JPS58122647A - Drive device for pickup arm - Google Patents

Abstract

PURPOSE:To improve the arm drive and to detect intermusic accurately, by providing a system driving a pickup mechanically and a system driving it electromagnetically, and using the systems depending on the position of a pickup arm and the operating mode. CONSTITUTION:When the pickup arm 5 being in a rest position A is driven with an operation panel (not shown), a motor 9 is started, and a drive system 7 turns the arm 5 to a position C. An electromagnetic drive (DD) area sensor (not shown) is actuated to switch the DD drive. The system 7 releases a latch and is in waiting state in precedence to the DD system. High-speed lead-in at the DD driving system is continued, an address sensor interlocked with the arm 5 starts count, and an address is registrated every time the interrecording sensor at the arm 5 detects the intermusic from the innermost circumference of a disc. The DD drive is inverted at the outermost circumference, high-speed movement is performed until the 1st program recording, the intermusic is detected, and the arm 5 is lowered with the mechanism driving system in waiting. Thus, the automatic recording selection is performed accurately.

Description

[Detailed description of the invention] The present invention relates to a pickup arm driving device.

The object of the present invention is to provide a pickup arm driving device that can control the pickup arm well according to the operation mode. Drive! ll, and a second drive system that directly drives the pickup arm by tm force, and either one of the first and second drive systems is provided depending on the operation mode or the movement position of the pickup arm. is configured to select.

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, where (a > is a closed state,
(b) shows an open state. As shown in FIG. 1, a record player 1 according to the present invention inserts a disc (not shown) from the front of the main body into a record player 1-η.
It has a so-called front-loading configuration. That is, the open button provided on the operation section 2 on the front of the main body
/ By pressing the choose key 2a, the slide base 4 on which the turntable 3 is mounted moves forward and projects toward the front of the main body. In this open state, after placing the disc on the turn tape 3, pressing the open/close key 2a again causes the slide base 4 to move back (it enters the call state and the disc is set. It is. Also, closed type 1
In 11(a), fully automatic performance is possible by selecting a B-U-gram, and in open state 111(b), performance can be performed by manual operation. Although the door to be installed on the front of the main body is not shown, the door also opens and closes in conjunction with the slide base 4 during the oven/'close operation.

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.
It performs a lead-in operation by rotating in the opposite direction, and after reaching position B, which is slightly outside the outer edge of the 30cm LP disc, it rotates in the Th direction toward the pre-specified song interval. . Pickup arm 5 is at rest position 11A
The rotation range from position B to position B is controlled by two drive systems: a first drive system (hereinafter referred to as mechanical drive system) that drives the pickup arm 5 mechanically; It is selectively driven by a second drive system (hereinafter referred to as DD drive system) that drives directly.

An arm stopper 18 is provided on the player housing side, and an arm stopper 4a/)+ is provided on the slide base 4 side, and when the slide base 4 is stored in the housing, the pickup arm 51 may be -1a is in contact (rest in).

At this time, since a spring 30 is interposed between the pick-up plate 27 and the magnet holder 28 as will be described later (indicated by ``in'' in FIG. 3), the spring 30 is fixed to the pickup plate 27 and driven by the mechanical drive system 7. The bottle member 12 resists the biasing force of the spring 30 and waits in a disabled state.

Then, when the slide base 4 moves forward, the arm stopper 18 and the pickup arm 5 are bent, so that the push 7 of the bin member 12 is released and the pickup arm 5 rotates backward until it comes into contact with the arm stopper 4a. By doing this, the pickup arm 5 does not get in the way when the disc is attached or removed, and the space factor when storing the disc is improved.

3 and 4 are a schematic plan view showing the drive mechanism of the pickup arm and a perspective view of each part before assembly. In FIGS. 3 and 4, the mechanical drive system 7 includes a rotary member 8 that has gears on the outer periphery and is provided coaxially or concentrically with the rotation center axis of the big-up animation 5 and is rotatable, and a drive source. A certain rotating motor 9 and a power transmission unit 10 that is a combination of gears and transmits the driving force of the rotating motor 9 to the rotating 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 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. It is driven in a first rotation range from position A 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;
This 5- is provided integrally with the swinging arm 14, but the idbin 15 is
a guide hole 16 formed in the rotating member 8 to guide the
It consists of a spring member 17 that engages with the swing arm 14 in order to position the swing arm 14 in the engagement position P or non-engagement position Q in which the swing arm 14 can be engaged with the bottle member 12 mentioned above. When in the alignment position P, the pickup arm 5 is rotated in accordance with the rotation of the rotation member 8 by gripping the bottle member 12 in cooperation with the grip member 18 provided on the rotation member 8. When the position C is reached, the pickup arm 5 is reversed to the non-engaged position 1tQ and disengaged from the bin member 12, thereby stopping the drive of the pickup arm 5.

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.
2nd to position B slightly outside the outer edge of the 0cmLP disc
The pickup arm 5 is driven within the rotation range.

The movable magnet 20 is attached to the bearing 22 of the arm stand 21.
The rotating shaft 6- is fixed to the rotating shaft (not shown) of a rotatably held pickup arm 5 so as to face the yoke 23 at a predetermined distance from each other, and has different magnetic poles in the circumferential direction. The magnets are magnetized in the thickness direction so as to be arranged alternately in correspondence with the drive coil and speed detection coil. On the other hand, the substrate 24 is positioned between the magnet 20 and the yoke 23.
is attached to the arm stand 21, and this board 24 has a pair of drive coils 25 for rotating the pickup arm 5 by electromagnetic force in cooperation with the magnet 20.
A speed detection coil 26 for detecting the rotational speed of the pickup arm 5, 25b, and the pickup arm 5 is fixed. A pair of drive coils 25a and 25b are arranged at a positional relationship of approximately 180° around the rotation center axis of the pickup arm 5, and the speed detection coil 26 is driven by the drive coils 25a, 25.
b,! : Provided at approximately 90' (7) positional relationship.

Drive current is supplied to the drive coils 25a and 25b from a horizontal drive circuit, which will be described later, when the pickup arm 5 reaches position D (as shown in the third diagram), and when the pickup arm 5 reaches position C, the drive system is supplied from the mechanical drive system 7. Switching to the DD drive system 19, the second
In the rotation range (from position D to position B), driving is performed by one D drive system, and at the same time the speed detection coil 26
The output of is fed back to the horizontal drive circuit to control the speed &t+m+ of the pickup arm 5. Incidentally, in order to reliably switch from the mechanical drive system 7 to the DD drive system 19, an overlap 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 installed rotatably with respect to the rotation axis of the pickup arm 5, and the pickup plate 27 is attached to the pickup arm 5 by an eccentric cam 29 that engages with a magnet holder 28 through a long hole 27a formed in the pickup plate 27. It is attached to a magnet holder 28 so that its position can be adjusted in a horizontal plane, 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 above-mentioned bottle member 1 is attached to the pickup plate 27.
2 is fixed.

As shown in FIG. 5, the pickup plate 27 is provided with a slit portion 31 consisting of a large number of slits to enable address setting corresponding to the rotational position of the pickup arm 5.
is formed. And the pickup arm 5 is the second
An address A sensor 32a and an address B sensor 32b are provided so as to be located in the slit portion 31 of the pickup plate 27 when the rotary cylinder H (positions 11D to 11B in FIG. 3) is located. 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. Fully automatic performance of program performance 1 is performed by the output of end area sensor υ-35.

To enable end detection based on each output of an address sensor at address A9 during manual performance. These Sen”j
-32a, 32b, 34 and 35 are light-emitting and light-receiving elements disposed to face each other with the pickup plate 27 in between, and as shown in FIG.
It is housed in a holder 36 that can be attached to.

In FIGS. 3 and 4, the rotating part 08 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 elvage 3 link 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 bias the elevation shaft 38 downward. On the mechanical chassis 41 on which the mechanical drive system 7 is mounted 10-, there are switches 42 and 43 for detecting the completion of raising and lowering the pickup arm 5 due to the elevation operation, and switches 42 and 43 for detecting the completion of the raising and lowering of the pickup arm 5. A switch 44 for detecting the digit 1fA in the figure is provided. These switches are operated by being pressed by a cam portion 8a provided on the outer periphery of the rotating member 38. Ueno completion detection switch 4
2 is a pickup arm 5 during lead-in operation.
It is also used to detect the position just before the descent starts due to the elevator movement. That is, during the lead-in operation, the mechanical drive system 7, which precedes the rotation of the pickup arm 5 by the DD drive system 19 in the second rotation range after the drive operation of the pickup arm 5 is completed, is activated by the one-up completion detection switch. 42, the robot is placed on standby just before the final stroke in which the elevation operation is performed in response to the output of the controller 42. 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 the pickup arm assembly including the DD drive system 19 and the big door knob plate 27 mentioned above. A song interval sensor 46 is provided at its tip 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.
This light emitting element 49 and the feet arranged along the rotational direction of the pickup arm 5 so as to be symmetrical with respect to the vertical plane.
It is composed of two light receiving elements 50a and 50b such as transistors, and is preferably arranged as close to the needle tip 48 as possible. 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 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 are arranged at (a) in FIG.
) and (b), and when the stylus tip 48 of the cartridge 47 is located above the center of the song, the output (
A) and (b) have the relationship shown in FIG. 9 with respect to the center of the song.

FIG. 10 is a block diagram showing an example of the control section, and FIG. 11 is a circuit diagram showing a specific example of a part of FIG. 10. 1st
In FIGS. 0 and 11, numeral 51 is a system controller that centrally controls all of the blocks, and is composed of, for example, a 4-bit 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, and address 13 from the address sensor part 53.
- the inter-song signal and the inter-song signal from the inter-song sensor part 54 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 synchronization circuit 58 is a 14-interface circuit for sending a recording synchronization signal to a digital recorder (not shown) that is selectively connected in response to a control signal from the system controller 51 when the synchronization switch 61 is turned on. . Here, the synchro output terminal 62 of this system is connected to the remote pause terminal of the tape deck, and when the synchro output terminal 62 of this system is put in the recording pause state and the synchro switch 61 is turned on, the deck goes into the recording state while the player is playing. This is a function in which the deck enters a pause state when the player is in an elevation-up state or while the arm is moving, and the deck repeats pause-recording (pause release) every time one pulse is input to the pause terminal. There is. The switch section 52 is provided with switches 42 and 44 for detecting the completion of raising the pickup arm 5 and the rest position, as well as switches 63 and 64 for detecting the closed state and open state of the player body.

FIG. 12 is a circuit diagram showing a specific example of the inter-song sensor part 54 in FIG. 10. In this figure, the inter-track sensor 4
6 consists of a heavy light emitting element 49 and two light receiving elements 508 and 50b as explained in FIG.
a and 50b each receive the reflected light from the disk 6 and generate an output according to the amount of the received light. The two sensor outputs are connected to operational amplifier OP1. After being amplified by an amplifier circuit 65 including OP2, it is supplied to a differential amplifier circuit 66, and one sensor output is also supplied to an AC amplifier circuit 67.

The two Hinser 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 OP3 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 becomes each non-inverting input of the operational amplifier OP4 which constitutes the inter-song comparator 68 and the operational amplifier OPs which constitutes the zero-cross comparator 69. operational amplifier OP
A reference level VT)-1 is applied to the inverting input terminal of a, and the reference level VT changes according to the sensitivity selection by the sensitivity selector switch 70, and even if the sensitivity is the same, the pickup arm 5 is raised. , also changes depending on the down operation.

This means that 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, the reference level V
This is done in order to reliably discriminate between songs and sound grooves by changing the TH, and by turning the switch means 71 on and off in accordance with the elevation operation of the pickup arm 5, the reference level V step 1-1 is set. switching is performed. The output of the operational amplifier OP4 is input as an inter-music signal to the system controller 51 (terminal 15 in FIG. 11).

The AC amplifier circuit 67 cuts DC from one sensor output of the amplifier circuit 65 with a capacitor CO and operates an operational amplifier OPs.
After performing AC amplification in the search comparator 90, the operational amplifier 0. P is supplied to the non-inverting input of y. In the zero-cross comparator 69, the operational amplifier OPs has the fixed reference voltage 82 as an inverting input, detects the zero-cross point of the differential signal from the differential amplifier circuit 66, and outputs a zero-couple loss signal. On the other hand, the operational amplifier OPy of the search comparator 90 has the same reference level VTI-1 as the operational amplifier OP 4 as an inverting input, and the AC amplifier circuit 6
7 and outputs a signal that is lower than the reference level VTH as an inter-track registration permission signal. The zero cross signal and the inter-song registration permission signal are input to the gate circuit 72.
Based on the mute signal output from the system controller 51 (terminal 2 in FIG. It is input to terminal 14) in Figure 11. 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 includes drive coils 25a and 25b connected in series, a horizontal drive port 18-path 73 that supplies drive current to the drive coils, a speed detection coil 26, and a minute detection voltage of this detection coil. and an amplifier circuit 74 that amplifies the. The horizontal drive circuit 73 includes a differential amplifier 75 consisting of an operational amplifier OPg, 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 connected to the inverting input terminal of the operational amplifier OPs. However, the speed servo signal from the speed detection coil 26 amplified by the amplifier circuit 74 is applied to the non-inverting input terminal, and the difference between the two with respect to the reference voltage is amplified and the drive coils 2ga, 25
By supplying current to b, the pickup arm 5 is driven while controlling its speed. The band servo signal and the speed servo signal are each supplied to the differential amplifier 75 as necessary by switch means 77 and 78 that turn on and off in accordance with control from the system controller 51. Amplification circuit 7
Reference numeral 4 has an operational amplifier OP +o, 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, VR+ is a polygon 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. If the needle tip 48 has now moved to the outer periphery of
v) band servo signal is generated. In response to this signal, current is supplied from the horizontal drive circuit 73 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 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 plays, the drive voltage generated by the drive voltage generation circuit 79 (Fig. 1-1) is used. is applied to the inverting input terminal of the performance amplifier OPa, and the drive voltage generation circuit 79 generates a signal based on a control signal indicating high-speed, inner-circumferential and outer-circumferential driving 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 drive voltage with respect to the reference 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 cancels the noise component generated by the drive coils 25a and 25b, thereby reducing the S of the output of the speed detection coil 26.
/N 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 an alternating current flows through the speed detection coil 26, creating a noise component. By providing it in series with the detection coil 26, the alternating current component can be canceled.

A variable resistor VRx is connected in parallel to the canceling coil 80, and the amount of canceling is variable by this variable resistor VR2.

FIG. 16 is a circuit diagram showing a specific example of the address sensor part 53 in FIG. 10, which includes a light emitting section 53A having four light emitting diodes and a light receiving section 53A having four phototransistors arranged opposite to these light emitting diodes. Section 53B
According to address A, B sensor 32a, 32b, DD
An area sensor 34 and an end area sensor 35 are configured, and a pickup plate 2 interlocks with the pickup arm 5 to maintain the gap between the light emitting part 53Δ and the light receiving part 53B.
7 rotates. Each output from the light receiving section 53B is waveform-shaped by inverters 82 to 85 constituting a waveform shaping circuit 81, and is outputted to the disk 6 at the timing shown in FIG. 17 during the lead-in operation of the pickup arm 5. The end area signal (a > is sent to terminal 10 of the system controller 51, the address 22- signal (1)) is sent to terminal 12, the address B signal (C) is sent to terminal 13, and the DD area signal (d) is sent to terminal 11. are applied respectively. The role of each sensor is as explained in FIG.

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

First, the operation when performing a program by specifying the third song → first song on the 30C LP 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 the light emitting diode (hereinafter abbreviated as ED) 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 input to the terminal 11 of the system controller 51 at H level, and in response, the output (0) of the DD area sensor 34 is inputted to the terminal 11 of the system controller 51, and in response, 28 (+n
) respectively become 1-level, operating the DD drive system 19, and entering the DD drive range from here. After entering the DD drive range, the latch of the mechanical drive system 7 is released, and at this point, the drive system of the pickup arm 5 is switched from the mechanical drive system 7 to the DD drive system 19. Mechanical drive system 7 remains D even after the latch is released.
The operation continues in the lead-in direction in advance of the O drive system 19, and the cam portion 8a of the rotating member 8 reaches the ascent completion detection switch 4.
2 is turned off, the output (f) of this switch 42 is inputted to the terminal 39 at H level, and in response, the terminal 8 (h) becomes H level.

Terminal 9 (j) transitions to L level, rotating motor 9 (
j) in the lead-out direction, and when the ascent completion detection switch 42 is turned on again, terminals 8(h) and 9(
j) becomes H level, the rotating motor (j) is stopped, and the ascent completion detection switch 42 is on standby.

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), address counting is started from 1, and when a predetermined address is reached, a search is started to register between songs. Then, when the pickup arm 5 is raised (during search), the song interval signal (S) is inputted from the song interval sensor part 54 to the terminal 14 and inputted to the terminal 15 in response to the song interval registration permission signal (r). , the addresses are registered sequentially starting from song 25- on the innermost track of the disc. Pickup arm 5 is 30
A final disc size determination is performed at time t5 when the search end address outside the outer edge of the cmLP disc is reached.

Size determination is 17cm, 25cm and 30CI in advance.
Search for the value obtained by adding, for example, 3 to the address indicating the drop position corresponding to the disc size of ll, and the address of the last registered (outermost song) that has been merged between songs, especially as shown in the flowchart of FIG. 19. This is done by sequentially comparing the , and if the relationship of last registered address ≦ descent position address + 3 is established,
The actual disk size is determined from the dismounting position at that time. In addition, the address of each city in the vicinity of the final registration registered between songs during the search is compared with the value of descending address -5 (5th address before the descent position) determined by size judgment, and the address of each city in the vicinity of the final registration is compared. If the relationship ≧falling address -5 is established, the registration of the song is modified so that it is not considered as a song and is deleted.

After the size determination is completed, terminal 2 of the system controller 51
7 (+) goes to L level, D@ child 28 (a+) goes to 26-H level (terminal 26 remains at L level), the driving direction of the DD drive system 19 is reversed, and the big up arm 5 becomes It moves at high speed toward the third song, which is the first program song, and enters an operation for detecting the third song. At this time(
At time t5), at the same time, terminal 4(d) becomes L level,
Start the phono motor 55 and turn the turntable 3(e)
Rotate. The LED r3J that was also lit
(u) repeats blinking from time t5 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 1 level, and the moving speed of the arm becomes low. Then, in the low-speed driving state, the detection between songs is performed from before the third song, and the sensor between songs 54
When the inter-song signal (S> from
) and sets the terminal 27 (+) to H level to stop the DD drive system 19, and at the same time, the LE that had been lit until then
Turn off "Start" (W) and "Up" (y). At the same time, the terminal 8(h) is set to L level, and the rotating motor 9(j) of the mechanical drive system 7, which has been in the special state until then,
to start the elevation down operation.

At this time, terminal 3 (C) also goes to L level and transistor Q2
(By setting the collector shown in 11111 to H level, the switch means 77 (shown in Fig. 10.14) is brought into conduction state, and the band servo is turned on. The pickup arm 5 is driven in a horizontal plane by the DD drive system 19 in accordance with the output differential signal (output differential signal).The band servo allows the pickup arm 5 to be driven in the horizontal plane by the DD drive system 19.Even if there is eccentricity of the disc, the pickup arm 5 is driven by the DD drive system 19. Needle tip 4 of pickup arm 5
8 can be lowered and positioned at the center of the song.

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 (0) becomes L level, the terminal 9(i) also becomes L level. Then, the rotary motor 9 (j) of the mechanical drive system 7 stops, completes the down operation, and starts playing the third song.At the same time, the terminal 3 (C) changes to H level, and the switch is turned on by turning on the transistor Q2. The band servo is turned off by making the means 77 non-conductive.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 reference level Tl-1 of OP7, the sensitivity up/down switching of the inter-song sensor part 54 is turned down. Furthermore, 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-conductive, thereby causing the speed detection coil 26 in the DD drive system 19 to The speed servo signal to the horizontal drive circuit 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 resistance R+ in the drive voltage generation circuit 79 (shown in FIG. 11) increases.

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 anti-skating during performance.

When detecting between songs, if the song - is not found, the location is further than the registered address of the third song, for example 11 (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 for the first address, move the pickup arm 5 toward the outer circumference at high speed, and when it reaches the address (registered address + 4), reverse the moving direction of the pickup arm '5. , and repeats the same song interval 30 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 this 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 address 2 is before the registered address of the 4th song, the system controller 51 enters a special state where the zero cross signal (") and the inter-song signal (S) are input at the terminals 14 and 15. In this state, the system controller 51 The system team is activated at the timing of the rise of the zero-crossing signal (r) of the bond, in which an H-level zero-cross signal ('') is input to the terminal 14 of the terminal 14, and one positive pulse, which is the inter-song signal (S), is input to the terminal 15. The controller 51 detects that the needle tip has arrived between the third and fourth songs (time rs). At time t9 when the end of the third song is detected, an H level mute signal (b) is output from terminal 2. By turning on the transistor Q3, the muting relay 88 is turned on and cuts off the audio signal system.
Switch the sensitivity to up and turn on the speed servo of the DD drive system 19. At this time, the LED "r up" (■) lights up, and the previously lit LED MJ (v) blinks until the end of the first song's performance. Further, the terminal 8(h) is set to level T and the rotary motor 9(J) of the mechanical drive system 7 is rotated in the upward direction to start the elevation up operation. At this time, the rotating member 8 rotates to turn off the descent completion detection switch 43 (+1).

The rotating member 8 continues to rotate, and the one-piece completion detection switch 42 (
At the time t tG ) when f) is turned on, terminal 9 (1)
), the rotation motor 9(j) stops and the elevation-up operation is completed, and at the same time the terminals 26 and 28 become L level, the mechanical drive system 7 operates and the pickup arm 5 moves toward the first song. and move toward the outer circumference at high speed. Pickup arm 5 moves between the first song (30c
- lowering position) and reaches the point 41 places (outside the outer edge of the disc) from the registered address of the first song (t n ), the terminal 26 of the system controller 51
is at H level, terminal 27 is at L level, and terminal 28 is at H level, and DD drive system 19 reverses the drive direction and moves pickup arm 5 toward the first song at low speed.

Then, from the time point 1+1 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, 1. Then, terminal 8 of the system controller 51 is at 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. At time t+5 when the pickup 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 (( 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 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 tl, 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 A-Pun motion and move to the slide base 4.
At time t2, when the open detection switch 64(e) is turned on, the terminal 6 of the system controller 51 changes to the H level, the 0-ding motor 60 is stopped, and the open operation is completed. If the open detection switch 64 does not turn on even after a predetermined period of time, for example 25 seconds, has elapsed, the motor will automatically stop and the motor will be turned on at that point (fail-safe).

Place the disc on turntable 3, and at point [3]
When the "Arm Manual Set" key is turned on, the terminal 19(t) of the system controller 51 goes to the open 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 DO area sensor 3
At the time t4 when the output (Q) of 4 is generated, terminals 26 (m) and 28 (0) of the system controller 51 are respectively set to L.
level, the DD drive system 19 is operated, and the drive system is switched from the mechanical drive system 7f)X to one DO drive system. The mechanical drive system 7 precedes the DD drive system 19 and is activated immediately before the elevation down operation. The pickup arm 5 continues the lead-in at high speed, and at the time when, for example, the rising edge of the 103rd pulse of the output (") of the address A sensor + J-32a is input to the terminal 12 of the system controller 51 [5
At this point, the terminal 26(1) becomes H level, and the moving speed of the pickup arm 5 becomes low.

The pickup arm 5 continues lead-in at a low speed, and at the time t6 of the 105th pulse of the address A sensor 32a corresponding to the 3Qcm lowered position, the terminal 28 (o) of the system controller 51 becomes l. ” level, one DD drive system stops, the pickup arm 5 stops in the raised position, and V1m of manual performance is reached.
state. Next, turn on the "elevation" key.

Then, the terminal 8(j) of the system controller 51 goes to the down level, the rotary motor 9(1) of the mechanical drive system 7 rotates in the down direction, and the elevation down operation starts.

At this time, the LED that had been lit until then turned up (
W) goes out. Cam portion 8 of rotating member 8 of mechanical drive system 7
When a turns on the time 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 drive system 7
stops. At this time, the mute signal (b) which had been output from the terminal 2 at the same time disappears and becomes L level), the muting relay 88 is turned off, and a performance state is entered.

During the performance, if the "start" key is held down at time t9, the operation shifts to the "O-Kate-in" operation. 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 state switch 42 (h) is turned on (time L
jo), 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
), the DD drive 37-system 19 is operated, and the pickup arm 5 is moved in the inner circumferential direction at low speed, resulting in zero-bit operation.

The LED ``Start'' (V) flashes while the ``Start'' key is held down from the point in time when the locate operation begins. When the "Start" key is pressed and released at an arbitrary position (time point E u ), the terminal 27 (n) of the system controller 51 becomes H level and the DD drive system 19 stops, so the pickup arm 5 is in the raised state. stop,
At the same time, the blinking of ``LE[)r start'' ends. Then, when you turn on the "elevation" key (time t12
), and enters the playing state at time t13 through a turn-down operation in the same manner as in the manual lead-in case.

When performing a locate operation, if you keep pressing the "stop" key, the terminal 28 (0) of the system controller 51 will go to L level after the elevation-up operation is completed, and the pickup arm 5 will move toward the outer circumference at low speed. (locate out). In addition, regardless of whether the pickup arm 5 is in the up or down state, if the pickup arm 5 exceeds the DO drive range, the mechanical drive system 7 operates to automatically return the pickup arm 5 to the rest position (forced return). ). This forced return is not limited to the case where the DD drive range is exceeded, but the range can be arbitrarily set and it can be performed when the range is exceeded.

When the performance continues and the needle tip 48 comes near the lead-out groove, the output (p) of the end area sensor 35 is input to the terminal 10 of the system controller 51 at L level, and the address A1 is inputted to the terminal 10 of the system controller 51.
Based on the outputs (r) and (s) of the address sensors 32a and 32b, end detection is performed when the needle tip 48 enters the lead-out groove and the feeding speed increases. At the point when the end is detected, terminal 8(j) of the system controller 51 becomes H level (terminal 9 remains at L level), and the elevation up operation is started. At this time, the LED "I'up" (
W) lights up and the mute signal (b) is output, turning on the muting relay 88 and cutting off the audio signal system. When the ascent completion detection switch 42 (h) is turned on at the time tis>, the logic of the terminals 8 and 9 of the system controller 51 is maintained even when the up operation is completed, and the mechanical drive system 7 causes the pickup arm 5 to auto-return in the rest direction. Start. 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(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 at the same time, and the phono motor 55
to stop.

When the "A-Pun, 'Close" key is turned on at time t18, 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 rotated. It is driven to be stored inside the main body. When the storage is completed and the slide base turns on the close detection switch 63 (d) (time T + s), the system controller 51 responds by setting the terminal 7 (g) to H level and stopping the loading motor 6o. The close 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.

During program performance, the terminal 25 of the system controller 51 generates an L level synchronized output (1) at time points t y , j to l t +2, and j +4 in response to the elevation operation, as shown in FIG. 18B. . Since the deck repeats pause-recording every time one pulse is entered into the pause input, the pause is released only during performance, and only the reproduced sound can be automatically recorded. During manual performance, as shown in FIG. 21B, at time t 7 ,
Synchro output (U) is generated at t 10 , j +2, and t +5, 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 41-arm has been described, but the present invention is also applicable to a linear tracking 7-arm.

As described in detail above, the present invention includes a first drive system that mechanically drives the pickup arm and a second drive system that directly drives the pickup arm using electromagnetic force. Since one of the first and second drive systems is selected depending on the movement position, the pickup arm can be favorably controlled in accordance with the operation mode. In other words, if the movement range of the big-up arm is wide, the second
In the drive system (DD drive system), there is a limit to the area that can be driven with a large driving force, so by making that area correspond to the performance area, it is possible to improve the detection accuracy during song interval detection mode, etc. The first drive system (
The pickup arm can be driven with great driving force by the mechanical drive system.

42-

[Brief explanation of the drawing]

11 is a schematic perspective view showing the record player according to the present invention, (a) shows the closed state, (b) shows the open state, FIG. 2 is a plan view showing the operating area of the pickup arm, and FIG. 3 and FIG. 4 is a schematic plan view showing the drive mechanism of the pickup arm and a perspective view of each part before assembly;
FIG. 5 is a plan view showing the positional relationship between the pickup plate and part of the address sensor, FIG. 6 is a schematic perspective view showing the pickup arm assembly, FIG. 7 is a schematic perspective view showing the head shell, and FIG. 8 is a schematic perspective view showing the pickup arm assembly. FIG. 9 is a diagram showing the positional relationship between the inter-song sensor and the inter-song period, FIG. 9 is a diagram showing the output characteristics of the inter-song sensor between songs, FIG. 10 is a block diagram showing an example of the control section, and FIG. FIG. 12 is a circuit diagram showing a specific example of a part of the inter-song sensor, FIG. 13 is a waveform diagram of each part in FIG. 12, and FIG. 14 is a D
A circuit diagram showing a specific example of the O drive system 19, FIG. 15 is a diagram showing the relationship between song intervals and band servo signals in band servo, FIG. 16 is a circuit diagram showing a specific example of a part of the address sensor,
Fig. 17 is a timing chart showing the outputs of each sensor in Fig. 16, Figs.
The figure is a 70-chart diagram to explain the operation of size determination, Figure 20 is a flowchart diagram to explain the operation of detecting between songs, and Figures 21A and B are timing diagrams to explain the operation during manual performance. It is a chart diagram. Explanation of symbols of main parts 2...Operation unit 5...Pickup arm 7...Mechanical drive system 8...Rotating member 9... One rotation 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...Loading motor 70...Sensitivity changeover switch 71.77.78...Switch means 79...
... Drive voltage generation circuit 80 ... Cancellation coil 87 ... Muting circuit Applicant Pioneer Co., Ltd. agent Patent attorney - Hiko Muramoto 45 -

Claims (1)

[Claims] The first drive system mechanically drives the pickup arm, and the second drive system directly drives the pickup arm by electromagnetic force, and the first drive system and the second drive system directly drive the pickup arm by electromagnetic force. A pickup arm drive device, characterized in that one of the second drive systems (1 deviation b\) is selected.