup arm 5 reaches the device C, it is reversed to the non-engaging position Q and disengaged from the bin member 12. Stops driving. 17'i', the DD drive system 19 is, for example, the pickup 7-
In the second rotation range, which includes a movable magnet provided on the arm side and a fixed coil provided on the arm stand side, from approximately the center position of the disc to position B slightly outside the outer edge of the 30C LP disc. The pickup arm 5 is driven. The movable magnet 20 is fixed to a rotating shaft (not shown) of a pickup arm 5 rotatably held by a bearing 22 of an arm stand 21 so as to face a yoke 23 at a predetermined distance from each other. , are magnetized in the thickness direction so that different magnetic poles in the circumferential direction are arranged alternately in correspondence with drive coils and speed detection coils, which will be described later.
A board 24 is attached to the arm stand 21 so that the board 24 has a pair of drive coils 25a and 25b that cooperate with the magnet 20 to rotate the pickup arm 5 by electromagnetic force, and a rotation of the pickup arm 5. A speed detection coil 26 that detects the moving speed is fixed. The pair of drive coils 25a and 25b are arranged at approximately 180 degrees around the rotational center axis of the pickup arm 5, and the speed detection coil 26 is located at the drive coil 25a.
, 25b in a positional relationship of approximately 90 degrees. Drive current is supplied to the drive coils 25a and 25b from a horizontal drive circuit (described later) when the pickup arm 5 reaches position D (shown in the third figure), and when the pickup arm 5 reaches position 11c, the drive system switches to the mechanical drive system 7. to the DD drive system 19, and the second
DD drive system 1 in the rotation range (position IfD to position B)
At the same time, the output of the speed detection coil 26 is fed back to the horizontal drive circuit, and the speed of the pickup arm 5 is set to 1 m. In order to ensure the switching from the mechanical drive system 7 to the DD drive system 19, overlapping portions (positions 11[) to C) are provided in the first and second rotation ranges. For example, a pickup arm 5 is located below the magnet 20.
A pickup plate 27 is provided so as to be rotatable with respect to the rotation axis of the magnetic boulder 2.
The pickup arm 5 is
The magnetic bolt 28 is attached to the magnetic bolt 28 for position adjustment in a horizontal plane relative to the pickup arm 5, and rotates together with the pickup arm 5. A spring 30 is interposed between the pickup plate 27 and the magnet holder 28, and the aforementioned pin member 12 is fixed to the pickup plate 27. As shown in FIG. 5, the pickup plate 27 is provided with a slit portion 31 consisting of a large number of slits to enable address setting corresponding to the rotational position of the pickup arm 5.
is formed. And the pickup arm 5 is the second
An address A sensor 32a and an address B sensor 32b are provided so as to be located in the slit portion 31 of the pickup plate 27 when the pickup plate is in the rotation range (positions D to B in FIG. 3). The A and B sensors 32a and 32b are used to constantly monitor the needle tip position of the pickup arm 5 in accordance with the address, and the address B sensor is 90' ahead of the address A sensor in phase. Furthermore, pickup plate 2
A DD area sensor 34 that is located on the co-movement locus of the shutter part 33 of 7 and detects the DD area (positions D to B in FIG. 3) of the pickup arm 5, and an end area sensor 35 that detects the rear of the end 1. It is provided. DD
The output of the 1 rear sensor 34 switches the mechanical drive system 7 to the DD drive system 19 during lead-in operation. The output of the end area sensor 35 allows full automatic performance of program performance 1. To enable end detection based on each output of an address sensor at address A1 during manual performance. These sen+j
-32a, 32b, 34 and 35 are light-emitting and light-receiving elements disposed to face each other with the pickup plate 27 in between, and as shown in FIG.
It is housed in a holder 36 that can be attached to. In FIGS. 3 and 4, the rotating member 8 of the mechanical drive system 7
Above is the elevation cam 37 of the pickup arm 5.
is provided. One end □ of an elevation shaft 38 movably held by the arm stand 21 is in contact with the elevation cam 37 , and the other end of the elevation shaft 38 is in contact with the elevator shaft 38 that supports the pickup arm 5 . It is fixed to the plate 39. A spring 50 is interposed between the arm stand 21 and one end of the elevation shaft 38 to urge the elevation shaft 38 downward. On the mechanical chassis 41 on which the mechanical drive system 7 is mounted, there are switches 42 and 43 for detecting the completion of raising and lowering the pickup arm 5 due to the elevation operation, and the rest position of the pickup arm 5 (the position shown in FIG. 3). 11A) is provided. These switches are operated by being pressed by a cam portion 8a provided on the outer periphery of the rotating member 38. The ascent completion detection switch 42 is also used to detect the position just before the pickup arm 5 starts descending due to the elevation operation during the lead-in operation. That is, during the lead-in operation, the pickup arm 5
The mechanical drive system 7, which precedes the rotation of the pickup arm 5 by the DD drive system 19 in the second assistance range after the drive operation of A special machine is used just before the final stage of the process. The rotating member 8 of the mechanical drive system 7 starts rotating again in order to lower the pickup arm 5 in response to a lowering command issued when the pickup arm 5 reaches the desired song M1. FIG. 6 shows a schematic perspective view of the pickup arm assembly including the DD drive system 19 and the big door knob plate 27 mentioned above. A song interval sensor 46 is provided at its tip to distinguish between songs and sound grooves by utilizing the difference in reflectance between songs. As shown in FIG. 7, the song interval sensor 46 uses a single light emitting element 49 such as a light emitting diode located in a vertical plane including the tip 48 of the cartridge 47 as a common light source.
It is composed of this light emitting element 49 and two light receiving elements 50a and 50b, such as phototransistors, arranged along the rotating direction of the pickup arm 5 so as to be symmetrical with respect to the vertical plane. Preferably, it is arranged near the tip 48. As shown in FIG. 8, the light receiving element 50a is activated when the pickup arm 5 rotates toward the outer circumference of the disk. It precedes Ob and receives reflected light from the disk 6 based on the irradiated light from the light emitting element 49, and generates an output according to the amount of received light. On the other hand, the light receiving element 50
b precedes the light-receiving element 50a when the pickup arm 5 rotates toward the inner circumference of the disk, and similarly, the light-emitting element 49
It generates an output according to the amount of light reflected from the disk 6 based on the irradiated light from the disk. The light-receiving elements 50a and 50b generate outputs as shown in (a) and (b) in FIG. 9, respectively, during the song interval 6a of the disc 6, and when the stylus tip 4B of the cartridge 47 is located on the center of the song interval, In this case, the outputs (a) and (b) have the relationship shown in FIG. 9 with respect to the center of the song. FIG. 10 is a block diagram showing an example of the control l1 part;
This figure is a circuit diagram showing a specific example of a part of FIG. 10. In FIGS. 10 and 11, 51 is a system controller that centrally controls all of the blocks, and is composed of, for example, a 4-pit microcomputer. This system controller 51 has an operation 81S.
2, a signal indicating the operating state of one system from the switch section 52, an address signal from the 1 address sensor section 53, an inter-music signal from the inter-music sensor section 54, etc. are applied. In response to these signals, the system controller 51 activates the DD drive system 19 and the DD synchro circuit 58.
etc. to send out control signals. The operation unit 2 is provided with all operation keys for selecting program music, command keys for commanding various operations, and light emitting diodes for displaying the operations of these keys.7 The one-way drive unit 56 receives the control ltg signal from the system controller 51 and the descent completion detection switch 4.
This is an interface that drives the arm drive motor (rotary motor) 9 of the mechanical drive system 7 in response to the output signal of the mechanical drive system 7. The loading drive section 57 is a system control

[”-ra5
1 is an interface for driving a loading t-taro 0 for moving a slide base 4 (FIG. 1) in response to control signals from a slider 4 (FIG. 1). D-1 synchro circuit 58
is an interface circuit for sending a recording synchronization signal to a selectively connected tape deck (not shown) in response to a control signal from the system controller 51 when the synchronization switch 61 is turned on. Here, the synchro output terminal 62 of this system is connected to the remote pause terminal of the tape deck, and when the synchro output terminal 62 of this system is put in the recording pause state and the synchro switch 61 is turned on, the deck goes into the recording state while the player is playing. This is a function in which the deck enters a pause state when the player is in an elevation-up state or while the arm is moving, and the deck repeats pause-recording (pause release) every time one pulse is input to the pause terminal. There is. The switch section 52 is provided with switches 42 and 44 for detecting the completion of raising the pickup arm 5 and the rest position, as well as switches 63 and 64 for detecting the closed state and open state of the player body. FIG. 12 is a circuit diagram showing a specific example of the inter-song sensor part 54 in FIG. 10. In this figure, the inter-track sensor 4
6 consists of a single light emitting element 49 and two light receiving elements 50a and 50b as explained in FIG.
a and 50b each receive the reflected light from the disk 6 and generate an output according to the amount of the received light. The two sensor outputs are connected to operational amplifier OP1. After being amplified by an amplifier circuit 65 including OP2, it is supplied to a differential amplifier circuit 66, and one sensor output is also supplied to an AC amplifier circuit 67. The two sensor outputs obtained at the output end of the amplifier circuit 65 have waveforms as shown in FIG. 13(a). Figure 13 (a
), (a) is between songs, (b) is an introductory groove, (c) is
indicate the lead-out grooves, respectively. Differential amplifier circuit 66 inverts the two sensor outputs. The operational amplifier OP3 having a non-inverting input is used to differentially amplify the outputs of the two sensors, thereby obtaining an output waveform as shown in FIG. 13(b). It is clear from FIG. 13(b) that the differential signal between songs has a substantially S-shaped curve. The differential signal becomes the transition between the operational amplifier OPa constituting the inverter 68 and the operational amplifier OPs constituting the zero cross comparator 69 between songs. Operational amplifier OP4
A reference level VTI-1 is applied to the inverting input terminal of , and the reference level VT14 changes according to the sensitivity selection by the sensitivity selector switch 70, and even if the sensitivity is the same, the pickup arm 5 moves up and down. It also changes depending on. This is done so that even if the amount of light received by the light-receiving elements 50a and 50b of the song-interval sensor 46 changes between up and down times, by changing the reference level VTI-1, it is possible to reliably discriminate between songs and tone grooves. The switch means 71 is turned on and off in response to the elevation movement of the pickup arm 5.
By turning off the reference level VT)-1 is switched. The output of the operational amplifier OP a is input to the system controller 51 (terminal 15 in FIG. 11) as an inter-song signal. The AC amplifier circuit 67 cuts the direct current from one sensor output of the amplifier circuit 65 with a capacitor Co and operates an operational amplifier OPs.
After performing AC amplification, the signal is supplied to the non-inverting input terminal of the operational amplifier OPy that constitutes the search comparator 90. In the zero cross comparator 69, the operational amplifier OPs has the fixed M quasi-4 voltage Bz as an inverting input, and the differential amplifier circuit 6
The zero-cross point of the differential signal from 6 is detected and the zero-cross signal is output. On the other hand, the search comparator 90
The operational amplifier OPy has an inverting input of the same reference level VTH as the operational amplifier OP4, and upon receiving the signal from the AC amplifier circuit 67, outputs a signal with the reference level V-chome as a song section registration permission signal. Zero cross signal and song ll
The registration permission signal is input to the gate circuit 72, and the pickup arm 5
When the system controller 51 (terminal 1 in Fig. 11
4). The system controller 51 detects the center between songs during performance based on the zero-cross signal and the inter-song signal. The above-mentioned on/off operation of the switch means 71 is performed based on the mute signal. FIG. 14 is a circuit diagram showing a specific example of the DD drive system 19 in FIG. 10. The DO drive system 19 includes drive coils 25a and 25b connected in series, a horizontal drive circuit 73 that supplies drive current to the drive coils, and a speed detection coil 2.
6, and an amplifier circuit 74 that amplifies the minute detection voltage of this detection coil. The horizontal drive circuit 73 is composed of a differential amplifier 75 consisting of an operational amplifier OPg and a gain control inverter 76 consisting of an operational amplifier OP9.
The band servo signal from the speed detection coil 26 is applied to the non-inverting input terminal, and the speed servo signal from the speed detection coil 26 amplified by the amplifier circuit 74 is applied to the non-inverting input terminal. By supplying current, the pickup arm 5 is driven while controlling its speed. The band servo signal and the speed servo signal are each supplied to the differential amplifier 75 as necessary by switch means 77 and 78 that turn on and off in accordance with control from the system controller 51. The amplifier circuit 74 has an operational amplifier OP+o, and amplifies the minute amount of power generated by the speed detection coil 26 according to the rotational speed of the pickup arm 5 to output the horizontal drive circuit 73.
It is output as a speed servo signal to. In the amplifier circuit 74, VR+ is a volume for offset adjustment. Here, the band servo operation will be explained. As explained based on FIG. 13(b), the differential output of the differential amplifier circuit 66 in the inter-song sensor portion 54 exhibits a figure-eight curve characteristic as shown in FIG. The differential output becomes the band servo signal. Assuming that the needle tip 48 has now moved to the outer circumference of x (lIll) with respect to the center of the song, V
(v) band servo signal is generated. In response to this signal, a current is supplied from the horizontal drive circuit 73 to the drive coils 25a, 25b, and the needle tip 48 moves in the inner circumferential direction until it is over the center of the curve. In this way, always keep the needle tip 48 at the center 1 of the curve.
Control to position the band at − is called band servo. The band servo operation is controlled so that it starts when the pickup arm 5 reaches the top of the song interval during program play and ends when the down is completed. When the pickup arm 5 is operated by the system controller 51 based on commands such as start and stop from the operation unit 2 and other program play, the drive voltage generated by the drive voltage generation circuit 79 (FIG. 11) is calculated. A reference voltage is applied to the inverting input terminal of the amplifier OPs, and the drive voltage generation circuit 79 generates a reference voltage based on a control signal indicating high-speed, inner circumferential direction and outer circumferential direction drive output from terminals 26, 27 and 28 of the system controller 51. The moving speed and direction of the pickup arm 5 can be controlled by changing the value and polarity of the driving voltage. In FIG. 14, a cancellation coil 80 is integrally provided with the drive coil 25b and is connected in series with the speed detection coil 26. This canceling coil 80 is intended to increase the S/N ratio of the output of the speed detection coil 26 by canceling noise components generated by the drive coils 25a and 25b, thereby improving the stability of the speed servo. That is, when a current is passed through the drive coils 25a and 25b to drive the pickup arm 5, magnetic flux is generated by this current, and an alternating current flows through the speed detection coil 26, creating a noise component. By placing it in series with the AC component, the alternating current component can be canceled. A variable resistor VR2 is connected in parallel to the canceling coil 80, and the amount of canceling is variable by this variable resistor vR2. FIG. 16 is a circuit diagram showing a specific example of the address sensor part 53 in FIG. 10, which includes a light emitting section 53A having four light emitting diodes and a light receiving section 53A having four phototransistors arranged opposite to these light emitting diodes. Section 53B
According to address A, B sensor 32a, 32b, DD
An area sensor 34 and an end area sensor 35 are configured, and a pickup plate 2 that interlocks with the pickup arm 5 controls the gap between the light emitting section 53A and the light receiving section 53B.
7 rotates. Each output from the light receiving section 53B is waveform-shaped by inverters 82 to 85 constituting a waveform shaping circuit 81, and is outputted to the disk 6 at the timing shown in FIG. 17 during the lead-in operation of the pickup arm 5. The end area signal (a) is sent to terminal 10 of the system controller 51, the address A signal (b) is sent to terminal 12, and address B is sent to terminal 12 of the system controller 51.
The signal (C) is applied to the terminal 13, and the DD area signal (d) is applied to the terminal 11. The role of each sensor is the 5th
This is as explained in the figure. Next, the operation of the above-described configuration will be explained. First, the operation when playing a program by specifying the third song → first song on a 30 cm 1p disc will be explained based on the timing charts shown in FIGS. 18A and 18B. It is assumed that the disc 6 has already been set, the player body is in the closed state, and the pickup arm 5 is in the rest position. When setting a program, after turning on the power at time t1, turn on the music selection key "3" on the operation section 2, and a light emitting diode (hereinafter abbreviated as LED) r3J (
u) appears to be lit, but actually blinks once and then lights up),
Indicates that the third song has been programmed. Next, select the song key “1”
When j is turned on, LED rIJ (v) lights up in the same way. 1 (If you make a mistake in setting 1 gram, turn on the stop key to clear Progera 4, so you can set it again. After completing the program set,
When the start key is turned on at time t2, the terminal 8 (h) of the system controller 51 becomes L level, the rotary motor 9 (j) of the mechanical drive system 7 starts rotating in the arm lead-in direction, and auto lead-in starts. do. At this time LE
At the same time that "W" lights up to indicate the start of auto lead-in, the rest position detection switch 44 (
a) is reversed. Pickup arm 5 continues lead-in and needle tip 48
At time t3 when the DD area sensor 34 reaches the vicinity of the center spindle (near the center of the disk), the output (0) of the DD area sensor 34 is input to the terminal 11 of the system controller 51 at H level, and in response, the output (0) of the DD area sensor 34 is inputted to the terminal 11 of the system controller 51, and in response, 28 (m
) respectively go to the L level, operating the DD drive system 19, and entering the DD drive range from here. After entering the DD drive range, the latch of the mechanical drive system 7 is released, and at this point, the drive system of the pickup arm 5 is switched from the mechanical drive system 7 to the DD drive system 19. Even after the latch is released, the mechanical drive system 7 continues to operate in the lead-in direction ahead of the DD drive system 19,
The cam part 8a of the rotating member 8 turns off the one-line completion detection switch 42, and the output (") of this switch 42 is inputted to the terminal 39 at H level, and in response, the terminal 8 (h) goes to H level. Terminal 9(j) transitions to L level, rotating motor 9(j)
When the motor is reversed in the lead-out direction and the ascent completion detection switch 42 is turned on again, terminals 8 (h) and 9 (j) become H level, the rotating motor (j) is stopped, and the ascent completion detection switch 42 is turned on. Wait in state. While the high-speed lead-in operation by the DD drive system 19 continues, the system controller 51 performs the time! :
Address counting is started based on pulse signals from address A sensor 32a (p) and B sensor 32b (Q) input from at3 to terminals 12 and 13, and from time t4 when a predetermined address is reached, inter-song registration is started. Search begins. Then, when the pickup arm 5 is raised (during a search), a song interval signal (S) is inputted from the song interval sensor part 54 to the terminal 14 and manually inputted to the terminal 15 in response to the song interval θ recording permission number (r). and register addresses sequentially from between songs on the disc. At time t5 when the pickup arm 5 reaches the search end address outside the outer edge of the 30cn+LP disc, a final disc size determination is performed. Size determination is 17cm, 25cm and 3Qcm in advance.
The final θ edge (
This is done by sequentially comparing the address of the song on the outer periphery) as shown in the flowchart in Figure 19 during the search, and if the relationship of last registered address - ≦ sunny position address + 3 is established, then the alighting position at that time is determined. The actual disk size is determined from In addition, the address of the famous song near the last joining song registered between songs during the search and the descending address -5 (
If the relationship of address of famous song near the final θ edge song ≧ descent address - 5 is established, that song is not considered as a song and is deleted. The songs will also be revised. After the size determination is completed, terminal 2 of the system controller 51
7 (+) goes to L level, terminal 28 (g+) goes to H level (terminal 26 remains at L level), and DD drive system 19
As a result, the pickup arm 5 moves at high speed toward the third song, which is the first program song, and enters an operation for detecting the third song. At this time (time t5
), at the same time, the terminal 4(d) goes to L level, starts the phono motor 55, and rotates the turntable 3(e). Furthermore, the LEDr3J(u,) that was in the lit state repeats blinking from time t5 until the performance of the third song is completed. To explain the song interval detection operation according to the flowchart of FIG. 20, the needle tip 48 of the pickup arm 5 moving at high speed toward the inner circumference of the disk detects the registered address of the third song, for example, 4.
When it arrives one place before (registered address +4) (time t6),
The terminal (k) becomes H level, and the moving speed of the arm becomes low. Then, in the low-speed driving state, when the song interval is detected from before the third song and the song interval signal (S) from the song interval sensor part 54 is input to the terminal 15, the system controller 51 detects the rising edge of the pulse. (time ty), the terminal 27 (+> is set to H level to stop the DD drive system 19, and the LEDs "r start" (W) and "up" (y), which had been lit up until then, are turned off. At the same time, the terminal 8 (h) is set to L level, and the rotary motor 9 (j) of the mechanical drive system 7, which has been in a standby state, is operated to start the elevation down operation.At this time, the terminal 3
(C) also goes to the L level, and the collector of the transistor Q2 (shown in Figure 11) goes to the H level, thereby making the switch means 77 (shown in Figure 10.14) conductive, turning on the band servo, and turning on the sensor between songs. The pickup arm 5 is driven in the horizontal direction by the DD drive system 19 in response to the band servo from the other station 54 (differential support signal @ of the sensor output between two songs). With this band servo, even if there is eccentricity of the disc, it is possible to follow the deviation between tracks as the disc rotates, and lower the needle tip 48 of the pickup arm 5 to position it at the center of the track. The elevation down operation continues, and at time t8, the cam portion 8a (shown in the third diagram) of the rotating member 8 turns on the descent completion detection switch 43, and when the output (a) reaches the L level, the terminal 9(i) also goes to the L level. level, the rotary motor 9(j) of the mechanical drive system 7 stops, the down operation is completed, and the performance of the third song begins. At the same time, the terminal 3(0) transitions to H level, turning on the transistor Q2, thereby turning on the switch means 77.
becomes non-conductive and turns off the band servo. Furthermore, the mute signal (b) outputted from terminal 2 disappears and becomes L level).
3 turns off the muting relay 88 and enters the performance state. Due to the transition of the mute signal (b) to the L level, the transistor Q4 in the inter-song sensor part 54 (see FIG. 12)
is turned off, the switch means 71 becomes conductive, and the operational amplifier OP4. By switching the reference level VTH of OP7, the sensitivity up/down switch of the part 54 between songs is turned down.Furthermore, due to the transition of the mute signal (d) to the L level, the output of the buffer 89 also becomes the L level, and the switch is activated. The means 78 (shown in Figure 10.14) is made non-conductive to cut off the speed servo signal from the speed detection coil 26 to the horizontal drive circuit 73 in the DO drive system 19, turning off the speed servo.At the same time, the output of the buffer 89 is turned off. As a result, the resistance R+ in the drive voltage generation circuit 79 (shown in Figure 11) becomes L level.The DD drive system 19 through R2, R3 and diode D1
The voltage balance between the inverting input terminal and the non-inverting input terminal of the differential amplifier 75 (shown in FIG. 14) is slightly disturbed to provide an anti-skating amount during performance. During song interval detection, if the song interval is not found, the search is performed further back than the registered address of the third song (registered address - 1).
), and when an interval between songs is detected, the pickup and arm 5 are stopped and controlled to shift to an elevation down operation as described above. Even if you search for the back of No. 1, the song @
If it is not found, move the pickup arm 5 toward the outer circumference at high speed, and when it reaches the address (registered address + 4), reverse the moving direction of the pickup arm 5 and move it toward the inner circumference at low speed. The same song interval detection operation as described above is repeated. If a song interval cannot be detected even after performing the song interval detection operation a predetermined number of times, for example, four times, the program moves to the song selection operation for the next program song. The third song was played, and just before the end of the performance,
For example, at address 2 before the registered address of the fourth song, the system controller 51 enters a special state where the zero cross signal (r) and inter-song signal (S) are input at terminals 14 and 15. In this state, an H-level zero-crossing signal (r> is input to the terminal 14 of the system controller 51, and a zero-crossing signal (") after one positive pulse, which is the inter-song signal (S), is input to the terminal 15. At the timing of the rising edge of , the system controller 51 detects that the needle tip has arrived between the third and fourth songs (time rs).At the time t9 when the end of the third song is detected, the H level mute is output from terminal 2. The signal (b) is output, and by turning on the transistor Q3, the muting relay 88 is turned on and cuts off the audio signal system.At the same time, the sensitivity of the inter-song sensor part 54 is switched up, and the DD drive system 19 is turned on. Turn on the speed servo. At this time, the LED "r up" (y) lights up, and the previously lit LED rlJ (v) blinks until the end of the first song.Furthermore, set terminal 8 (h) to H level. The elevation up operation is started by rotating the rotating motor 9 (j) of the mechanical drive system 7 in the upward direction. At this time, the rotating member 8 rotates and turns off the descent completion detection switch 43 (Ill). Rotating member 8 continues to rotate, and the ascent completion detection switch 42 (
f) is turned on (at time j IG > , terminal 9(i)
reaches the H level, the rotary motor 9(j) stops, and the elevation up operation is completed. At the same time, the terminals 26 and 28 become the L level, the mechanical drive system 7 operates, and the pickup arm 5 moves toward the first song. Moves toward the outer circumference at high speed. Pickup arm 5 moves between the first song (30C-
When the system controller 51 reaches the point 4 addresses past the registered address of the first song (outside the outer edge of the disc) (time point j > , the terminal 26 of the system controller 51 is at H level, the terminal 27 is at L level, 28 becomes H level, the DD drive system 19 reverses the driving direction and moves the pickup arm 5 toward the first song at low speed.Then, from the time t12 when the set address of the first song is reached, the DD drive system 19 reverses the driving direction and moves the pickup arm 5 toward the first song.
The performance of the first song begins after going through the same process as when playing the first song. However, for the first song, the band servo is not performed at the registered address, but it is vertically lowered without band servo at a preset lowering position address corresponding to each disc size. As in the case of the third song, when the end of the performance of the first song is detected, the elevation up operation is completed at time t13>. Since all the programs have been completed, the terminal 8 of the system controller 51 is at the H level at the time tI4 when the ascent completion detection switch 42 is turned on. The terminal 9 is kept at the L level, the rotary motor 9 of the mechanical drive system 7 continues to rotate in the lead-out direction, and the pickup arm 5 moves at high speed in the rest direction using this as a driving source (auto return). At the same time, the rotation of the turntable 3 also stops. The time t+s when the pickup arm 5 reaches the rest position and the rest position detection switch 44 is turned on
Then, the terminal 9 of the system controller 51 becomes H level, the mechanical drive system 70 rotation motor 9 stops, the pickup arm 5 enters a standby state at the rest position, and the program performance ends. Next, the operation during performance by manual operation will be explained based on the timing charts of FIGS. 21A and 21B. It is assumed that the loading section is initially in a closed state, and when the [Oven 7/O-Z] key is turned on at time t1, terminal 6 of the system controller 51 becomes L level, and the loading motor 60 begins to rotate in the oven direction. , the sphide base 4 protrudes toward the front as shown in FIG. 1(b). When the open operation continues and the slide base 4 turns on the open detection switch 64(e) at time t2, the terminal 6 of the system controller 51 changes to H level, the O-ding motor 60 is stopped, and the open operation is completed. do. If the open detection switch 64 is not turned on even after a predetermined period of time, for example 25 seconds, has elapsed since time point I, the motor automatically stops and waits there (fail-safe). Place the disc on turntable 3, and at point [3]
When the "Arm Manual Set" key is turned on, the terminal 19(t) of the system controller 51 goes to L level.
In response, the terminal 8(j) becomes L level, the rotary motor 9(1) of the mechanical drive system 7 starts rotating in the lead-in direction, and the pickup arm 5 starts lead-in. At this time, the terminal 4 (C) of the system controller 51 also becomes L level, causing the phono motor 55 to rotate. After that, the pickup arm 5 continues the lead-in in the same way as the automatic lead-in during program play, and the DD area sensor 3
At the time t4 when the output (q) of No. 4 is generated, the terminals 26 (+++) and 28 (o) of the system controller 51 each become L level to operate the DD drive system 19, causing the drive system to be DD driven from the mechanical drive system 7. Switch to system 19. Mechanical drive system 7 is D. It precedes the drive system 19 and stands by just before the elevation down operation. The pickup arm 5 continues lead-in at high speed, and at time t5 when the rising edge of the 103rd pulse of the output of the address A sensor 32a (<r) is input to the terminal 12 of the system controller 51, the terminal 26 (s) is input.
becomes H level, and the moving speed of the pickup arm 5 becomes low. The pickup arm 5 continues the lead-in at a low speed, and at the time t6 of the rise of the 105th pulse of the address A sensor 32a corresponding to the 30 cm lowered position, the terminal 28(0) of the system controller 51 becomes H level. , the DD drive system 19 stops and the pickup arm 5
stops in the raised position and enters the standby state for manual performance. Next, when the "elevation" key is turned on, terminal 8 (j) of the system controller 51 goes to L level.
The rotary motor 9(1) of the mechanical drive system 7 rotates in the down direction and starts an elevation down operation. At this time, the LED "r-up" (W) that had been lit until then goes out. When the cam portion 8a of the rotating member 8 of the mechanical drive system 7 turns on the descent completion detection switch 43(i) and completes the down operation (time t8), the terminal 9(k) of the system controller 51 becomes L level, and the mechanical The drive system 7 stops. At this time, the mute signal (b) which had been output from terminal 2 at the same time disappears and becomes L level), muting relay 88 is turned off and a performance state is entered. During the performance, if the "start" key is held down at time t8, the locate-in operation begins. First, at time t9, the terminal 8(j) of the system controller 51 becomes H level, the rotary motor 9(+) of the mechanical drive system 7 rotates in the upward direction, and enters an elevation up operation. At the same time, the LEDs ``Start'' (■) and ``Up'' (W) light up, and an H level mute signal @(b) is output from terminal 2, turning on the muting relay 88 and interrupting the performance. When the ascent completion detection switch 42 (h) is turned on (time j
10), terminal 9 (k) of the system controller 51
) becomes H level, and the rotary motor 9 (1) of the mechanical drive system 7
) to complete the rising state, then terminal 27 (n
), the DO drive system 19 is operated, and the pickup arm 5 is moved in the inner circumferential direction at low speed to perform a locate operation. The LED ``Start'' (V) flashes while the ``Start'' key is held down from time t10 when the locate operation begins. When the "Start" key is pressed and released at an arbitrary position (time point j u ), the terminal 27(n) of the system controller 51 becomes H level and the DD drive system 19 stops, so the pickup arm 5 is in the raised state. stop,
At the same time, the LED r start j stops blinking. Then [when you turn on the elevation j key (at time t, +2
>, the performance state is entered at time t13 through an elevation down operation in the same manner as in the case of manual lead-in. When performing a locate operation, if you keep pressing the "stop" key, the terminal 28 (0) of the system controller 51 will go to L level after the elevation-up operation is completed, and the pickup arm 5 will move toward the outer circumference at low speed. (locate out). Furthermore, regardless of whether the pickup arm 5 is in the up or down state, if the pickup arm 5 exceeds the DO drive range, the mechanical drive system 7 operates to automatically return the pickup arm 5 to the rest position (forced return). This forced return is not limited to the case where the DD drive range is exceeded, but the range can be arbitrarily set and it can be performed when the range is exceeded. When the performance continues and the stylus tip 48 comes near the lead-out groove, the output (p) of the end area sensor 35 is inputted to the terminal 10 of the system controller 51 at a high level, and the address A1
Based on the outputs (r) and (s) of the address sensor 328.32b, end detection is performed when the needle tip 48 enters the lead-out groove and the feeding speed increases. At the point when the end is detected, terminal 8(j) of the system controller 51 becomes H level (terminal 9 remains at L level), and the elevator lift operation is started. At this time, LE[)r up” (W
) lights up and the mute signal (b) is output, turning on the muting relay 88 and cutting off the audio signal system. When the ascent completion detection switch 42 (h) is turned on and the "up" operation is completed, the logic at the terminals 8 and 9 of the system controller 51 is maintained.
The mechanical drive system 7 causes the pickup arm 5 to start auto-return in the rest direction. At time t16 when the pickup arm 5 returns to the rest position, the rest position detection switch 44(a) is turned on, and at time t17, after a predetermined time has elapsed from time t16, the terminal 9(k) of the system controller 51 becomes H level. The mechanical drive system 7 is stopped and the auto return is completed. At this time, the terminal 4 (C) of the system controller 51 becomes H level and the phono motor 55 is stopped. When the [Open/Close] key is turned on at time t18, the terminal 7 (g) of the system controller 51 goes to L level, and in response, the loading motor 60 rotates in the closing direction to move the slide base 4 into the main body. Drive to store. When storage is completed and the slide base turns on the close detection switch 63 (d) (at time E)
19) In response, the system controller 51 sets the terminal 7(g) to H level, stops the loading motor 60, and completes closing, and enters a standby state for all operations. When performing so-called de-syncing, which automatically records the playback sound on a tape deck (not shown) during program play and manual play, first connect the remote pause terminal of the tape deck to the synchro output terminal 62 (11th (shown in the figure), put the deck in recording pause, and turn on the synchronization switch 61 of the system. From the terminal 25 of the system controller 51, during program performance, as shown in FIG. 18B, the signals are transmitted at times t 7 , j 10 , j +2, and 1 . . . in response to the elevation operation. An L level synchro output (1) is generated at this point. Since the deck repeats pause-recording every time one pulse is entered into the pause input, the pause is released only during performance, and only the reproduced sound can be automatically recorded. During manual performance, as shown in FIG. 218, time points t y and t
Synchro output (U) is generated at +o + L I2 and t +5, and the recording state is automatically entered only during performance. Although the above embodiments have been described with reference to the case where the present invention is applied to an offset arm, the present invention can also be applied to a linear tracking arm. As described in detail above, in the present invention, an inter-song signal is generated based on the calculation output of a pair of inter-song sensors provided near the tip of the pickup arm, and one of the inter-song signals from which direct current is cut is generated. The structure is such that a song interval registration permission signal is generated based on the output of the song gap sensor, and when this song gap registration permission signal is generated, a song gap is detected in response to the song II Yu. Since it is possible to reliably distinguish between the song interval (introduction 11) and the lead-out groove without erroneously detecting noise components generated in the vicinity, only the song interval can be accurately detected and registered during the search.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a record player according to the present invention, in which (a) shows the closed state and (b) shows the open state, and FIG. 2 is a plan view showing the operating area of the pickup arm, and FIG. 3 and 4 are a schematic plan view showing the drive mechanism of the pickup arm and a perspective view of each part before assembly,
FIG. 5 is a plan view showing the positional relationship between the pickup plate and part of the address sensor, FIG. 6 is a schematic perspective view showing the pickup arm assembly, FIG. 7 is a schematic perspective view showing the head shell part, and FIG. 8 9 is a diagram showing the positional relationship between the inter-song sensor and the inter-song period, FIG. 9 is a diagram showing the output characteristics of the inter-song sensor between songs, FIG. 10 is a block diagram showing an example of the control section, and FIG. 10 is a circuit diagram showing a specific example of a part of the inter-track sensor, FIG. 12 is a circuit diagram showing a specific example of a part of the inter-song sensor, FIG. 13 is a waveform diagram of each part in FIG.
FIG. 15 is a circuit diagram showing a specific example of the D drive system 19, FIG. 15 is a diagram showing the relationship between song intervals and band servo signals in band servo, FIG. FIG. 17 is a timing chart showing the outputs of each sensor in FIG. 16, FIGS.
Figure 9 is a flowchart for explaining the size determination operation, Figure 20 is a flowchart for explaining the song interval detection operation, and Figures 21A and 8 are for explaining the operation during manual performance. It is a timing chart figure. Explanation of symbols of main parts 2...Operation unit 5...Pickup arm 7...Mechanical drive system 8...Rotating member 9... Rotating motor 11...Latch mechanism 19...DD
Drive system 20...Magnets 25a, 25b...Drive coil 26...
・Speed detection coil 27...Pickup plate 32a, b...
... Address A, B sensor 34 ... DD area sensor 35 ... End area sensor 42 ...
・Ascent completion detection switch 43...Descent completion detection switch 46...Song interval sensor 51...System controller 53...
・Address sensor part 60...O-ding motor 70...Sensitivity changeover switch 71.77.78...Switch means 79...
... Drive voltage generation circuit 80 ... Cancellation coil 87 ... Muting circuit Applicant Pioneer Corporation Agent Patent attorney Motohiko Fujimura

Claims (1)

[Claims] a pair of song interval sensors provided near the tip of the pickup arm; a means for generating a song interval signal based on the calculated output of each output of the pair of song interval sensors; and one of the pair of song interval sensors. A DC cut circuit that cuts a DC component of the output, and means that generates an inter-song registration permission signal based on the output of the DC cut circuit, and responds to the inter-song signal when the inter-song registration permission signal is generated. What is claimed is: 1. A track interval detection device for a record player, characterized in that the track interval is detected by