JPH0145126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting intervals between songs, and more particularly to a method for detecting intervals between songs in a record player capable of program play.

The purpose is to provide a song interval detection method that can quickly and reliably detect specified song intervals.

The song interval detection method according to the present invention includes searching for a song interval based on the output of the song interval sensor and the output of the address sensor during the lead-in operation of a pick-up arm equipped with an address sensor for detecting the arm position and a song interval sensor. The address is set based on the address and the interval between songs is registered, and during song selection operation, the pick-up arm is driven at high speed until it reaches the vicinity of the designated address, and after reaching the vicinity of the designated address, the pick-up arm is driven at low speed. The song interval is detected based on the output of the song interval sensor.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view showing a record player according to the present invention, in which a is a closed state;
b indicates an open state. As shown in FIG. 1, the record player 1 according to the present invention has a so-called front loading configuration in which a disc (not shown) can be set from the front of the main body. That is, by pressing the open/close key 2a provided on the operation section 2 on the front of the main body, the slide base 4 on which the turntable 3 is mounted moves forward and protrudes toward the front of the main body (open state), and in this open state, the slide base 4 carries the turntable 3. After placing the disk on table 3, press open/close key 2 again.
By pressing a, the slide base 4 is moved back to the closed state, and the disk is set. Further, in the closed state a, fully automatic performance by program selection is possible, and in the open state b, performance can be performed by manual operation. Although a door to be provided on the front side of the main body is not shown, the door also performs opening/closing operations in conjunction with the slide base 4 during opening/closing operations.

The pick-up arm 5 is attached to the slide base 4 in order to reduce the width of the slide base 4 and to make it easier to set the disc onto the turntable 3.
This position is the rest position. This pick-up arm 5 has an area X shown in FIG. 2 as a performance area, and performs a lead-in operation by rotating above the disk 6 from a rest position A in a direction L opposite to the tracing direction T during performance. Position B slightly outside the outer edge of the 30cmLP disc
After reaching this point, it rotates in the T direction toward a pre-specified song interval. The pick-up arm 5 rotates from rest position A to position B using two drive systems: a first drive system (hereinafter referred to as mechanical drive system) that mechanically drives the pick-up arm 5;
and a second drive system (hereinafter referred to as DD drive system) that directly drives the pickup arm 5 by electromagnetic force.

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

3 and 4 are a schematic plan view showing the drive mechanism of the pick-up arm and a perspective view of each part before assembly. In FIGS. 3 and 4, the mechanical drive system 7 includes a rotary member 8 that has gears on its outer periphery and is rotatable coaxially or concentrically with the rotation center axis of the pick-up arm 5, and a drive source. Rotating motor 9
and a power transmission section 10 that is composed of a combination of gears and transmits the driving force of the rotary motor 9 to the rotary member 8;
The latch mechanism 11 is provided with a latch mechanism 11 provided on the rotating member 8, and the latch mechanism 11 selectively engages with a pin member 12 that interlocks with the pick-up arm 5 in accordance with the rotation of the rotating member 8, thereby resting the pick-up arm 5. From position A to position C near the center of the disk
It is driven in the first rotation range up to. The latch mechanism 11 rotates to guide a swinging arm 14 that is pivotably supported by a pin 13 implanted in the rotating member 8 and a guide pin 15 that is provided integrally with the swinging arm 14. A guide hole 16 formed in the member 8 and a spring member that engages with the swing arm 14 to position the swing arm 14 in the engagement position P or non-engagement position Q where the swing arm 14 can be engaged with the pin member 12 described above. 17, and when the swinging arm 14 is in the engagement position P, it cooperates with a gripping member 18 provided on the rotating member 8 to grip the pin member 12, thereby responding to the rotation of the rotating member 8. When the pick-up arm 5 reaches position C, it is reversed to the non-engaging position Q and disengaged from the pin member 12, thereby stopping the drive of the pick-up arm 5.

On the other hand, the DD drive system 19 includes, for example, a movable magnet provided on the pick-up arm side and a fixed coil provided on the arm stand side. The pick-up arm 5 is driven in the second rotation range. Movable magnet 2
0 is fixed to a rotating shaft (not shown) of a pick-up arm 5 rotatably held by a bearing 22 of an arm stand 21 so as to face a yoke 23 at a predetermined distance from each other. Different magnetic poles are magnetized in the thickness direction so as to be arranged alternately in correspondence with a drive coil and a speed detection coil, which will be described later. On the other hand, a board 24 is attached to the arm stand 21 so as to be located between the magnet 20 and the yoke 23.
A pair of driving coils 25a and 25b which cooperate with the magnet 20 to rotationally drive the pick-up arm 5 by electromagnetic force, and a speed detection coil 26 which detects the rotational speed of the pick-up arm 5 are fixed to the coil. A pair of drive coils 25a and 25b are arranged approximately around the central axis of rotation of the pick-up arm 5.
The speed detection coil 26 is arranged at a positional relationship of 180°.
are provided in a positional relationship of approximately 90 degrees with the drive coils 25a and 25b. Drive current is supplied to the drive coils 25a and 25b from a horizontal drive circuit, which will be described later, when the pick-up arm 5 reaches position D (as shown in the third figure), and when the pick-up arm 5 reaches position C, the drive system is supplied from the mechanical drive system 7. The drive is switched to the DD drive system 19, and the drive is performed by the DD drive system 19 in the second rotation range (position D to position B), and at the same time, the output of the speed detection coil 26 is fed back to the horizontal drive circuit to drive the pickup arm. 5 speed control is performed. In addition, mechanical drive system 7 to DD drive system 19
In order to ensure reliable switching, an overlapping portion (positions D to C) is provided in the first and second rotation ranges.

For example, a pick-up plate 27 is provided below the magnet 20 so as to be rotatable about the rotation axis of the pick-up arm 5, and this pick-up plate 27 engages with a magnet holder 28 through a long hole 27a formed in the pick-up plate 27. The eccentric cam 29 is attached to the magnetic holder 28 so that the position relative to the pick-up arm 5 can be adjusted in a horizontal plane, and rotates together with the pick-up arm 5. A spring 30 is installed between the pick-up plate 27 and the magnetic holder 28.
is interposed therebetween, and the aforementioned pin member 12 is fixed to the pick-up plate 27.

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

In FIGS. 3 and 4, an elevation cam 37 of the pickup arm 5 is provided on the rotating member 8 of the mechanical drive system 7. As shown in FIGS. One end of an elevation shaft 38 held movably up and down by the arm stand 21 is in contact with the elevator cam 37, and the other end of the elevator shaft 38 is in contact with an elevator plate 39 that supports the pick-up arm 5. Fixed. A spring 50 is interposed between the arm stand 21 and one end of the elevation shaft 38 so that the elevation shaft 3
8 is urged downward. On the mechanical chassis 41 on which the mechanical drive system 7 is mounted, there are switches 42 and 43 for detecting the completion of raising and lowering the pick-up arm 5 due to the elevator operation.
A switch 44 is provided for detecting the rest position (position A in FIG. 3) of the pick-up arm 5. These switches are operated by being pressed by a cam portion 8a provided on the outer periphery of the rotating member 38. Ascent completion detection switch 42
is also used to detect the position just before the pick-up arm 5 starts descending due to the elevation operation during the lead-in operation. That is, during the lead-in operation, the DD drive system 19 is rotated in the second rotation range after the drive operation of the pick-up arm 5 is completed.
The mechanical drive system 7, which precedes the rotation of the pick-up arm 5, is put on standby just before the final stroke of the elevator operation in response to the output of the lift completion detection switch 42. The rotating member 8 of the mechanical drive system 7 starts rotating again in order to lower the pick-up arm 5 in response to a descending command issued when the pick-up arm 5 reaches a desired music interval.

FIG. 6 shows a schematic perspective view of the pick-up arm assembly including the aforementioned DD drive system 19 and pick-up plate 27, and the head shell 45 attached to the tip of the pick-up arm 5 corresponds to the sound groove of a record. A song interval sensor 46 is provided at its tip for distinguishing between songs and sound grooves by utilizing the difference in reflectance between songs. As shown in FIG. 7, the song interval sensor 46 uses a single light emitting element 49 such as a light emitting diode located in a vertical plane including the tip 48 of the cartridge 47 as a common light source. Two phototransistors, etc., arranged along the rotational direction of the pick-up arm 5 so as to be symmetrical with respect to the vertical plane.
The light receiving elements 50a and 50b are 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 pick-up arm 5 rotates toward the outer circumference of the disk, and receives reflected light from the disk 6 based on the light emitted from the light-emitting element 49. It generates an output according to the amount of light received.
On the other hand, the light-receiving element 50b precedes the light-receiving element 50a when the pick-up arm 5 rotates toward the inner circumference of the disk, and similarly generates an output corresponding to the amount of light reflected from the disk 6 based on the light irradiated from the light-emitting element 49. do. The light-receiving elements 50a and 50b respectively generate outputs as shown in a and b in FIG. and b have the relationship shown in FIG. 9 with respect to the center of the song.

FIG. 10 is a block diagram showing an example of the control section, and FIG. 11 is a circuit diagram showing a specific example of a portion of FIG. In FIGS. 10 and 11, 51 is a system controller that centrally controls all of the blocks, and is comprised of, for example, a 4-bit microcomputer. The system controller 51 receives various command signals from the operating section 2, signals indicating the operating status of the system from the switch section 52, address signals from the address sensor section 53, and inter-song signals from the inter-song sensor section 54. applied. In response to these signals, the system controller 51 sends control signals to the DD drive system 19, the decoder converter circuit 58, and the like.

The operation section 2 is provided with all the operation keys for program selection, command keys for commanding various operations, and light emitting diodes for displaying the operations of these keys. The arm drive unit 56 is an interface that drives the arm drive motor (rotary motor) 9 of the mechanical drive system 7 in response to a control signal from the system controller 51 and an output signal from the lowering completion detection switch 43. The loading drive unit 57 is the system controller 5
Slide base 4 in response to a control signal from 1
This is an interface that drives a loading motor 60 for moving the robot (FIG. 1). The digital synchro circuit 58 is an interface circuit for sending a recording synchro signal to a tape deck (not shown) selectively connected in response to a control signal from the system controller 51 when the synchro switch 61 is turned on. Here, the synchro output terminal 62 of this system is connected to the remote pause terminal of the tape deck.
Put it in recording pause state and press synchro switch 6.
When 1 is turned on, the deck is in the recording state while the player is playing, and the deck is in the pause state when the player is in the elevation up state or the arm is moving, and the deck receives one pulse input to the pause terminal. It is designed to repeat the pause ← → recording (pause release) every time it is paused. The switch section 52 includes switches 42 and 44 for detecting the completion of raising the pick-up arm 5 and the rest position, as well as switches 63 and 6 for detecting the closed state and open state of the player body.
4 is also provided.

Figure 12 shows the song interval sensor section 5 in Figure 10.
FIG. 4 is a circuit diagram showing a specific example of No. 4; In this figure,
The song interval sensor 46 includes a single light emitting element 49 and two light receiving elements 50a and 5 as explained in FIG.
The light receiving elements 50a and 50b each receive the reflected light from the disk 6 and generate an output according to the amount of the received light. The two sensor outputs are amplified by an amplifier circuit 65 including operational amplifiers OP ₁ and OP ₂ and then supplied to a differential amplifier circuit 66 , and one sensor output is also supplied to an AC amplifier circuit 67 . The two sensor outputs obtained at the output end of the amplifier circuit 65 have waveforms as shown in FIG. 13a. In FIG. 13a, A indicates a track interval, B indicates an introduction groove, and C indicates a lead-out groove. The differential amplifier circuit 66 has an operational amplifier OP ₃ which takes the two sensor outputs as inverting and non-inverting inputs, and differentially amplifies the two sensor outputs to obtain an output waveform as shown in FIG. 13b. There is. It is clear from FIG. 13b that the differential signal between songs has a substantially S-shaped curve.

The differential signal becomes each non-inverting input of an operational amplifier OP ₄ configuring the inter-track comparator 68 and an operational amplifier OP ₅ configuring the zero-cross comparator 69 .
The reference level V _TH is present at the inverting input of operational amplifier OP ₄ .
is applied, and the reference level V _TH changes according to the sensitivity selection by the sensitivity changeover switch 70, and also changes according to the up and down movements of the pickup arm 5 even at the same sensitivity. This is done so that even if the amount of light received by the light receiving elements 50a, 50b of the song interval sensor 46 changes when the song is up or down, it is possible to reliably discriminate between songs and tone grooves by changing the reference level V _TH . The reference level is set by turning on and off the switch means 71 in accordance with the elevator operation of the pick-up arm 5.
V _TH switching is performed. The output of the operational amplifier OP ₄ is sent to the system controller 51 as an inter-song signal.
(terminal 15 in FIG. 11).

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

FIG. 14 is a circuit diagram showing a specific example of the DD drive system 19 in FIG. 10. The DD drive system 19 is
Drive coils 25a and 25b connected in series,
It is comprised of a horizontal drive circuit 73 that supplies a drive current to this drive coil, a speed detection coil 26, and an amplifier circuit 74 that amplifies the minute detection voltage of this detection coil. The horizontal drive circuit 73 includes a differential amplifier 75 consisting of an operational amplifier _OP8 and an operational amplifier.
The operational amplifier OP ₈ is composed of an inverter 76 with a gain of 1, and the inverting input terminal of the operational amplifier OP ₈ receives the band servo signal from the inter-track sensor section 54, and the non-inverting input terminal receives the speed detection signal amplified by the amplifier circuit 74. A speed servo signal from the coil 26 is applied, and the difference between the two reference voltages is amplified and the drive coil 25
By supplying current to a and 25b, the pick-up arm 5 is driven while controlling its speed. The band servo signal and the speed servo signal are sent to the differential amplifier 7 by switch means 77 and 78 which are turned on and off according to control from the system controller 51, respectively.
5 as needed. The amplifier circuit 74 includes an operational amplifier _OP10 , which amplifies the minute amount of power generated by the speed detection coil 26 according to the rotational speed of the pickup arm 5, and outputs it to the horizontal drive circuit 73 as a speed servo signal. In the amplifier circuit 74, _VR1 is a volume for offset adjustment.

Here, the band servo operation will be explained.
As explained based on FIG. 13b, the differential output of the differential amplifier circuit 66 in the song interval sensor section 54 exhibits an S-curve characteristic as shown in FIG. 15 with respect to the song interval, and this differential output becomes the band servo signal. If the needle tip 48 is now moved to the outer periphery by x [mm] with respect to the center of the song, a band servo signal of V [v] is generated. In response to this signal, 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 pick-up arm 5 reaches the top of the song interval during program play and ends when the down is completed.

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

In FIG. 14, a cancel coil 80 is integrally provided with the drive coil 25b and is connected in series with the speed detection coil 26. This cancel coil 80 increases the S/N of the output of the speed detection coil 26 by canceling noise components generated by the drive coils 25a and 25b.
This is to improve the stability of the speed servo. That is, when a current is passed through the drive coils 25a and 25b to drive the pickup arm 5, magnetic flux is generated by this current and the speed detection coil 26
An alternating current flows through the motor and becomes a noise component, but by providing the cancel coil 80 in series with the speed detection coil 26, the alternating current component can be canceled.
A variable resistor VR ₂ is connected in parallel to the cancel coil 80, and the cancel coil 80 has a configuration in which the amount of cancel can be varied by the variable resistor VR ₂ .

FIG. 16 is a circuit diagram showing a specific example of the address sensor section 53 in FIG. 10, which includes a light emitting section 53A having four light emitting diodes and a light receiving section having four phototransistors arranged opposite to these light emitting diodes. Address A, B by 53B
Sensors 32a, 32b, DD area sensor 3
4 and an end area sensor 35, and a pick-up plate 27, which is interlocked with the pick-up arm 5, rotates through the gap between the light emitting part 53A and the light receiving part 53B. Each output from the light receiving section 53B is sent to inverters 82 to 85 that constitute the waveform shaping circuit 81.
The signal is waveform-shaped and output to the disk 6 at the timing shown in FIG. 17 during the lead-in operation of the pickup arm 5. The end area signal a is sent to the terminal 10 of the system controller 51 at address A.
Signal b is connected to terminal 12, address B signal c is connected to terminal 13
, the DD area signal d is applied to the terminal 11, respectively. The role of each sensor is as explained in FIG.

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

First, Figure 18A and 18 show the operation when playing a program by specifying the 3rd track → 1st track on a 30cmLP disc.
The explanation will be based on the timing chart in Figure B.
It is assumed that the disc 6 has already been set, the player body is in the closed state, and the pick-up arm 5 is in the rest position. To set a program, turn on the power at time _t1 , turn on the music selection key "3" on the operation panel 2, and the light emitting diode (hereinafter referred to as
(abbreviated as LED) "3" (u) lights up (actually 1
(blinks twice and then lights up), indicating that the third song has been programmed. Next, when the song selection key "1" is turned on, the LED "1" (v) lights up in the same way. If you make a mistake in setting the program, turning on the stop key will clear the program, so you can set it again. After completing the program set,
When the start key is turned on at t ₂ , 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, the LED "start" (w) lights up to indicate the start of auto lead-in, and at the same time, the rest position detection switch 44 (a) is reversed.

Pickup arm 5 continues the lead-in,
At time _t3 when the needle tip 48 reaches the vicinity of the center spindle (near the center of the disk), the output o of the DD area sensor 34 is inputted to the terminal 11 of the system controller 51 at H level, and in response, the output o of the DD area sensor 34 is input to the terminal 11 of the system controller 51. and 28(m) are each at L level.
The DD drive system 19 is operated and the DD drive range is entered from here. Mechanical drive system 7 after entering the DD drive range
is released, and at this point the drive system of the pick-up arm 5 is transferred from the mechanical drive system 7 to the DD drive system 1.
Switch to 9. Even after the latch is released, the mechanical drive system 7 remains
The operation continues in the lead-in direction in advance of the DD drive system 19, and the cam portion 8a of the rotating member 8 turns off the ascent completion detection switch 42, and the output f of this switch 42 is inputted to the terminal 39 at H level. In response to this, terminal 8(h) transitions to H level and terminal 9(j) transitions to L level, rotating motor 9(j) is reversed in the lead-out direction, and the point in time when the ascent completion detection switch 42 is turned on again. At this point, terminals 8(h) and 9(j) become H level, the rotating motor (j) is stopped, and the lift completion detection switch 42 waits in the ON state.

While the high-speed lead-in operation by the DD drive system 19 continues, in the system controller 51, the address A sensor 32a(p) and B sensor 32 input to the terminals 12 and 13 from time _t3 .
Address counting is started based on the pulse signal from b(q), and a search is started to register between songs at time _t4 when a predetermined address is reached. Then, when the pick-up arm 5 is raised (during a search), the song interval signal s inputted to the terminal 14 from the song interval sensor section 54 and inputted to the terminal 15 in response to the song interval registration permission signal r is taken in, and Addresses are registered sequentially from between songs. At the time t5 when the pick-up 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 performed by adding, for example, 3 to the address indicating the drop position corresponding to the disc size of 17 cm, 25 cm, and 30 cm, and the address of the last registered song (the outermost song) registered between songs at the time of search. This is done by sequentially comparing as shown in the flowchart of FIG. 19, and if the relationship of last registered song address≦dropping position address+3 is established, then the actual disk size is determined from the dropping position. In addition, the address of each song near the last registered song registered between songs during the search is compared with the value of descending address -5 (5th address before the descending position) determined by size judgment, and each song near the last registered song is compared. If the relationship of address ≧ descending address - 5 holds true, the registered song is modified so that the song is not considered as a song and is deleted.

After the size determination is completed, the system controller 51
terminal 27(l) becomes L level and terminal 28(m) becomes H level (terminal 26 remains at L level), the driving direction of the DD drive system 19 is reversed, and as a result, the pick-up arm 5 returns to the first program. song 3
The robot moves toward the song at high speed and starts detecting the third song. At this time (time t ₅ ), at the same time, terminal 4(d)
goes to L level, starts the phono motor 55, and rotates the turntable 3(e). In addition, the LED "3" (u) that was in the lit state repeats blinking from time _t5 until the end of the performance of the third song. To explain the song interval detection operation according to the flowchart of FIG. 20, the needle tip 48 of the pick-up arm 5, which moves at high speed toward the inner circumference of the disk, reaches, for example, address 4 (registered address + 4) before the registered address of the third song. When it arrives (time t ₆ ), the terminal k becomes H level and the moving speed of the arm becomes low. And in low speed driving state, 3
When the song interval is detected from the front of the song, and the song inter-song signal s from the song-interval sensor unit 54 is input to the terminal 15, the system controller 51 detects the rising edge of the pulse (time t ₇ ) and sends it to the terminal 27. (l) is set to H level to stop the DD drive system 19, and
Turn off the LEDs ``Start'' (w) and ``Up'' (y) that were lit up until then. At the same time, terminal 8(h) is
level, and the rotary motor 9(j) of the mechanical drive system 7, which has been in a standby state, is operated to start the elevator down operation. At this time, terminal 3(c) is also L.
level and sets the collector of the transistor Q ₂ (shown in the 11th figure) to the H level, thereby making the switch means 77 (shown in the 10th and 14th figures) conductive, turning on the band servo, and controlling the band from the sensor section 54 between songs. The pickup arm 5 is driven in a horizontal plane by a DD drive system 19 in response to a servo signal (a differential signal of the outputs of two inter-track sensors).
With this band servo, even if the disk is eccentric, it is possible to follow the deviation between songs as the disk rotates, and lower the needle tip 48 of the pickup arm 5 to position it at the center of the song.

The elevator down operation continues, and at time _t8 , the cam portion 8a (shown in the third figure) of the rotating member 8 turns on the descent completion detection switch 43, and when its output (g) becomes L level, the terminal 9(i) also becomes L level. level, the rotary motor 9(j) of the mechanical drive system 7 stops, the down operation is completed, and the performance of the third song begins. At the same time, the terminal 3(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 (becomes L level).
The output of the buffer 86 also goes to 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 inter-song sensor section 54 (12th
Since the transistor Q ₄ in the circuit (see figure) is turned off, the switch means 71 becomes conductive, and by switching the reference level V _TH of the operational amplifiers OP ₄ and OP ₇ , the sensitivity up/down switching of the inter-song sensor section 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 becomes the L level, and the switch means 78 (10th and 14th figures shown)
is brought into a non-conducting state to cut off the speed servo signal from the speed detection coil 26 in the DD drive system 19 to the horizontal drive circuit 73, thereby turning off the speed servo. At the same time, the output of the buffer 89 goes to the L level, so that the voltage is passed through the resistors R ₁ , R ₂ , R ₃ and the diode D ₁ in the drive voltage generation circuit 79 (shown in Figure 11).
Differential amplifier 75 of DD drive system 19 (shown in Figure 14)
The voltage balance between the inverting input terminal and the non-inverting input terminal is slightly disrupted to determine the amount of anti-skating during performance.

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

When the third song is played, and slightly before the end of the performance, for example, at address 2 before the registered address of the fourth song, the system controller 51 connects the terminal 14,
At step 15, the system enters a standby state for inputting the zero-crossing signal r and the inter-song signal s. In this state, an H level zero cross signal r is sent to the terminal 14 of the system controller 51.
is input and one positive pulse, which is the inter-track signal s, is further input to the terminal 15, and at the timing of the rise of the zero-crossing signal r, the system controller 51 causes the needle tip to move between the third and fourth tracks. The arrival is detected (time point r ₉ ). At time _t9 when the end of the performance of the third song is detected, an H-level muting signal b is output from terminal 2, turning on transistor _Q3 , thereby turning on muting relay 88 and cutting off the audio signal system. At the same time, the sensitivity of the song interval sensor section 54 is switched to UP, and the speed servo of the DD drive system 19 is turned on. At this time the LED
"Up" (y) lights up, and the LED "1" that was lit
(v) flashes until the first song is played. 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, the elevation up operation is started. At this time, the rotating member 8 rotates to turn off the descent completion detection switch 43(g).

When the rotating member 8 continues to rotate and the ascent completion detection switch 42(f) is turned on (time _t10 ), the terminal 9(i) becomes H.
level, the rotary motor 9(j) stops and completes the elevator up operation, and at the same time the terminal 26
and 28 becomes the L level, the mechanical drive system 7 operates, and the pick-up arm 5 moves at high speed toward the outer circumference toward the first song. When the pick-up arm 5 passes between the first songs (30 cm lowered position) and arrives at a place 4 addresses past the registered address of the first song (outside the outer edge of the disk) (time t ₁₁ ), the terminal 26 of the system controller 51 is H level, terminal 2
7 becomes L level, terminal 28 becomes H level, and DD
The drive system 19 reverses the drive direction and moves the pickup arm 5 toward the first song at low speed.
Then, from the time _t12 when the set address of the first song is reached, the performance of the first song begins through the same process as when playing the third song. However, for the first song, the band servo is not performed at the registered address, but it is vertically lowered without band servo at a lowering position address that corresponds to each disk size that has been set in advance.

In the same manner as in the case of the third song, the end of the performance of the first song is detected (time _t13 ), and the elevation up operation is completed. All programs have finished, so
At the time _t14 when the ascent completion detection switch 42 is turned on,
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 pick-up 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 _t15 when the pick-up arm 5 reaches the rest position and the rest position detection switch 44 is turned on, the terminal 9 of the system controller 51 becomes H level, the rotary motor 9 of the mechanical drive system 7 stops, and the pick-up arm 5 It enters a standby state at the rest position and ends the program performance.

Next, operations during performance by manual operation will be explained based on timing charts shown in FIGS. 21A and 21B. It is assumed that the loading section is initially in the closed state, and when the "open/close" key is turned on at time _t1 , the terminal 6 of the system controller 51 goes to the L level, the loading motor 60 begins to rotate in the open direction, and the slide The base 4 protrudes toward the front as shown in FIG. 1b. Continue the open operation and slide base 4
turns on open detection switch 64(e) at time _t2 , terminal 6 of system controller 51 transitions to H level, stops loading motor 60, and completes the open operation. If the open detection switch 64 is not turned on even after a predetermined period of time, for example 25 seconds, has elapsed since time _t1 , the motor automatically stops and stands by at that location (fail safe).

Place the disc on turntable 3 and set the time
When the "arm manual set" key is turned on at _t3 , the terminal 19(t) of the system controller 51 becomes L level, and in response, the terminal 8(j) becomes L level, and the rotation motor 9 of the mechanical drive system 7 (l) starts rotating in the lead-in direction, and the pick-up arm 5 starts leading-in. At this time, the terminal 4(c) of the system controller 51 also becomes L level, causing the phono motor 55 to rotate. Thereafter, the pick-up arm 5 continues the lead-in in the same way as the audio lead-in during program playback, and at the time point _t4 when the output q of the DD area sensor 34 occurs, the terminals 26(m) and 28(o) of the system controller 51 each go low. level, the DD drive system 19 is operated, and the drive system is switched from the mechanical drive system 7 to the DD drive system 19.
The mechanical drive system 7 precedes the DD drive system 19 and stands by just before the elevator down operation. The pick-up arm 5 continues the lead-in at high speed, and at the time _t5 when the rising edge of the 103rd pulse of the output r of the address A sensor 32a is input to the terminal 12 of the system controller 51, the terminal 26(m) becomes H. level, and the moving speed of the pick-up arm 5 becomes low.

The pick-up arm 5 continues to lead-in at a low speed, and at the time _t6 of the rise of the 105th pulse of the address A sensor 32a corresponding to the 30 cm lowered position, the terminal 28(o) of the system controller 51 is connected.
becomes H level, the DD drive system 19 stops, the pick-up arm 5 stops in the raised state, and enters a standby state for manual performance. Next, when the "elevation" key is turned on, terminal 8(j) of the system controller 51 goes to L level, and the mechanical drive system 7
The rotary motor 9(l) rotates in the down direction and starts the elevator down operation. At this time, the LED "up" (w) that had been lit until then goes out.
When the cam portion 8a of the rotating member 8 of the mechanical drive system 7 turns on the lowering completion detection switch 43(i) and completes the lowering operation (time t ₈ ), the system controller 51
Terminal 9(k) becomes L level, and mechanical drive system 7 stops. At this time, mute signal b, which was output from terminal 2 at the same time, disappears (becomes L level),
Muting relay 88 is turned off and enters a performance state.

During performance, if you keep pressing the "Start" key at time _t9 , you will move to the locate-in operation. First, time t ₉
Then, the terminal 8(j) of the system controller 51 goes to the H level, and the rotary motor 9(l) of the mechanical drive system 7 rotates in the upward direction to enter the elevation up operation. Simultaneously LED "start" (v) and "up"
(w) lights up, and an H-level muting signal b is output from terminal 2, turning on the muting relay 88 and interrupting the performance. When the ascent completion detection switch 42 (h) is turned on (time t ₁₀ ), the terminal 9 (k) of the system controller 51 becomes H level, the rotation motor 9 (l) of the mechanical drive system 7 is stopped, and the ascent completion state is established. Then, terminal 27(n) becomes L level,
The DD drive system 19 is operated to move the pick-up arm 5 toward the inner circumference at low speed, resulting in a locate operation. The LED ``Start'' (v) flashes while the ``Start'' key is held down from time t ₁₀ when the locate operation begins. When you keep pressing the "Start" key and release it at an arbitrary position (time _t11 ), the terminal 27(n) of the system controller 51 becomes H level and the DD drive system 19 stops, so the pick-up arm 5 stops in the raised state. At the same time, the LED "Start" stops blinking. When the "elevation" key is turned on (time _t12 ), the instrument goes through an elevation down operation in the same manner as the manual lead-in, and enters the performance state at time _t13 .

In addition, when performing a locate operation, please press the "Stop" button.
If you keep pressing the key, after the elevation up operation is completed, terminal 2 of the system controller 51 is
8(o) becomes L level and pick up arm 5
moves toward the outer circumference at low speed (locate out). Also, regardless of whether it is up or down,
When the pick-up arm 5 exceeds the DD drive range, the mechanical drive system 7 operates to automatically return the pick-up arm 5 to the rest position (forced return). This forced return is not limited to the case where the DD drive range is exceeded, but the range can be arbitrarily set and it can be performed when the range is exceeded.

When the performance continues and the needle tip 48 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 A and address B sensors 32a and 32b are inputted to the terminal 10 of the system controller 51.
Based on the outputs r and s, end detection is performed when the needle tip 48 enters the lead-out groove and the feeding speed increases. At time ₁₄ when the end is detected, terminal 8(j) of the system controller 51 becomes H level (terminal 9 remains at L level), and the elevation up operation is started. At this time, the LED "Up" (w) lights up,
Also, the muting signal b is output, and the muting relay 88 is turned on to cut off the audio signal system. The ascent completion detection switch 42(h) is turned on (at the time
t ₁₅ ), even when the up operation is completed, the logic at the terminals 8 and 9 of the system controller 51 is maintained, and the mechanical drive system 7 causes the pick up arm 5 to start auto-return in the rest direction. At time _t16 when the pick-up arm 5 returns to the rest position, the rest position detection switch 44a is turned on, and at time _t17 , after a predetermined period of time has elapsed from time _t16 , terminal 9(k) of the system controller 51 becomes H level and the mechanical drive system 7 and complete the auto return. At this time, the terminal 4(c) of the system controller 51 becomes H level and the phono motor 55 is stopped.

When the "Open/Close" key is turned on at time _t18 , the terminal 7(g) of the system controller 51 becomes L level, and in response, the loading motor 60 rotates in the closing direction, moving the slide base 4 into the main body. Drive to store in. When the storage is completed and the slide base turns on the close detection switch 63d (time _t19 ), the system controller 51 responds by setting the terminal 7(g) to H level, stopping the loading motor 60, and completing the closing. This means that all operations are on standby.

In program performance and manual performance,
When performing so-called de-syncing, in which the playback sound is automatically recorded onto a tape deck (not shown), first connect the synchro output terminal 62 (shown in the 11th diagram) of this system to the remote pause terminal of the tape deck, and then is in a recording pause state, and the synchronization switch 61 of the system is turned on. From the terminal 25 of the system controller 51, as shown in FIG. 18B, when the program is played, time points _t7 , t10 _{, t10} ,
At _t12 and _t14 , synchro output t of L level is generated. Because Detsuki repeats pause←→recording every time one pulse is input to the pause input, the pause is released only during performance, and only the playback sound can be recorded automatically. During manual performance, as shown in FIG. 21B, synchronized output u is generated at time points t ₇ , t ₁₀ , t ₁₂ and t ₁₅ , and the recording state is automatically entered only during performance.

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

As described above, in the present invention, during the lead-in operation of the pick-up arm equipped with the address sensor and the song interval sensor that detect the arm position, the output of the address sensor is searched based on the output of the song interval sensor. The address is set based on the address and the interval between songs is registered, and during song selection operation, the pick-up arm is driven at high speed until it reaches the vicinity of the designated address, and after reaching the vicinity of the designated address, the pick-up arm is driven at low speed. At the same time, the intervals between songs are detected based on the output of the inter-song sensor, and this allows the specified intervals to be detected quickly and reliably, allowing for speedy program performance.

In particular, in the present invention, after the pick-up arm is moved at high speed to the vicinity of the specified song interval, the song interval sensor is configured to actually detect the specified song interval, so that only address management is possible. This makes it possible to detect the song interval more reliably than when detecting the stop position of the pickup arm. In other words, if there is a slight discrepancy in the correspondence between songs and addresses, it may not be possible to detect the gaps using address management alone, but according to the present invention, the gaps can be detected accurately. This means that you can start playing between songs.

In other words, since the song interval is finally detected by the song interval sensor, the correspondence between the song interval and the address only needs to be accurate enough to detect the vicinity of the specified song interval. It is not necessary to set the correspondence relationship strictly, and thus the design becomes easier.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the record player according to the present invention, in which a shows the closed state and b shows the open state, FIG. 2 is a plan view showing the operating area of the pick-up arm, and FIGS. The figure is a schematic plan view showing the drive mechanism of the pick-up arm and a perspective view of each part before assembly, Figure 5 is a plan view showing the positional relationship between the pick-up plate and the address sensor section, and Figure 6 is a schematic diagram showing the pick-up arm assembly. 7 is a schematic perspective view showing the head shell section, FIG. 8 is a diagram showing the positional relationship between the song interval sensor and the song interval, and FIG. 9 is a diagram showing the output characteristics of the song interval sensor during the song interval. FIG. 10 is a block diagram showing an example of the control section, FIG. 11 is a circuit diagram showing a specific example of a part of FIG. 10, FIG. 12 is a circuit diagram showing a specific example of the inter-song sensor section, and FIG. The waveform diagram of each part in Fig. 12, and Fig. 14 is the DD drive system 19.
15 is a circuit diagram showing a specific example of the band servo, FIG. 16 is a circuit diagram showing a specific example of the address sensor section, and FIG. 17 is a diagram showing the relationship between songs and band servo signals. FIGS. 18A and 18B are timing chart diagrams showing the outputs of each sensor in FIG. 21A and 21B are flowcharts for explaining the operation of detecting between songs, and FIGS. 21A and 21B are timing charts for explaining the operation during manual performance. Explanation of symbols of main parts 2...Operation unit, 5...
Pickup arm, 7... Mechanical drive system, 8...
Rotating member, 9... Rotating motor, 11... Latch mechanism, 19... DD drive system, 20... Magnet,
25a, 25b... Drive coil, 26... Speed detection coil, 27... Pick up plate, 32
a, b... Address A, B sensor, 34... DD area sensor, 35... End area sensor,
42...Ascent completion detection switch, 43...Descent completion detection switch, 46...Song interval sensor, 51...
...System controller, 53...Address sensor unit, 60...Loading motor, 70...Sensitivity changeover switch, 71, 77, 78...Switch means, 79...Drive voltage generation circuit, 80...Cancel coil, 87 ...Muuting circuit.

Claims (1)

[Claims] 1. During lead-in operation of a pick-up arm equipped with an address sensor for detecting the arm position and a song interval sensor, the address is set based on the output of the address sensor while searching for a song interval based on the output of the song interval sensor. During the song selection operation, the pick-up arm is driven at high speed until it reaches the vicinity of the designated address, and after reaching the vicinity of the designated address, the pick-up arm is driven at low speed and the interval between the songs is registered. A song interval detection method characterized by detecting a song interval based on the output of a sensor.