JPS58122672A - Driving method of pickup arm - Google Patents

Abstract

PURPOSE:To continue the drive control of an arm surely, by restoring the arm to a rest position forcedly with a mechanism drive system, if the pickup arm is jumped out to the outside of the driving range of an electromagnetic driving system. CONSTITUTION:In starting the pickup arm at the rest position A with an operation button of a CPU (not shown) after the designation of a recording, the arm is turned with a mechanism drive system 7 to a position C, and the electromagnetic force DD drives the arm from a position D to a B. At the DD drive, a photocoupler at the tip of the arm 5 is activated and every time the inter- music is detected, a position sensor interlocked with the arm gives an address to the inter-music and the address is stored in the CPU. In detecting the size of the disc, the DD drive is reversed, the designated address is searched and the arm is fallen down. When a position sensor detects that the arm 5 is at the outside of the region of the DD driving system due to any cause, the arm 5 is restored to the rest position A forcedly for lead-in again. Thus, the driving of the arm is controlled surely.

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 an automatic record player.

The purpose is to provide a method for driving a pickup arm that can reliably control the pickup arm.

1 method for driving the pickup arm according to the present invention 1.1;
In Reni 1-1 to 7 layers, which are equipped with a first drive system that mechanically drives the Bic 77 I-arm and a second drive system that directly drives the pickup arm (by electromagnetic force), the pickup arm When the pick arm is located outside the drive range of the second drive system, the first drive system forces the pick arm to return to the position.

Hereinafter, 61 examples of the present invention will be described using the drawings.
Explain.

FIG. 1 is a schematic perspective view of a record player according to the present invention, with (a) showing the closed position and (b) showing the A-open state. There is. As shown in FIG. 1, according to the present invention]-1~
Play) 711 has a so-called font []-taing configuration in which a disc (not shown) can be set from the front of the main body. In other words, when the open, 'cl;, and ose keys 2a provided on the operation section 2 on the front of the main body are pressed, the slide base 4 on which the turntable 3 is mounted moves forward and protrudes toward the front of the main body. A-Bun state>,
After placing the disc on the turntable 3 in this open state, by pressing 0pen/close:>-2a again, the slide base 4 is moved back to the closed state and the disc is set. Also,
In the closed state (a), fully automatic performance by D-gram music selection is possible, and in the open state (b), performance can be performed manually. Note that although the door that should be provided on the front of the main body is not shown, the door is also connected to the oven 1. ``Closing operation: Opening and closing operations are performed in conjunction with the slide base 4.

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 a playing area X shown in FIG.
Perform the lead-in operation by rotating in the opposite direction to position B, which is slightly outside the outer edge of the 30CIILP disc.
After reaching the specified position, move upwards during the specified song. K WJ 42 drive systems, namely, a first drive system (hereinafter referred to as mechanical drive system) that mechanically drives the pickup arm 5, and a second drive system that directly drives the pickup arm 5 by electromagnetic power 1.
J is selectively driven by the drive system (hereinafter referred to as DD drive system).

An arm stopper 1 ;) is installed on the play body side, and an arm stopper 4a is installed on the slide base 4 side, and when the slide base 4 is stored in the lock body, the pickup arm 5 is installed with a 7/-mus stopper. 18
(rest in).

At this time, as will be described later (C in FIG. 3), since a spring 30 is interposed between the pick-up/solate 27 and the magnetic halter 28, the pick-up/solate 27 and the magnetic halter 28 are fixed to the pick-up/solate 27 and the mechanical drive system 7. The bottle member 12 driven by resists the biasing force of the spring 30
The timing is right when I is pressed.

Then, when the slide base 4 moves forward, No. 1-
Since the must stopper 18 and the pickup arm 5 are spaced apart, the bottle member 12 is no longer pressed, and the pickup arm 5 rotates backward until it comes into contact with the arm stopper 48. By doing this, the pickup arm 5 does not get in the way when the disc is removed, and the space factor during storage 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 1o that transmits the driving force of the rotary motor 9 to the rotary member 8 using a combination of gears;
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 the bin member 12 that interlocks with the pickup arm 5 in accordance with the rotation of the rotating member 8, thereby resting the pickup arm 5. The drive is performed in a first rotation range from position C to position C 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;
Guide bin 1 provided integrally with this swing arm 14
5, and a guide hole 16 formed in the rotating member 8 to guide the swinging arm 14 to the engagement position P or non-engagement position Q where the swinging arm 14 can be secured to the bottle member 12 described above. When the swinging arm 14 is in the engagement position IFP, it cooperates with a gripping member 18 provided on the rotational member 8 to grip the bottle member 12, so that the rotational member 8 The pickup arm 5 is rotated according to the rotation of the pickup arm 5, and when the pickup arm 5 reaches the position C, it is reversed to the non-engaging position Q and disengaged from the bin member 12, thereby driving the pickup arm 5. Stop.

On the other hand, the DD drive system 19 includes, for example, a movable magnet provided on the pickup arm side and a fixed coil provided on the arm stand side. The pickup arm 5 is driven in the second rotation range up to wIB. The movable magnet 20 is attached to a pickup arm 5 rotatably held by a bearing 22 of an arm stand 21.
The yoke 23 is fixed to a rotating shaft (not shown) so as to face the yoke 23 at a predetermined distance from each other, and the magnetic poles arranged in the circumferential direction are arranged alternately in correspondence with a drive coil and a speed detection coil, which will be described later. They are magnetized in the thickness direction so that they line up.

On the other hand, a board 24 is attached to the arm stand 21 so as to be in the same position as the magnet 20 and the yoke 23, and the board 24 has a board 24 that rotates the pickup arm 5 by an electric power 1iit3 in cooperation with the magnet 20. A pair of drive coils 25a, 25b and a speed detection coil 26 for detecting the rotational speed of the pickup arm 5 are fixed. The pair of drive coils 25a and 25b are arranged at a positional relationship of approximately 1800 degrees around the rotation center axis of the pickup arm 5, and the speed detection coil 26 is connected to the drive filter 25.
A and 25b are provided with a positional distance of about 90". When the pickup arm 5 reaches position 1fD (shown in the third figure), a drive current is applied to the drive coils 25a and 25b from a horizontal drive circuit to be described later. When the position wC is reached, the drive system is switched from the mechanical drive system 7 to the DD drive system 19, and the DD drive system 19 is driven in the second rotation range (position [D to position 11B). , at the same time the speed detection coil 26
The output is fed back to the horizontal drive circuit to control the speed l1lI of the pickup arm 5. In order to ensure the switching from the mechanical drive system 7 to the DD drive system 19, an overlap portion (position D-C) is 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 to be rotatable about the rotation axis of the magnet holder 2 through a long hole 27a formed in the pickup plate 27.
The pickup arm 5 is
It is attached to the magnet holder 28 so that its position can be adjusted in a horizontal plane with respect 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 bottle 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 movement 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 1FD 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 pickup arm 5 according to the address, and the address B sensor is 90 degrees ahead of the address A sensor in phase. Furthermore, the DD area of the pickup arm 5 (position D-8 in FIG. 3) is located on the rotation locus of the shutter portion 33 of the pickup plate 27.
A DD area sensor 34 for detecting the end area and an end area sensor 35 for detecting the end area are provided.

The output of the DD area sensor 34 causes switching from the mechanical drive system 7 to the DD drive system 19 during lead-in operation. The output of the end area sensor 35 allows the program performance 9 to be performed properly in full auto mode.

To enable end detection based on each output of an address A0 address 8 sensor during manual performance. These sensors 32a, 32b, 34 and 35 are comprised of light emitting and light receiving elements disposed opposite to each other with the 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, 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 held movably up and down 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 an elevation plate 39 that supports the pickup arm 5. Fixed. 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. Mechanical chassis 4 equipped with mechanical drive system 7
1, there are switches 42 and 43 for detecting the completion of raising and lowering the pickup arm 5 due to the elevation operation, and a switch for detecting the rest position of the pickup arm 5 (position wA in FIG. 3). 44 are 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. In other words, 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 DO drive system 19 in the second rotation range after the drive operation of A special machine is used just before the final stage. 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 a desired song interval.

FIG. 6 shows a schematic perspective view of a pickup arm assembly including the aforementioned DD drive system 19 and pick door knob plate 27, and the head shell 45 attached to the tip of the pickup arm 5 has a sound groove on a record A song interval sensor 46 is provided at its tip for distinguishing between a song gap and a sound groove by utilizing the difference in reflectivity 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, which are 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 precedes the light-receiving element 50b when the pickup 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 pickup arm 5 moves toward the inner circumference of the disk, and similarly generates an output according to the amount of light reflected from the disk 6 based on the irradiated light from the light-emitting element 49. do. The light-receiving elements 50a and 50b are arranged at (a) in FIG.
') and (b), and when the stylus tip 48 of the cartridge 47 is located on the center of the song, the outputs (a) and (b) are as shown in Figure 9 with respect to the center of the song. The relationship is shown in .

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 portion of FIG. 10th
In the figure and FIG. 11, 51 is a system controller that centrally controls all 10 units.
For example, it consists of a 4-pit microcomputer. The system controller 51 receives various command signals from the operation section 2, signals indicating the operating state of the system from the switch section 52, address signals from the 1st address sensor part 53, and inter-song signals from the song-interval sensor part 54. etc. are 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 operates the arm drive motor (
This is an interface that drives the rotary motor (rotary motor) 9. The loading drive unit 57 is an interface that drives a loading motor 60 for moving the slide base 4 (FIG. 1) in response to a control signal from the system controller 51. The digital synchro circuit 58 is an interface circuit for sending a recording synchro signal to a tape deck (not shown) that is 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, 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 m-interval sensor part 54 in FIG. 10. Book,! ! 1, the inter-track sensor 46 consists of a single light-emitting element 49 and two light-receiving elements 50a and 50b, as explained in FIG. Generates output according to the amount of light received. The two sensor outputs are amplified by an amplifier circuit 65 including operational amplifiers OPI and OP2 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. 13(a). Figure 13 (a
), (a) shows the song interval, (b) shows the lead-in groove, and (c) shows the lead-out groove.

Differential amplifier circuit 66 inverts the two sensor outputs.

It has an operational amplifier OPa having a non-inverting input, and differentially amplifies the two sensor outputs to obtain 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 is operationally amplified @ which constitutes the inter-song comparator 68.
It becomes each non-inverting input of operational amplifier OPs which constitutes OP4 and zero cross comparator 69. Operational amplification 11
A reference level VTI-1 is applied to the inverting input terminal of OP a, and the reference level VTH is applied to the sensitivity selector switch 7.
It changes according to the sensitivity selected by 0, and also changes according to the up and down movements of the pickup arm 5 even if the sensitivity is the same.

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 VTH is switched. The output of the operational amplifier OPa is input to the system controller 51 (terminal 15 in FIG. 11) as a bend signal.

The AC amplifier circuit 67 cuts DC from one sensor output of the amplifier circuit 65 with a capacitor Co, and performs operational amplification 10P.
After being AC amplified in step 6, the signal is supplied to the non-inverting input terminal of operational amplifier 10Py constituting search comparator 90.

At the zero cross comparator 69, the operational amplifier OP
s has the fixed reference voltage B2 as an inverting input, detects the zero-crossing point of the differential signal from the differential amplifier circuit 66, and outputs a zero-crossing signal. On the other hand, the operational amplifier OP7 of the search comparator 90 has the same reference level VTI-1 as the inverted input as the operational amplifier OP4, and receives the signal from the AC amplifier circuit 67 and uses the signal cut off the reference level VTH as a song me recording permission signal. Output. The zero-crossing signal and the inter-song registration permission signal are input to the gate circuit 72, and based on the mute signal output from the system controller 51 (terminal 2 in FIG. 11), the zero-crossing signal is turned up when the pickup arm 5 is down. At this time, a song interval registration permission signal is input to the system controller 51 (terminal 14 in FIG. 11). In the system controller 51, the center of the song being played is detected based on the zero cross signal and the song part 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 DO drive system 19 in FIG. 10. The DD 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, a speed detection coil 26, and an amplifier that amplifies the minute detection voltage of this detection coil. It is composed of a circuit 74. The horizontal drive circuit 73 is
It consists of a differential amplifier 75 consisting of an operational amplifier OPa and an inverter 76 consisting of an operational amplifier OPs with a gain of 1, and the band servo signal from the inter-track sensor part 54 is input to the inverting input terminal of the operational amplifier OPs. A speed servo signal from the speed detection coil 26 that has been amplified by the amplifier circuit 74 is applied to the end, and the difference between the two reference voltages is amplified and a current is supplied to the drive coils 25a and 25b, thereby controlling the speed of the pickup. Drive arm 5. 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 is an operational amplifier OP+
o, and amplifies the minute power generation l of 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, 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 part 54 exhibits a figure-eight curve characteristic as shown in FIG. 15 for the inter-song period. The differential output becomes the band servo signal. Assuming that the needle tip 48 has now moved to the outer circumference of X [-1] with respect to the center of the song, V(v)
A band servo signal is generated. In response to this signal, 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 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 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 applied to the drive coils 25a and 25b to drive the pickup arm 5, magnetic flux is generated by this current, and an alternating current flows to the speed detection coil 26, resulting in 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 cancel coil 80, and the cancel loop is configured to be 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
Addresses A, B>"t-328, 32b, D
D engineering') 7th>"j-34 and end area sensor 3
5 is composed of a light emitting section 53A and a light receiving section 53B.
The pickup plate 27 that interlocks with the pickup arm 5 rotates. Each output from the light receiving section 53B is sent to inverters 82 to 8 that constitute the waveform shaping circuit 81.
5, 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 connected to terminal 1o of the system controller 51, and the address A signal (b) is connected to terminal 1.
2, the address B 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 as explained in FIG.

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

First, the operation at the time of program play by specifying the third song → first song of the 3oct-p board will be explained based on the timing charts of 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 unit 2, and a light emitting diode (hereinafter abbreviated as LED) r3J
(u) appears to be lit but actually blinks once and then lights up)
, indicating that the third song has been programmed. Next, the song selection key “
1", the LED rlJ (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 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
"D r 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 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 inputted 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, the (g+
) becomes the respective level and operates the DD drive system 19, from which the DO drive range is entered. 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. Mechanical drive system 7 remains DD even after latch release
The operation continues in the lead-in direction ahead of the drive system 19, and the cam portion 8a of the rotating member 8 reaches the completion detection switch 42.
is turned off, the output <f> of this switch 42 is input to the terminal 39 at H level, and in response, the terminal 8 (h) becomes H level.
level.

Terminal 9(j) transitions to L level, rotating motor 9(j)
Terminals 8 (h) and 9 ('') are turned on again when the ascent completion detection switch 42 is turned on again.
becomes H level, the rotating motor (j) is stopped, and the special machine is operated with the ascent completion detection switch 42 in the ON state.

While the high-speed lead-in operation by the DD drive system 19 continues, the system controller 51
Address A sensor 3 input from 3 to terminals 12 and 13
2a(p) and the B sensor 32b(q), counting of τ addresses is started, and from the time t4 when the predetermined location is reached, a search is started for recording between songs. Then, when the pickup arm 5 is raised (during a search), a song interval signal (S
) and register the addresses sequentially from between the songs on the innermost track of the disc. At time t5 when the pickup arm 5 reaches the search end address outside the outer edge of the 30 cm LP disc, a final disc size determination is performed.

Size determination is 17c+e, 25ci+ and 39
When searching, the value obtained by adding, for example, 3 to the address indicating the drop position corresponding to the disc size of the cs and the address of the last registered song (the outermost song) registered between songs, as shown in the flowchart of Fig. 19. This is done by sequential comparison, and if the relationship of last registered song address≦first descending address+3 is established, then the actual disc size is determined from the descending position at that time. In addition, the address of 8 songs near the last registered song registered between songs at the time of search and the descending address -5 determined by size judgment
(5 addresses before the descent position), and if the relationship of last registered song/address of 8 songs in the vicinity ≧ descent address - 5 is established, that song will not be considered as a song and will be deleted. - corrections are also made.

After the size determination is completed, terminal 2 of the system controller 51
7 (+) goes to L level, terminal 28 (1) goes to H level (terminal 26 remains at L level), and the drive direction of DD drive system 19 is reversed, so that the pickup arm 5 starts at the first program song. It moves at high speed toward a certain third song, and begins an operation for detecting the third song. At this time (point [5),
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 LED r3J (u) that was in the lit state repeats blinking from time ts until the performance of the third song is completed. To explain the inter-track detection operation according to the flowchart of FIG. 20, when the needle tip 48 of the pickup arm 5 moving at high speed toward the inner circumference of the disk arrives at, for example, address 4 (registered address + 4) before the registered address of the third song. (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(1) 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 the special state, is operated to start the elevation down operation. At this time, 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 a horizontal plane by the DD drive system 19 in response to a band servo signal (a differential signal of the outputs of two inter-track sensors) from the section 54. 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 its output (Q) becomes L level, terminal 9(i) also becomes L level. Then, 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 (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 mute signal (b) output from terminal 2 disappears and becomes L.
The output of the buffer 86 also goes to the L level, turning off the transistor Q3 constituting the muting circuit 87, thereby turning off the muting relay 88 and entering the playing 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 leveling bell VTH of OP7, the sensitivity up/down switching of the inter-song sensor part 54 is turned 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, causing the switch means 78 (shown in Figure 10.14) to become non-conducting, thereby causing the speed detection coil 26 in the DD drive system 19 to go from the horizontal drive circuit. The speed servo signal to 73 is cut off to turn off the speed servo. At the same time, the output of the buffer 89 becomes L level, so that the drive voltage generation circuit 79 (shown in Figure 11)
Resistance R+ at .

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 arm 5 is stopped and controlled to shift to an elevation down operation as described above. If the song interval cannot be found even after searching the back of address 1, move the pickup arm 5 toward the outer circumference at high speed, and reverse the moving direction of the pickup arm 5 when it reaches the address (Il recorded address + 4). , and repeats the same song interval detection operation as described above by moving in the inner circumferential direction at low speed. 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, when the 2nd address comes before the registered address of the 4th song, the system controller 51 enters a special state where the zero cross signal (")9 inter-song signal (S) is input at terminals 14 and 15. In this state, the system controller 51 - The rising edge of the zero-crossing signal (r) after the H-level zero-crossing @(r) is input to the terminal 14 of the controller 51 and one positive pulse, which is the inter-song signal (S), is input to the terminal 15. With timing, the system controller 51 detects that the needle tip has arrived between the third and fourth songs (time point "9"). At time t9, when the end of the performance of the third song is detected, an H level mute signal ( b) is output, and by turning on the transistor Q3, the muting relay 88 is turned on to cut off the audio signal system.At the same time, the sensitivity of the inter-track sensor part 54 is switched up, and the speed servo of the DD drive system 19 is turned on. At this time, the LED rlJ (y) lights up, and the previously lit LED rlJ (v) blinks until the end of the first song's performance. Further, by setting the terminal 8(h) to H level and rotating the rotary motor 9(j) of the mechanical drive system 7 in the upward direction, an elevation-up operation is started. At this time, the rotating member 8 rotates to turn off the descent completion detection switch 43(a).

The rotating member 8 continues to rotate, and the ascent completion detection switch 42 (
f) is turned on (time t1o), terminal 9 (+> becomes H
level, the rotary motor 9(j) stops and completes the elevation-up operation, and at the same time the terminals 26 and 28
becomes the L level, the mechanical drive system 7 operates, and the pickup arm 5 moves at high speed toward the outer circumference toward the first song. Pickup arm 5 picks up the first song f[! (30cg
+ descending position If), and when it arrives at (outside the outer edge of the disc) after passing the 4th address from the registered address of the first track).
At time tn), the terminal 26 of the system controller 51 is high.
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 a low speed. Then, from the time t+z when the set address of the first song is reached, the performance of the first song begins through the same process as the performance of 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 preset lowering position address corresponding to each disc size.

Similarly to 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, when the ascent completion detection switch 42 is turned on [H], the terminal 8 of the system controller 51 is at the H level.

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. Time t I5 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 rotary motor 9 of the mechanical drive system 7 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 218. 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 base 4 protrudes toward the front as shown in FIG. 1(b). Continue the open operation and slide base 4
When the operator turns on the open detection switch 64(e) at time t2, the terminal 6 of the system controller 51 changes to H level, the loading motor 0 is stopped, and the oven operation is completed. If a predetermined time from point [1, for example 2
If the open detection switch 64 does not turn on even after 5 seconds, the motor automatically stops and stands by at that location (fail-safe).

Place the disc 1 on the turntable 3, and at time t3 [
When the "Arm Manual Set" key is turned on, the terminal 19(t) of the system controller 51 goes to L level.
In response to this, the terminal 8(j) goes to the lead-in 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 time t4 when the output (q) of No. 4 is generated, terminals 26 (gi) and 28 (o) of the system controller 51 each become L level, operating the DD drive system 19, and transferring the drive system from the mechanical drive system 7 to the DD drive. Switch to system 19. The mechanical drive system 7 precedes the DD drive system 19 and stands by just before the elevation down operation. The pickup arm 5 continues the lead-in at high speed, and at the time ts when the rising edge of the 103rd pulse of the output (") of the address A sensor 32a is input to the terminal 12 of the system controller 51, the terminal 26 (1) is The level 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 rising edge of the 105th pulse of the address A sensor 32a corresponding to the 30C-lowering position (at 6, the terminal 2B (o) of the system controller 51 becomes H level. , the DD drive system 19 stops, the pickup arm 5 stops in an elevated state, and enters a special state for manual performance.Next, when the "elevation" key is turned on, the terminal 8 (j ) goes to L level, the rotary motor 9 (1) of the mechanical drive system 7 rotates in the down direction and starts the elevation down operation. At this time, the LED "r up" (W) that was lit until then goes out. When the cam portion 8a of the rotating member 8 of the mechanical drive system 70 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 was output from the terminal 2 at the same time disappears and becomes L level), the muting relay 88 is turned off, and the playing state is entered.

During the performance, if the "start" key is held down at time t9, the locate-in operation will begin. First, at time t9, the terminal 8(j) of the system controller 51 becomes H level, the rotary motor 9(1) of the mechanical drive system 7 rotates in the upward direction, and enters an elevation up operation. At the same time LED r
“Start” (V) and “Up” (W) will light up,
Also, an H level mute signal (b) is output from terminal 2, turning on muting relay 88 and interrupting the performance.

When the ascent completion detection switch 42 (h) is turned on (time t
I@), terminal 9 of the system controller 51 (k
) becomes H level, and the rotary motor 9 (1) of the mechanical drive system 7
) to complete the rising state, then terminal 27 (n
) becomes the L level, the DD 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.

``Start EDr'' (V) starts the locate operation from t10 [Continue to hold down the start key; blinks darkly. If you keep pressing the "Start" key and release it at an arbitrary position (time t++), the terminal 27(n) of the system controller 51 becomes H level and the 00 drive system 19 stops, so the pickup arm 5 is in the raised state. stop,
At the same time, the LED "r start" stops blinking. Then, when you turn on the "elevation" key (time t12
) N 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 (O) of the system controller 51 will go to L level after the elevation-up operation is completed, and the big-up arm 5 will move in the outer circumferential direction at low speed. Move (locate out). In addition, regardless of whether the pickup arm 5 is in the up state or the down state, if the pickup arm 5 exceeds the DD 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 DO drive range is exceeded, but the range can be set arbitrarily, and it can be performed when the range is exceeded.

When the performance continues and the needle 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 L level, and the address A2 is input.
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 moment when the end is detected, the 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 "r-up" (blind) 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 (at time t Is ), the logic at terminals 8 and 9 of the system controller 51 is maintained even when the up operation is completed, and the mechanical drive system 7 automatically moves the pickup arm 5 in the rest direction. Start return. At the time t16 when the pickup arm 5 returns to the rest position, the rest position detection switch 4 is activated.
4(a) is turned on, and at time t17 when a predetermined time has elapsed from time t16, terminal 9(a) of the system controller 51 is turned on.
k) 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 at the same time, and the phono motor 5
Stop 5.

When the [Open/Close] key is turned on at time t Is, the terminal 7 (g) of the system controller 51 becomes L level, and in response, the loading motor 60 rotates in the closing direction, and the slide base 4 is moved 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 t)
+9) In response, the system controller 51 sets the terminal 7(g) to H level, and the loading motor 6
0 is stopped, the closing is completed, and all operations are in a standby state.

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, as shown in FIG. 18B, when a program is played, an L level synchronized output (1) is generated at time points "+tlO+t, +2, and 1." in response to the elevation operation. The deck is paused. Because pause → recording is repeated every time one pulse is input to the input, the pause is released only during performance, and only the playback sound can be recorded automatically.When performing manually, the second
As shown in Figure 18, the time t y r t 10 , t
+ and t Is, a sync output h(u> is generated, and the recording state is automatically entered only during performance.

In the above embodiment, the case where the present invention is applied to an offset arm has been described, but the present invention can also be applied to a linear tracking arm.

As detailed above, in the present invention, when the pickup arm is located outside the DD drive range of the DO drive system (second drive system), the pickup arm is forcibly moved by the mechanical drive system (first drive system). This allows the pickup arm to return to the rest position, for example, if the pickup arm is damaged by an external impact during arm locating operation.
Even if the O drive range is exceeded, the mechanical drive system can force the pickup arm to return to the rest position, so the pickup arm can be reliably controlled from then on.Especially since the pickup arm is in the back, it is impossible to touch the arm directly. This is effective when applied to record players whose structure does not allow for this.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the record player according to the present invention, (a) shows the beam in the O-position state, (b) shows the open state, and FIG. 2 is a plan view showing the operating area of the pickup arm. 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 a part of the address sensor, and FIG. 6 7 is a schematic perspective view showing the pickup arm assembly, FIG. 7 is a schematic perspective view showing the head shell part, FIG. 8 is a diagram showing the positional relationship between the song gap sensor and the song gap, and FIG. 9 is the song gap between songs. A diagram showing the output characteristics of the sensor, FIG. 10 is a block diagram showing an example of a control section, FIG. 11 is a circuit diagram showing a specific example of a part of FIG. 10,
Figure 12 is a circuit diagram showing a specific example of a part of the inter-song sensor;
Figure 3 is a waveform diagram of each part in Figure 12, Figure 14 is the DD
FIG. 15 is a circuit diagram showing a specific example of the drive system 19, FIG. 15 is a diagram showing the relationship between songs and band servo signals in band servo, FIG. 16 is a circuit diagram showing a specific example of a part of the address sensor, and FIG. 17 is a diagram showing a specific example of the drive system 19. is a timing chart diagram showing the output of each sensor in FIG. 16, FIGS. 18A and 8 are timing chart diagrams for explaining the operation during program play, and FIG. 19 is a flowchart diagram for explaining the operation of size determination. FIG. 20 is a flowchart for explaining the operation of detecting a song interval, and FIGS. 21A and 21A are timing charts for explaining the operation during manual performance. 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 record player having a first drive system that mechanically drives a pickup arm and a second drive system that directly drives the pickup arm by electromagnetic force,
When the pickup arm is located outside the drive range of the second drive system, the pickup arm is forced to the first drive system and automatically returns to the rest position. Features a pickup arm drive method.