JPH03272050A - Disk player - Google Patents

Abstract

PURPOSE:To accurately detect the existence of a disk and to properly start loading by detecting rotation of a roll by the fact that the roll is rotated with the disk at the time of inserting the disk between a guide and the roll. CONSTITUTION:At the time of loading of a disk 60, a part of the disk 60 is inserted between a guide 84 and a roll 76, and the roll 76 is rotated together with a gear 78 by the friction resistance between the disk 60 and the roll 76. As the result, a pattern 92 added to the end face of the gear 78 is changed, and a pulse signal corresponding to the pattern is outputted from an optical sensor 94. A motor 80 starts rotating by the signal outputted from the optical sensor 94, and the roll 76 is continuously rotated for loading, and the disk 60 is sent to the set position to a turntable 20. Thus, loading is accurately started without an influence of the difference in design on the disk surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an autoloading type disc player in which a recording or recording disc is automatically fed to a set position on a turntable.

[Conventional technology]

Conventionally, in this type of disc player, when a portion of the disc is inserted between a guide and a roller prior to loading, this roller begins to rotate by a drive such as a motor and loading is started. As a result, the disks are fed into the turntable until their centers coincide with each other.

After the loading is completed, the disc is held on the turntable side and enters the play state.

[Problem to be solved by the invention]

At the start of the loading, the presence of the disk inserted between the roller and the guide is detected by an optical sensor or the like, and a roller driving motor is rotated based on a signal output from this sensor.

However, disc designs are not standardized and vary widely. Therefore, even if an optical sensor or the like is used to detect the presence or absence of printing on the disk surface or the presence or absence of a transparent portion of the disk as a discrimination criterion, errors are likely to occur.

A technical problem of the present invention is to provide a disc player that can accurately detect that a disc is inserted between a roller and a guide prior to loading and start loading.

[Means to solve the problem]

In order to solve the above problems, the disc player of the present invention is configured as follows.

That is, prior to loading, a part of the disk is inserted between a guide and a roller, and during loading, the roller is rotated by the rotational force of a predetermined drive source, and this rotation feeds the disk to a set position with respect to the turntable. A type of disc player includes a detection device that detects rotation of the roller due to frictional resistance when the disc is inserted between the guide and the roller and outputs a signal, and a signal output from the detection device. and a control circuit that maintains the power supply circuit of the roller drive source in a driving state for loading based on the driving condition.

[For production]

According to the configuration, when the roller is rotated when the disk is inserted between the guide and the roller, this rotation is detected by the detection device. Based on the signal output from this detection device, the drive source for the roller starts rotating for loading. Therefore, loading can be started accurately without being affected by differences in disk surface design.

Thereafter, the disc is fed to a set position with respect to the turntable by the rotation of the roller, and is held on the turntable side, and the play mode is entered.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the present invention is applied to a player for compact discs or single compact discs.

FIG. 1 shows a side view of the disc player just before loading starts. In this Figure 1, frame l
A traverse plate IO is supported by a plurality of dampers (not shown) for vibration isolation. And this traverse plate lO has a turntable 2.
0 and a motor 22 for driving the same. A spindle 20a concentric with the rotation axis of the turntable 20 protrudes from the upper surface of the turntable 20 so as to be fitable into the center hole 62 of the disk 60. By fitting the spindle 20a into the center hole of the disk 60, the turntable 20
The disk 60 will be positioned relative to the disk 60.

A support portion 12 is formed on the traverse plate 10 at a location on the left side of the drawing, bent upward in the drawing.

A base end portion of a clamper arm 32 is rotatably supported by a hinge pin 34 on this support portion 12 . The clamper 30 constituted by the clamper arm 32 and a clamper disk 44, which will be described later, functions to press and hold the disk 60 against the turntable 20.

The clamper arm 32 is integrally formed with a protrusion 36 extending downward in FIG. 1 from a location near the hinge pin 34. This protrusion 36 and the traverse plate I
A tension spring 38 is hung between the Due to the elastic force of the spring 38, the clamper arm 32 is constantly urged in the clockwise direction in FIG.

A shaft 46 is fixed to the center of the clamper disk 44. The clamper disk 44 is located on the inner surface of the clamper arm 32 (the lower surface in FIG. 1), and
6 is inserted into the clamper arm 32 in the vertical direction, and is prevented from being removed. Note that the shaft 46 is loosely inserted into the clamper arm 32, so that the inclination of the axis and the movement in the axial direction are respectively possible within certain limits.

When the clamper arm 32 performs a holding operation using the hinge pin 34 as a pivot point, the clamper disc 44
The lower surface of the disc 60 contacts the upper surface of the disc 60 and presses the disc 60 against the turntable 20 side. Further, at this time, the turntable 20 and the clamper disk 44 are centered by contact between the tapered cone surfaces (not shown) of the clamper disk 44 and the spindle 20a.

A roller retainer 70 is attached to a hinge pin 72 on the feeding side (right side in the drawing) of the disk 60 in the frame l.
It is assembled so that it can rotate freely using the fulcrum. This roller retainer 70 is provided with rollers 76 for feeding the disk 60 toward the turntable 20 during loading. In addition, the roller retainer 70 includes
Due to the elastic force of a spring (not shown), the hinge pin 72
A biasing force is acting in the clockwise direction in FIG. 1 with .

A large diameter gear 78 is fixed to the roller shaft 74 of the roller 76. On the other hand, a step motor 80, which is a driving source for the rollers 76, is fixed to the roller retainer 70. A drive gear 82 fixed to the main shaft of this step motor 80 and a gear 7 of the roller shaft 74
8 is always engaged.

A guide 84 is disposed above the roller 76 and faces it.
is provided. The guide 84 is formed by processing a plate-shaped portion of the frame 1 so that the portion facing the roller 76 has a smooth curved surface. The roller 76 is urged toward the guide 84 by the spring force acting on the roller retainer 70.

A mode plate 50 is attached to the traverse plate IO so as to be movable to the right from the position shown in FIG. 1 (loading position). The mode plate 50 starts moving in conjunction with the rotation of its drive motor (not shown) when the loading (or unloading) of the disc 60 is completed, and performs various mode switching functions required of the disc player. .

On the side of the mode plate 50, a slope 52 for switching is formed at the upper edge in FIG. This slope 5
2 is in contact with a pin 4o fixed to the clamper arm 32 of the clamper 30. That is, this pin 40 is pressed against the slope 52 by the elastic force of the spring 38 acting on the clamper arm 32. Therefore, when mode plate 50 moves to the right from the loading position shown in FIG.
0 descends along the slope 52, and as a result, the clamper arm 32 rotates in the hold direction using the hinge pin 34 as a fulcrum.

Further, the mode plate 50 is provided with a window 54 for switching. The end of the roller shaft 74 of the roller retainer 70 is inserted into the window 54 . When the mode plate 50 moves rightward from the loading position shown in FIG.
is pushed by the slope 55 of the window 54 and descends along this slope 55. That is, at this time, the roller retainer 70 rotates counterclockwise about the hinge pin 72, and the roller 76 is displaced in a direction away from the guide 84.

Now, FIG. 2 shows a part of FIG. 1 in an enlarged manner. As is clear from FIG. 2, the roller shaft 74
A pattern 92 in which white reflective surfaces and black non-reflective surfaces are alternately arranged along the circumferential direction is attached to the outer end surface of the gear 78 fixed to the gear 78 . The gear 78 is attached to a part of the frame 1 that is in a fixed relationship with the gear 78.
An optical sensor 94 that outputs a pulse signal based on changes in the pattern 92 as the sensor 8 rotates is fixed.

That is, this pattern 92 and the optical sensor 94 constitute a detection device (rotary encoder) 90 that detects rotation of the roller 76.

FIG. 3 shows the relationship between a power supply circuit 100 for a step motor 80, which is a drive source for the roller 76, and a control circuit 110 that controls on/off of this circuit 100. In FIG. 3, the pulse signal output from the optical sensor 94 is transmitted to the flip-flop 11 in the control circuit 11O.
It is input to the set terminal S of No. 2. Then, from the output terminal Q of this flip-flop 112, the transistor 102 incorporated in the power supply circuit 100 of the motor 80 is connected.
In contrast, the switching-on signal will be output.

Further, as will be described later, when a signal is output from the switch 120 which is activated when the disc 60 is fed to a set position with respect to the turntable 20, this signal is input to the reset terminal R of the flip-flop 112. As a result, the output terminal Q of the flip-flop 112
to the transistor 102 of the power supply circuit 100,
The switching off signal is output.

In the disc player having the above configuration, when loading the disc 60, a portion of the disc 60 is inserted between the guide 84 and the roller 76 as shown in FIGS. 1 and 2. Disk 60 at this time
Due to the frictional resistance between the roller 76 and the
rotates together with the gear 78. As a result, gear 7
The pattern 92 attached to the end face of the sensor 8 changes, and a pulse signal corresponding to the change is output from the optical sensor 94. That is, this signal detects that the disk 60 is inserted between the guide 84 and the roller 76.

The signal output from the optical sensor 94 keeps the power supply circuit 100 of the step motor 80 shown in FIG. 3 on. Therefore, the motor 80 begins to rotate,
Roller 76 rotates continuously for loading.

As a result, the disk 60 is fed to the set position relative to the turntable 20. Here, the power supply circuit 100 of the motor 80 is switched off by a signal from the switch 120 shown in FIG. 3, and the driving of the motor 80 is stopped to complete the loading.

As soon as this loading is completed, a motor (not shown) for driving the mode plate 50 starts rotating. This causes mode plate 50 to begin moving rightward from the loading position shown in FIG. Accordingly, as already explained, the clamper arm 32 rotates in the hold direction using the hinge pin 34 as a rotation fulcrum. Further, in parallel with this, the roller retainer 70 also moves to the first position using the hinge pin 72 as a fulcrum.
Rotate counterclockwise as shown in the figure.

FIG. 4 shows the mode plate 50 moved to the play position. In this state, the clamper disk 44 presses the disk 60 onto the turntable 20 and holds it. On the other hand, the roller retainer 70 is held in a position where its rollers 76 are separated from the lower surface of the disk 60. In this state, the disc 60 is held with respect to the turntable 20 in a mutually centered state. Then, the motor 22 of the turntable 20 is started, and the disc player starts playing.

Although one embodiment of the present invention has been described above according to the drawings,
The present invention is not limited to this example, but includes various embodiments.

For example, in the detection device 90, when the disk 60 is inserted and the roller 76 rotates, the rotor of the motor 80 is forcibly rotated in conjunction with this, so that the rotor of the motor 80 is A means for detecting electromotive force may be used instead.

〔Effect of the invention〕

In this way, the present invention utilizes the fact that the roller rotates when the disk is inserted between the guide and the roller, and detects that the roller has rotated. is detected, and loading starts properly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view showing the disc player just before loading starts, FIG. 2 is a side view showing an enlarged part of FIG. 1, and FIG. FIG. 4 is an explanatory diagram showing a control circuit for driving a roller, and FIG. 4 is a side view showing a disc player in a state where a disc is held. 20... Turntable 60... Disc 76... Roller 80... Drive source (step motor) 84... Guide 90... Detection device 100... Power supply circuit 110... Control circuit

Claims (1)

[Claims] Prior to loading, a part of the disc is inserted between a guide and a roller, and during loading, the roller is rotated by the rotational force of a predetermined drive source, and this rotation causes the disc to move relative to the turntable. In a type of disc player that is fed to a set position, a detection device that detects rotation of the roller due to frictional resistance when the disc is inserted between the guide and the roller and outputs a signal, and a detection device that outputs a signal from the detection device. A disc player comprising: a control circuit that maintains a power supply circuit of the roller drive source in a driving state for loading based on an output signal.