JPS6319922B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a record player having an automatic program selection function.

2. Description of the Related Art Conventional record players of this type detect the intervals between songs on a record using a reflective opto-sensor, and drop the needle at the beginning of a predetermined song.

Problems to be Solved by the Invention When the tone arm is dropped between songs in this way, the drop position is different when the tone arm is moving from the forward direction and when it is moving from the opposite direction, and it is not possible to drop the tone arm to the same position correctly. I can't drop the needle on it. The reason for this is (i) When detecting between songs using a reflective opto-sensor, the occurrence of inter-song pulses differs depending on the running direction of the reflective opto-sensor, and naturally the detection position differs.

If the detection positions between songs are different in this way, as a result, even if the tone arm motor is stopped and the tone arm is dropped, it will not fall at the same position.

(ii) Depending on the running direction of the tone arm, the load on the arm drive differs between the forward direction and the reverse direction, and there is also an amount of overrun. That is, even if the song interval is detected at the same position, there will be an overrun, so the item will not fall at the same position whether it is dropped from the forward direction or from the opposite direction.
The present invention was made to solve these problems, and an object of the present invention is to provide a record player that can always drop the needle at a fixed position.

Means for Solving the Problems The present invention provides a track interval detection means for detecting a track interval, a tone arm, an arm drive motor for driving the tone arm, and a drive direction for determining whether the tone arm is driven in a positive direction or a negative direction. arm drive direction detection means for detecting whether the tone arm is in the correct direction, and arm drive motor reverse rotation means for setting the arm drive direction in the forward direction immediately before dropping the tone arm.

Effects Therefore, the effects of the present invention are as follows. That is, the arm drive direction is detected by the arm drive direction detection means, and when the drive direction is in the positive direction, the tone arm is dropped, and when the drive direction is in the negative direction, the arm is not allowed to drop and the motor is rotated in the reverse direction by the motor reverse rotation means. The arm will be dropped after detecting the song interval again from the forward direction.

Embodiments Hereinafter, a record player of the present invention will be described with reference to drawings of embodiments.

1 and 2 show an embodiment of the record player of the present invention, and in the figures, 1 is the record player main body, and 2 is the record player main body 1.
A record player lid is rotatably attached via a hinge 3, 4 is a stop button, 5 is a start button, 6 is a cueing button, 7 is a repeat button, 8 is a power button, 9 is a group of program key buttons, 10 is a Stop operation display element, 11
is a start operation display element, 12 is a cueing operation display element, 13 is a repeat operation display element, 14
is a group of program operation display elements provided corresponding to each program key button. As shown in FIG. 2, the record player main body 1 has a turntable 16 mounted on a turntable shaft 15 rotated by a motor (not shown), and the turntable 16 is mounted around the turntable shaft 15. An EP adapter 17 is provided on the upper surface thereof and is biased by a spring in the direction of always protruding.
On the other hand, the record player lid 2 is provided with a linear tone arm device 18, a record disk holding device 19, and a track interval detection device 20 on its inner surface. The linear tone arm device 18 has guide rails 2 disposed opposite to each other as shown in FIG.
A support base 24 is attached to a moving base 23 that moves on 1 and 22.
A tone arm 26 is supported on this support base 24 by a pivot bearing 25 so as to be movable in angle. A plate 28 having a pointer 27 is protruded from the movable base 23, and the pointer 27 is located on the axis of the tone arm 26 and corresponds to the display window 29 provided on the record player lid 2. There is. The movable base 23 has a plunger 30 for vertically moving the tone arm 26.
The plunger 30 is connected to the tone arm 26 via a link mechanism (not shown).
It is designed to drive a lift shaft 31 placed opposite to the upper surface of the. The moving base 23 is provided with a light receiver 46 and a light emitter 47 facing each other,
A shutter plate 48 provided on the tone arm 26 is positioned between the light receiver 46 and the light emitter 47. These light receivers 46 and emitters 4
When the tone arm 26 swings during the performance of the tone arm 26, the signal from the photocoupler consisting of the shutter plate 7 and the shutter plate 48 is transmitted.
It is used to control the opposing relationship with the moving base 21 to maintain a substantially parallel relationship. A balance weight 49 is attached to one end of the tone arm 26, and a pickup cartridge 50 is attached to the other end. On the other hand, the rotational force of the motor 51 as a driving source for moving the tone arm 26 is applied to a pulley 5 provided on the motor shaft.
2 and a pulley 54 provided on the shaft of the worm gear 53.
and is transmitted to a drum 57 coaxial with a gear 56 meshing with the worm gear 53. The tone arm 26 is moved by connecting a connecting rod 61 provided on the movable base 23 to a rope 60 stretched between the drum 57 and the other pulleys 58, 59. Further, the tone arm 26 corresponds to a rest switch 62, and is configured to move approximately linearly by the guide rails 21, 22, and its rest position is 30 cm, which is the maximum diameter mounted on the turntable 6.
This corresponds to the performance start position on the record disc 42. Although the specific structure of the record disc holding device 19 is not specified, it is attached to the inner surface of the record player lid 2 with a ball bearing at the center, and also holds the record disc 4 mounted on the turntable 16. is biased by a spring so as to press it against the turntable 16 side. Then, it is rotated together with the turntable 16. As shown in FIG. 3, the song interval detection device 20 has the rope 60 installed in the radial direction of the record disc 42 using separate pulleys 32 and 33, and can be adjusted by an adjuster 34 on the rope 60. installed on. The track interval detection device 20 houses a light emitting element 36 and a light receiving element 37 in a holder 35, and is adapted to be moved linearly in the radial direction of the record disc 42 by the rope 60.
Therefore, when the record player lid 2 is closed, the song interval detection device 20 faces the record disc 42 on the turntable 16, moves in conjunction with the tone arm device 18, and detects the light emitting element 36. The light beam emitted from the record disc 42 hits the record disc 42, and the light receiving element 37 receives the reflected light. At this time, the non-recording part of the record disc 42 has a high reflectance of light and a large amount of light enters the light receiving element 37, while in the sound groove part the light is diffusely reflected and the amount of light entering the light receiving element 37 is small. The gap between songs is detected based on the difference in light reflectance between the groove and the groove. The signal from the song interval detection device 20 is processed by a microcomputer serving as a control circuit to control the operation of the tone arm device 18. In addition, the record player lid body 2
A switch 38 is provided between the inner surface of the record player body 1 and the switch 38.
8 is used as a stop signal to the drive circuit of the linear tone arm device 18 when the record player lid 2 is opened while the linear tone arm device 18 is in an operating state. Although not shown, the tone arm 26 includes a tone arm 2.
A switch is provided for detecting that 6 itself is down.

Further, a slit disk 41 is provided on the shaft of the worm gear 53 so as to be rotated between a light receiving element 39 and a light emitting element 40 which are provided facing each other. The signal from the photocoupler made up of the photocoupler 40 and the slit disk 41 is processed by a microcomputer as a control circuit and used to control the position of the tone arm device 18.

FIG. 5 shows an electrical block diagram of the record player of the present invention, in which 71
is a microcomputer as a control circuit, into which operation signals from an operation display section 72 including start, stop, cueing, repeat, program keys and a group of display elements thereof are input;
Outputs lighting and blinking signals to the display element corresponding to the operated button. In addition, the control circuit 7
1 includes an opening/closing detection section 73 (corresponding to the switch 38) that detects the opening/closing state of the record player lid 2.
The opening/closing detection signal is input from the song interval detection device 2.
A song interval detection signal and a record size detection signal are inputted from a song interval detection circuit 74 driven by a reflection signal from an opto-sensor as 0. Further, the control circuit 71 receives a tone arm position detection signal from the tone arm device 18 (corresponding to the signal from the light receiving element 39) and a tone arm down detection signal (corresponds to the built-in switch of the tone arm 26).
is input, a drive signal to the plunger 30 for vertically moving the tone arm device 18 is output, and a drive signal to the drive circuit 75 (corresponding to the motor 51) for moving the tone arm device 18 is output. is output. Note that an offset angle detection signal (corresponding to the signal from the light receiving element 47) from the tone arm device 18 is input to the drive circuit 75. The control circuit 71 is a muting switch circuit 2 provided in the transmission system of the cartridge output from the tone arm device 18.
A drive signal for driving 6 is output. 77 is a motor 7 for rotating the turntable 16.
9 is a drive circuit, and 78 is a rotation speed switching circuit for switching the rotation speed (45 rpm or 33 rpm) of the motor 79, and these drive circuit 77 and rotation speed switching circuit 78 are also controlled by the output from the control circuit 71. It is becoming more and more common.

Microcomputer 7 as the above control circuit
1 exchanges signals with the various circuits 72 to 78 described above, and is pre-equipped with routines for various functions described below.

In other words, the RAM in the microcomputer serving as the control circuit 71 has a counter for detecting between songs,
A counter for waiting time, a counter for detecting the end of a song (SELECT COUNTER), a counter for recognizing the lead-in position, and a counter for pulling the tone arm by a preset distance when moving it in the reverse direction. A counter (A counter) to recognize that the tone arm has been returned, reads the inter-track detection signal at the edge of a specific record disc when detecting the inter-track interval in synchronization with moving the tone arm in the forward direction. counter (B counter), counter to detect the end of the record disc, counter that temporarily works to recognize the distance between songs when detecting between songs (WORKING counter).
COUNTER), a counter (LEDFLASH COUNTER) for flashing the display element corresponding to the operated repeat key or program key, and a memory (KEYSCAN) for reading the operation status of each key such as stop, start, repeat, cueing, program, etc. ) in the microcomputer as the control circuit 71.
The ROM has an initial mode routine, a standby routine, a program mode routine, an auto mode routine, a plain loop routine, a skip mode routine, a deck search routine, a search mode routine, etc. These control circuits 71 control the program of the record player. Various functions such as an automatic song selection function, program repeat function, intermittent cue function, inter-song cue function, and inter-song search function are now available.

Next, regarding the falling position control between songs, as shown in Fig. 6, if a song is detected from the forward direction, the arm drive motor is stopped and then the arm is allowed to fall.
If a song interval is detected from the opposite direction, move the tone arm a certain distance in the opposite direction after detecting the song interval.
Thereafter, the arm drive motor is reversely rotated by the arm drive motor reverse rotation means, the tone arm is moved in the forward direction, and the song interval is detected again from the forward direction, and the arm is dropped.

This fixed distance needs to be larger than the width between songs. The advantages of arm control such that the tone arm always falls from the positive direction are as follows.

(a) Regardless of the difference in the amount of overrun due to directionality, the falling position is the same because it is dropped from the same direction.

(b) It can absorb the amount of play in the arm drive mechanism, preventing position counting errors.

Effects of the Invention As is clear from the above embodiments, the present invention includes a song interval detection means for detecting a song interval, a tone arm,
An arm drive motor capable of driving the tone arm in either a forward or reverse direction, an arm drive direction detection means for detecting whether the tone arm is driven in a positive direction or a negative direction, and an arm drive motor. When the tone arm is driven and the song interval detecting means detects a song interval, when the arm driving direction detecting means determines that the direction is in the forward direction, the arm driving motor is stopped and the tone arm is moved. When the tone arm is lowered and the arm drive direction detecting means determines that it is in the negative direction, the arm drive motor drives the tone arm in the negative direction by a certain distance to pass through the song, and then the arm drive motor is reversed to move the tone arm. Since it is equipped with an inter-music detection operation control means that performs the inter-musical detection operation again while driving in the forward direction, the tone arm can always be dropped after detecting an interval from a fixed direction, and the needle can be detected. It can be dropped between songs with great precision.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the record player of the present invention, FIG. 2 is an external perspective view of the player when the lid is opened, FIG. 3 is an enlarged configuration diagram of the main parts of the player, and FIG. FIG. 5 is a system block diagram of the player, and FIG. 6 is a flowchart for explaining the operation of the player. 19... Tone arm device, 20... Song interval detection device, 26... Tone arm, 39, 40, 41
...Position detection section, 51...Motor.

Claims (1)

[Claims] 1 A song interval detection means for detecting a song interval, a tone arm, an arm drive motor capable of driving the tone arm in either a forward or reverse direction, and an arm drive motor capable of driving the tone arm in either a positive direction or a negative direction. an arm drive direction detection means for detecting whether the tone arm is in the forward direction; When it is determined that the arm drive motor is in the negative direction, the arm drive motor is stopped and the tone arm is lowered, and when the arm drive direction detection means is determined to be in the negative direction, the arm drive motor moves the tone arm a certain distance to pass between songs. A record player characterized in that it is equipped with a song interval detection operation control means that controls the arm drive motor to be driven in the negative direction and then to perform the song interval detection operation again while driving the tone arm in the positive direction. .