Optical disk changer

An optical disc changer includes a main body, a tray installed in the main body to be capable of sliding, a roulette rotatably installed at the tray and where a plurality of optical discs are accommodated, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, a drive gear member installed at the main body, rotated by being connected to a drive unit, and selectively engaged with a rack gear member formed on the bottom surface of the tray, and a tray gear unit installed adjacent to the drive gear member and having a tray gears selectively engaged with the rack gear member and the drive gear member.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No. 2001-52106 filed on Aug. 28, 2001, in the Korean Industrial Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an optical disc changer, and more particularly, to an optical disc changer adopting a tray transfer unit which is simplified by reducing the number of parts.

2. Description of the Related Art

In general, optical disc drives reproduce information recorded on optical discs such as CDs or DVDs, which are optical recording media, by using optical pickup devices. When an optical disc is placed on a tray and loaded in a drive, a drive unit rotates the optical disc. An optical pickup device mounted at the lower end of the tray reproduces data recorded on the optical disc while being transferred in a radial direction of the optical disc.

Since only one optical disc is accommodated on the tray of the optical disc drive, if a user wishes to reproduce a plurality of optical discs, the user must inconveniently repeat actions including ejecting the tray, placing a new optical disc that the user wishes to reproduce on the tray, and loading the tray in the drive.

To solve the above inconveniences, optical disc changers to selectively reproduce one of a plurality of optical discs accommodated on a tray, so as not to repeatedly change the optical discs, have been developed.

FIG. 1 shows a perspective view showing a conventional front loading type optical disc changer to select a desired one of a plurality of optical discs accommodated on a tray and reproduce the selected optical disc by using an optical pickup device. Referring to FIG. 1 , a conventional optical disc changer 100 includes a main body 110 , a tray 150 installed to be capable of being inserted into the main body 110 , a roulette 160 rotatably installed on the tray 150 and where a plurality of optical discs are accommodated, an optical pickup device 120 to read information from a desired one of the optical discs accommodated on the roulette 160 , and a damper support unit 131 installed above the optical pickup device 120 to support a damper 130 which clamps the optical discs against the optical pickup device 120 .

Also, the optical disc changer 100 includes a tray transfer unit 140 to load or unload the tray 150 in or from the main body 110 .

The optical disc changer 100 loads the tray 150 in the main body 110 to perform reproduction by using the optical pickup device 120 , or unloads the tray 150 after reproduction by the optical pickup device 120 is completed. Also, there is a need to load or unload the tray 150 while one of the optical discs is selected and being reproduced by using the optical pickup device 120 .

FIG. 2 is a plan view of a tray transfer unit shown in FIG. 1 . FIG. 2 , illustrates a tray transfer unit 140 of the conventional optical disc changer 100 , a drive gear member 141 , a tray gear member 142 rotating by selectively being engaged with the drive gear member 141 , and a converter gear member 143 . A rack gear member 151 , having a rack gear formed at both sides thereof, is provided at the bottom surface of the tray 150 so that it engages with the tray gear member 142 and the converter gear member 143 and passes between the tray gear member 142 and the converter gear member 143 as both of these members rotate.

When the tray transfer unit 140 loads or unloads the tray 150 , the tray gear member 142 is engaged with the drive gear member 141 . When the optical disc is being reproduced while the tray 150 is simultaneously loaded or unloaded, the converter gear member 143 and the drive gear member 141 are engaged with each other.

In the conventional optical disc changer 100 , since the converter gear member 143 is additionally used, the cost of manufacturing the optical disc changer 100 increases. Also, to assemble the tray gear member 142 , the converter gear member 143 , and the rack gear member 151 , since an accurate assembly point must be kept, the assembly work is difficult and the number of defective parts increases.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an optical disc changer adopting a tray transfer unit which is simplified by reducing the number of parts.

The foregoing and other objects of the present invention are achieved by providing an optical disc changer comprising a main body, a tray installed in the main body to be capable of sliding, a roulette rotatably installed at the tray and where a plurality of optical discs are accommodated, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, a drive gear member installed at the main body, rotated by being connected to a drive unit, and selectively engaged with a rack gear member formed on the bottom surface of the tray, and a tray gear unit installed adjacent to the drive gear member and having tray gears selectively engaged with the rack gear member and the drive gear.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 3 , an optical disc changer 200 adopting a tray transfer unit 240 according to the present invention includes a main body 210 , a tray 250 loaded and unloaded along a guide member 211 provided at the main body 210 , a roulette 260 rotatably installed at the tray 250 and where a plurality of optical discs are accommodated, an optical pickup device 220 installed at the main body 210 to be capable of pivoting up and down to selectively reproduce the optical discs accommodated on the roulette 260 , and a damper support unit 231 installed at the main body 210 to support a damper 230 which clamps the optical pickup device 220 and the optical disc. Also, a tray transfer unit 240 to load and load the tray 250 in and from the main body 210 is provided.

FIG. 4 shows the tray transfer unit of FIG. 3 . Referring to FIG. 4 , the tray transfer unit 240 comprises a drive gear member 241 installed at the main body 210 and rotated by being engaged with a drive unit 232 (see FIG. 3 ) and a connection gear 233 , and a tray gear unit 242 installed adjacent to the drive gear member 241 and selectively engaged with the drive gear member 241 and a rack gear member 251 (see FIG. 3 ) formed at the bottom surface of the tray 250 .

The drive gear member 241 has a through hole 241 a formed at the center thereof. A first gear 241 b and a second gear 241 c protrude from the outer circumference of the drive gear member 241 to have predetermined arc lengths.

A third gear 241 d is formed along the outer circumference of the lower portion of the drive gear member 241 . Also, an optical pickup raising gear 241 e having a predetermined arc length is formed between the first gear 241 b and the third gear 241 d . The optical pickup raising gear 241 e is engaged with an optical pickup raising unit 243 installed adjacent to the drive gear member 241 and makes the optical pickup device 220 access the optical disc.

A shaft formed at the main body 210 is inserted in the through hole 241 a so that the drive gear member 241 is capable of rotating with respect to the main body 210 .

The first gear 241 b is formed to extend a predetermined length in a radial direction from the upper portion of the drive gear member 241 . The second gear 241 c is formed to extend a predetermined length in a radial direction from a position lower than the first gear 241 b . Here, the first gear 241 b extends longer than the second gear 241 c so that the first gear 241 b is selectively engaged with the rack gear member 251 .

The first and second gears 241 b and 241 c are formed on the circumference of the drive gear member 241 . This is to make the tray gear unit 242 and the rack gear member 251 selectively engaged with each other when the tray 250 is loaded and unloaded. A detailed description of the above operation will be described later.

The third gear 241 d is engaged with the connection gear 233 installed adjacent thereto and connected to the drive unit 232 . Then, the power is transferred from the drive unit 232 to the drive gear member 241 and the drive gear member 241 is rotated in a forward direction (clockwise) and a reverse direction (counterclockwise). Thus, the drive gear member 241 is engaged with the rack gear member 251 and loads and unloads the tray 250 .

The tray gear unit 242 is rotatably installed at the main body 210 and an upper gear 242 a and a lower gear 242 b are formed as part of the tray gear unit 242 . The upper gear 242 a is formed to have a diameter greater than the lower gear 242 b . The upper and lower gears 242 a and 242 b are separated a predetermined distance from each other, the upper gear 242 a being positioned above the lower gear 242 b.

The lower gear 242 b is engaged with the second gear 241 c and the upper gear 242 a is engaged with the rack gear member 251 . Since the first gear 241 b passes between the upper and lower gears 242 a and 242 b , the first gear 241 b is not engaged with the tray gear unit 242 .

The operation of loading and unloading of the tray in the optical disc changer adopting the tray transfer unit having the above structure according to the present invention will now be described.

Here, the loading and unloading operations of the tray 250 can be divided into two operations. FIG. 5 shows the state in which the tray 250 shown in FIG. 3 is loaded in the main body 210 . In FIG. 5 , the tray 250 , where a plurality of optical discs are accommodated on the roulette 260 , is loaded within the mail body 210 . FIG. 6 shows the state in which the tray 250 is unloaded from the main body 210 while the optical disc is being reproduced by the optical pickup device shown in FIG. 3 . In FIG. 6 , while one of the plurality of optical discs is being reproduced by the optical pickup device 220 , the remaining optical discs are accommodated on the roulette 260 and the tray 250 is unloaded.

Referring to FIGS. 4 and 5 , when the tray 250 is to be loaded within the main body 210 , the power of the drive unit 232 is transferred to the connection gear 233 , which is engaged with the third gear 241 d . Then, the drive gear member 241 is rotated in a direction indicated by an arrow A. The second gear 241 c engages the lower gear 242 b and causes the upper gear 242 a , which is engaged with the rack gear member 251 , to rotate. Thus, the tray 250 is loaded in the main body 210 .

In contrast with the above operations, when the tray 250 is to be unloaded from the main body 210 , the drive gear member 241 is rotated in a direction indicated by an arrow B. Then, the tray 250 is unloaded from the main body 210 .

Referring to FIGS. 4 and 6 , in the state shown in FIG. 5 , when the drive gear member 241 is rotated in the direction A, the tray 250 is completely loaded in the main body 210 . Here, any one of the optical discs may be positioned above the optical pickup device 220 . When the drive gear member 241 further rotates in the direction A by continuously receiving the power from the drive unit 232 , the optical pickup raising gear 241 e is engaged with the optical pickup raising unit 243 and rotates the optical pickup raising unit 232 in a direction indicated by an arrow C, thus providing for the optical pickup device 220 to access the optical disc.

When the drive gear member 241 continues to rotate in the direction A, the first gear 241 b passes between the upper and lower gears 242 a and 242 b and engages the rack gear member 251 . Thus, as the drive gear member 241 further rotates in the direction A, the tray 250 is unloaded from the main body 210 . During this operation, the optical pickup device 220 continues to reproduce the optical disc.

When the tray 250 is to be loaded in the main body 210 and the drive gear member 241 is rotated in the direction B, the first gear 241 b engages the rack gear member 251 and is rotated so that the tray 250 is loaded in the main body 210 .

As described above, in the optical disc changer according to the present invention, since the tray transfer unit is simplified by reducing the number of parts, space is saved.