JPS6112562Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position display device for displaying the rotational or moving position of a tone arm.

Some record players are equipped with a position display device for displaying the armrest position of a tone arm or the position on a record during performance. Such a position display device is particularly effective when used in, for example, an autoloading type record player in which the tone arm cannot be visually seen from the outside.

A conventional position display device is configured such that a pointer is provided on an operating section or the like, and the pointer is driven in accordance with the rotation of the tone arm by a driving means mechanically connected to the rotation center axis of the tone arm. Things are common. However, since such a position display device is constructed by mechanical coupling, there are structural constraints such as the installation location of the display section, and the above-mentioned driving means is The drawback was that it placed a load on the tone arm and reduced the performance of the pickup.

An object of the present invention is to provide a tone arm position display device that eliminates the above-mentioned drawbacks.

The tone arm position display device according to the present invention is
A signal generating means that is optically coupled to the tone arm and generates an output signal corresponding to the amount of rotation or movement of the tone arm, and a signal generation means that displays the rotation or movement position of the tone arm in accordance with the output signal of the signal generation means. The present invention is characterized by comprising a display means for displaying.

FIG. 1 is a schematic plan view of, for example, a linear tracking player equipped with a position display device according to a first embodiment of the present invention. In the figure, the tone arm 1 moves linearly in the radial direction of the turntable 2. For example, an indicator 3 as a display means for displaying the armrest position of the tone arm 1 or the position on the record is provided in, for example, the operating section of the player body 4. The indicator 3 has, for example, a pointer 5 that is linearly movable in the direction of movement of the tone arm 1.
As shown in the figure, the record size (30cm, 25cm, 17cm)
Two types of scales 6a and 6b corresponding to cm) are displayed. In other words, since dimensions such as the diameter of the first tone groove and the diameter of the final tone groove of a record are specified, for example, the final tone groove position corresponding to the record size is used as a reference, and the distance from this reference position is determined. The scale 6a is for 17cm records, and the scale 6b is for 25 and 30cm records (25cm).
cm and the final sound groove diameter of the 30cm record are the same)
1 shows the movement position of the tone arm 1 during a performance. Also, each scale 6a, 6b has a tone arm 1.
The rest position is also shown. Note that the scale of the indicator meter 3 is not limited to the configuration described above, and various configurations such as a time display are possible. In addition, indicator meter 3
Of course, it may be equipped with a rotary pointer. The pointer 5 of the indicating meter 3 indicates an appropriate value in accordance with the output signal of the signal generating means described below.

FIG. 3 is a side view of one embodiment of the mechanism of the signal generating means that is integrally constructed with the linear tracking arm assembly. In the figure, the tone arm 1 is supported by a moving member 8 via an arm holder 7. The moving member 8 includes rollers 9 and 10.
It is movable by engaging with a pair of guide rails 11a and 11b via. Further, the moving member 8 is driven by a linear motor comprising, for example, a pair of magnets 12a and 12b fixed to the lower end of the moving member 8, a yoke 13 and a coil 14 provided between these magnets.

Further, for example, a rotating disk 15 as a light control means is attached to the roller 9, and the rotating disk 15 is formed with an optically distinguishable pattern. This pattern is, for example, slits 15a arranged at regular intervals in the rotation direction, and on the other hand, this rotating disk 15
Two pairs of photocouplers 19a and 19b each including a light-emitting element 17 and a light-receiving element 18 facing each other across the slit portion are provided at a predetermined interval in the rotational direction of the rotating disk 15. Therefore, as the rotating disk 15 rotates with the movement of the moving member 8, the photo couplers 19a, 19
A pulse-like signal is output from b in accordance with the movement of the tone arm 1.

FIG. 4 is a circuit block diagram of one embodiment of the control section of the signal generating means. In the figure, 20 denotes two pairs of photocouplers 19a and 19b in FIG.
The photo couplers 19a and 19b are arranged in the rotational direction of the rotary disk 15 so that the respective outputs F _A and F _B have a phase difference of 90 degrees as shown in FIG. There is. The output of the photo sensor 20 is shaped into a pulse signal by a waveform shaping circuit 21 and input to an up/down counter (reversible counting circuit) 22 . In addition, two pulse signals F _A ′ and F with a phase difference of 90°
_B ' is applied to an up/down control circuit 23 for instructing the counter 22 to count up and down. The up/down control circuit 23 is configured to generate an up or down command signal by determining which of the pulse signals F _A ' and F _B ' is leading in phase. The up/down counter 22 counts up or down depending on the direction and amount of movement of the tone arm 1, and generates a digital output according to the amount of movement. This digital output is converted into a voltage as an analog quantity by the D/A converter 24 and applied to the above-mentioned indicator meter 3. Therefore, the pointer 5 of the indicator meter 3 indicates a value corresponding to the movement position of the tone arm 1. The value indicated by the pointer 5 indicates the movement position of the tone arm 1, and also indicates the remaining amount of the record (the amount of non-playback portion) at the time of performance. Also,
The display means is not limited to an indicator meter, and a digital display may also be used. That is, by providing a driver circuit after the up/down counter 22 and driving the digital display to display an appropriate value corresponding to the position of the tone arm 1, the same effect as described above can be achieved. can get.

FIG. 6 is a schematic plan view of another embodiment of the mechanism section of the signal generating means, in which a longitudinal member 25 extending over the movement range of the tone arm 1 is provided as a light control means. This longitudinal member 25 has, for example, a slit 26 as an optically distinguishable pattern.
are arranged in a straight line at regular intervals. Further, two photocouplers 19a and 19b are attached to the movable member 8 (shown in the third figure) at a predetermined interval, sandwiching the slit portion of the longitudinal member 25. The photo couplers 19a and 19b are spaced apart in the arrangement direction of the slits 26 so that their respective outputs have a phase difference of 90 degrees as shown in FIG. 5, and each generates a pulse-like signal in response to the movement of the moving member 8. do. Each output of the photo couplers 19a and 19b is input to the up/down counter 2 as in the above embodiment.
2 and output as a signal corresponding to the amount of movement of the tone arm 1 to drive the above-mentioned indicator meter or digital display.

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

FIG. 7 is a schematic plan view of a linear tracking player equipped with a position display device according to a second embodiment of the present invention, in which parts equivalent to those in FIG. 1 are designated by the same reference numerals. In the figure, a linear guide frame 27 is formed on the player body 4 over the range of movement of the tone arm 1 in the direction of movement thereof, and a movable member 28 is fitted into the guide frame 3 so as to be movable. . An indicator 29 indicating the movement position of the tone arm 1 is provided on the upper surface of the movable member 28.
is driven by the driving means described below.

FIG. 8 shows a schematic plan view of an embodiment of the mechanical part of the driving means. That is, at the lower end of the movable member 28, a wire 32 is installed on rotatable pulleys 30 and 31 near both ends of the guide frame 27.
is fixed, and the pulley 31 is rotationally driven by a motor 34 via a wire 33. motor 3
A rotating disk 35 is fixed to the rotating shaft of 4,
This rotating disk 35 has an optically distinguishable pattern formed thereon. This pattern includes, for example, slits 36 arranged at regular intervals in the circumferential direction.
On the other hand, two photocouplers 37a and 37b sandwich the slit portion of the rotating disk 35, and the phase difference of each output in the rotating direction of the rotating disk 35 is 5th.
As shown in the figure, they are spaced at 90 degrees. The photocouplers 37a and 37b each output a pulse-like signal in response to the rotation of the rotating disk 35.

FIG. 9 is a circuit block diagram of one embodiment of the control section of the driving means. In the figure, 38 is a photo sensor including the two pairs of photo couplers 37a and 37b in FIG.
Input to 0. Further, two pulse signals having a phase difference of 90 degrees are applied to an up/down control circuit 41 for instructing the counter 40 to count up and down. This up/down control circuit 41 is configured to generate an up or down command signal by determining which of the two pulse signals is leading in phase. The up/down counter 40 counts up or down depending on the direction and amount of movement of the movable member 28, and supplies a parallel digital output corresponding to the amount of movement to one input terminal of a subtraction circuit 42 in the next stage. . The other input terminal of the subtraction circuit 42 is supplied with the digital output from the signal generating means 43. This signal generating means 43 outputs a digital signal corresponding to the distance traveled by the tone arm 1 from the reference position, and may use the circuit configuration shown in FIG. 4 except for the D/A converter 24. The difference output that is the output of the subtraction circuit 42 is converted into a voltage as an analog quantity according to the difference signal by the D/A converter 44, and is applied to a drive circuit 45 that drives the motor 34. Therefore, motor 3
4 drives the movable member 28 in accordance with the movement of the tone arm 1 so that the index 29 is always located on an extension of the central axis of the tone arm 1. Therefore, indicator 2
9 directly indicates the position of the tone arm 1, so the position of the tone arm 1 can be easily confirmed.

Note that the driving means for driving the movable member 28 is not limited to the configuration described above, and various modifications can be made.

As detailed above, according to the tone arm position display device according to the present invention, since it is optically coupled to the tone arm, the performance of the pickup can be maintained and the display section can be placed at any desired position.
Therefore, such a position display device is most suitable for an autoloading or slot-in type record player in which the tone arm cannot be easily pointed from the outside.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a linear tracking player equipped with a position display device according to a first embodiment of the present invention, FIG. 2 is a plan view of an example of an indicating meter, and FIG. 3 is a plan view of a linear tracking arm assembly. FIG. 4 is a circuit block diagram of an embodiment of the control section of the signal generating means, and FIG. 5 is an output waveform of the photo sensor in FIG. 3. 6 is a schematic plan view of another embodiment of the mechanism section of the signal generating means, and FIG. 7 is a schematic plan view of a linear tracking player equipped with a position display device according to the second embodiment of the present invention. FIG. 8 is a schematic plan view of an embodiment of the mechanism section of the drive means, and FIG. 9 is a circuit block diagram of an embodiment of the control section of the drive means. Explanation of symbols of main parts, 1...Tone arm,
3... Indication meter, 5... Pointer, 15, 35...
Rotating disk, 15a, 26, 36...slit, 1
9a, 19b, 37a, 37b...photo coupler, 22, 40...up/down counter, 2
8...Movable member, 29...Indicator.

Claims (1)

[Claims for Utility Model Registration] (1) A signal generating means that is optically coupled to a tone arm and generates an output signal according to the amount of rotation or movement of the tone arm, and an output signal of the signal generating means. display means for displaying the rotation or movement position of the tone arm according to the tone arm;
The signal generating means includes a light control means having optically distinguishable patterns arranged at regular intervals, and a light control means disposed opposite to the pattern and configured to control the light control means according to the rotation or movement of the tone arm. two optical sensors that optically identify the pattern by changing its relative position in the pattern arrangement direction and output a pair of pulse-like signals with a phase difference of 90°;
1. A tone arm position display device comprising an up/down count for counting pulsed signals while being controlled up or down based on the phase of a pair of pulsed signals from two optical sensors. (2) The tone arm position display device according to claim 1, wherein the display means comprises an indicator that indicates an appropriate value according to the output signal of the signal generation means. . (3) The tone arm position display according to claim 1, wherein the display means comprises a digital display that displays an appropriate numerical value based on the output signal of the signal generation means. Device. (4) The display means includes a movable member having an index on an upper surface and movable linearly in the direction of movement of the tone arm, and an index of the movable member located on an extension of the central axis of the tone arm. The tone arm position display device according to claim 1, further comprising a drive means for driving the movable member according to an output signal of the signal generation means.