JPS6236296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record player in which a label attached to a record disc can always be viewed in the correct position.

When transporting a record, a label is attached to the center of the record, and this label includes the song title, composer, lyricist, etc.
Various information such as the record contents of the performers and the number of rotations are marked. For example, when recording grooves for several songs are formed on one side of a record, when you want to play and listen to a desired song among these songs, you need to know which song it is based on the song number on the label. The cartridge is shifted down to the desired sound groove.

By the way, the marking state of the record label is set in the vertical and horizontal positional relationship, so if the vertical position is correct when facing the operator, a lot of marking information will be correctly displayed. Although it can be read quickly, it is inconvenient that it is difficult to read when the top and bottom are upside down or shifted left and right.

By the way, in conventional record players, the turntable on which the record is placed and rotated does not have a fixed rotation stop position, so that after playing one song, the turntable continues to play the same record. When I select a desired song from among several songs and try to play it, the position of the label becomes upside down and stops, or it stops sideways and the installation status of the label changes every time I stop. However, the disadvantage was that it was difficult to read the contents of the label.

However, if the operator tries to start playing the next song within a short period of time after finishing playing one song, such as when selecting a song and operating the performance in response to a listener's request, the operator may For example, it would be desirable to be able to read the contents of the label immediately after the rotation of the turntable stops when the first song ends, i.e., when the rotation of the record stops, so as to be able to perform the next requested song. .

If it takes too much time to decipher and select the desired song from among several songs recorded on the same side of the same record, the loss time between performances will increase, making it difficult to smoothly play several songs in succession. becomes impossible to realize.

Therefore, the inventor of the present invention has realized that when the rotation of the record is stopped due to finishing the performance or interrupting the performance in the middle of the song, the label of the record is always in the correct vertical position and the contents written on this label are The present invention was proposed in order to provide a record player that can be stopped at a position where it can be read normally.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing one embodiment.

FIG. 1 is an external view of an embodiment of a record player according to the present invention.

In this embodiment, as shown in the external view of FIG. 1, the present invention is applied to a record player having a general configuration. A turntable 3 that is driven to rotate at a high speed, and a tone arm 6 equipped with a pickup cartridge 5 that traces the sound groove of a record 4 placed on the turntable 3 are provided. A dust cover 7 is attached to the player main body 1 via a hinge 8 so as to be openable and closable so as to cover the player main body 1 and the tone arm 6. Normally, in a record player configured as described above, as shown in FIG. 1, the dust cover 7 is opened and the record 4 is placed on the turntable 3 with the label 9 easily readable from the front side. be done.

As shown in FIG. 2, the turntable 3 has a 4-bit code pattern that positions its rotation angle position every 360°/15 using an absolute address.
Rows of slits 10a, 10b, 10c, and 10d are arranged in the peripheral flange portion 3A. With the slits 10a, 10b, 10c, and 10d, the code pattern consists of four pairs of light emitting diodes 11 arranged oppositely across the peripheral flange portion 3A.
a, 11b, 11c, 11d and phototransistors 12a, 12b, 12c, 12d.

Note that the slits 10a, 10b, 10c,
For example, the code pattern according to 10d is:
A code pattern indicating "1" to "15" in binary coded decimal code (BCD code) as shown in FIG. 3 is used.

Each of the above slits 10a, 10b, 10c, 10
Code reader 1 that reads the code pattern according to d
3 is connected to a brake drive control circuit 14 having a configuration as shown in FIG. and data storage block 16.

This brake drive control circuit 14 is connected to a data storage block 1 that temporarily stores a position data signal of a rotation angle position at the time when the turntable 3 starts rotating.
6, and a braking means (not shown) using an output signal from a data comparison block 17 that compares the position data signal stored in the data storage block 16 with the position data signal indicating the current rotation angle position of the turntable 3. a brake drive circuit 18 that operates the brake drive circuit 18, and the data storage block 1.
6 and a control block 15 for controlling each operation of the data comparison block 17.

That is, each phototransistor 12a, 12b, 12 constituting the code reader 13
The 4-bit position data signals obtained by the inverters 20A, 20B and 2
It is loaded in parallel to the data input terminal group of the 4-bit BCD latch circuit 21 that constitutes the data storage block 16 via 0C and 20D, and the four bits that constitute the control block 15 are loaded in parallel.
One input terminal group of each AND gate 22A, 22B, 22C, 22D and 4-input OR gate 2
3 input terminal groups. Each AND gate 22A, 22B, 22 of the control block 15
C, 22D is a first R/S flip-flop whose other input terminal group is set by a start signal instructing the turntable 3 to start rotating, and is set by a stop signal instructing the turntable 3 to stop rotating. 24 negative output signal ₁
is supplied. In addition, the above OR gate 23
supplies its gate output signal to the set input terminal of the second R.S. flip-flop 26 via a NAND gate 25 gated by the positive output signal _Q1 of the first R.S. flip-flop 24. . The second R/S flip-flop 26 receives the negative output signal from the first R/S flip-flop 24 at its reset input terminal.
₁ and a reset pulse from a pulse generator 27 which generates a reset pulse when the power is turned on. Then, the second R/S flip-flop 26 sends the positive output signal _Q2 to the BCD.
A position data signal is supplied to the control input terminal of the latch circuit 21 and causes the BCD latch circuit 21 to latch a position data signal indicating the rotational position of the turntable 3 when the turntable 3 starts rotating.

In addition, the four AND gates 22A, 22
B, 22C, and 22D are connected to the first R/S by a stop signal that instructs the turntable 3 to stop rotating.
When the flip-flop 24 is reset, the first
The negative output signal of the R.S flip-flop 24 of
₁ , each gate is opened, and the position data signal indicating the current rotation angle position of the turntable 3 from the code reader 13 is sent to one of the 4-bit BCD comparators 28 constituting the data comparison block 17. Parallel load to the data input terminal group of.

Further, the BCD comparator 28 has the other data input terminal group loaded with the latch output data signal from the BCD latch circuit 21 in parallel, and the latch output data signal, that is, the position indicating the start position of the turntable 3. A coincidence detection output signal between the data signal and the current position data signal is supplied to the brake drive circuit 18 to activate a brake means (not shown) and stop the turntable 3.

Turntable 3 stopped in this way
is always stopped at the starting position when it started rotating. Therefore, the user can read the label etc. of the record disc 4 at the normal position.

In the above-described embodiment, the rotation angle position of the turntable is positioned every 360 degrees/15, but more detailed positioning may be performed by increasing the number of bits of the code pattern used. Furthermore, instead of the optical code pattern using the slit as described above, a magnetically recorded code pattern may be detected using a magnetic head.

As is clear from the description of the above-mentioned embodiments, according to the present invention, the present invention includes a position detection means for detecting the rotational angular position of the turntable with respect to the record player body, and a brake means for stopping the rotation of the turntable. The record player is characterized in that the brake means is actuated by the detected output of the position detecting means to stop the turntable at a target position. It can always be stopped at a position that matches the angular position,
It is possible to provide a record player that allows a user to read the label of a record placed on the turntable in a normal state.

[Brief explanation of the drawing]

FIG. 1 is an external view of an embodiment of a record player according to the present invention. FIG. 2 is a longitudinal sectional view of the turntable portion in this embodiment. Third
The figure is a schematic diagram showing an example of a code pattern formed on the turntable. FIG. 4 is a circuit diagram showing an example of the configuration of the brake drive control circuit in the above embodiment. 1... Player body, 3... Turntable,
4...Record, 8...Dust cover, 9...
Label, 10a, 10b, 10c, 10d...
Slits, 11a, 11b, 11c, 11d...
Light emitting diode, 12a, 12b, 12c, 12
d...Phototransistor, 13...Code reader, 14...Brake drive control circuit, 15...Control block, 16...Data storage block, 17
...Data comparison block, 18...Brake drive circuit.

Claims (1)

[Scope of Claims] 1. A device comprising: a position detecting means for detecting the rotational angular position of the turntable with respect to the record player body; and a braking means for stopping the rotation of the turntable; A record player characterized in that it is configured to operate and stop the turntable at a target position. 2. A code pattern indicating the rotational angular position of the turntable with respect to the player body using an absolute address is provided on the turntable, a code reader for reading the code pattern is provided on the player body, and when the turntable starts rotating, the code reader is read. The address data read by the code reader is stored in a temporary storage means, and when the turntable is stopped, a data comparator is used to match the address data read by the code reader with the address data stored in the temporary storage means. A record player characterized in that the record player is configured to perform detection and actuate a brake means in response to a coincidence detection signal from the data comparator to stop the turntable.