JPH0429122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a record player that can select any song from among a plurality of songs recorded on a single record.

Conventional configurations and their problems In recent years, there has been a strong tendency for audio devices to become multi-functional, and there is a strong desire for low-priced record players to have additional functions such as a music selection function.

A conventional mutating release device for an automatic music selection record player will be described below. Figure 1 shows a mutating release device for a conventional music selection player, in which 1 is a motor, 2a and 2b are deceleration worm gears, 3 is a belt, 4 is an arm base, 5 is a pick-up arm, 6 is a cartridge, and 7 is a preceding cartridge. 8 is a track interval detection circuit, 9 is a control unit such as a microcomputer, and 10 is a circuit for turning muting on and off.

The operation of the conventional muting cancellation device for an automatic music selection player configured as described above will be explained below.

The rotation of the motor 1 is decelerated by gears 2a and 2b, and converted into parallel movement of the arm base 4 by a belt 3. The reflected light sensor 7 is installed in a position preceding the cartridge 6, and when the sensor is moving over the part of the record's sound groove where the feed pitch is small and the reflectance is small, its output is small and the output is small. When the sensor is moving over a place where the feed pitch between songs is large and the reflectance is large, its output becomes large. The song interval detection circuit 8 passes the reflected light signal from the reflected light sensor 7 through a filter circuit or the like according to the arm movement speed, and determines a song interval and a sound groove. The control unit 9 moves the arm base 4, and when the reflected light sensor 7 detects a song interval, the controller 9 moves the reflected light sensor 7 and the needle of the cartridge 6 by an offset amount so that the needle of the cartridge 6 is above the song interval. advance the arm base 4 by a certain amount of time, stop the arm base 4, and drop the pick-up 5 between the songs on the record, and after a certain period of time, the muting circuit 1
0 causes the muting circuit 10 to release the muting and start playing the record.

However, with the above configuration, since the cartridge 6 is dropped between songs, the needle of the cartridge 6 may slip between songs, variations in the descending speed of the pickup 5, eccentricity of the record, etc. may cause the previous song to be dropped. There is a problem that the beginning of the song is left behind or the beginning of the song is cut off, and a considerable degree of precision is required for the drop position of the needle of the cartridge 6 after detecting the song interval.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and aims to provide an automatic song selection player that prevents the previous song from remaining or the beginning of the song being played when starting a song selection performance. purpose.

Structure of the Invention The present invention includes a pick-up arm, an arm drive unit that moves the pick-up arm in the radial direction of the record, a speed detection device that detects the moving speed of the arm, and a reflected light sensor that detects the interval between songs on the record. In preparation, at the beginning of a song selection performance, the needle of the pick-up arm is dropped just before the track interval on the record optically detected by the reflected light sensor, and the record is traced. By knowing that the record has passed, and canceling muting at this point and starting the record playback, you can play the song accurately from the beginning.
This can prevent the previous song from remaining or the beginning of the song being played to be cut off.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a muting release device for an automatic music selection player according to an embodiment of the present invention.

In FIG. 2, numerals 1 to 10 are the same as in FIG. 1, and their explanation will be omitted. 11 is a pulse generator that generates pulses according to the rotation of the motor; 12 is a pulse generator 11;
This is a speed detection device that detects that the arm base 4 has reached a certain speed or higher using a pulse signal from the.

The operation of the muting cancellation device for the automatic music selection player of this embodiment configured as described above will be described below. Until the song interval is detected, the first
It is the same as the figure and the explanation will be omitted. Now, when the reflected light sensor 7 finds the song interval, the pickup 5 is moved to just before the song gap and stopped, and then lowered so that the needle falls in front of the song gap. When playing a record, the motor 1 is controlled so that the arm base 4 moves inward according to the sound groove of the record.
When the needle moves inward due to the rotation of the record, the motor 1 rotates to move the arm base 4 inward to correct the inclination. According to the rotation of the motor 1, the shutter disc 11c and the photo interrupter 11
A pulse generating section 11 consisting of a and 11b generates pulses. When the normal sound groove is traced by the needle, the output pulse of pulse generator 11 has a long period.
For example, one pulse per rotation of a record,
When tracing rough sections between songs, the cycle becomes shorter. Therefore, the speed detection circuit 12 can be set to generate a detection signal only when tracing between songs using the pulses from the pulse generator 11, and the control section 9 uses the detection signal to cause the pickup 5 to It is possible to know that the vehicle is passing through the gap and send a signal to the muting circuit 10 to cancel the muting.

As described above, according to this embodiment, the song selection lead
Pick up 5 in advance before the song between songs.
drop the needle, the pulse generator 11 sends the pulses generated as the arm moves, that is, the rotation of the motor 1, to the speed detection circuit 12, and then only when the pulse period is short when tracing between songs. If the speed detection circuit 12 is set to generate a detection signal, the control section 11 can use the detection signal to know when the pickup 5 has passed between songs, cancel muting, and start playing. This solves problems such as when the previous song remains when selecting a song or when the beginning of the song is cut off.

Effects of the Invention In an automatic music selection player, when a song interval is found and a lead-in is performed there, the pick-up needle is dropped in advance before the song interval, traced along the sound groove from there, and the needle is traced along the sound groove as the arm moves. At the same time, the pulses output from the pulse generator are input into the speed detection circuit, and based on the pulse period, the speed detection circuit detects that the pickup is passing between songs, and at this point, muting can be canceled through the control section. This eliminates problems such as when the previous song remains or the beginning of the song is cut off when selecting a song to play.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional automatic music selection player, and FIG. 2 is a block diagram of an automatic music selection player according to an embodiment of the present invention. 1... Motor, 2... Reduction gear, 3... Belt, 4... Arm base, 5... Arm, 6...
Cartridge, 7... Reflected light sensor, 8... Song interval detection circuit, 9... Control section, 10... Muting circuit, 11... Pulse generation section, 12... Speed detection circuit.

Claims (1)

[Claims] 1 comprises a pick-up arm, an arm drive unit that moves the pick-up arm in the radial direction of the record, a speed detection device that detects the moving speed of the arm, and a reflected light sensor that detects the interval between songs on the record, Drop the needle of the pick-up arm in front of the track gap on the record optically detected by the optical sensor to trace the record, and detect that the pick-up arm is passing between the track tracks on the record based on the detection signal of the speed detection device. An automatic music selection player characterized in that the detection signal is used to cancel muting and start playing the record.