KR20050076295A - Tray open/closed controlling apparatus of disc player - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray opening / closing detection device capable of detecting an electrical signal generated by reflecting laser light on a lower surface of a tray during an opening / closing operation of a disk tray.

The tray opening and closing control apparatus for a disc player according to the present invention includes: a tray moving forward and backward from the main base for inserting and ejecting a disc; A plurality of reflectors formed inside the tray; A pickup that scans a laser beam to detect a signal reflected from the reflector; The microcomputer includes a microcomputer that senses whether a tray open / close key is input to transfer the tray and controls the loading motor to control the transfer of the tray by using the signal detected from the pickup.

Description

Tray open / closed controlling apparatus of disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray opening / closing detection device capable of detecting an electrical signal generated by reflecting laser light on a lower surface of a tray during an opening / closing operation of a disk tray.

The disc tray opening and closing apparatus of the conventional optical disc player is as shown in FIG.

As shown in FIG. 1, the first sensing unit 20 and the second sensing unit 30 are mounted inside the disk tray 14 to open and close the disk tray 14 of the disk reproducing apparatus 10. . Here, the first sensing unit 20 is located at any place in the disc tray 14 where a disc (not shown) is placed. Thus, when the disk is placed, it is detected. In addition, the first sensing unit 20 may be configured as a pressure sensor or a photo sensor. That is, it is possible to detect the pressure of the disk or to determine the presence or absence of the disk using infrared light.

In addition, the second sensing unit 30 is located at any place except the position where the disk is placed in the disk tray 14, and may be configured as a pressure sensor or a photo sensor. That is, after the user places the disc in the disc tray, the user places the hand at an arbitrary point on the second sensing unit 30, or if a certain pressure is applied to the second sensing unit 30, the second sensor unit 30 Infrared is used to detect this.

2 is a block diagram of a disc tray opening and closing apparatus of an optical disc reproducing apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the first sensing unit 40 which detects whether the disk is placed on the disk tray 14 and the second sensing unit which senses a close signal of the disk tray 14 by the user ( 30), the disc tray opening / closing switch 12 for generating an open / closed signal of the disc tray 14 by the user, the detection signals of the first sensing unit 20 and the second sensing unit 30, and The microcomputer 40 generates a control signal for closing and opening the disk tray 14 according to the output signal of the disk tray opening / closing switch 12 and the disk tray 14 according to the control signal generated from the microcomputer 40. It includes a driving unit 50 to close.

The disc tray opening / closing switch 12 is used to open the disc tray 14 for the purpose of mounting or removing the disc (not shown). When the disc tray opening / closing switch 12 is pressed in the state in which the disc tray 14 is closed, the input signal is provided to the microcomputer 40, whereby the microcomputer 40 generates a control signal to the driving unit 50. Thereafter, the drive unit 50 is driven and thus the disc tray 14 is opened.

When the disk is placed on the open disk tray 14, the first sensing unit 20 detects this and generates a detection signal to the microcomputer 40. Thereafter, when the second detection unit 30, which is an infrared sensor, detects the disk tray 14 close signal from the user and generates it to the microcomputer 40, the microcomputer 40 closes the disk tray 14 with the driving unit 50. Generate a control signal for.

That is, the microcomputer 40 generates a control signal to the driving unit 50 only when both of the sensing signals of the first sensing unit 20 and the second sensing unit 30 are input. The reason for this is that when the user passes the disc over the first sensing unit 30 before positioning the disk in the process of positioning the disk in the disk tray 14, the second sensing unit 30 receives the microcomputer ( 40), to prevent this because the disc tray 14 may be closed before the disc is located.

As a result, when the microcomputer 40 receives the sensing signal of the first sensing unit 20 and receives the sensing signal of the second sensing unit 30, the microcomputer 40 controls the closing of the disk tray 14 to the driving unit 50. Configured to generate a signal. The drive unit 50 is composed of a motor drive unit and a motor.

Since the conventional train switchgear uses signals sensed from two sensors, there is a problem in that the product price increases without mounting the sensor and installing the two sensors.

On the other hand, as another embodiment, the disc tray opening and closing device is an open detection switch and a close detection switch are installed in the open / close operating range of the tray, as known from Utility Model Application No. 1996-033101, respectively, to open / close the tray. Detects and controls the tray drive motor, so a lot of contact failures occur. In addition, since two open sensing switches and a cloth sensing switch are required, there is a problem in that workability decreases due to a large number of fastening parts. In addition, since the two-stage switch is used, there is a problem that the product cost increases.

The present invention has been made to solve the above problems, the tray opening and closing control apparatus of the disc player to control the opening and closing of the disc tray using the amount of reflection with the reflective member on the tray surface using the laser of the disc pickup and The purpose is to provide a method.

Another object of the present invention is to provide a tray opening and closing control apparatus and method for a disc player to form a semi-cylindrical reflective member at the lower end of the tray, so as to pass through the upper end of the pickup.

Another object of the present invention is to provide an apparatus and method for controlling the opening and closing of a tray of a disc player for detecting the position of the tray and controlling the position by detecting an optical signal reflected from the reflection member of the tray as an electrical signal.

The tray opening and closing control apparatus of the disc player according to the present invention for achieving the above object,

A tray moving back and forth from the main base for insertion and ejection of the disc;

A plurality of reflectors formed inside the tray;

A pickup that scans a laser beam to detect a signal reflected from the reflector;

The microcomputer includes a microcomputer that senses whether a tray open / close key is input to transfer the tray and controls the loading motor to control the transfer of the tray by using the signal detected from the pickup.

Preferably, the reflector is characterized in that it is formed in a semi-cylindrical on the inner bottom of the tray so that the laser beam scanned from the pickup can be reflected when opening and closing the tray.

Preferably, the reflector is characterized in that a plurality of formed on the inner bottom of the tray spaced apart by a predetermined interval.

Preferably, the microcomputer receives a signal reflected from the reflector of the tray through the pickup, and stops the loading motor after a predetermined time when a second pulse signal among the received signals is received.

And, the tray opening and closing control method of the disc player according to the embodiment of the present invention,

If the open / close key of the tray is input, driving the loading motor in a predetermined direction;

Receiving a pulse signal reflected from a reflector of the tray from a pickup while the tray is being driven by driving of the loading motor;

After the step, if the second pulse signal is received, characterized in that it comprises a step of stopping the loading motor to stop the transfer of the tray after a certain time.

Preferably, the laser beam is scanned from the pickup to the reflector of the tray, and the microcomputer detects the position of the tray using the reflected S-CURVE signal.

Hereinafter, with reference to the accompanying drawings as follows.

3 is a view showing the configuration of the tray opening and closing control device of the disc player of the present invention, Figure 4 is a conceptual diagram showing the opening and closing state of the disc tray on the pickup, Figure 5 is a configuration diagram of the tray opening and closing control device.

3 to 5, a tray 120 which is transported into and out of the main base 110 to be opened and closed, and a reflector 122 which is spaced apart at a predetermined distance from an inner lower end of the tray 120 to protrude in a semi-cylindrical shape; 122a, 122b, a pickup 111 for reproducing or recording information of a disk seated on the tray 122, a pickup transport mechanism (not shown) for transporting the pickup 111, and a tray for transporting the tray 111; It consists of a tray transfer mechanism (not shown) including a loading motor 114 and gears.

Referring to the accompanying drawings, a tray opening and closing apparatus of a disc player according to an exemplary embodiment of the present invention configured as described above is as follows.

3 to 5, the main base 110 fixes the tray 120 up and down and moves it back and forth, and the tray 120 is fixed up and down by the main base 110 and the main base. Located on the (110), the front / rear movement from the main base 110, and inserts / ejects the optical disk to be seated on the disk seat 121 to be mounted on the turn table existing on the pickup base (not shown) .

A plurality of semi-cylindrical reflectors 122 (122a, 122b) are formed at predetermined intervals on the inner lower end of the tray 120. The reflector 122 is integrally formed so that a large amount of light can be detected from the scanning of the laser by attaching the reflective material to the bottom of the tray 120 or by using a mechanical material (that is, a bright mold) having a high reflectance. .

In addition, the reflector 122 is preferably formed inside the tray so as to pass all over the pickup when opening and closing the tray, it is formed in a projecting structure for reflection.

In addition, the loading motor 114 located on the upper surface of the main base 110 is a motor generating power for opening / closing the tray 120. The tray transfer mechanism for transmitting the power is composed of a pulley, a belt, a gear, etc. to reciprocate the tray 120 back and forth by contact with the gear.

At this time, when the tray opening and closing key (key) is pressed to discharge the tray 120, the loading motor 114 is driven clockwise, the driving force of the loading motor 114 to the tray 120 through the tray transfer mechanism Conveyed and conveyed to the left direction. At this time, the laser beam is scanned on the bottom surface of the tray through the objective lens 112 in the pickup 111 provided in the pickup base while the tray 120 is completely transported. Here, it is preferable that a laser beam uses a DVD laser diode as a light source.

Then, the semi-cylindrical reflectors 122 (122a, 122b) of the tray 120 transported on the pickup reflect the scanned laser beam, and the reflected beam is detected by the optical system through the objective lens 112 through the optical system. The detected reflected signal is transmitted to the microcomputer 130.

In this case, as shown in FIG. 4A, when the tray 120 is transferred in all directions, the optical pickup 111 detects the first reflection signal S-CURVE from the first reflector 122a. After a predetermined time, the second reflection signal S-CURVE is detected from the second reflection body 122b.

In the pickup 111, the signal reflected from the tray 120 is detected as an optical signal, that is, an S-CURVE signal (FOCUS ERROR signal), as shown in FIG. 6. That is, when the tray 120 is swinged, the microcomputer 130 scans a laser beam to the reflectors 122a and 122b spaced at predetermined intervals using a DVD laser, and the microcomputer 130 outputs a pulse signal corresponding to the reflected S-CURVE. To be recognized. The microcomputer 130 recognizes the signal to stop the transfer of the tray when both pulse signals are detected.

At this time, even if both pulse signals recognized by the microcomputer 130 are detected, after the second pulse is generated based on the time of inserting / ejecting the disk, the interval d of the reflector, the opening / closing time of the tray, and the like. After a certain time, the driving of the loading motor 114 is stopped.

On the contrary, when the tray opening and closing key is pressed to insert the tray 120, the loading motor 114 is driven counterclockwise, and the driving force of the loading motor 114 is transmitted to the tray 120 through the tray transport mechanism. , Tray 120 is transferred in the right direction.

At this time, in the pickup 111 provided in the pickup base while the tray 120 is completely inserted, the laser beam is scanned on the bottom surface of the tray as shown in FIG. 4B through the objective lens 112. The scanned laser beam is reflected by reflectors 122 (122a, 122b) projecting in a semi-cylindrical portion to the inner lower end of the tray 120, the reflected beam is detected by the photo detector through the pickup 111, detection The received signal is transmitted to the microcomputer 130.

In this case, as shown in FIG. 6, the microcomputer 130 recognizes the signal reflected from the second reflector 122b as a primary pulse signal and stops the second pulse signal reflected from the first reflector 122a. It is recognized as a stop pulse. By the stop pulse signal, the microcomputer 130 stops the driving of the loading motor 114. Here, the stop time of the loading motor 114 may stop driving immediately after recognizing the stop pulse, but whether the tray is completely inserted so as to compensate for the difference between the time of recognizing the stop pulse and the transfer time of the tray. It is preferable to determine the above driving stop time after the test.

7 and 8 are flowcharts illustrating a method of controlling opening and closing of a tray according to an exemplary embodiment of the present invention.

Referring to FIG. 7, when the tray open key is recognized, the pickup is down, the sled is moved to the innermost circumference, and the loading motor is driven (M +) to transfer the tray in all directions (S111 ˜ S115). . In an embodiment, moving the sled to the innermost circumference allows the control operating point of the tray to be performed at that point.

As the tray is moved in all directions, the reflector at the bottom of the tray passes over the pickup. At this time, the laser beam is momentarily reflected to generate a focus error signal S-CURVE through the pickup, and the microcomputer detects a signal corresponding to the focus error signal as a pulse (S117). At this time, the microcomputer stops the loading motor after a predetermined time when the second stop pulse is input (S119). Here, the time point at which the loading motor is stopped is a time point at which the tray is completely transferred and opened after receiving the stop pulse.

8, when the tray close key is recognized, the pickup is down and the sled is moved to the innermost circumference, and the loading motor is driven (M-) to transfer the tray in the rearward direction (S121 to S125). .

Then, as the tray is moved backwards, the reflector located at the bottom of the tray passes over the pickup. At this time, the laser beam is momentarily reflected to generate a focus error signal S-CURVE through the pickup, and the microcomputer detects a signal corresponding to the focus error signal as a pulse (S127).

At this time, the microcomputer stops the loading motor after a predetermined time when the second stop pulse is input (S129). Here, the time point at which the loading motor is stopped is the time point at which the tray is completely transferred and inserted after receiving the stop pulse.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

As described above, according to the tray opening and closing control apparatus and method of the disc player according to the present invention, by forming a plurality of reflectors on the inner bottom surface of the tray, by using a laser signal when opening and closing the tray more precisely the stop time of the loading motor Therefore, there is an effect that can be controlled more reliably.

In addition, since the reflector is formed on the bottom of the tray, it is possible to remove the contact type two-stage switch as in the past, and to reduce the size of the pickup connector and the flexible cable additionally connected to the switch.

In addition, since the control of the stop of the tray using a laser, it is semi-permanent than the conventional contact switch, there is an effect that does not cause problems due to poor contact.

1 is a perspective view of a tray opening and closing control device of a conventional disc player.

Figure 2 is a block diagram of a conventional tray opening and closing control device.

Figure 3 is a tray opening and closing control device of the disc player according to an embodiment of the present invention, a plan view showing the opening and closing state of the tray.

4 is a conceptual diagram of a tray opening and closing control device of the present invention.

5 is a block diagram of a tray opening and closing control device of the present invention.

Figure 6 is a waveform diagram of each part according to the present invention.

7 and 8 are a flow chart illustrating a tray opening and closing control method of the disc player according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110 ... main base 120 ... tray

111.Pick-up 112.Objective

113..Pick-up base 114 ... loading motor

121 ... disc seat 122 ... reflector

130 ... Microcomputer

Claims (6)

A tray moving back and forth from the main base for insertion and ejection of the disc; A plurality of reflectors formed inside the tray; A pickup which scans a laser beam to detect a focus error signal reflected from the reflector; And a microcomputer that senses whether a tray open / close key is input for conveying the tray, and controls a loading motor for controlling the conveyance of the tray using the focus error signal detected from the pickup. Tray opening and closing control. The method of claim 1, And the reflector is integrally formed in a semi-cylindrical shape on the inner lower end of the tray so that the laser beam scanned from the pickup can be reflected when the tray is opened and closed. The method of claim 1, And a plurality of reflectors are formed at a predetermined interval apart from each other. The method of claim 1, The microcomputer recognizes the second pulse signal among the signals reflected from the reflector of the tray as a stop signal, and stops the loading motor after a predetermined time when the stop signal is received. Control unit. If the open / close key of the tray is input, driving the loading motor in a predetermined direction; Receiving a pulse signal reflected from a reflector of the tray from a pickup while the tray is being driven by driving of the loading motor; And stopping the loading motor to stop the feeding of the tray after a predetermined time when the second pulse signal is received after the step. The method of claim 5, When the laser beam is focused on the reflector of the tray in the pickup, the tray control method of the disc player, characterized in that the microcomputer can sense the position of the tray using the reflected S-CURVE signal.