JPH0448469A - Disk ejecting device for disk player - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc ejecting device for a disc player, and is particularly suitable for a compact disc (CD) player for use in a vehicle.

[Conventional technology]

FIG. 5 is a diagram showing the configuration of a vehicle-mounted CD player including a conventional disc ejecting device for the disc player. In the same circle, 1 is a disk such as a CD on which acoustic information is recorded with high density, 1a is the front surface of a center having a slit-like opening for loading and unloading the disk 1, 2 is a disk for loading the disk 1, A motor serves as a power source for ejecting, a roller 3 is rotationally driven by the motor 2, and a disc holding member 4 holds the disc l together with the roller 3. These rollers 3 and disc holding member 4 are located near the center front surface 1a.

It is located within the

Reference numeral 5 denotes a photo sensor located at the back of the disk passage in the center and detects the disk 1. Device 8 consisting of a light emitting diode 6 and a phototransistor 7 is a current setting resistor of the light emitting diode 6, and 9 is a photo sensor of the phototransistor 7. A load resistor, 10 is a motor driver for the motor 2, and 11 is a central processing unit (hereinafter referred to as CPU) 12 that controls the motor driver 10, which is a power source for the photosensor 5 and CPU II.

The cathode of the photodiode 6 and the emitter of the phototransistor 7 are grounded, the anode of the photodiode 6 is connected to the voltage B12 through a current setting resistor 8, and the collector of the phototransistor 7 is connected to the voltage B12 through a load resistor 9. As well as being CPL! 11.

13 is a power supply for the motor driver 10, 14 is its ground terminal, 15 is a board or yarn to which the photosensor 5 is attached, 16 is an eject command input port, 17 is an eject completion detection boat, and 18 is a motor driver control output boat. In addition, a well-known reproducing section (not shown) is provided which rotates the loaded disc 1 and reproduces information from the disc 1.

FIG. 6 is a flowchart showing the operation of CPU II.

Next, the operation will be explained with reference to FIGS. 5 and 6. When an eject command is input to the eject command input port 16 of the CPU 11 in step S1 while the disc 1 is loaded in the set, the process moves to step S2, and the CPU II outputs the motor from the motor driver control output port 18. A signal for rotating the motor 2 in the eject direction is output to the driver 10. In conjunction with the rotation of the motor 2, the roller 3 rotates in a direction to move the disk 1 in the eject direction in the figure.

As a result, the disk 1 held between the disk holding member 4 and the rollers 3 is transferred in the eject direction in the figure.

The photo sensor 5 is a sensor that detects the completion of ejecting the disk 1. When the disk 1 is below the photo sensor 5, the light from the light emitting diode 6 is reflected by the disk 1 and enters the phototransistor 7.
is in a saturated state, so the collector of the phototransistor 7 becomes the ground potential.

For example, when the disk 1 is at the eject completion position and there is no disk 1 below the photosensor 5, the phototransistor 7 is in a cutoff state because the reflected light from the light emitting diode 6 does not enter the phototransistor 7. In this state, the collector of the phototransistor 7 is pulled up by the load resistor 9 and the electric current fi12, and becomes the power supply potential.

When the disk 1 is transferred in the eject direction in the figure as described above and is transferred to the ejection completion position, the collector of the phototransistor 7 changes from the ground potential to the voltage potential due to the above operation. This potential change is transmitted from the collector of the phototransistor 7 to the ejection completion detection port 17 of the CPU II.

Based on this potential change, the CPU II determines that ejection is complete in step S3, and proceeds to the next step S4. In step S4, the CPU II instructs the motor driver 10 to stop driving, stops the motor 2, stops further transfer of the disk 1, and ends the series of processing.

When the ejection is completed, the disk 1 will be in the state shown in FIG. 7.

In the seventh recess, 100 is the housing of the device, 101 is the operator's key, and 102 is the display unit that shows the playback time and operating status.
103 is a slit-shaped opening on the front surface 1a. As shown in the figure, approximately two or more portions of the disc 1 are exposed to the outside through the slit opening 103, so that the disc 1
It becomes possible to pull out the disc 1 from the device by holding the outermost edge and center ring of the disc 1 between fingers without touching the recording surface of the disc and leaving fingerprints or the like.

[Problems to be Solved by the Invention] Since the disc ejecting device of the conventional disc player is configured as described above, the disc will not be inserted into the disc insertion slot unless the operator removes the disc from the disc after ejection is completed. It has a larger protrusion than a certain slit-like opening.

If the CD player is installed in the car's center console and the amount of disc ejection is large, it may be difficult to operate the operator key located below the disc, the display may be difficult to see, or the shift lever may be difficult to operate when operating the car's shift lever. −
In some cases, hands or hands may come into contact with the disc, causing problems such as dust or scratches on the disc, or in the worst case, damage to the disc.

This invention was made to solve the above-mentioned problem, and if a disc is left unattended after being ejected,
Protect the disc from dust and scratches,
Another object of the present invention is to provide a disc ejecting device for a disc player that does not make it difficult to see the display or make it difficult for the operator to operate the keys due to the disc.

[Means to solve the problem]

The disk of the disk player of this invention [i device is
The disc player includes an abandonment detection means for detecting that a predetermined period of time has elapsed after the ejection detection means detects the ejection state of the disc, and the disc movement means detects that a predetermined period of time has elapsed after the ejection detection means detects the ejection state of the disc. When a detection signal is received from the disc, the disc is moved so as to reduce the amount of disc ejection.

[For production]

In the disc ejecting device of the disc player according to the present invention, when the disc has been left unattended for a certain period of time, the unattended state is detected by the unattended detection means, the disc moving means is used to reduce the amount of disc ejected, and the disc is ejected from the slit-shaped opening of the disc. Reduce the amount of exposure.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, the same parts as the conventional example in FIG.
9.12 to 17 are attached to avoid duplicate explanations.

11a is a microcomputer-configured CPU with a built-in timer 21, an eject completion detection boat 17 connected to the collector of the phototransistor 7, an eject command input boat 16, a motor driver drive mode switching output port 18a, and a motor driver loading/eject port. It has a control output boat 22.

23 is the motor 2 based on the output signal from the CPUI 1a.
This is a motor driver drive control circuit that applies speed control as necessary to drive the motor, receives power from a power supply 13 and a ground terminal 14, and is composed of the following elements.

24 is a motor driver control circuit for controlling the motor driver 25, and each input section is connected to a motor driver drive mode switching output capo 18a, a motor driver loading/eject control output port 22, and a bridge circuit to be described later.

33 is a resistor with a resistance value R1, 34 is a resistor with a resistance value R5, and 35 is a resistor with a resistance value R8. The series connection body of the two resistors 33 and 34 and the series connection body of the motor 2 and the resistor 35 are parallel. They are connected to form a bridge circuit, and the parallel connection portions of the series connection bodies are respectively connected to the output portion of the motor driver 25.

27 is a reference voltage, 28 is a semi-fixed resistor that divides the reference voltage 27, and the divided voltage is applied between point a, which is the sliding part of the semi-fixed resistor 28, and the connection point of both resistors 33 and 34. 26
is a differential amplifier, one input part is connected to point a through a resistor 30, and the other input part is connected to the motor 2 and the resistor 3 through a resistor 31.
The resistor 32 is connected to point b, which is the connection point of 5.
It is also connected to its output via. An output section of this differential amplifier 26 is connected to a control input terminal of the motor driver control circuit 24.

In addition to this, a well-known reproducing section is provided which rotates the disc 1 and reads and reproduces information from the disc 1 when the disc 1 is loaded in the center, but this is not shown.

FIG. 2 shows an example of the control operation of the CPU 1la, and this control program is stored in the storage section of the CPU 1a.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 and 2. When an eject command is input to the eject command input port 16 of the CPU 11a while the disk l is loaded in the set, the CPU
I1a moves from step Sll, where it was waiting for this input, to step 312, and switches from the motor driver drive mode switching output port 18a to the motor driver control circuit 24.
A command is output to rotate the motor 2 in the eject direction. Then, the motor driver control circuit 24 rotates the motor 2 in the eject direction via the motor driver 25. The roller 3 is connected to the motor 2, rotates in the eject direction, and transfers the disk 1 held between the disk holding member 4 in the illustrated eject direction. When the disk 1 is moved to the eject completion position, the photo sensor 5 detects this, and the collector of the photo transistor 7 changes from the ground potential ``L'' level to the power supply potential 1H'' level.

The CPU 11a moves from step S13, where it was waiting for this potential change, to step S14, outputs a brake command from the motor driver drive mode switching output port 18a to the motor driver control circuit 24, and outputs a brake command to the motor driver control circuit 24.
The motor 2 is stopped via the . At this time, as shown in FIG. 7, the disk is ejected until the center hole is exposed from the slit opening, as in the conventional case.

Next, proceeding to Step 315, CPLJlla presets the timer 21 to T seconds through the precent line 19a. In the next step S16, the CPU 11a
sends a timer count start command from the timer count start command line 19 to the timer 21 to start timer counting. In step S17, timer 2
It waits until the count time of 1 has passed for T1 seconds. If another command is input during this waiting, the waiting is stopped and the process shifts to other processing.

In step S17, when the CPLlla detects on the timer count end signal line 20 that the timer 21 has counted T+ seconds, it moves to the next step, step S18.

In step S18, the CPU 11a applies speed control to the motor 2 and sends a command to rotate the motor 2 in the loading direction opposite to the ejecting direction to the motor driver drive mode switching output port 18a and the motor driver loading/eject control output port 22. Output from.

The speed of the motor 2 is determined by the semi-fixed resistor 28 as described below.
It is determined by the value obtained by dividing the reference voltage 27 by . The motor driver control circuit 24 has the same voltage between points a, that is,
The motor driver 25 is controlled so that the voltage Eah between points 8 and 3b becomes O, and the speed of the motor 2 is controlled.

FIG. 3 is a schematic equivalent circuit diagram showing the configuration of the motor drive control circuit 23. In FIG. It is composed of a differential amplifier 26. E is a motor drive voltage of the motor driver 25, which is made variable by the motor driver control circuit 24. 62 is an equivalent circuit of the motor 2, in which the motor internal resistance R and the back electromotive force E which increases in proportion to the number of rotations N when the motor 2 rotates.

It is expressed as Since the back electromotive force E and l of the motor 2 are proportional to the rotation speed N, the back electromotive force E is also determined when the rotation speed of the motor to which speed control is applied is determined. R1R1R3 is a resistor 34.
Each resistance value is 33.35.

If the resistance of the bridge circuit is set to R,: R, = J: R, and the pressure between points a and b is E - b - 0, then E,
, l=Elf (R, + RZ)/R2, and E due to partial pressure E8. (However, E, -N) In other words, the motor rotation speed N can be set. That is, the voltage E ab between points a and b is amplified by the comparison amplifier 61 and fed back to the motor driver control circuit 24, so that E, b = OC
If the motor drive voltage E of the motor driver 25 is changed so that VE is achieved, the motor 2 will be driven at a speed corresponding to the partial voltage E
Speed control can be applied to.

As described above, the speed is controlled and the motor 2 starts rotating in the loading direction.

In the next step S19, the CPU 11a uses the timer 21
is preset to T1 seconds. In the next step S20,
The CPU 11a outputs a timer count start command from the timer count start command line 19 to the timer 21 to start the timer count.

In step 321, the CPU 11a waits until the timer count time reaches T2 seconds. During this waiting period, motor 2
is rotating at a predetermined speed in the loading direction as described above. Therefore, by rotating the roller 3 in conjunction with the motor 2, the disk 1 is transferred at a predetermined speed in the loading direction shown in the figure.

After waiting T2 seconds, the CPU 11a moves to step S22, and outputs a brake command from the motor driver drive mode switching output boat 18a to the motor driver control circuit 24, cancels the speed control of the motor 2, and stops the rotation of the motor 2. The series of processing ends. By stopping the rotation of the motor 2, the movement of the disk 1 in the loading direction is stopped.

Immediately after this stop, as shown in FIG. 4, the end portion of the disk 1 is exposed through the slit-shaped opening 103. This amount of exposure is such that the display on the display unit 102 is easy to read, the operator's key 101 is easy to operate, and when the shift lever or hand of the car is touched by the shift lever or hand, the disc 1 can be moved easily with one glance. This is enough for the operator to judge that there is a cent.

Therefore, if the disk 1 is left for 71 seconds after the completion of ejection, it will be moved in the loading direction by the motor 2 whose speed is controlled for T2 seconds, and the amount of ejection will be reduced. On the speed side? Since the disk 1 is transferred in the loading direction by the motor 2 with il applied, there is almost no variation in motor torque or variation in the amount of disk movement due to load or temperature.

There are two methods to take out the disc 1 from the cent in this state.

One is to issue the eject command again by operating the operator key 101 to perform a normal eject operation, resulting in the state shown in FIG. 7.

In the other case, the operator manually pulls out the disk 1 directly from the center in the state shown in FIG.

In the above embodiment, the reason why the disc was not completely pulled into the set from the slotted opening is that if the disc is completely pulled in, the operator will not be able to recognize the presence or absence of the disc. This is because even if a message to that effect is displayed on the vehicle, it is difficult to visually recognize the message inside a car, especially while driving.

〔Effect of the invention〕

As described above, according to the present invention, if the disc is left for a certain period of time after being ejected, the disc is moved so as to reduce the amount of disc ejection. This has the effect of reducing the risk of In addition, there is an effect that the disk does not interfere with the input operation to the operator's key or the visual recognition of the display. Furthermore, since the disc is exposed outside the center, it is possible to judge at a glance whether or not the disc is in the set.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a vehicle-mounted CD player including a disc ejecting device for a disc player according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the CPU in FIG. 3 is a diagram showing a schematic equivalent circuit of the motor drive control circuit in FIG. 1, FIG. 4 is a perspective view of the main parts of the disc player when the amount of disc ejection is reduced,
6 is a block diagram of a conventional in-vehicle CD player, FIG. 6 is a flowchart showing the operation of the CPU in FIG. 5, and FIG. 7 is a perspective view of the main parts of the disc player showing the normal ejecting state of the disc. In the figure, 1... Disk, 2... Motor, 3... Roller, 5... Photo sensor, 11 a. CPU, 12
．． 13-@B, 21...Timer 25...Motor driver, 101...Operator key-103...Slit-shaped opening. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 3 Figure 6 Figure 5

Claims (1)

[Claims] A disk moving means for moving a disk on which information is recorded at high density in a surface direction through a slit-shaped opening to place the disk in an ejected state or a loaded state; and detecting that the disk is in the ejected state. The disc player is equipped with an ejection detection means for detecting that a predetermined period of time has elapsed after the ejection detection means detects the ejection state and that a certain period of time has elapsed since the ejection detection means detects the ejection state. The moving means receives a detection signal from the neglect detection means, moves the disk in the loading direction for a certain period of time, and makes the amount of the disk ejected from the slit-shaped opening smaller than the amount ejected in the ejected state. A disc ejecting device for a disc player, characterized by: