JPS58121176A - Automatic record player - Google Patents

Abstract

PURPOSE:To set the repetition starting position easily and with high accuracy, by counting the number of pulses delivered in response to the shift extent of an arm to detect the position of the arm. CONSTITUTION:The pulses delivered from a light emitting part 5 and a photodetecting element 6 and in response to the shift extent of an arm 2 are counted by a counter 8. Then the repeating position designating switch 11 is operated, and the output of the counter 8 is latched to a latching circuit 10. When a play is over and the arm 2 turns apart from the record surface, the counter 8 is ciunted down. When the output of the counter 8 is coincident with the output of the circuit 10, the turning action of the arm 2 is stopped with the signal supplied from a lift-down signal generator 12. Then the play is started again at the repeating position designated by the switch 11. In such a way, the repetition starting position can be set easily and with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic record playing device, and in particular, allows the control position of an arm to be set arbitrarily.

In conventional automatic record playing devices, the sound of the record -
It is well known that an auto-repeat mechanism is provided that allows a continuous performance to be performed repeatedly from the beginning to the end. However, with this type of record playing device, it has not been possible to repeatedly play the sound groove of the record from the middle to the end. To solve this problem, an automatic record player has been developed that can mechanically set the play start position of the pickup arm and repeatedly play from the middle of the record's tone groove. However, since this type of device mechanically sets the performance start position of the pickup arm, it has a major drawback in that the set position cannot be easily changed once it has been set.

The present invention solves the above-mentioned drawbacks and provides an automatic record playing device in which the arm can be set at any position on the record, and the setting can be performed accurately and easily.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, I will explain the mechanism part with reference to Figures 1 to 3.
1 is a turntable, 2 is a tone arm that can rotate horizontally and vertically around a bearing 3, 4 is a lift that moves the tone arm 2 up and down, and 6 is located below the tone arm 2 and is provided on the board. 6 is a light receiving element attached to the lower part of the tone arm 2 to receive light from the light emitting member 6, and M is an operating lever. The light emitting member 5 is shown in FIG.

As shown in FIG. 2, the side surface is curved, and the top surface is formed in an arc shape so that it is located on the circumference of a circle centered on the bearing 3, that is, on the rotation locus of the light receiving element 6 attached to the tone arm 2. It is a box with light emitting elements such as lamps housed inside. The upper surface of the light emitting element 5 is made of a transparent material, and the rest of the light emitting element is made of an opaque material so that the light from the light emitting element is emitted only from the upper surface of the light emitting member 5. Furthermore, as shown in FIG. 2, the upper surface portion is colored in black stripes. Therefore tone arm 2
As the light-receiving element 6 rotates, the light-receiving element 6 alternately passes through the transparent part and the black part of the upper surface of the light-emitting member 5, and the pulse-like signal shown in FIG. 6A is outputted to the light-receiving element 6.

Next, the electric circuit configuration will be explained with reference to FIG.

In the figure, 7 is a waveform shaping circuit that shapes the output signal waveform of the light receiving element 6 into the pulse wave shown in FIG. When the tone arm 2 rotates from the outer circumference to the inner circumference of the record, the counter 8 is counted up, and the tone arm 2 counts up or down when the tone arm 2 rotates from the outer circumference of the record to the inner circumference. ,
That is, when the end position is reached or when a cut operation is performed during a performance, the receiver is separated from the record and returns to the stand position, and the counter 8 is switched to count down. , 1o is a latch circuit that latches the output of the counter 8, 11 is a repeat position designation switch that activates the latch circuit 10,
12 compares the output of the counter 8 and the latch circuit 10,
This is a lift-down signal generation circuit that supplies a lift-down signal for lowering the lift to a lift drive circuit 13 that can move the lift 4 up and down only when both outputs match.

Next, the operation of the apparatus of this embodiment will be explained.

First, move the operating lever arm to the start position and lift 4 will start.
is raised, the tone arm 2 is brought to a predetermined record size position, and the pickup is lowered onto the record surface to begin playing.

Since this is a well-known operation in conventional automatic record playing devices, a detailed explanation will be omitted.

As the tone arm rotates clockwise, a pulse-like signal shown in FIG. 6A appears at the output end of the light receiving element 6. The output of this receiving element 6 is shaped via a waveform shaping circuit 7 into a normal pulse wave as shown in FIG. 5A. The number of output pulses from the waveform shaping circuit 7 is counted by a counter 8.

When the record performance turns around again and reaches the desired part, a repeat position designation switch 11 is operated. By operating this switch 11, the launch circuit 10 is activated and the output of the counter 8 is latched.

When the performance is finished and the tone arm 2 reaches the innermost circumference of the record, the lift 4 is raised, the tone arm 2 is separated from the record, and the bridge is rotated in the direction of the position of the stand. In this case, the return detection circuit 9 is activated at the same time as the lift 4 is raised, and the counter 8 is switched to count down. Then, as the tone arm 2 rotates counterclockwise, the counter 8 counts down. When the output of this counter 8 matches the output of the latch circuit 1o, a lift-down signal is applied from the lift-down signal generation circuit 12 to the lift drive circuit 13, the rotation of the tone arm 2 is stopped, and the lift 4 is lowered. The performance is restarted from the repeat position specified by operating the switch 11.

The above description has been given of the case where repeat performance is performed from the middle of the record to the end, but it is also possible to repeatedly perform only an arbitrary part of the record. That is, in the case of the apparatus of the above-mentioned embodiment, the repeat start position can be specified by operating the switch 11, and the repeat end position can be specified by manually operating the operating knob to the cut position.

If it is desired that the repeat end position can be specified in the same way as the repeat start position, a circuit configuration as shown in FIG. 6 may be used. The circuit configuration in Figure 6 is in addition to the circuit configuration in Figure 4.
A latch circuit 10' that launches the output of the counter 8, which is provided separately from the latch circuit 10, a repeat end position specifying switch 11' that starts this latch circuit 10', and the outputs of the counter 8 and the latch circuit 10' are compared. , and a lift-up signal generating circuit 12' for supplying a lift-up signal for raising the lift 4 to the lift drive circuit 13 only when both outputs match. By operating the switches 11 and 11', the repeat start position and repeat end position can be designated.

In the above embodiment, a general automatic record playing device has been described, but the present invention can also be applied to a special playing device such as a linear tracking arm type device shown in FIG. 7, for example. In the case of the device shown in FIG. 7, the upper surface of the light emitting member 5 is linear.

In the above embodiment, the transmitting part paulownia 5° and the light receiving member 6. The waveform shaping circuit 7 constitutes a detection means for outputting a pulse signal corresponding to the amount of movement of the tone am 2, the up/down counter 8 constitutes an addition/subtraction counting means, and the latch circuit 10.10' constitutes a detection means. The storage means includes a lift-down signal generating means 12 and a lift-up signal generating means 1.
2' constitutes a comparison means, and the lift drive circuit 13 constitutes an arm drive means.

As described above, the present invention detects the position of the arm by counting pulses obtained in accordance with the amount of movement of the arm, so that accurate detection of the arm position is possible. Moreover, the arm position is stored in the storage means by external operation, the stored position designation count number is compared with the count number output from the addition/subtraction counting means, and the arm driving means is controlled based on the comparison output obtained. Therefore, program control such as playback and repeat playback of an arbitrary recording section of a record disc can be realized, and an arbitrary recording section can be set with an extremely simple operation even during playback. Also, when controlling the position of the arm, no information is obtained from the record, so the size of the record is used.

It can be used regardless of color etc. and without the need for a special record. In addition, since the arm position can be detected without contact, the sound quality is not affected.
It has high reliability, can be processed entirely using electrical signals, provides a quick response, makes it easy to obtain signals to control other mechanical parts, and has excellent effects such as being able to be configured to be small and lightweight.

[Brief Description of the Drawings] Fig. 1 is a top view showing a first embodiment of the automatic record playing device of the present invention, Fig. 2 is a perspective view of a light emitting member constituting the device, and Fig. 3 is a perspective view of the device. 4 is an electric circuit configuration diagram of the device, FIG. 5 is a waveform diagram of the main part of FIG. 4, FIG. 6 is an electric circuit configuration diagram of the device according to the second embodiment of the present invention, The figure is a top view of a device according to a third embodiment of the present invention. 1... Turntable, 2... Tone arm, 3... Bearing, 4... Lift, 6... Light emitting member, 6... ·····Light receiving element,
7...Waveform shaping circuit, 8...Counter,
9...Return detection circuit, 10.10'...
... Latch circuit, 11 ... Repeat start position designation switch, 11' ... Repeat end position designation switch, 12 ... Lift down signal generation circuit,
12'... Lift-up signal generation circuit, 13.
...Lift drive circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1i21! f Figure 3, Figure 4, Figure 5 (if Figure 6, Figure 7)

Claims (1)

[Claims] position detecting means for outputting a pulse signal corresponding to the amount of movement of the arm; addition/subtraction counting means for adding or subtracting the pulse signal according to the direction of movement of the arm; a storage means for storing information by the operation of the above; a comparison means for comparing the output of the addition/subtraction counting means with the position designation count stored in the storage means; and an arm for driving the arm based on the output of the comparison means. An automatic record playing device comprising a driving means.