JPH0319042Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tone arm control device for a record player, and in particular, when tuning an automatic tuning type auto player by manual operation, it is possible to accurately tune between songs. The present invention relates to a tone arm control device that allows the needle to be set.

(Prior Art) In recent years, automation of record players has progressed, and many record players have been provided that are capable of so-called random music selection. This type of record player is equipped with an infrared sensor at the tip of the cartridge, etc., and is configured to be able to set the needle at the correct position between songs by measuring the different reflectance between songs and between songs on the record surface. There is.

However, although the above-mentioned conventional tone arm control device operates extremely smoothly when performing automatic tuning, etc., when manually controlling the tone arm between songs, a light emitting diode or the like is used. You have to manually determine the tone arm position while looking at the track interval indicator etc.

However, since the display time of the above-mentioned inter-song indicator is instantaneous, it is difficult to manually determine the correct position, which causes problems such as the needle landing in the middle of a song.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a tone arm control device capable of correcting a needle landing position shift caused by manual operation.

(Structure of the invention) The tone arm control device according to the invention has a sensor at the tip of the tone arm for detecting a song interval on a record, and the tone arm is controlled by a signal from the sensor. This is a tone arm control device that is now being used, and has a movement function that moves the tone arm, which has been manually moved to an arbitrary position above the record, in one direction above the record, and a movement function that moves the tone arm in one direction above the record. It is equipped with a song detection function that detects a song detection signal and moves the tone arm in the other direction.
It is configured to be able to correct needle landing position deviations caused by manual operations.

(Example) An example of a tone arm control device according to the present invention will be described based on the drawings. In the figure, 1 is a record disc, and 2 is a tone arm that is driven by a stepping motor (not shown) and can move above the record disc 1 in a direction parallel to the disc surface (in the direction of arrows A and B). The cartridge 3 has a needle 4 at its tip, a light emitting source L, and a light sensor S.
is installed. The optical sensor S is such that when the light from the light emitting source L is reflected on the record 1, the reflectance becomes high in the plank part 5 between songs on the record 1, and the reflectance increases in the recorded part 6 on the record 1. By utilizing the fact that diffuse reflection occurs and the reflectance decreases, the output waveform shown in the graph portion of FIG. 1 can be obtained. The tone arm 2 is controlled by each function shown in the flowchart of FIG.

In FIG. 2, reference numeral 10 indicates a movement function of the tone arm 2, and the tone arm 2 is moved in one direction on the record 1 by manual operation to an arbitrary position above the record, that is, in the direction of arrow A. Or, the recorded portion 6 passes through the inter-song plank section 5 in either direction B (direction A in the embodiment).
The head is now able to move. Reference numeral 11 denotes a song interval detection function that detects a song interval detection signal from the sensor S and moves the tone arm 2 in a direction opposite to the above-mentioned moving direction (direction B in the embodiment). It consists of a driving step 12, a step 13 for detecting the presence or absence of an inter-musical part, and a step 14 for stopping the driving of the tone arm.The negative branch of the detection step 13 is the driving step 1.
2 as a closed loop 15.

To explain an example of the operation in the above-described configuration, first, the tone arm 2 is moved to an arbitrary position above the record 1 by manual operation, and then the circuit is brought into the starting state 20. Then tone arm 2
moves in the direction of arrow A21, detecting the gaps between songs,
23 moves 22 until it is detected. When the inter-song plank section 5 is found, the tone arm 2 is moved in one direction by the movement function 10, and the inter-song plank section 5 is moved.
However, the inertia caused by the movement of the tone arm 2 is absorbed by providing a standby time 25.

Next, the tone arm 2 is moved in the other direction (direction B), the song interval detection function 11 is activated, and the tone arm 2
14 stops at a predetermined position in the plank part 5 between songs.
Then, the light emitting diode 26 as an indicator turns on, indicating that the player is ready to play. In addition, in order to move the tone arm 2 in the other direction (direction B), when the return command button 11a is pressed, the song detection function 11 is activated, and the tone arm 2 is stopped at a predetermined position 14 in the plank section 5 between songs. Then, the light emitting diode 26 lights up, indicating that the player is ready to play.

In this state, when the tone arm 2 is given a forward fingering or return command 27, the light emitting diode is turned off 28, and the tone arm 2 moves further to the next inter-musical plank section 5 and repeats the above operation. Further, when a return command is given, the light emitting diode is turned off 28, moves to the previous plank part 5 between songs, and repeats the above operation. If the operation buttons for the advance command and return command are pressed continuously, the above operations are continued continuously, and when the buttons are released, the operation is reset to the initial state and the operation is stopped. It goes without saying that the arithmetic processing unit (not shown) always functions to monitor the on/off state of the command button.

In the above operation example, in the normal manual operation, the tone arm is moved by visually observing the inter-song plank section 5 to determine which song to start playing, but it is necessary to press the operation button for the preceding command or return command. It can also be set by

(Effect of the invention) According to the tone arm control device according to the invention,
In an automatic tuning type auto player, when manually adjusting the tone arm to match between songs on a record, the position between the songs can be accurately detected and the tone arm can be automatically moved to the correct position. , it becomes extremely easy to select songs, and there is no risk of inconveniences such as songs being played from the middle,
Ideal for use with record players.

[Brief explanation of the drawing]

The drawings show an embodiment of the tone arm control device according to the present invention, and FIG. 1 is a cross-sectional view showing the positional relationship between the record disc and the tone arm, and a relationship explanatory diagram showing the relationship between the record disc and the sensor output. is a flowchart. 1: Record, 2: Tone arm, S: Sensor, 10: Movement function, 11: Song detection function.

Claims (1)

[Claim for Utility Model Registration] The tip of the tone arm has a sensor for detecting the song interval on the record, and the tone arm is controlled by the signal from the sensor. This is a tone arm control device that has a movement function that allows the tone arm to be moved to any position above the record by manual operation in one direction above the record, and detects the song interval detection signal from the above sensor. A tone arm control device characterized in that the tone arm control device is further provided with a song interval detection function for moving the tone arm in the other direction, and is configured to be able to correct a deviation in the landing position based on manual operation.