JPH0145127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a pickup arm, and more particularly to a method for driving a pickup arm in a record player capable of program play.

The object of this invention is to provide a method for driving a pick-up arm that allows the needle tip to be accurately lowered to a specified track interval during a music selection operation, and to be raised accurately between tracks during tracing.

The song interval detection method according to the present invention searches for a song interval based on the output of the song interval sensor and detects the song interval at the time of lead-in operation of a pick-up arm equipped with an address sensor for detecting the arm position and a song interval sensor. The address is set based on the output and the song interval is registered, and during song selection operation, the vicinity of the specified address is detected by an address search based on the output of the address sensor, and from the point of detection, the song interval is determined based on the output of the song interval sensor. After detecting the song interval, the lowering position of the pick-up arm is controlled based on the position error signal output from the center of the song generated from each output of the pair of song interval sensors, and during tracing, the position error signal is output. Based on this, the pickup arm is raised by detecting the interval between songs.

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 indicates an open 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, by pressing the open/close key 2a provided on the operation section 2 on the front of the main body, the slide base 4 on which the turntable 3 is mounted moves forward and protrudes toward the front of the main body (open state), and in this open state. After placing the disc on turntable 3, press open/close key 2 again.
By pressing a, the slide base 4 is moved back to the closed state, and the disk is set. Further, in the closed state a, fully automatic performance by program selection is possible, and in the open state b, performance by manual operation is possible. 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 pick-up arm 5 is attached to the slide base 4 in order to reduce the width of the slide base 4 and to make it easier to set the disc onto the turntable 3.
This position is the rest position. This pick-up arm 5 has an area X shown in FIG. 2 as its performance area, and performs a lead-in operation by moving from the rest position A above the disk 6 in the direction L opposite to the trace direction T during performance.
After reaching position B, which is slightly outside the outer edge of the 30cm LP disc, it rotates in the T direction toward a pre-specified song interval. The pick-up arm 5 rotates from rest position A to position B using two drive systems: a first drive system (hereinafter referred to as mechanical drive system) that mechanically drives the pick-up arm 5;
It is selectively driven by a second drive system (hereinafter referred to as DD drive system) that directly drives the pick-up arm 5 by electromagnetic force.

On the player housing side, there is an arm stopper 1a.
An arm stopper 4a is provided on the slide base 4 side, and when the slide base 4 is housed in the housing, the pick-up arm 5 is in contact with the arm stopper 1a (rest-in).
At this time, as will be described later (in FIG. 3), the pick-up plate 27 and the magnetic holder 28
Since the spring 30 is interposed between the pin member 12 and the pin member 12 fixed to the pick-up plate 27 and driven by the mechanical drive system 7, the pin member 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 1a and the pick-up arm 5 are separated, so that the pin member 12 is no longer pressed and the pick-up arm 5 rotates backward until it comes into contact with the arm stopper 4a. By doing this, the pick-up arm 5 does not get in the way when the disk is attached or detached, and the space factor during storage is improved.

3 and 4 are a schematic plan view showing the drive mechanism of the pick-up 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 pick-up arm 5, and a drive source. Rotating motor 9
and 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 rotary member 8;
The latch mechanism 11 is provided with a latch mechanism 11 provided on the rotating member 8, and the latch mechanism 11 selectively engages with a pin member 12 that interlocks with the pick-up arm 5 in accordance with the rotation of the rotating member 8, thereby resting the pick-up arm 5. From position A to position C near the center of the disk
It is driven in the first rotation range up to. The latch mechanism 11 rotates to guide a swinging arm 14 that is pivotably supported by a pin 13 implanted in the rotating member 8 and a guide pin 15 that is provided integrally with the swinging arm 14. A guide hole 16 formed in the member 8 and a spring member that engages with the swing arm 14 to position the swing arm 14 in the engagement position P or non-engagement position Q where the swing arm 14 can be engaged with the pin member 12 described above. 17, and when the swinging arm 14 is in the engagement position P, the pin member 12 is gripped in cooperation with the gripping member 18 provided on the rotational member 8, so that the pin member 12 is gripped in response to the rotation of the rotational member 8. The pick-up arm 5 is rotated, and when the pick-up arm 5 reaches a position C, it is reversed to a non-engaging position Q and disengaged from the pin member 12, thereby stopping the drive of the pick-up arm 5.

On the other hand, the DD drive system 19 includes, for example, a movable magnet provided on the pick-up arm side and a fixed coil provided on the arm stand side. The pick-up arm 5 is driven in the second rotation range. Movable magnet 2
0 is fixed to a rotating shaft (not shown) of a pick-up 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. Different magnetic poles are magnetized in the thickness direction so as to be arranged alternately in correspondence with a drive coil and a speed detection coil, which will be described later. On the other hand, a board 24 is attached to the arm stand 21 so as to be located between the magnet 20 and the yoke 23.
A pair of drive coils 25a and 25b that cooperate with the magnet 20 to rotate the pick-up arm 5 by electromagnetic force, and a speed detection coil 26 that detects the rotational speed of the pick-up arm 5 are fixed. A pair of drive coils 25a and 25b are arranged approximately around the central axis of rotation of the pick-up arm 5.
The speed detection coil 26 is arranged at a positional relationship of 180°.
are provided in a positional relationship of approximately 90 degrees with the drive coils 25a, 25b. Drive current is supplied to the drive coils 25a and 25b from a horizontal drive circuit, which will be described later, when the pick-up arm 5 reaches position D (as shown in the third figure), and when the pick-up arm 5 reaches position C, the drive system is supplied from the mechanical drive system 7. The drive is switched to the DD drive system 19, and the drive is performed by the DD drive system 19 in the second rotation range (position D to position B), and at the same time, the output of the speed detection coil 26 is fed back to the horizontal drive circuit to drive the pickup arm. 5 speed control is performed. In addition, mechanical drive system 7 to DD drive system 19
In order to ensure reliable switching, an overlapping portion (positions D to C) is provided in the first and second rotation ranges.

For example, a pick-up plate 27 is provided below the magnet 20 so as to be rotatable about the rotation axis of the pick-up arm 5, and this pick-up plate 27 has a long hole 27a formed therein.
The eccentric cam 29, which engages the magnetic holder 28 through the
It rotates as one. A spring 3 is installed between the pick-up plate 27 and the magnetic holder 28.
0 is interposed therebetween, and the aforementioned pin member 12 is fixed to the pick-up plate 27.

As shown in FIG. 5, the pick-up plate 27 is formed with a slit portion 31 consisting of a large number of slits in order to enable address setting corresponding to the rotational position of the pick-up arm 5. 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 pick-up plate 27 when the pick-up arm 5 is in the second rotation range (positions D to B in FIG. 3). . The A and B sensors 32a and 32b are used to constantly monitor the position of the needle tip of the pick-up arm 5 according to address, and the address B sensor is 90 degrees ahead of the address A sensor in phase. Furthermore,
The pickup arm 5 is positioned on the rotation locus of the shutter portion 33 of the pickup plate 27.
Detect the DD area (positions D to B in Figure 3)
A DD area sensor 34 and an end area sensor 35 for detecting the end area are provided. The output of the DD area sensor 34 is used to switch from the mechanical drive system 7 to the DD drive system 19 during lead-in operation. End area sensor 35
Address A and Address B during program play, normal full auto play, and manual play by the output of
Enables end detection based on each sensor output. These sensors 32a, 32b, 34 and 3
Reference numeral 5 is composed of a light emitting and light receiving element which are arranged to face each other with a pickup plate 27 in between, and are housed in a holder 36 attached to the arm stand 21 as shown in FIG.

In FIGS. 3 and 4, an elevation cam 37 of the pickup arm 5 is provided on the rotating member 8 of the mechanical drive system 7. As shown in FIGS. One end of an elevation shaft 38 held by the arm stand 21 so as to be movable up and down is in contact with the elevator cam 37, and the other end of the elevator shaft 38 is in contact with an elevation plate 39 that supports the pick-up arm 5. Fixed. A spring 50 is interposed between the arm stand 21 and one end of the elevation shaft 38 so that the elevation shaft 38
is biased 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 pick-up arm 5 due to the elevator operation.
A switch 44 is provided for detecting the rest position of the pick-up arm 5 (position A in FIG. 3). 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 also serves to detect the position immediately before the pickup arm 5 starts descending due to the elevator operation during the lead-in operation. That is, during the lead-in operation, the mechanical drive system 7 that precedes the rotation of the pick-up arm 5 by the DD drive system 19 in the second rotation range after the drive operation of the pick-up arm 5 is completed is activated by the lift completion detection switch 42. The robot is placed on standby just before the final stroke in which the elevator performs the elevator operation in response to the output of the controller. The rotating member 8 of the mechanical drive system 7 starts rotating again in order to lower the pick-up arm 5 in response to a descending command issued when the pick-up arm 5 reaches a desired music interval.

FIG. 6 shows a schematic perspective view of the pick-up arm assembly including the aforementioned DD drive system 19 and pick-up plate 27. A track interval sensor 46 is provided at its tip for distinguishing between a track interval and a sound groove by utilizing the difference in reflectance between the tracks. 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 consists of two light-receiving elements 50a and 50b, such as phototransistors, arranged along the rotating direction of the pick-up arm 5 so as to be symmetrical with respect to the vertical plane, and arranged as close to the needle tip 48 as possible. It is preferable to As shown in FIG. 8, the light-receiving element 50a precedes the light-receiving element 50b when the pick-up arm 5 rotates toward the outer circumference of the disk, and receives reflected light from the disk 6 based on the light emitted from the light-emitting element 49. It generates an output according to the amount of light received.
On the other hand, the light-receiving element 50b precedes the light-receiving element 50a when the pick-up arm 5 rotates toward the inner circumference of the disk, and similarly generates an output corresponding to the amount of light reflected from the disk 6 based on the light irradiated from the light-emitting element 49. do. The light-receiving elements 50a and 50b respectively generate outputs as shown in a and b in FIG. 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 section, and FIG. 11 is a circuit diagram showing a specific example of a part of FIG. In FIGS. 10 and 11, 51 is a system controller that centrally controls all of the blocks, and is comprised of, for example, a 4-bit microcomputer. The system controller 51 receives various command signals from the operating section 2, signals indicating the operating status of the system from the switch section 52, address signals from the address sensor section 53, inter-song signals from the inter-song sensor section 54, etc. applied. In response to these signals, the system controller 51 sends control signals to the DD drive system 19, dexynchronizer circuit 58, and the like.

The operation section 2 is provided with all the operation keys for program selection, command keys for commanding various operations, and light emitting diodes for displaying the operations of these keys. The arm drive unit 56 is an interface that drives the arm drive motor (rotary motor) 9 of the mechanical drive system 7 in response to a control signal from the system controller 51 and an output signal from the lowering completion detection switch 43. The loading drive unit 57 is the system controller 5
Slide base 4 in response to a control signal from 1
This is an interface that drives a loading motor 60 for moving the robot (FIG. 1). The digital synchro circuit 58 is an interface circuit for sending a recording synchro signal to a tape deck (not shown) selectively connected in response to a control signal from the system controller 51 when the synchro 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.
Put it in recording pause state and press synchro switch 6.
When 1 is turned on, the deck is in the recording state while the player is playing, and the deck is in the pause state when the player is in the elevation up state or the arm is moving, and the deck receives one pulse input to the pause terminal. It is designed to repeat the pause ← → recording (pause release) every time it is paused. The switch 52 includes switches 42 and 4 for detecting the completion of raising the pick-up arm 5 and the rest position.
4, switches 63 and 64 for detecting the closed state and open state of the player body.
Also provided.

Figure 12 shows the song interval sensor section 5 in Figure 10.
FIG. 4 is a circuit diagram showing a specific example of No. 4; In this figure,
The song interval sensor 46 includes a single light emitting element 49 and two light receiving elements 50a and 5 as explained in FIG.
The light receiving elements 50a and 50b each receive reflected light from the disk 6 and output an output according to the amount of received light. The two sensor outputs are amplified by an amplifier circuit 65 including operational amplifiers OP ₁ and OP ₂ and then 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. 13a. In FIG. 13a, A indicates a track interval, B indicates an introduction groove, and C indicates a lead-out groove. The differential amplifier circuit 66 has an operational amplifier OP ₃ which takes the two sensor outputs as inverting and non-inverting inputs, and differentially amplifies the two sensor outputs to obtain an output waveform as shown in FIG. 13b. There is. It is clear from FIG. 13b that the differential signal between songs has a substantially S-shaped curve.

The differential signal becomes each non-inverting input of an operational amplifier OP ₄ configuring the inter-track comparator 68 and an operational amplifier OP ₅ configuring the zero-cross comparator 69 .
A reference level V _TH is applied to the inverting input terminal of the operational amplifier OP ₄ , and the reference level V _TH changes according to the sensitivity selected by the sensitivity selector switch 70. Furthermore, even if the sensitivity is the same, the up of the pickup arm 5 , also changes depending on the down operation. This is the standard level even if the amount of light received by the light receiving elements 50a, 50b of the inter-track sensor 46 changes between up and down.
This is done in order to reliably discriminate between songs and tone grooves by changing V _TH , and by turning on and off the switch means 71 in accordance with the elevation operation of the pickup arm 5, the reference level V _TH is changed.
switching is performed. The output of operational amplifier OP ₄ is sent to the system controller 51 (first
Terminal 15) in Figure 1 is input.

The AC amplifier circuit 67 cuts the DC output of one sensor output of the amplifier circuit 65 using a capacitor C ₀ and amplifies the AC signal using an operational amplifier OP ₆ , and then supplies the result to the non-inverting input terminal of an operational amplifier OP ₇ that constitutes a search comparator 90 . . In the zero cross comparator 69, the operational amplifier _OP5 has the fixed reference voltage _B2 as an inverting input, detects the zero cross point of the differential signal from the differential amplifier circuit 66, and outputs a zero cross signal. On the other hand, the operational amplifier OP ₇ of the search comparator 90 has the same reference level as the operational amplifier OP ₄ .
It has V _TH as an inverting input, receives a signal from the AC amplifier circuit 67, and outputs a signal that is cut off from the reference level V _TH as an inter-song registration permission signal. The zero cross signal and the song interval registration permission signal are input to the gate circuit 72, and the system controller 51 (11th
Based on the mute signal output from terminal 2) in the figure, a zero-cross signal is input to the system controller 51 (terminal 14 in FIG. 11) when the pick-up arm 5 is down, and a song interval registration permission signal when it is up. The system controller 51 detects the center between songs during performance based on the zero-cross signal and the inter-song signal. Incidentally, the above-mentioned on/off operation of the switch means 71 is performed based on the above-mentioned mute signal.

FIG. 14 is a circuit diagram showing a specific example of the DD drive system 19 in FIG. 10. The DD drive system 19 is
Drive coils 25a and 25b connected in series,
It is comprised of a horizontal drive circuit 73 that supplies a drive current to this drive coil, a speed detection coil 26, and an amplifier circuit 74 that amplifies the minute detection voltage of this detection coil. The horizontal drive circuit 73 includes a differential amplifier 75 consisting of an operational amplifier _OP8 and an operational amplifier.
The operational amplifier OP ₈ is composed of an inverter 76 with a gain of 1, and the inverting input terminal of the operational amplifier OP ₈ receives the band servo signal from the inter-track sensor section 54, and the non-inverting input terminal receives the speed detection signal amplified by the amplifier circuit 74. A speed servo signal from the coil 26 is applied, and the difference between the two with respect to the reference voltage is amplified to drive the drive coil 25.
By supplying current to a and 25, the pick-up arm 5 is driven while controlling its speed. The band servo signal and the speed servo signal are sent to the differential amplifier 75 by switch means 77 and 78 which are turned on and off according to control from the system controller 51, respectively.
Supplied as needed. The amplifier circuit 74 includes an operational amplifier OP ₁₀ , which amplifies the minute amount of power generated by the speed detection coil 26 according to the rotational speed of the pickup arm 5, and outputs it to the horizontal drive circuit 73 as a speed servo signal. In the amplifier circuit 74, _VR1 is a volume for offset adjustment.

Here, the band servo operation will be explained.
As explained based on FIG. 13b, the differential output of the differential amplifier circuit 66 in the song interval sensor section 54 exhibits an S-curve characteristic as shown in FIG. 15 with respect to the song interval, and this differential output becomes the band servo signal. If the needle tip 48 is now moved to the outer circumference by X (mm) with respect to the center of the song, a band servo signal of V (v) is generated. In response to this signal, the horizontal drive circuit 73
A current is supplied to the drive coils 25a and 25b, and the needle tip 48 moves in the inner circumferential direction until it is located above the center of the song. Controlling the needle tip 48 in this way so that it is always positioned above the center of the song is called band servo. The band servo operation is controlled so that it starts when the pick-up arm 5 reaches the top of the song interval during program play and ends when the down is completed.

When the pick-up arm 5 is operated by the system controller 51 based on commands such as start and stop from the operation section 2 and other program plays, the drive voltage generation circuit 79 (11th
The drive voltage generated by the system controller 51 is applied to the inverting input terminal of the operational amplifier _OP8 , and the drive voltage generated by the
The moving speed and direction of the pick-up arm 5 can be controlled by changing the value and polarity of the drive voltage with respect to the reference voltage based on the control signals output from 7 and 28 indicating high-speed, inner circumferential direction and outer circumferential direction drive. .

In FIG. 14, a cancel coil 80 is integrally provided with the drive coil 25b and is connected in series with the speed detection coil 26. This cancel coil 80 increases the S/N of the output of the speed detection coil 26 by canceling noise components generated by the drive coils 25a and 25b.
This is to improve 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 the speed detection coil 26
An alternating current flows through the motor and becomes a noise component, but by providing the cancel coil 80 in series with the speed detection coil 26, the alternating current component can be canceled.
A variable resistor VR ₂ is connected in parallel to the cancel coil 80, and the cancel coil 80 has a configuration in which the amount of cancel can be varied by the variable resistor VR ₂ .

FIG. 16 is a circuit diagram showing a specific example of the address sensor section 53 in FIG. 10, which includes a light emitting section 53A having four light emitting diodes and a light receiving section having four phototransistors arranged opposite to these light emitting diodes. Address A, B by 53B
Sensors 32a, 32b, DD area sensor 3
4 and an end area sensor 35, and a pick-up plate 27, which is interlocked with the pick-up arm 5, rotates through the gap between the light emitting section 53A and the light receiving section 53B. Each output from the light receiving section 53B is sent to inverters 82 to 85 that constitute the waveform shaping circuit 81.
The signal is waveform-shaped and output 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 the terminal 10 of the system controller 51 at address A.
Signal b is connected to terminal 12, address B signal c is connected to terminal 13
, the DD area signal d is applied to the terminal 11, respectively. The role of each sensor is as explained in FIG.

Next, the operation of the above-described configuration will be explained.

First, Figure 18A and 18 show the operation when playing a program by specifying the 3rd track → 1st track on a 30cmLP disc.
This will be explained based on the timing chart in Figure B.
It is assumed that the disc 6 has already been set, the player body is in the closed state, and the pick-up 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 panel 2, and the light emitting diode (hereinafter referred to as
(abbreviated as LED) "3" (u) lights up (in reality, it blinks once and then lights up), indicating that the third song has been programmed. Next, when the song selection key "1" is turned on, the LED "1" (v) lights up in the same way. If you make a mistake in setting the program, turning on the stop key will clear the program, 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 goes to L level, and the rotary motor 9 (j) of the mechanical drive system 7 starts rotating in the arm lead-in direction. , start auto lead-in. At this time, the LED “start” (w)
lights up to indicate the start of auto lead-in, and at the same time, the rest position detection switch 44(a) is reversed.

Pickup arm 5 continues the lead-in,
At the time _t3 when the needle tip 48 reaches the vicinity of the center spindle (near the center of the disk), the output (o) of the DD area sensor 34 is inputted to the terminal 11 of the system controller 51 at H level, and in response, the output (o) of the DD area sensor 34 is inputted to the terminal 11 of the system controller 51. k) and 28(m) each become L level, operating the DD drive system 19, and from here
Enters the DD drive range. 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 pick-up arm 5 is disconnected from the mechanical drive system 7.
Switches to 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, and the cam portion 8a of the rotating member 8
turns off the rise completion detection switch 42, the output (f) of this switch 42 is inputted to the terminal 39 at H level, and in response, terminal 8 (h) goes to H level and terminal 9 (j) goes to L level. , the rotating motor 9(j) is reversed in the lead-out direction, and when the ascent completion detection switch 42 is turned on again, terminals 8(h) and 9(j) become H level, and the rotating motor (j) is turned on. Stop and raise completion detection switch 42
Waits in the on state.

While the high-speed lead-in operation by the DD drive system 19 continues, in the system controller 51, the address A sensor 32a (p) and B sensor 3 input to the terminals 12 and 13 from time _t2 .
Address counting is started based on the pulse signal from 2b(q), and a search is started from time _t4 when a predetermined address is reached to register between songs. Then, when the pick-up arm 5 is raised (during search), the song interval signal (s) is inputted from the song interval sensor section 54 to the terminal 14 and inputted to the terminal 15 in response to the song interval registration permission signal (r). Addresses are registered sequentially from between songs on the innermost circumference of the disc. Pick up arm 5 is 30
A final disk size determination is performed at time _t5 when the search end address outside the outer edge of the cmLP disk is reached.

Size determination is performed by adding, for example, 3 to the address indicating the drop position corresponding to the disc size of 17 cm, 25 cm, and 30 cm, and the address of the last registered song (the outermost song) registered between songs at the time of search. This is done by sequential comparison as shown in the flowchart of FIG. 19, and if the relationship of last registered song address≦drop position address+3 is established, the actual dice size is determined from the drop position at that time. In addition, the address between each song near the last registered song registered between songs during the search is compared with the value of the descending address -5 (address 5 before the descending position) determined by the size, and each song near the last registered song is compared. If the relationship of address≧descending address-5 is established, the registered song is also modified such that the song is not considered as a song and is deleted.

After the size determination is completed, the system controller 51
Terminal 27(l) becomes L level, terminal 28(m) becomes H level (terminal 26 remains L level),
The driving direction of the DD drive system 19 is reversed, whereby the pick-up arm 5 moves at high speed toward the third song, which is the first program song, and begins an operation for detecting the third song. At this time (time _t5 ), the terminal (d) becomes L level at the same time, activating the phono motor 55 and rotating the turntable 3(e). Further, the LED "3" (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 in FIG. 20, the needle tip 48 of the pick-up arm 5, which moves at high speed in the direction of the inner circumference of the disk, reaches the address 4, for example, just before the registered address of the third song (registered address +
4) (time t ₆ ), the terminal (k) becomes H level and the moving speed of the arm becomes low. Then, in the low-speed driving state, the song interval is detected from before the third song, and when the song interval signal (s) from the song interval sensor section 54 is input to the terminal 15, the system controller 51 detects the rising edge of the pulse ( time _t7 )
, and set the terminal 27(l) to H level to DD
At the same time as stopping the drive system 19, the LEDs "start" (w) and "up" that had been lit up until then turned off.
Turn off (y). At the same time, the terminal 8(h) is set to the 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 elevator down operation. At this time, terminal 3
(c) also goes to L level and transistor Q ₂ (11th
By setting the collector of the switch means 77 (10th and 14th shown) to the H level, the band servo is turned on, and the band servo signal from the song interval sensor section 54 (the output of the two song sensors) is turned on. DD drive system 19
The pick-up arm 5 is driven in a horizontal plane. With this band servo, even if the disk is eccentric, it is possible to follow the deviation between songs as the disk rotates, and lower the needle tip 48 of the pickup arm 5 to position it at the center of the song.

The elevator down operation continues, and at time _t8 , the cam portion 8a (shown in the third figure) of the rotating member 8 turns on the descent completion detection switch 43, and when its output (g) goes to the L level, the terminal 9(i) also goes to the L level. Then, the rotary motor (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, terminal 3
(c) transitions to H level, turning on the transistor _Q2 , thereby making the switch means 77 non-conductive and turning off the band servo. Furthermore, the muting signal (b) output from terminal 2 disappears (becomes L level), and the output of buffer 86 also becomes L level, turning off transistor Q ₂ configuring muting circuit 87, thereby turning off muting relay 88. Turn off and enter playing mode. Due to the transition of the mute signal (b) to the L level, the transistor Q ₂ in the inter-song sensor section 54 (see FIG. 12) is turned off, so that the switch means 71 becomes conductive, and the reference level of the operational amplifier circuits OP ₄ and OP ₇ is turned off. By switching V _TH , the inter-track sensor section 5
Set the sensitivity up/down switch in step 4 to down.
Further, due to the transition of the mute signal (d) to the L level, the output of the buffer 89 also goes to the L level, making the switch means 78 (shown in Figures 10 and 14) non-conducting, thereby causing the speed detection coil 26 in the DD drive system 19 to be switched to the horizontal drive circuit. The speed servo signal to 73 is cut off to turn off the speed servo. At the same time Batsuhua 89
When the output of the drive voltage generating circuit 79 (shown in FIG. 11) becomes L level, the resistances R ₁ , R ₂ ,
The voltage balance between the inverting input terminal and the non-inverting input terminal of the differential amplifier 75 (shown in FIG. 14) of the DD drive system 19 is slightly disturbed through _R3 and the diode _D1 to provide an anti-skating amount during performance.

When detecting a gap between songs, if a gap between songs is not found, the search is performed further, for example, at the 1st address (registered address -1) from the registered address of the 3rd song, and when a gap is detected, the pick-up arm 5 is moved as described above. It is controlled to stop and move to an elevation down operation. If the song interval is not found even after searching the back of address 1, move the pick-up arm 5 toward the outer circumference at high speed, and when it reaches the address (registered address + 4), reverse the moving direction of the pick-up arm 5. The song interval detection operation similar to that described above is repeated by moving in the inner circumferential direction at a low speed. If the song interval detection operation is repeated a predetermined number of times, for example four times, but the song interval cannot be detected, the process moves to the next program song selection operation.

When the third song is played, and slightly before the end of the performance, for example, at address 2 before the registered address of the fourth song, the system controller 51 connects the terminal 14,
Zero cross signal (r), inter-song signal (s) at 15
will be in a waiting state for input. In this state, the H level zero cross signal (r) is input to the terminal 14 of the system controller 51, and the zero cross signal (r) 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 determines that the needle tip
It is detected that an interval has come between the songs (time point r ₉ ).
At time t ₉ when the end of the third song is detected, an H-level muting signal (b) is output from terminal 2, turning on transistor Q ₂ , turning on muting relay 88 and cutting off the audio signal system. . At the same time, the sensitivity of the song interval sensor section 54 is switched up and the speed servo of the DD drive system 19 is turned on. At this time, the LED "up" (y) lights up,
The LED "1" (v) that was lit flashes until the end of the first song. Further, the terminal 8(h) is set to H level to rotate the rotary motor 9(j) of the mechanical drive system 7 in the upward direction, thereby starting the elevation up operation. At this time, the rotating member 8 rotates to turn off the descent completion detection switch 43(g).

When the rotating member 8 continues to rotate and the ascent completion detection switch 42 (f) is turned on (time t ₁₀ ), the terminal 9
(i) becomes 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 L level, the mechanical drive system 7 operates, and the pick up arm 5 starts the first song. It moves at high speed toward the outer periphery. When the pick-up arm 5 passes between the first songs (30cm lowered position) and arrives at the place where it has passed address 4 from the registered address of the first song (outside the outer edge of the disk) (at the time
t ₁₁ ), the terminal 26 of the system controller 51 is H.
The terminal 27 becomes the L level and the terminal 28 becomes the H level, and the DD drive system 19 reverses the drive 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 performance of the first song begins through the same process as when playing the third 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 lowering position address that corresponds to each disk size that has been set in advance.

In the same manner as in the case of the third song, the end of the performance of the first song is detected (time _t13 ), and the elevation up operation is completed. All programs have finished, so
Time T ₁₄ when the ascent completion detection switch 42 is turned on
Then, the terminal 8 of the system controller 51 is kept at the H level and the terminal 9 is kept at the L level, and the rotary motor 9 of the mechanical drive system 7 continues to rotate in the lead-out direction.
Using this as a driving source, the pick-up arm 5 moves at high speed in the rest direction (auto return). At the same time, the rotation of the turntable 3 also stops. At time _t15 when the pick-up arm 5 reaches the rest position and the rest position detection switch 44 is turned on, the terminal 9 of the system controller 51 becomes H level, the rotary motor 9 of the mechanical drive system 7 stops, and the pick-up arm 5 It enters a standby state at the rest position and ends the program performance.

Next, operations during performance by manual operation will be explained based on timing charts shown in FIGS. 21A and 21B. It is assumed that the loading section is initially in the closed state, and when the "open/close" key is turned on at time _t1 , the terminal 6 of the system controller 51 goes to the L level, the loading motor 60 begins to rotate in the open direction, and the slide The base 4 protrudes toward the front as shown in FIG. 1b. Continue the open operation and slide base 4
turns on the open detection switch 64e at time _t2 , the terminal 6 of the system controller 51 changes to H level, the loading motor 60 is stopped, and the open operation is completed. 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 _t1 , the motor automatically stops and stands by at that point (Fuel Safe).

Place the disc on turntable 3 and set the time
When the "arm manual set" key is turned on at _t3 , terminal 19(t) of the system controller 51
becomes L level, and in response, terminal 8(j)
becomes L level, and the rotary motor 9 of the mechanical drive system 7
(l) starts rotating in the lead-in direction, and the pick-up arm 5 starts leading-in. At this time, the terminal 4(c) of the system controller 51 also becomes L level, causing the phono motor 55 to rotate. From then on, the pick-up arm 5 continues the lead-in in the same way as the automatic lead-in when playing a program, and the DD
At the time t ₂ when the output (g) of the area sensor 34 is generated, the terminals 26 (m) and 28 (o) of the system controller 51 each become L level, and the DD drive system 19 is operated, and the drive system is changed to the mechanical drive system 7. from
Switch to DD drive system 19. Mechanical drive system 7 is DD
It precedes the drive system 19 and stands by just before the elevator down operation. The pick-up arm 5 continues the lead-in at high speed, and the address A sensor 32a
At time _t5 when the rising edge of the 103rd pulse of the output (r) is input to the terminal 12 of the system controller 51, the terminal 26 (m) becomes H level,
The moving speed of the pick-up arm 5 becomes low.

The pick-up arm 5 continues to 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 of the system controller 51
(o) becomes H level, the DD drive system 19 stops, the pick-up arm 5 stops in the raised state, and enters a 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 (l) of the mechanical drive system 7 rotates in the down direction and starts the elevator down operation.
At this time, the LED "Atsupu" that had been lit up until then
(w) 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 goes to L level. As a result, the mechanical drive system 7 stops. At this time, the mute signal (b) that was output from terminal 2 at the same time
disappears (becomes L level), the muting relay 88 is turned off, and a performance state is entered.

During performance, if you keep pressing the "Start" key at time _t9 , you will move to the locate-in operation. First, time t ₉
Terminal 8(j) of the system controller 51 becomes H.
level, the rotation motor 9 of the mechanical drive system 7
(l) rotates in the up direction and enters the elevation up operation. At the same time LED "start" (v)
and “UP” (w) lights up, and H is connected from terminal 2.
A level muting signal (b) is output, turning on the muting relay 88 and interrupting the performance.
When the ascent completion detection switch 42 (h) is turned on (time t ₁₀ ), the terminal 9 of the system controller 51
(k) becomes H level, the rotation motor 9(l) of the mechanical drive system 7 is stopped, and the ascent is completed.
Next, the terminal 27(n) becomes L level, the DD drive system 19 is operated, and the pick-up arm 5 is moved in the inner circumferential direction at a 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 held down and released at an arbitrary position (time _t11 ), the terminal 27(n) of the system controller 51 becomes H level and the DD drive system 19 stops, so the pick-up arm 5 is in the raised state. It will stop and at the same time the LED "Start" will stop blinking. When the "elevation" key is turned on (time _t12 ), the instrument goes through an elevation down operation in the same manner as the manual lead-in, and enters the performance state at time _t13 .

In addition, when performing a locate operation, please press the "Stop" button.
If you keep pressing the key, after the elevation up operation is completed, terminal 2 of the system controller 51 is
8(o) becomes the L level, and the pick-up arm 5 moves toward the outer periphery at low speed (locate out). Also, regardless of whether it is up or down,
When the pick-up arm 5 exceeds the DD drive range, the mechanical drive system 7 operates to automatically return the pick-up 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 needle tip 48 reaches the vicinity of the lead-out groove, the output (p) of the end area sensor 35 is at the L level and the terminal 10 of the system controller 51 is reached.
address A, address B sensors 32a, 3
Based on the outputs (r) and (s) of the needle 2b, end detection is performed when the needle tip 48 enters the lead-out groove and the feeding speed increases. At time _t14 when the end is detected, terminal 8(j) of the system controller 51 becomes H level (terminal 9 remains at L level), and the elevation up operation is started. At this time, the LED "UP" (w) lights up, and the muting signal (b) is output, turning on the muting relay 88 and cutting off the audio signal system. Even if the raising completion detection switch 42 (h) is turned on (time t ₁₅ ) and the raising operation is completed, the terminal 8 of the system controller 51,
9 is maintained, and the mechanical drive system 7 causes the pick-up arm 5 to start auto-returning in the rest direction. At the time _t16 when the pick-up arm 5 returns to the rest position, the rest position detection switch 44
(a) is turned on, and at time _t17 when a predetermined time has elapsed from time _t16 , terminal 9(k) of the system controller 51 is turned on.
becomes H level, stops the mechanical drive system 7, and completes the auto return. 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 , terminal 7 of the system controller 51
(g) becomes L level, and in response, the loading motor 60 rotates in the closing direction and drives the slide base 4 to be housed in the main body. When storage is completed and the slide base turns on the close detection switch 63(d) (time _t19 ), the system controller 51 responds to this by turning on the terminal 7.
(g) is set to H level, and the loading motor 60
is stopped, the closing is completed, and all operations are in a standby state.

In program performance and manual performance,
When performing so-called de-syncing, in which the playback sound is automatically recorded onto a tape deck (not shown), first connect the synchro output terminal 62 (shown in the 11th diagram) of this system to the remote pause terminal of the tape deck, and then is in a recording pause state, and the synchronization switch 61 of the system is turned on. From the terminal 25 of the system controller 51, as shown in FIG. 18B, when the program is played, time points _t7 , t10 _{, t10} ,
L level synchro output (t) at t ₁₂ and t ₁₄
occurs. Because Detsuki repeats pause←→recording every time one pulse is input to the pause input, the pause is released only during performance, and only the playback sound can be recorded automatically. During manual performance, the 21st B
As shown in the figure, synchro output (u) is generated at time points _t7 , _t10 , _t12, and _t15 , and the recording state is automatically entered only during performance.

In the above embodiment, the case where the present invention was applied to an offset arm was explained, but the present invention can also be applied to a linear tracking arm.

As described above, in the present invention, during the lead-in operation of the pick-up arm equipped with the address sensor and the song interval sensor that detect the arm position, the output of the address sensor is searched based on the output of the song interval sensor. The address is set based on the address and the song interval is registered, and during song selection operation, the vicinity of the specified address is detected by an address search based on the output of the address sensor, and from the time of detection, the song interval is detected based on the output of the song interval sensor. After detecting the song interval, the band servo controls the descending position of the pick-up arm based on the position error signal output from the center of the song generated from each output of the pair of song interval sensors, and furthermore, the position is controlled during tracing. Based on the output of the error signal, the song interval is detected and the pick-up arm is raised.This allows the specified song interval to be detected reliably, and even if the disc is eccentric or warped, the stylus tip can be moved between the songs. The pick-up arm can be lowered correctly, and furthermore, the pick-up arm can be raised accurately between songs during tracing.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the record player according to the present invention, in which a shows the closed state and b shows the open state, FIG. 2 is a plan view showing the operating area of the pick-up arm, and FIGS. The figure is a schematic plan view showing the drive mechanism of the pick-up arm and a perspective view of each part before assembly, Figure 5 is a plan view showing the positional relationship between the pick-up plate and the address sensor section, and Figure 6 is a schematic diagram showing the pick-up arm assembly. 7 is a schematic perspective view showing the head shell section, FIG. 8 is a diagram showing the positional relationship between the song interval sensor and the song interval, and FIG. 9 is a diagram showing the output characteristics of the song interval sensor during the song interval. FIG. 10 is a block diagram showing an example of the control section, FIG. 11 is a circuit diagram showing a specific example of a part of FIG. 10, FIG. 12 is a circuit diagram showing a specific example of the inter-song sensor section, and FIG. The waveform diagram of each part in Fig. 12, and Fig. 14 is the DD drive system 19.
15 is a circuit diagram showing a specific example of the band servo, FIG. 16 is a circuit diagram showing a specific example of the address sensor section, and FIG. 17 is a diagram showing the relationship between songs and band servo signals. FIGS. 18A and 18B are timing chart diagrams showing the outputs of each sensor in FIG. 21A and 21B are flowcharts for explaining the operation of detecting between songs, and FIGS. 21A and 21B are timing charts for explaining the operation during manual performance. Explanation of symbols of main parts, 2... Operation section, 5...
Pickup arm, 7... Mechanical drive system, 8...
Rotating member, 9... Rotating motor, 11... Latch mechanism, 19... DD drive system, 20... Magnet,
25a, 25b... Drive coil, 26... Speed detection coil, 27... Pick up plate, 32
a, 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 unit, 60...Loading motor, 70...Sensitivity changeover switch, 71, 77, 78...Switch means, 79...Drive voltage generation circuit, 80...Cancel coil, 87 ...Muuting circuit.

Claims (1)

[Claims] 1. During the lead-in operation of a pick-up arm equipped with an address sensor for detecting arm position and a song interval sensor, an address is set based on the output of the address sensor while searching for a song interval based on the output of the song interval sensor. registering a song interval, and during a song selection operation, detecting the vicinity of the designated address by an address search based on the output of the address sensor, and detecting the song interval based on the output of the song interval sensor from the time of detection,
After the song interval is detected, the descending position of the pickup arm is controlled based on the position error signal output from the center of the song generated from each output of the pair of song interval sensors, and furthermore, during tracing, the position error signal output is controlled. 1. A method for driving a pick-up arm, characterized in that the pick-up arm is raised by detecting an interval between songs based on the above-mentioned information.