JPH0445167Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a drive circuit for a recording medium ejecting device that takes out a desired recording medium from a disk storage section in which a plurality of recording media such as disks are stored.

[Summary of the idea]

This invention is based on a drive circuit of a recording medium ejecting device that takes out a desired recording medium from a disk storage section in which a plurality of recording media such as disks are stored, after reaching the recording medium position one position before the set position. By intermittent operation of the drive signal and turning off the motor drive signal when the set position is reached, the recording medium ejecting section is quickly and accurately stopped at the set position.

[Conventional technology]

2. Description of the Related Art A disk ejecting device has been proposed that takes out a desired disk from a disk storage unit storing a plurality of so-called compact disks on which digital audio signals are recorded, and enables automatic performance and remote control of the disk. If such a disk ejecting device is placed in the trunk of a car, for example, and the disk ejecting device in the trunk is remotely controlled by an operation unit housed in a console box, the disk retrieval device installed in the car can be used to retrieve disks. Replacement can be done easily while driving, improving operability.

By the way, this type of disk ejecting device is
It has a disk storage section in which a plurality of disks are stored, and a disk take-out section that moves along the disk storage section to search for and take out a desired disk from among the disks stored in the disk storage section. There is. This disk ejecting part is
Driven by a motor. Since multiple disks are stored in the disk storage section at a high density, in order to take out the desired disk correctly,
It is necessary to accurately stop the DC motor at a predetermined position.

[Problem that the invention attempts to solve]

If the DC motor that drives the disk ejector rotates too quickly, the DC motor's stop position will pass through the predetermined stop position, making it difficult to place the disk ejector precisely at the position where the desired disk is stored in the disk storage section. Can't stop. By slowing down the rotation of the DC motor, it is easy to accurately stop the DC motor at a predetermined position. However, when the rotation of the DC motor is slowed down, it takes a long time to search for and take out a desired disk from among the disks stored in the disk storage section.

If the DC motor passes a predetermined location, it may be possible to reverse the DC motor and stop it at the predetermined location, but if the inertia is too large, the rotation speed cannot be increased and such control is not possible. However, there is a problem that the software becomes complicated. Furthermore, it may not be desirable for the mechanism to pass through a predetermined stopping position.

Therefore, the purpose of this invention is to quickly move the ejecting section to the desired recording medium ejecting position, and to
It is an object of the present invention to provide a drive circuit for a recording medium ejecting device that can be accurately stopped at the ejecting position.

Another object of this invention is to provide a drive circuit for a recording medium ejecting device that does not require complicated hardware for controlling the speed of a DC motor and does not require complicated software.

Still another object of this invention is to provide a drive circuit for a recording medium ejecting device that can easily compensate for variations in inertia.

[Means for solving problems]

This invention is based on a drive circuit for a recording medium take-out device that takes out a desired recording medium from among a plurality of recording media.
A motor drive signal generation circuit 25 connected to the motor 4, detection means 12 and 22 for detecting the position of the take-out device 4, a comparison means 23 for comparing the detection means 12 and 22 with a set position, and a comparison means 23 for comparing the detection means 12 and 22 with a set position. After reaching the position of the recording medium one position before the set position by the output of 3 is a drive circuit for a recording medium ejecting device including means for turning off a motor drive signal.

[Effect]

The disk take-out section 3 is moved up and down by the rotation of the DC motor 4. The position of the disk ejecting section 3 is determined from the output of the optical sensor 12 to the sensor output counting section 2.
It is found by 2. In the comparing section 23, the output of the sensor output counting section 22 is compared with the set position of the desired storage shelf _BK set by the setting key 27. This allows the disk take-out section 3 to be moved to the desired storage shelf _BK.
When it is detected that the storage shelf B _K-1, which is one position before the storage shelf B K-1, is detected, an intermittent signal is given to the DC motor 4,
The rotation speed of the DC motor 4 is reduced. When it is detected that the take-out part 3 has reached the desired setting position of the storage shelf _BK , the rotation of the DC motor 4 is stopped.

As a result, the take-out section 3 can be moved to the desired storage shelf.
Move at high speed to the storage shelf B _K-1 , which is one place before B _K.
It moves at low speed from the storage shelf B _K-1 that is one space in front of it to the desired storage shelf B _K. By controlling the disk ejecting section 3 in this manner, the disk ejecting section 3 can be moved quickly and stopped accurately at a set position.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, 1 is a disk storage case. The disk storage case 1 includes a plurality of storage shelves B ₁ ,
B ₂ ...B _o , and these storage shelves B ₁ to _{B o}
A plurality of disks are housed in each of the disks parallel to each other at equal intervals. A desired disk is taken out from among the disks stored in the storage shelves B ₁ to _{B o} by a disk take-out section 3 shown by a two-dot chain line.

4 is a DC motor. A gear 5 attached to the motor shaft of the DC motor 4 meshes with a gear 6, and the gear 6 meshes with a gear 7 attached to the lower part of the feed screw 8A. Feed screw 8A, 8B, 8
C and 8D have gears 9A, 9B, 9C, and 9D, respectively.
are attached to each. These gears 9A,
A timing belt 10 is stretched between 9B, 9C, and 9D.

As a result, the rotation of the DC motor 4 is transmitted to the gear 7 via the gear 6, and then to each of the feed screws 8A, 8B, 8C, and 8D via the timing belt 10. When the feed screws 8A, 8B, 8C, and 8D are rotated, the disk ejecting portion 3 is vertically translated in parallel with the rotation.

Gear 6 has two gears with an angular spacing of 180 degrees from each other.
Two holes 11A and 11B are formed. The holes 11A and 11B are provided for detecting the position of the disk take-out section 3. In other words, the distance between each of the storage shelves B ₁ to B _o of the disk storage case 1 corresponds to the distance that the disk take-out section 3 moves when the gear 6 makes a half turn. An optical sensor 12 is arranged facing the gear 6, and the holes 11A, 1
The light passing through 1B is also detected by the optical sensor 12. Since the holes 11A and 11B are arranged with an angular interval of 180 degrees from each other, the optical sensor 12
It can be seen from the output that gear 6 has rotated half a rotation,
As a result, the disk take-out section 3 is placed in the storage shelf B ₁
It can be seen that we have moved one distance between each of ~B _o .

The rotation of the DC motor 4 is controlled by a microcomputer. Under the control of this microcomputer, the disk take-out section 3 is moved to the position of the storage shelf _BK in which the desired disk is stored, based on the detection output of the optical sensor 12. At this time, 1 of the storage shelves _BK containing the desired disks.
The disk retrieval unit 3 moves at high speed until it reaches the storage shelf B _K-1 in the previous position, and then
The disk take-out section 3 is controlled to move at low speed from B _K-1 to the desired storage shelf B _K. Thereby, the disk take-out section 3 can be accurately stopped at the position of the storage shelf _BK in which the desired disk is stored.

For example, a case will be described in which a location where the disk ejecting section 3 has moved to the lowest end is defined as the home position, and a disk stored in the storage shelf _B6 six levels above this home position is taken out. First of all,
A motor drive signal CT1 is supplied to the DC motor 4 as shown in FIG. 3B. As a result, the DC motor 4 rotates, and the disk take-out section 3 moves upward. Storage shelf B ₁ with disk take-out part 3 on the lower level,
Every time B ₂ , B ₃ , B ₄ , B ₅ reach the extraction position, the optical sensor 12 sends pulses P ₁ , as shown in FIG. 3A.
P ₂ , P ₃ , P ₄ , and P ₅ are output. After this pulse is counted 5 times from pulse P ₁ to P ₅ , the delay time t
After that, the DC motor 4 is supplied with the intermittent drive signal CT2 shown in FIG. 4B. Therefore, the take-out section 3 moves at low speed between the storage shelves _B5 and _B6 . When the take-out unit 3 reaches the take-out position of the storage shelf B ₆ and the pulse P ₆ is detected, the drive of the DC motor 4 is stopped. As a result, the take-out section 3 is accurately stopped at the take-out position of the storage shelf _B6 .

In addition, the storage shelf B ₅ one place before the desired storage shelf B ₆
The reason why the intermittent drive signal CT2 is sent to the DC motor 4 after a delay time t after reaching the position is to speed up the operation. In other words,
If the intermittent signal is sent to the DC motor ₄ immediately upon reaching the position of the storage shelf B5, the movement of the take-out unit 3 will be slow between the storage shelves _B5 to _B6 . By setting an appropriate delay time t, the storage shelf
The movement between B ₅ and B ₆ can be sped up.

The control of these DC motors 4 will be explained based on a functional block diagram shown in FIG.

The microcomputer 21 shown surrounded by a broken line in FIG. 1 can be made into a functional block by a sensor output counting section 22, a comparing section 23, a t-delay section 24, and a motor drive signal generating section 25, as shown in FIG. The detection output of the optical sensor 12 (see FIG. 2) is supplied to the sensor output counter 22 from an input terminal 26. As described above, the optical sensor 12 outputs a pulse in response to the disk take-out unit 3 reaching a predetermined take-out position of each of the storage shelves B ₁ to _Bo . This pulse output is counted up or down depending on whether the DC motor 4 rotates forward or backward. Forward and reverse rotation of DC motor 4,
This is informed by the output of the motor drive signal generator 25. As a result, it is detected where the disk ejecting section 3 is located.

On the other hand, the comparison unit 23 is given a setting value by the setting key 27 corresponding to the position of the storage shelf _BK in which the desired disk is stored. The comparison unit 23 compares the count output of the sensor output counting unit 22 with the setting key 27.
Compare the set value set by
Detection of whether the removal position of the storage shelf B _K-1, which is one position before the position of B _K , has been reached, and whether the disk removal unit 3 has reached the removal position of the storage shelf B _K containing the desired disk. Performs detection of whether or not.

The detection output of the comparison section 23 is given to the motor drive signal generation section 25. The output of the motor drive signal generator 25 is converted to DC via the motor driver 28.
It is supplied to the motor 4, and the DC motor 4 is driven.
When the comparison unit 23 detects that the disk take-out unit 3 has reached the take-out position of the storage shelf B _{K -1,} which is one position before the position of the storage shelf B K in which the desired disk is stored, t The flag is supplied to the motor drive signal generation section 25 via the delay section 24, and the motor drive signal generation section 25 supplies a motor drive of an intermittent signal with a duty ratio of 50% to the motor driver 28, for example. This results in
The rotation speed of the DC motor 4 is reduced. When the comparison unit 23 detects that the disk take-out unit 3 has reached the take-out position of the storage shelf _BK containing the desired disk, the motor drive signal of the motor drive signal generation unit 25 is turned off. The rotation of the DC motor 4 is stopped.

In addition, the storage shelf one level before the desired storage shelf B _K
When B _K-1 is reached, it is possible to slow down the rotation of the DC motor 4 by giving a low-level drive signal to the DC motor 4, but in this case,
It becomes impossible to connect the motor drive signal generator 25 and the motor driver 28 with two wires.

The moving speed changes depending on its own weight when moving the disk ejecting section 3 upward and when moving it downward. Therefore, in this embodiment, the intermittent signal for moving the disk ejecting section 3 upward and the intermittent signal for moving the disk ejecting section 3 downward have the same duty ratio but different periods. is used. In other words, the intermittent signal with a short period shown in FIG. 4A is used when the disk ejecting section 3 is lowered, and
An intermittent signal with a long period shown in is used when the disk ejecting section 3 is raised. Thereby, the speed at which the disk ejecting section 3 moves up can be made substantially the same as the speed at which it moves down. Of course, the duty ratio may be changed depending on whether the disk ejecting section 3 is moved upward or downward.

The above control will be explained with reference to the flowchart shown in FIG.

After the DC motor 4 is turned on (step), it is determined whether a detection output is detected by the optical sensor 12 (step). When a detection output is detected, the position of the disk ejecting section 3 is determined from this detection output, and the position of the disk ejecting section 3 is determined from this detection output.
Storage shelf B _K where the desired disk is stored
It is determined whether the set position set as the take-out position has been reached (step). If the set position is reached, the DC motor 4 is turned off (step). If the set position has not been reached, the disk ejector 3 will move to the storage shelf one position before the set position.
B It is determined whether _{the K-1} removal position has been reached (step). If you have reached the removal position of storage shelf B _K-1 , which is one position before the set position, after setting the flag (step), return to step,
The detection output of the optical sensor 12 is detected. If the extraction position has not been reached, the process returns to step and the detection output of the optical sensor 12 is detected.

If no detection output is detected from the optical sensor 12 in step, it is determined whether the flag is set (step). If the retrieval position 3 has passed the retrieval position of the storage shelf B _K-1 which is one position before the set position, a flag indicating this is set in the step. If a flag is detected,
The delay time t is counted (step), and when the delay time t is reached (step), a motor drive signal of an intermittent signal is supplied to the DC motor (step). If the flag is not set in the step, the process returns to the step and detects the detection output of the optical sensor 12.

[Effect of idea]

According to this invention, after the disk take-out unit 3 reaches the storage shelf B K _-1 that is one position before the desired storage shelf B _K , an intermittent drive signal is applied to the DC motor 4,
The rotation of the DC motor 4 is controlled to be slow. Therefore, the disk retrieval unit 3 can be sent at high speed without overrunning the desired storage shelf, and the deceleration control is performed without using complicated hardware or software and without reverse rotation, which reduces the inertia of the motor. By changing the duty ratio or period of the intermittent drive signal, it is possible to absorb the difference in torque caused by the rotation direction of the motor, and since one sensor counts the detection signals, the cost is also low. First, insert the take-out section 3 into the storage shelf B _K containing the desired disk.
can be moved quickly and accurately.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of an embodiment of this invention, Fig. 2 is a perspective view of an example of a disk ejecting device to which this invention can be applied, and Figs. 3 and 4 are an embodiment of this invention. FIG. 5 is a waveform diagram used to explain this, and FIG. 5 is a flowchart used to explain one embodiment of this invention. Explanation of main symbols in the drawings: 1... Disc storage case, 3... Disc take-out part, 4...
... DC motor, 12 ... Optical sensor, 22 ... Sensor output counter, 23 ... Comparison section, 25 ... Motor drive signal generation section, B ₁ - B _o ... Storage shelf.

Claims (1)

[Claims for Utility Model Registration] In a drive circuit for a recording medium ejecting device for ejecting a desired recording medium from among a plurality of recording media, a DC motor that drives the ejecting device, and a motor drive connected to the DC motor. a signal generating circuit, a detection means for detecting the position of the ejecting device, a comparison means for comparing the detection means and the set position, and a recording medium one position before the set position based on the output from the comparison means. After reaching the position, the detection output from the comparison means is delayed for a predetermined time, and based on the delayed detection output, a command to start the intermittent operation of the drive signal of the DC motor is given to the drive signal generation circuit to perform the intermittent operation. and means for turning off a motor drive signal when the set position is reached.