JPS6013301A - Reproducing method of sound signal - Google Patents

Abstract

PURPOSE:To attain muting stably and precisely by releasing the muting of a pickup output when an optical detecting means detects that a tone arm lifting means reaches a position corresponding to the most descended position of the tone arm. CONSTITUTION:When a motor driving circuit is closed in case of auto-leading- in, a small gear 93 is rotated and a large gear 1 is also rotated. When the large gear 1 is rotated, a sliding plate 10 having a pin 11 following a cam groove 1a of the large gear 1 starts to rotate in the arrow F direction and a cam body 69 having a cam surface 69b for lifting the tone arm is rotated by a cam surface 12 formed on the side of the sliding plate 10. When the cam body 69 is rotated, a light shielding plate 100 attached to the cam body 69 is also turned unitedly. A sensor (photocoupler) 103 detects said turning, and when detecting the cam body 69 reaches the position corresponding to the most descended position of the tone arm, the muting of the pickup output is released.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a record player.

(B) Prior art To prevent the noise (shock sound) that conventionally occurs in a record player when the playback needle attached to the pickup at the tip of the tone arm engages or disengages from the record during lead-in or lead-out. For this reason, I use muting.

Such ON/OFF control of muting is generally performed electrically or mechanically. muting is turned off by detecting this. Also, the time it takes for the signal path to recover after muting off (recovery time) is set to be longer than the time it takes for the tone arm to descend from the raised position and for its playback meter to engage with the record. The above muting is achieved by doing this. Further, during auto return, muting is turned on in response to a return operation or a return trigger signal is applied, and muting is turned off when it is detected that the tone arm has reached the rest position. .

However, in such conventional record players, muting-off detection is performed electrically or mechanically as described above, which causes variations in the detection.

Therefore, in such a conventional method, muting is released before the playback needle and the record are engaged, and the shock sound when the playback needle and the record are engaged is emitted from the speaker. Even though the reproduction needle and the record are engaged and the desired music signal is being reproduced, muting is still occurring, and there is a risk that such a music signal will not be emitted from the speakers. there were.

(c) Purpose of the Invention In view of the above-mentioned points, an object of the present invention is to propose a record player that stably and reliably applies muting.

B) Structure of the Invention In order to achieve the above object, a tone arm, a tone arm elevating mechanism for elevating the tone arm, a detection means for optically detecting the position of the tone arm elevating mechanism, and at least a detection means are provided. Similar to the muting circuit section that mutes the output signal from the pickup attached to the tip of the tone arm based on the detection output from the detection means, the tone arm lifting mechanism corresponds to the lowest position of the tone arm in the detection means. The configuration is such that when it is detected that the position has been reached, the muting circuit section cancels the muting of the pickup output.

(E) Embodiment FIGS. 1 and 2 are diagrams provided to explain the basic operation of the record player according to the present invention. In the figure,
(1) is a large gear driven by a small gear attached to a turntable drive motor (not shown), (1a) is a cam groove formed in the large gear (1), and (1) is a tone arm. A sliding plate that is driven in the lead-in/lead-out direction, I is a follower pin that is embedded in the sliding plate 1G and follows the cam groove (1a) of the large gear (1), and α2 is a follower pin that is installed on the sliding plate I]. 0 is the through hole provided between the sliding plates, I is the cutout provided between the sliding plates, 051 (18αηtig is the sliding plate a1
The operation selection lever, the first rotation lever, and the second
This is a rotating lever and a third rotating lever.

In addition, the first and second rotating levers (161 (Lη) are screwed between the sliding plates and rotate together, but they also rotate together. The lever is a switch drive member, It is rotatably attached to the sliding plate (■) by a screw C11) and is constantly biased in the direction of the arrow by a spring C13.

(AO is a start/cut lever that is slid by a plunger that is activated when the start/cut switch (Sl) is operated, and its tip (4υ is the contact point of the switch drive member when the start/cut switch is operated. Contact piece (30a)
Press. Further, (40a) is a pressing part that is provided on the start/cut lever (4G) and presses the trigger lever (2) when the start/cut switch is operated.

Up to now, each member provided on the sliding plate 11α has been described, and next, each member provided on the mechanism chassis (4) will be described.

(5G is the shaft 61 installed in the mechanism chassis (4))
The first switch lever is pivotally connected to the first switch lever), which is engaged with the switch drive member (to) when the switch drive member is positioned by the spring 0, that is, is in a stopped state; In this state, it is still in contact with a stopper 524 provided on the mechanism chassis (4).

53 is the second switch lever, and its shaft (53a) is the first switch lever 1! It is associated with one end of the iG and is rotatable around a lever shaft (53B). A switch suppressing part (55b) for pressing the switch (3) is provided at one end of the second switch lever board, and a contact part (530) is provided at the other end. Chassis [4]
Further, a second switch lever contact member 4 is rotatably supported on the shaft.

In the stopped state, the second switch lever abutting member 64) is set at the position shown in FIG. 2 by means of a rotating pin (SOa) installed in the tone arm lever (2), which will be described later.

In this state, the cam part (54a) of the second switch lever contact member 6a and the contact part (54a) of the second switch lever
3(ri) is in the contact state, so the switch is suppressed @(53
In b), the operating piece of the normally closed switch (3) is pressed, and the switch (3) is in the open (off) state. ((to) is rotatably provided with respect to the chassis (4), and the operation selection lever (151) attached to the sliding plate 1 [1] selectively contacts and rotates and contacts the chassis (4). The contact lever 61) which rotates the 1st rotary lever αe attached to the sliding plate during contact rotation is rotatable with respect to the chassis (4) and is selected by the operation selection lever a9. This is an operation determining lever that determines the operation, and is constantly biased in the direction of arrow B by a spring (not shown).
) The operation selection lever σS is rotatably attached to a shaft installed in the
is always regulated to the lead-in operation selection position.

[F]■ is a code size selection lever that is rotatable with respect to the chassis (4) and has a cam surface (13) at the sliding plate opening and a sliding piece (65a), and its shaft portion (65b ) is formed with sulin) (65c).

When the first code size selection lever (65) is rotated as the sliding plate opening slides, its shaft (661L) is fitted into the shaft (65b) of the second code size selection lever (65). The second record size selection lever (66) is also rotated.

(67) is a record size setting lever that is rotated to a desired record size position by the record size switching operation, and includes a second record size selection lever (the bent surface (66) of 60).
b) has a locking pin (67a) that engages with the locking pin (67a). or,
The rotation range of the record size setting lever (67) is restricted by stoppers (68a) (66b). Kasumi is rotatable with respect to the chassis 14) and has a sliding piece (69&) that slides on the cam surface ti2 of the sliding plate opening, and an arm lifter (see figure) that moves the tone arm (not shown) up and down. Cam surface (69b) on which the shaft (70) of (not shown) slides
A cam body having a spring (71) and a sliding piece (65a
) is urged in the direction of pressure contact with the cam surface αa of the sliding plate opening. (72) is a rotating member that is rotated by the cueing lever (73) during manual cueing operation, and a spring (74) is wound around the center portion (72a). (8
0) is a tone arm lever attached to the tone arm shaft, a rotating pin (aOa) that rotates the second switch lever contact member (goods), and a third rotating lever σ during lead-in operation.
a retaining pin (sob) that engages with the cut-out part (18a) of ε and engages with the cut-out part α4 of the sliding plate U during lead-out operation;
A contact bin (80C) that comes into contact with the side of the record size setting lever (goods) during lead-in operation, and a suppression bin (80d=) that presses the trigger lever (2) at the end of record playback.
have.

Also, the tone arm lever (so) has two levers (81
) (82) It is structured as follows. Adjustment between the levers is performed by an eccentric shaft (83).

3 and 4 are diagrams showing the periphery of the large gear of the record player according to the present invention.

In the figure, (90) is a chassis in which a shaft (90a) for rotatably attaching a large gear (1) is installed, (91) (9
2) are first and second levers rotatably mounted on the large gear (1), and when the trigger lever (2) is operated,
The cut and raised piece (91a) of the No. 1 lever (91) is the small gear (93)
The large gear (1) is engaged with the claw portion (93&) of the large gear (1). (94) is a guide lever that follows the cam (1b) formed on the large gear (1), and is always attached in the direction of pressure contact with the cam (1b) by a spring stretched between it and the chassis (90). Forced. In addition, when the large gear (1) is stopped, the guide lever (94) is inserted into the recess (1) of the cam (1b).
b'). (95) is a switch placed on the chassis (90), and the guide lever (94)
N-OFF controlled. Since such a switch (95) is always ON when the large gear (1) rotates, it is turned down as a mechanism operating state detection switch.

FIG. 5 and FIG. 6 are diagrams showing the main mechanism of the present invention. In the figure, (100) is a fan-shaped light shielding plate attached to the cam body haze, (101) is a bracket attached to the mechanism chassis (4), and (102) is a bracket) (
A mounting plate attached to the ICN) with a through hole (102
&)have. By inserting a jig into the through hole (102a) and rotating the jig, the position of the mounting plate (102) relative to the cam body (roller) can be adjusted. (1
05) is a sensor attached to the mounting plate (102),
It consists of a photocoupler consisting of a light emitting element and a light receiving element.

Incidentally, the light shielding plate (100) is configured to move between the light emitting element and the light receiving element of the sensor (103).

FIG. 7 is a circuit diagram of a record player according to the present invention.

In the figure, (Sl) is a start/cut switch, '
(110) is when the rest switch is turned on (i.e.
(N1) sets the input side of the inverter (IV3) to the L level when the tone arm leaves the armrest), and (N1) sets the input side of the inverter (IV3) to the L level when the tone arm leaves the armrest. A second bypass means (112) is a flip-flop (FF-2) for setting the L level.
) is the first pulse generating circuit which generates a pulse when the Q output is at H level.The pulse is applied to the plunger (113) for sliding the start/cut lever. (114) is a second pulse generating circuit that generates a pulse in response to closing of a switch (95) provided near the large gear (1); (OR-1) is a second pulse generating circuit (114 ) and the Q output of the flip-flop (FF-1).The output is used as a synchronization signal with the cassette tape deck.

Next, the operation of the record player having such a configuration according to the present invention will be explained.

(1) Auto lead-in In the circuit shown in Figure 7, when the start/cut switch (Sl) is operated (closed), the
AND-2) because the two-man power is at KH level (in addition,
The flip-flop (FF-2) is reset by the initial pulse from the power supply when the power is turned on), NAN
D game) (NAND-2) outputs an L level signal (
(See Figure 8(d)).

In this way, the output signal of the NAND gate (NAND-2) is L.
When it comes to the level, the single power of NOR game) (NOR-1) becomes H level, so NOR game) and (NOR-1) output an H level signal, and the flip-flop (FF-2)
(See Figure 8 (g) and (n)). 7 like this
When the lip flop (FF-2) is set, such 7
The Q output (H level) of the lip-flop (F, F-2) is applied to the first pulse generating circuit (112), and a pulse is generated from the first pulse generating circuit (112) (Fig.
)reference). Such a pulse is applied to the plunger (113) to energize the plunger (IL5). Therefore, the start/cut lever (AO) is moved in the direction of arrow C using the plunger (113). Also, the Q output of the flip-flop (FF-2) is determined by the OR game) (OR-
4), such an OR gate (OR-4) outputs an H level signal, and operates a muting circuit (not shown) with this H level signal.

Further, the L level output signal of the NAND gate (NAND-2) is applied to one input terminal of the NAND gate (NAND-1). (NAND game) (NAND-1
) inputs are the power supply voltage (
Since the NAND game) (NAND-4) outputs an H level signal, the flip-flop (FF-1)
(See Figure 8 (C) and (C)). The H level signal from the Q terminal of the flip-flop (FF-1) is applied to, for example, a cassette tape deck via an OR game (OR-1), and becomes a synchronization signal between the record player and the cassette tape deck. . By the way, when the plunger (113) is energized and the start/cut lever (a) moves in the direction of arrow C, the abutting piece of the switch drive member ■ (3oa ) and press the trigger lever (2) with the pressing part (4Oa) of the start/cut lever (41).
Press to rotate the trigger lever (2) in the direction of arrow G.

Start like this/cut lever! 40 tip (il)
When the contact piece (30a) of the switch drive member is pressed at , the switch drive member (2) is rotated in the direction indicated by the arrow, against the biasing force of the spring device. When the switch drive member rotates in the direction of the arrow in this manner, the restriction of the first switch lever 60 by the switch drive member (■) is released, so the switch (3) is turned on and the motor drive circuit (not shown) is turned on. When the small gear (96) is closed, the small gear (96) rotates.

By the way, at this time, by rotating the trigger lever (2) in the direction of arrow G, the first and second levers (91) on the large gear (1) are rotated.
) and (92) have been moved in the direction of arrow E in FIG.

The follower is connected to the cut-out (91a) of the No. 1 lever (91) and the small gear (
93) engages with the claw portion (93a) of the large gear (1).
) rotates.

When the large gear (1) rotates in this manner, the guide lever (94) that slides on the cam surface (1b) of the large gear (1) rotates in the direction of arrow H against the biasing force of the spring, and the switch is rotated. (95) is turned on. When the switch (95) is turned on, the H level signal from the power supply (+B)' is output from the OR game) (OR
-3) is applied to the 1 input terminal of the ON gate) (OR-3)
outputs an H level signal.

This H level signal is applied to the first pulse generating circuit (112), and prohibits the first pulse generating circuit (112) from outputting the signal.
This continues during the period in which the switch (95) is ON (that is, the period in which the mechanism is operating due to the rotation of the thick gear (1)) (see FIG. 8(b)).

When the large gear (1) rotates, a sliding plate 11+ having a pin (1υ) follows the cam groove (1a) of the large gear (1).
175 (slides in the direction of arrow F. Such a sliding plate (IL'I
When l slides in the direction of the arrow F, the operation selection lever (2) and the contact lever (m-) come into contact with each other, causing the abutment lever (A) to rotate in the direction of the arrow (2). By rotating the abutment lever in the directions of arrows f and p in 6■, the second rotating lever attached to the bottom surface of the sliding plate ll rotates. The second rotating lever (lη
also rotates clockwise. At this time, the second rotation lever (L7
) so that the pin (17a) installed in the second pivot lever a8 faces through the through hole (18b) provided in the second pivot lever a8.
The third rotating lever 0υ is rotated counterclockwise. That is, the cut and raised portion (18a) of the third rotating lever & is connected to the engagement beam (80b) provided on the tone arm lever (80).
Rotate to a position where it can come into contact with.

Therefore, when the sliding plate 11Q starts sliding in the direction of arrow F and the notched portion (18a) comes into contact with the engagement pin (80b), the tone arm lever (80) rotates counterclockwise. Then, the lead-in operation of the tone arm is performed.

By the way, the cam surface (69
The cam body 9 having b) is rotationally driven by a cam formed on the side surface of the sliding plate IG.

That is, when the sliding plate (11) slides in the direction of arrow F, it performs a cueing up operation, and when it slides in the direction of arrow F, it performs a cueing down operation.

Further, the record size selection lever can is also driven by the cam surface σ2 of the sliding plate 11[, and rotated by sliding in the direction of arrow F until it comes into contact with the protrusion (67a) of the record size setting lever (67). , At this position, press the tone arm lever (
By making contact with the pin (80e) of the SO), the lead-in position of the tone arm for each record size is set.

By the way, when the operation of the mechanism progresses and the guide lever (94) reaches the recess (1b') in the cam surface (1b) provided on the large gear (1) (that is, the rotation of the large gear (1) stops). ), the guide lever (94)
The suppression of the switch (95) by the switch (95) is released, and the switch (
95) is turned OFF (see FIG. 8(b)). When the switch (95) is turned off in this way, the inverter (IV2
An H level signal is output from the OR gate (OR-2) to which the signal from the switch (95) is applied via the switch (95) (see FIG. 8(1)). Such an H level signal is applied to the reset input terminal of the flip-flop (FF-1) (FF-2), and the reset input terminal of the flip-flop (FF-1) (FF-2)
-2) (see Figure 8 (e) and (n)).

Therefore, the output signal of the OR gate (OR-1) to which the Q output of the flip-flop (FF-1) is applied falls (see FIG. 8(h)). At the falling edge of the output signal of the OR gate (OR-j), the pause of the connected cassette tape deck is released and synchronized recording is started.

Also, the output signal of the OR gate (OR-4) to which the Q output of the free lobe flop (FF-2) is applied also falls, and muting is canceled (see (6) (-) in Figure 8). .

(11) Auto return After the auto lead-in operation explained in item (1) above, the record player continues to play the record and when the playback needle comes to play the innermost groove (leading groove), the tone arm lever ( 3) Press the Gar lever (2) and rotate the trigger lever (2) in the direction of arrow G. Therefore, as in the case of the auto lead-in described above, use the trigger lever (2) to move the first and second levers (91X92) in the direction of arrow E, and move the first lever (91
1) and the claw portion (95a) of the small gear (93).
) to rotate the dog gear (1).

When the large gear tl)# rotates in this manner, the right guide lever (94) that slides on the cam surface (1b) of the large gear (1) rotates in the direction of arrow H, turning on the switch (95). switch(
95) is turned on, an H level signal is sent from the power supply (+B) via the switch (95) to the second pulse generating circuit (
114), and a pulse is output from the second pulse generating circuit (114) (see FIG. 8). This pulse is applied to the cassette tape deck through the OR gate (OR-1), thereby stopping or pausing the cassette tape deck in the recording mode.

Furthermore, the rotation of the dog gear (1) causes the sliding plate JIG to slide in the direction of arrow F. However, at this time, the tone arm lever (
80) is rotated counterclockwise compared to the stopped state shown in Fig. 2, so the operation determining lever 61) is rotated by a spring (not shown).
It is rotated in the direction of arrow B by the bias of . As the operation decision lever [F] p rotates in the direction of arrow B, the shaft (l
In a), the operation selection lever a51 is rotated counterclockwise and is in the lead-out operation selection position.

Now, when playing a record, the retaining pin (80b) of the tone arm lever (80) faces the cutout (14) of the sliding plate 111 in the vicinity thereof.

Therefore, by sliding the sliding plate i11 in the direction of arrow F, the tone arm lever (80) is rotated clockwise in FIG. is returned to the rest position.

At this time, the cam body (69) is rotated as in the case of the auto lead-in operation described above, and the tone arm is in the raised position.

By the way, when the cam body (69) is rotated, the cam body (69)
9) also rotates together (see Figures 5 and 6). When such rotation is detected by a sensor (10!l) and the cam body (69) has rotated a little to a position corresponding to the lowest position of the tone arm, sensor (103) fiH
Outputs level signal.

2. The H level signal from the sensor (103) is applied to a muting circuit via an OR gate (OR-4) to mute the left and right channel signals of the backup.

Such muting continues until the tone arm reaches the rest position and is placed on the armrest stand.

Now, as mentioned above, since the operation selection lever is in the lead-out operation selection position, the operation selection lever stop and contact lever (60
The receiving part (SOa) of is never engaged. Therefore, the sixth rotating lever αε is not rotated to the position where it comes into contact with the engaging pin (sob) of the tone arm lever (80), and as a result, when the sliding plate U slides in the direction of the arrow F, No lead-in operation is performed. And the arrow F between the sliding plates
At the end of sliding in the direction, the cam body (69) rotates, the tone arm descends to the rest position, and the switch (3
) is turned OFF, the lead-out operation ends.

(iii) Cut operation 23 After the lead-in operation explained in section (1) is completed, turn the start/cut switch (S) of the record player in the playing state.
l), a fiL level signal is output from the NAND gate (NAND-2), and the NOR gate (NOR-2) outputs a fiL level signal.
1) (see Fig. 8(a), (d), and (g)).

Therefore, an H level signal is applied from the NOR gate (NOR-1) to the set input terminal of the flip-flop (FF-2), and the flip-flop (FF-2) is set (see FIG. 8(n) )reference).

When the flip-flop (FF-2) is set in this way, the Q output (H level) of the flip-flop (FF-2)
is applied to the first pulse generating circuit (112), so that the first pulse generating circuit (112) generates a pulse (see FIG. 8(n) (1)). The voltage is applied to the plunger ([3), the plunger (115) is energized, and the start/cut lever (40) is moved in the direction of arrow C. Therefore, the switch driving member (■) on the sliding plate is pressed against the spring C33. It is rotated in the direction of the arrow against the biasing force, and the switch (3) is turned on.

Also, when sliding the start/cut lever (4■ in the direction of arrow C), press the start/cut lever (4■)
Press the trigger lever (2) at a) to rotate the trigger lever (2) in the direction of arrow G.

By rotating the trigger lever (2) in the direction of arrow G, the first
The second lever (91) (92) moves in the direction of arrow E, and the cut-out (91a) of the second lever (91) and the small gear (93)
The large gear (1) is engaged with the claw portion (93a) of the
rotates. By such rotation of the dog gear (1), the tone arm is rotated to the rest position (same as the auto return operation explained in the ID section).

By the way, the Q output of the flip-flop (FF-2-) is also applied to the OR game (OR-4).
The pickup output is muted by the H level signal from OR-4. Now, since the switch (95) is turned on by the guide lever (94) as the large gear (1) rotates, the second pulse generating circuit (1
14) Yoshibalus will occur. Such a pulse is an OR game)
(OR-1) is applied to the cassette tape deck via 5, and at its startup, the cassette tape deck is stopped from the recording mode or set to the Bose mode.

As the large gear (1) continues to rotate, the guide lever (94)
is the recess (1) of the cam surface (1b) provided on the large gear (1).
When reaching b'), the switch (95) turns OFF,
The flip-flops (FF-1) and (FF-2) are reset (see FIG. 8(b)(c)(n)).

When the 7 lip-flop (FF-2) is reset in this manner, its Q output falls, so that the output of the OR gate (OR-4) also goes to L level and the simulation is canceled.

(1) Return operation based on the signal from the amplifier After the auto lead-in operation explained in section (1), when a control signal from the amplifier is applied to the record player in the playback state (see Figure 9 (a)) ), the second bypass means (f12) becomes conductive, and the input terminal of the inverter (IV3) is connected to the ground level (
lower to L level).

Therefore, the single input signal of the NAND gate (NAND-4) will not go to H level, and since the low input signal is at 6H level at this time, the output signal of the NAND gate (NAND-4) will not go to L level. After the L level signal is inverted to H level by the inverter (IV4), it is applied to the set input terminal of the flip-flop (FF-3Σ), and the flip-flop (FF-3) is set (FIG. 9). (
e) (see (n)).

On the other hand, the L level signal of the NAND gate (NAND-4) is also applied to the NOR gate (NOR-1) K, and sets the flip-flop (FF-2) (see FIG. 9(E)). Therefore, the Q output (H level) of the flip-flop (FF, -2) is applied to the first pulse generating circuit (112), and the first pulse generating circuit (112) generates a pulse (see FIG. 9). 0)). At the same time, 7 lipflops (F
The Q output of F-2) is applied to an OR gate (OR-4), and muting is applied at the output of the OR gate (OR-4). By applying such a pulse to the plunger (113), the plunger (113) becomes energized and moves the start/cut lever C4 in the direction of arrow C.

27 When the start/cut lever (41) moves in the direction of arrow C in this manner, the large gear (1) rotates as explained in sections (II) and (lii) above, and the tone arm is rotated to the rest position. .

Also, when the large gear (1) rotates, the guide lever (94
), turn on the switch (95), and turn on the switch (95).
The H level signal from 5) is sent to the second pulse generating circuit (11
4), but at this time the flip-flop (FF
-3) is set and the flip-flop (FF-
3) Q output (H level) is output from the second pulse generation circuit [11
4), the second pulse generating circuit (114
), no pulse is generated from OR gate (OR-1)
Since no H level signal is output from the cassette tape deck, the cassette tape deck is not controlled in any way (Fig. 9 ←) ←)
reference).

When the rotation of the large gear (1) progresses and the guide lever (94) reaches the recess (1b') in the cam surface (1b), the switch (
95) intersects with OFF. In this way, the switch (95) is turned OFF.
When it becomes F, the output signal of OR game) (OR-2) becomes H level, so the output signal of OR game) (OR-2) goes to ■ level, and such H level signal goes to the flip-flop (F
F-1) (FF-2) is applied to the reset terminal of the flip-flop (FF-1) (FF-2)
is reset (see <1> in Figure 9)).

Therefore, the output signal of the OR gate (OR-4) to which the Q output of the flip 70 tube (F'F-2) is applied falls;
Muting is canceled.

(V) Manual queuing rough/down 1st 2nd
When the cueing lever (73) is rotated in the stopped (playing) state shown in the figure, the rotating member (72) is activated by the spring (
The cam body (6) rotates due to the biasing force of the cam body (6
9) is rotated in the direction of arrow j to enter the rising state (queuing up). By the way, a light shielding plate (1oo) is attached to the cam body (69), and the light shielding plate (100)
- is placed between the light emitting element and the light receiving element of the sensor (103), so during cueing down (when the cam body (69) is located at the position corresponding to the lowest position of the tone arm) the light emitting element Since the amount of emitted light is set to be a little lower than the conduction level of the light receiving element, the cam body (69)
The light-receiving element becomes conductive by only a slight rotation of the
03) outputs an H level signal. In this process, the level signal is applied to the OR gate (OR-4) and muting is applied.1 In this muting, the cueing down operation is performed, and the cam body (69) corresponds to the lowest position of the tone arm. continues until the desired position is reached.

(f) Effects of the invention A tone arm, a tone arm lifting mechanism for raising and lowering the tone arm, a detection means for optically detecting the position of the tone arm raising and lowering mechanism, and at least a detection output from the detection means. a muting circuit section that mutes an output signal from a pickup attached to the tip of the tone arm based on the detection means, and the detection means detects that the tone arm lifting mechanism has reached a position corresponding to the lowest position of the tone arm. When this is detected, the muting of the big-up output by the muting circuit section is canceled, so that muting can be applied stably and reliably.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIGS. 1 and 2 are diagrams for explaining the basic operation of the present invention.
Figures 3 and 4 are plan and back views showing the periphery of the large gear, Figures 5 and 6 are views showing the main mechanism, Figure 7 is a circuit diagram, and Figures 8 and 9 are timetables. It is a chart. (69)...Cam body for raising and lowering the tone arm,
(100)...A light shielding plate attached to the cam body (69), (105)...Sensor (photocoupler). Figure 8 Figure 4 Procedures Written amendment (voluntary) 1. Indication of the case 1988 Patent Application No. 119808 2, Name of the invention Record player, Person making the amendment Relationship to the case Name of the patent applicant (188 ) SANYO Electric Co., Ltd. 4, Agent Address: 2-18 Keihan Hondori, Moriguchi City Contact: Telephone (Tokyo) 835-1111 Patent Center Representative Nakagawa 5, Subject of amendment 63 Contents of amendment fi+ Page 6 of detailed description 15th line - 15th line "The switch driving part is in contact with (■...)." [The switch driving part is in an engaged state with (30).]
I am corrected. (2) Lines 7 to 9 of page 13 of the specification, line 8 of page 26, lines 6 to 7 of the same page, and line 8 of page 26 f: "NOR Gate (NOR-1)" Z[
NAND gate (NAND-1) corrected with J. (Page 14, line 6 of the 31 specification, lines 7 to 8 on the same page)
"NAND" described in line 9 and line 10 of the same page
Gate (NANn-1) J2[N. R gate (NOR-1) J and correction down. +41 [Power supply voltage (
+B) J-N is corrected to "earth potential (L level)". (5) Specification page 26, line 78 to page 24, line 1 (
2. Delete "Therefore, it becomes ON." (6) "Sideway means (1] 2)" written in page 25, line '17 of the specification section has been amended to "qI circuit means (111). (7) Figures 7, 8, Figure 9 has been corrected as shown in the attached sheet. Shito 13-

Claims (2)

[Claims] (1) A tone arm, a tone arm elevating mechanism for elevating the tone arm, a detecting means for optically detecting the position of the tone arm elevating mechanism, and a tone arm based on at least a detection output from the detecting means. A muting circuit unit for muting an output signal from a pickup attached to the tip of the arm, and the detecting means detects when the tone arm lifting mechanism has reached a position corresponding to the lowest position of the tone arm. 1. A record player, wherein muting of the pickup output by the muting circuit section is canceled when the muting circuit section detects the muting. (2) The detection means is comprised of a photocoupler consisting of a light emitting element and a light receiving element, and a light shielding plate that is attached to a tone arm lifting mechanism and is movable between the light emitting element and the light receiving element. The record player described in (1).