JPS58222461A - Record player - Google Patents

Abstract

PURPOSE:To produce accurately the audio signals from the beginning of a desired music, by lowering a stylus to the outside of a prescribed position when a music interval is detected and at the same time cutting off temporarily the output signals of a pickup. CONSTITUTION:A reflected light sensor 5 is attached at the inside of a rotary center on the basis of the stylus position of a pickup 6. A logical circuit 11 detects a music interval via a comparator 10 and from a change of the output of the sensor 5. A plunger 12 is actuated by the control output of the circuit 11 to move down an arm. At this time point, the stylus of the pickup 6 falls to a position much more outside the beginning part of a music. Then the audio signal is rectified by a diode 13 and a capacitor 14 and then compared with the reference voltage 15 by a comparator 16. The output of comparison is fed to the circuit 11. That is, the circuit 11 closes a relay 17 after detecting a shift of the stylus to a music interval and then delivers the audio signal to an output terminal 18 from the pickup 6.

Description

[Detailed Description of the Invention] The present invention provides a non-contact and
The present invention relates to a record player having means for detecting.

FIG. 1 shows a conventional example of a record player that can start playing a record from any song specified by the user. The arm motor rotates 10 times using the worm gear 2a.

The speed is reduced by the worm wheel 2b and converted into parallel movement of the arm base 4 by the belt 3. A reflected light sensor 6 attached to the tip of the pickup 6 irradiates light onto the record surface and receives the reflected light. The current due to the reflected light is amplified by an amplifier 7 and compared with a reference voltage 9 by a comparator 1o. The logic circuit 11 moves the arm over the record surface according to the user's command, and picks up the signal by the output pulse of the ratio filter 1o according to the change in the output current of the reflected light sensor 5 due to the difference in reflectance between the sound groove and the track interval. 6 is detected, the motor 1 is stopped by one control output, and the arm is lowered by the plunger 12 by the other control output,
The performance starts from the beginning of the song specified by the user.

However, in the above conventional configuration, the reflected light sensor 6
It is very difficult to lower the pickup accurately between songs due to over-rotation due to the resolution of the arm motor, inertia of the arm motor, diagonal descent of the plunger 12, eccentricity of the record, etc. However, there have been cases where inconveniences have occurred, such as the song being played from the middle of the song.

The present invention eliminates the above-mentioned conventional drawbacks, and is characterized in that the hour hand that detects the song interval drops outside a predetermined position, and the output signal of the pick amplifier is temporarily cut off. . An embodiment of the present invention will be described below with reference to FIG. Note that the parts indicated by 1 to 12 are the same as those in FIG. 1, so detailed explanations will be omitted.

・:1 In FIG. 2, the reflected light sensor 6 is installed inside the multi-rotation center from the needle position of the pickup 6, and based on the change in its output, the logic circuit 11 detects the interval between songs via the comparator 1o. When the granger 12 is operated by the control output and the arm is lowered, the pickup 60 needle falls well outside the beginning of the song. At this time, logic circuit 1
1, the relay 17 is in the "1 open" state, and the audio signal reproduced by the pickup 6 is not output to the output terminal 18. The audio signal is simultaneously rectified by a diode 13 and a capacitor 14, and compared with a reference voltage 15 by a comparator 16.
is input to. Therefore, after the logic circuit 11 detects that the key has moved between songs based on the output of the comparator 16, the relay 17 is set to 1-close, and the audio signal from the pickup 6 is output from the output terminal 18. - According to the configuration of the above embodiment, when the interval between songs is detected by the output of the reflected light sensor 5 and the arm is lowered, the sword will always fall on the song before the song to be played. Note that the 1111 output from pickup 7 is cut off at this time. Therefore, even if the resolution of the reflected light sensor 5 is not higher than before, and even if the arm motor rotates more due to inertia, that is, even if the position where the needle tip falls changes slightly, the needle will not fall in the middle of the desired song. Since there is no noise, and the output is cut off, unnecessary sounds will not be played. Then, when the output of Pink Up 6 is input and it is detected that the song is between songs, the system switches to generate the sound, so there is no need to particularly increase the accuracy of the mechanical parts as mentioned above. , the desired song will always be played back.

Furthermore, in the above embodiment, when the logic circuit 11 manually inputs the track interval detection output of the reflected light sensor 6, the control output of the logic circuit 11 causes the turntable to rotate faster than the normal rotation speed. Since the output of the pickup 6 is cut off by the relay 17, no inconvenient playback sound is generated.) After that, when the Pink Up 60 Deba becomes low level and detects that it is between songs, the logic 1. If the turntable is configured to return to its normal rotational speed using the control output of the first path 11, the time from the detection of a song interval by the reflected light sensor 6 to the actual generation of the desired song signal can be shortened. It is more convenient for the user.

As described above, according to the present invention, when an interval between songs on a record disc is detected by a non-contact means, the stylus tip of the Gartridge is lowered to the outside of the interval, and the output of the cartridge is turned off.・The non-contact detection means is configured to detect the output of the cartridge and switch the output of the cartridge to the continuous state when it detects that the output level is low and enters the inter-track state. It is possible to generate an audio signal correctly from the beginning of a desired song without having to make the operating precision of the drive means sufficiently high, and the operability is very good.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional record player, and FIG. 2 is a block diagram of an embodiment of the present invention. 1...Arm motor, 6...River, reflected light, 6...Pickup, 1o...Group, comparator, 11...Logic circuit, 12... ...Plunger, 13...Diode, 14...
Capacitor, 16... Comparator, 17...
・Relay, 18...Output terminal. Figure 1 Figure 2

Claims (1)

[Claims] A track interval detection means for detecting the difference between songs on a record disc without contact; a driving means for moving the pickup to an arbitrary position on the record surface; The control means includes an elevating means for lowering or raising the pickup, a switching means for intermittent output of the pickup, and a control means for controlling the drive means, the elevating means, and the switching means based on the output of the song interval detection means. The driving means is stopped in response to an output that detects the song interval of the means, and the pickup output is turned off by the switching means to the position outside the recording start position of the song to be played on the record by the lifting means. A record player characterized in that the control means detects that the needle is lowered and the output of the pickup becomes less than a predetermined value, and the control means drives the switching means so that the output of the pickup is in a continuous state. .