JP2604062B2 - Recording medium selection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording medium selecting device, and particularly to an audio device.
The present invention relates to a recording medium selection device applicable to a CD changer player or the like.

<Prior Art> Audio CD having a magazine for accommodating a plurality of CDs, a CD ejector for ejecting a desired CD from the magazine, and a moving / positioning means for moving the CD ejector up and down to a desired CD position There is a changer player, the moving and positioning means, an elevator motor,
An elevator mechanism for receiving the drive force from the motor to move the CD pickup means up and down, a pulse generator for generating a position pulse each time the CD pickup means comes to a certain moving position, and monitoring the position pulse And a control unit for controlling the driving of the motor.

In such a CD changer player, the position pulse generated from the pulse generating section by the rotation of the elevator motor is counted by the counting section, and the counted value is instructed by the operation section from the CD.
When the count value coincides with the count value corresponding to the position, the drive of the elevator motor is stopped, and the CD pickup means is positioned at a desired CD position.

Specifically, for example, assuming that a CD ejector is present at the position A as shown in FIG. 4 and an instruction to select two or more CDs is issued from the operation unit at this position, the control unit outputs an “H” level signal. Is output to the motor driver to perform DC driving of the motor (the elevator down signal ED is set to “L”). Then, when the second position pulse is input, the elevator up signal EU is dropped to "L" to stop driving the motor.

<Problem to be Solved by the Invention> However, when the elevator up signal EU is dropped to “L” at the time when the position pulse related to the target position is input, the CD is reduced due to the mechanical inertia of the elevator mechanism and the motor.
The removal means overruns from the target position,
There was a problem that a mistake occurred when removing the CD.

In view of the above, it is an object of the present invention to provide a recording medium selection device capable of accurately positioning a medium take-out means.

<Means for Solving the Problems> According to the present invention, in the present invention, a first control unit that drives a motor in a desired direction by DC and stops driving when a desired number of position pulses are input from a pulse generation unit; Following the driving by the first control unit, this is achieved by the second control unit that performs pulse driving of the motor in the direction opposite to the first control unit and stops driving when the first position pulse is input from the pulse generation unit. .

<Operation> According to the present invention, first, the motor is DC-driven in the forward rotation direction or the reverse rotation direction according to the desired moving direction to move the medium take-out means, and when a desired number of position pulses are generated, Stop driving the motor once. Subsequently, the motor is pulse-driven in the opposite direction, and when the first position pulse is generated, the driving of the motor is stopped. Thereby, even if an overrun occurs at the time of the first DC driving, the medium can be accurately returned to the target position by pulse driving correspondingly, so that accurate positioning of the medium removing means can be performed, and no removal error occurs. The time required for moving the medium take-out means hardly changes.

<Embodiment> FIG. 1 is a diagram showing a main part of a CD changer player according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a mechanism around an elevator motor, and FIG. 3 is a diagram illustrating an operation of the present invention.

In FIG. 1, reference numeral 1 denotes a magazine for accommodating a plurality of CDs in a vertical direction, reference numeral 2 denotes a CD take-out means which moves up and down to take out a desired CD, and reference numeral 3 denotes a CD mechanical means which moves up and down integrally with the CD take-out means. , A turntable (not shown), a spindle motor, an optical pickup, and the like.

Reference numeral 4 denotes an elevator mechanism for moving the CD take-out means 2 and CD mechanism 3 up and down, 5 an elevator motor for supplying a driving force to the elevator mechanism 4, and 6 a pulse generator, which is provided in the elevator mechanism 4. CD removal means 2
A position pulse is generated each time a.

As shown in FIG. 2, the elevator mechanism section 4 has a rotation transmission mechanism 7 coupled to the rotation shaft of the elevator motor 5, 7a is a rack, 7b is a pinion, 7c is a drive gear, 7d is an intermediate gear, Reference numeral 7e denotes a gear for moving up and down members (not shown) supporting the CD take-out means 2 and the CD mechanical means 3.

Returning to FIG. 1, the pulse generator 6 includes a drive gear 7c and a photo interrupter 6a, and the drive gear 7c has a hole at a position 180 ° opposite thereto. Generate a pulse.

8 is a motor driver constituted by a differential amplifier, 9 is a first control unit for controlling the elevator motor 5 while monitoring position pulses, 10 is an operation unit for selecting a disk number,
11 and 12 are OR circuits.

In the internal configuration of the first control unit, 9a is a counting unit that counts position pulses generated by the pulse generation unit 6 in an up-count mode (upward movement) or down-count mode (downward movement), and 9b is an operation unit 10 A conversion unit for converting the desired disk number selected in the target count value, a comparison unit 9c for comparing the count value of the counting unit 9a and the target count value converted by the conversion unit 9b,
Reference numeral 9d denotes a DC drive control unit for performing DC drive of the elevator motor 5 via the OR circuits 11, 12 and the motor driver 8 according to the comparison result of the comparison unit 9c.

The DC drive control section 9d outputs an "H" level elevator up signal EU when the CD pickup means 2 moves upward, and outputs an "H" level elevator down signal ED when moving downward.

Reference numeral 13 denotes a second control unit for controlling the elevator motor 5, which receives the position pulse from the pulse generation unit 6 and the comparison signal from the comparison unit 9c of the first control unit 9, and controls the elevator motor by the first control unit 9. Following the control of 5, the pulse drive of the elevator motor 5 is performed in the direction opposite to the first control unit 9 based on the comparison result of the comparison unit 9c, and the drive is stopped when the first position pulse is input.

When the first control unit 9 controls the upward movement, the second control unit 13 performs an elevator down signal E of "H" level.
D ′ is output as a pulse, and conversely, when the first control unit 9 controls the downward movement, an elevator up signal of “H” level
EU 'pulse output.

Next, the overall operation of this embodiment will be described with reference to FIG.

It is assumed that the CD take-out means 2 is at the position "3" in advance, and the count value of the counting unit 9a of the first control unit 9 is "7".

When, for example, the No. 5 disk is selected by the operation unit 10, the selection command is sent to the conversion unit 9b of the first control unit 9, converted to the target count value "9", and sent to the comparison unit 9c. The comparison unit 9c compares the count value of the counting unit 9a with the target count value sent from the conversion unit 9b, and gives an ascending command to the DC drive control unit 9d because the target count value is larger, and raises the counting unit 9a. Enter the count mode. The DC drive control unit 9d having received the ascending command outputs an “H” level elevator up signal EU to the motor driver 8 via the OR circuit 11, and drives the elevator motor 5 in the normal rotation direction (the elevator down signal EU "L"
Level).

The forward rotation of the elevator motor 5 causes the rack 7 in FIG.
a, the drive gear 7c rotates via the pinion 7b, and further, the gear 7e rotates via the intermediate gear 7d, and the CD pickup means 2 rises. When the hole provided in the drive gear 7c rotates through the photointerrupter 6a due to the rotation of the drive gear 7c, a position pulse is generated. The counting section 9a counts the position pulse in the up-count mode, and when the count value becomes “9”, the comparing section 9c gives a stop command to the DC drive control section 9d, and the DC drive control section 9d sends the elevator up signal EU. The level is lowered to “L” level, and the drive of the elevator motor 5 is stopped.

At this time, the elevator mechanism 4 and the elevator motor 5
In fact, due to the mechanical inertia of the CD, the CD take-out means 2 is slightly overrun from the position of the No. 5 CD of the magazine 1.

When the comparing unit 9c outputs the stop command, the second control unit 13
The counting operation is output to the counting unit 9a of the first control unit 9 to prohibit the counting operation. Since the comparison unit 9c has output the rising command up to that time, the "H" level is opposite to the first control unit 9. Is pulsed and input to the motor driver 8 via the OR circuit 12 to pulse drive the elevator motor 5 in the reverse direction (elevator up signal EU ').
Takes "L" level).

The drive gear 7c rotates intermittently in the direction opposite to that described above via the rack 7a and the pinion 7b in FIG. 2 due to the inversion of the elevator motor 5, and further, the gear 7e via the intermediate gear 7d. Rotates, and the CD removing means 2 descends intermittently. A position pulse is generated when the hole provided therein passes through the photointerrupter 6a due to the reverse rotation of the drive gear 7c. When the first position pulse is inputted after the descent starts, the second control unit 13 issues an elevator down signal ED '.
Is lowered to the “L” level, the drive of the elevator motor 5 is stopped, and the output of the count prohibition signal to the counter 9a is stopped.

Since the amount of movement of the elevator mechanism 4 and the elevator motor 5 in the descending direction at the time of descending is small, and because the motor stops after intermittent operation, no mechanical inertia is generated, and the elevator returns to the target position quickly and accurately. become. Further, the count value of the counting section 9a matches the current position of the CD extracting means 2, and the target position does not change during the next moving operation.

When a CD position lower than the current position of the CD ejecting means 2 is selected by the operation unit 10, the first control unit 9 first issues the "H" level elevator down signal ED in the same manner as described above.
Is output, and the elevator motor 5 is DC-driven in the reverse direction to lower the CD take-out means 2. When a desired number of position pulses are generated, the drive is stopped.
13 outputs an "H" level elevator up signal EU 'to pulse drive the elevator motor 5 in the forward direction, and stops driving when the first position pulse is input.

<Effects of the Invention> According to the present invention, first, the motor is DC-driven in a desired direction to move the medium take-out means, and when a desired number of position pulses are generated, the driving of the motor is temporarily stopped. Subsequently, the motor is pulse-driven in the opposite direction, and the motor is stopped when the first position pulse is generated.Therefore, when the motor is moved in the desired direction by the first DC drive, it overruns from the target position. However, since the medium is returned to the target position by pulse driving in a dimensional manner, the medium take-out means can be accurately positioned, and occurrence of a take-out mistake can be prevented. In addition, the time required for moving the medium take-out means hardly changes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a CD changer player according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a rotation transmitting mechanism of an elevator mechanism in FIG. 1, and FIG. 3 is an operation according to the present invention. FIG. 4 is an explanatory view of the conventional operation. DESCRIPTION OF SYMBOLS 1 ... Magazine 2 ... CD removal means 4 ... Elevator mechanism part 5 ... Elevator motor 6 ... Pulse generation part 9 ... First control part 13 ... Second control part

Claims (1)

(57) [Claims] A magazine for accommodating a plurality of recording media;
A medium take-out means for taking out a desired recording medium from the magazine; and a movement / positioning means for moving the medium take-out means to a desired position, wherein the movement / positioning means moves the medium take-out means. A mechanism section, a motor for supplying a driving force to the moving mechanism section, a pulse generating section for generating a position pulse each time the medium take-out means reaches a predetermined moving position, and controlling the driving of the motor while monitoring the position pulse In a recording medium selection device constituted by a control unit, a first control unit which direct-drives a motor in a desired direction and stops driving when a desired number of position pulses are input from a pulse generation unit, Following the drive by the first control unit, the motor is pulse-driven in the opposite direction to the first control unit, and the drive is performed when the first position pulse is input from the pulse generation unit. Recording medium selection apparatus characterized by comprising a second control unit for stopping the.