JPH0518193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a loading type record player in which records can be taken in and out from the front or top of the device.

Conventional configurations and their problems In recent years, audio equipment has become more space-saving, and as one example, front-loading record players (hereinafter abbreviated as FL players), which allow records to be loaded and unloaded from the front of the equipment, have become more common. ing.

A conventional FL player will be explained below.
Figure 1 is a block diagram of a conventional FL player.
1 is a motor, 2 is a gear 2a, 2 that meshes with each other.
Reduction gear consisting of b and 2c, 3 is record tray, 4 is outer switch, 5 is inner switch,
6 is an instruction switch operated by the user, 7 is a control circuit, and 8 is a motor drive circuit.

Regarding the FL player configured as above,
The operation will be explained below.

The user attempts to move the record tray 3 by operating the switch 6. Control circuit 7 is switch 6
The motor drive circuit 8 receives the signal from the motor 1.
instructs the drive of the The rotation of motor 1 is reduced by gear 2
This is converted into parallel movement of the record tray 3. When the record tray 3 moves outward or inward and detects that the switch 4 or 5 is turned on, the control circuit 7 stops the rotation of the motor 1.

However, in the above-mentioned conventional configuration, the motor current is stopped when the record tray 3 reaches a specified position inside or outside, so if the user forcibly moves the record tray 3 from the outside, the motor current is stopped when the record tray 3 reaches the specified position. Performing without the
Near the boundary where the switch turns on and off, forced force and motor driving force are applied alternately, causing a state of vibration.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a loading player in which a record tray does not become unstable due to external force.

Structure of the Invention The present invention comprises a motor, a reduction gear that decelerates the rotation of the motor and converts it into linear motion of the record tray, a motor drive circuit, a switch that is turned on when the record tray is at a specified position inside, and a record tray. Controls the motor drive circuit to rotate the motor in the forward or reverse direction using a switch that is turned on when the switch is in a prescribed position on the outside, signals from the two switches, and a signal instructed by the user. Equipped with a circuit, even when the record tray is in a specified position inside or outside, by continuing to supply a constant current to the motor, the record tray is always pressed inward or outward with a constant force, and as a result, it is not affected by external force. This prevents the record tray from becoming unstable.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a block diagram of an FL player in an embodiment of the present invention. 1 to 8 are the same as in FIG. 1, and their explanation will be omitted. 9 is a resistor for passing a bias current from point a to point b in motor 1 when point b is at a low potential (ground);
10 is a resistor for passing a bias current from point b to point a in the motor 1 when point a is at a low potential.

The operation of the FL player of this embodiment configured as described above will be explained below. The functions of 1 to 8 are the same as those shown in FIG. 1, and although the explanation will be omitted, the motor drive circuit 8 causes the motor 1 to move in the direction from point a to point b, for example, when the record tray 3 moves from the outside to the inside. When current is applied, switch 5 is turned on, and even after the motor current is stopped, b
The point is kept in a grounded state. Similarly, in the opposite case, point a remains grounded even after switch 4 is turned on. Therefore, even after the record tray 3 moves outward or inward, the switch 4 or the switch 5 is turned on, and the motor drive circuit 8 cuts off the drive current, the resistor 9 or the resistor Motor 1 through 10
A specified current continues to flow, and a constant force continues to be applied to the record tray 3.

As described above, according to this embodiment, even after the record tray 3 reaches a predetermined position inside or outside and the motor current is cut off, one of the terminals of the motor 1 corresponding to the position of the record tray 3 is connected. ground, and pass a specified current through resistor 9 or 10 to the other end,
By continuing to apply a constant force to the record tray 3, unstable phenomena such as vibration of the record tray 3 due to external force can be prevented.

Effects of the Invention The present invention includes a motor and a reduction gear that reduces the rotation of the motor and converts it into linear motion of the record tray.
A motor drive circuit, a switch that is turned on when the record tray is in the specified position on the inside, a switch that is turned on when the record tray is in the specified position on the outside, and signals from the above two switches and the operation switch. , is equipped with a control circuit that controls the motor drive circuit to rotate the motor forward or reverse, and a constant current continues to flow through the motor even when the record tray is in the specified position inside or outside, so that no external force can be applied. It is possible to prevent unstable phenomena such as vibration of the record tray.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional loading player, and FIG. 2 is a block diagram of a loading player according to an embodiment of the present invention. 1...Motor, 2...Reduction gear, 3...Record tray, 4, 5...Switch, 6...Operation switch, 7...Control circuit, 8...Motor drive circuit,
9,10...Resistance.

Claims (1)

[Claims] 1. A motor, a reduction gear that decelerates the rotation of this motor and converts it into linear motion of the record tray, a motor drive circuit that drives the motor, and a switch that is turned on when the record tray is at a specified position inside. , a switch that is turned on when the record tray is at a prescribed position on the outside, and a switch that controls the motor drive circuit based on signals from the two switches and a signal from the operation switch, and rotates the motor in the forward or reverse direction. 1. A loading player comprising: a control circuit for controlling the record tray; and means for continuing to supply a constant current to the motor even when the record tray is at a prescribed position, either inside or outside.