KR100240124B1 - Top loading type cdp - Google Patents

Abstract

In order to make the cover simple and easy to assemble and to open and close the cover automatically, the tray frame is formed on the case frame, the tray frame is formed on the top of the device frame and the tray is inserted into the CD frame. A cover having one side rotatably installed, a pickup frame equipped with a pick-up device and a CD rotating device and rotatably installed on one side of the device frame, and a frame mounted on the device frame and rotating the pickup frame about one corner. It provides a top-loading CD including a loading device which opens and closes a cover.

The loading device includes a moving member movably coupled to the apparatus frame, a drive motor installed on the moving member and capable of forward and reverse rotation, a power transmission means installed on the moving member and transmitting rotational force of the drive motor, and a power transmission means. And moving means for moving the moving member, and opening and closing means for opening and closing the cover in association with the moving means.

Description

Top-loading CD

The present invention relates to a top loading type CD, and more particularly, to a top loading type CD having a simple structure, automatic opening and closing of a cover, and a cover and a loading device assembled together.

In general, a compact disc player (CDP) (hereinafter referred to as a CD) may store information stored on a compact disc (hereinafter referred to as a CD), for example, voice information (sound, beat, pitch, etc.). As a device for reproducing, there are a front loading method of loading a CD forward and a top loading method of loading a CD upward.

In the above, the top-loading CD is inserted and withdrawn from the top, so the CD can be quickly mounted and the jog dial can be used to quickly or slowly adjust the playback speed. It is widely used by professionals related to music.

Conventional top loading method CD is used as described above is a box-shaped lower case with an open upper side, an upper case is opened and assembled while wrapping the lower case, the lower case is installed on the bottom surface of the lower case A power supply device for stably supplying power input from the outside, a substrate mounted on the lower case and equipped with a plurality of electronic components for processing and controlling various signals, and formed on an upper surface of the upper case A device frame having a tray into which the CD is inserted and seated, a loading device installed in the lower case and operable to insert and withdraw the CD into the tray by power supplied from the power supply device; CD installed to move up and down as the loading device is operated in one device frame and seated in the tray Pick-up frame equipped with a pick-up device for reading the information of the information and a CD rotating device for rotating the CD seated on the tray at a predetermined speed, and the voice is installed in the lower case and transmitted from the substrate An output device for outputting a signal to an external device (e.g., a speaker or an amplifier), a cover on which one corner is rotatably installed on the upper surface of the upper case, and a cover which opens or closes the upper portion of the tray, It consists of a plurality of switches installed in.

The loading device is mounted on the device frame to rotate the loading motor capable of forward and reverse rotation when the user presses the eject button, and the rotational force is transmitted through the pulley and the reduction gear group and is picked up. The rotating member is formed with a plurality of cam grooves are inserted into the projection of the frame is rotated, the pickup frame is moved downward and the linear member is moved horizontally linearly as the rotary member is rotated, the linear member When the cover moves to a predetermined position, the cover is released from the locked state, and the cover is opened by an elastic force by a spring, and is configured to operate in the open state of the tray.

In addition, when the cover is opened as described above and the CD is replaced or newly inserted and the cover is closed, the motor for loading rotates in reverse, the rotating member rotates to move the pickup frame upward, The CD rotating device causes the CD inserted in the tray to be separated from the bottom of the tray, and when the play stop button is operated, the CD rotating device rotates the CD and the voice information stored in the CD is picked up by the pickup device. It is read and transmitted to the substrate, processed by the substrate, and output to the outside through the output device.

Conventional top-loading method CD configured as described above has a complicated structure of the loading device and a large number of components, which increases manufacturing costs and takes a lot of assembly time.

In addition, the conventional top-loading method CD is installed so that the pick-up frame and the CD rotating device is installed to move up and down as the rotating member of the loading device rotates, so that the structure is complicated and there is a gap for moving. Shaking may occur.

In the conventional top-loading method CD, the cover, the pick-up device, and the CD rotating device are separately installed in the upper case and the lower case, so that a malfunction may occur in a portion where the operation is connected, and there is a difficulty in assembling.

In addition, the conventional top-loading CD has the inconvenience of pulling out or inserting the CD and then pressing the cover directly.

An object of the present invention is to solve the above problems, to provide a top-loading type CD that the cover, the tray and the pick-up device and the CD rotating unit is integrally assembled to the case and the cover is automatically opened and closed.

Top loading method CD of the present invention is a device frame mounted to the case, a tray frame is formed on the top surface of the device frame is assembled and the CD is inserted, and one corner is rotatable on the upper surface of the tray frame And a pickup device for reading the information of the CD inserted in the tray, and a CD rotating device for rotating the CD inserted in the tray at a predetermined speed. It includes a pickup frame that is possibly installed, and a loading device that is installed in the device frame and the opening and closing the cover while rotating the pickup frame about one corner.

The loading device includes a moving member movably coupled to the device frame, a driving motor installed on the moving member and capable of forward and reverse rotation, and a rotational force of the driving motor installed on the moving member. And a power transmission means, a moving means connected to the power transmission means to move the moving member, and an opening and closing means for opening and closing the cover in association with the moving means.

The power transmission means includes a drive pulley installed on the shaft of the drive motor, a driven pulley connected through the drive pulley and the belt and rotatably installed on the moving member, and a plurality of reduction gears. Is done.

The moving means is a drive gear that rotates in combination with the reduction gear of the power transmission means, and the plurality of reduction gears are rotatably installed about the axis of the driven pulley of the power transmission means to the moving member. And a rotating member rotatably installed to the drive gear, and a rack formed on the device frame and the drive gear coupled to and moving.

The rack is composed of a horizontal portion formed in a straight line and a semicircle formed in a semicircle.

The reduction gear is connected to each of the shaft of the driven pulley and the rotating member is installed to rotate.

The opening and closing means includes a driving protrusion formed on the rotating member of the moving means, and the opening and closing member formed on the cover and the driving protrusion is inserted as the rotating member rotates to transmit rotational force.

In addition, the top-loading method CD of the present invention further includes a pickup frame moving means for moving the other edge of the pickup frame in association with the moving member of the loading apparatus.

The pickup frame moving means includes a cam groove formed in the moving member of the loading apparatus and formed of a horizontal portion and an inclined portion, and a moving protrusion formed in the pickup frame and inserted into the cam groove.

In the top loading method CD of the present invention configured as described above, when the user presses the eject button to turn on the power and withdraw or insert the CD, the driving motor of the loading device rotates forward according to the control signal of the control device. The driving member of the moving means, which has received this rotational force through the power transmission means, rotates, and the driving gear is engaged with the horizontal portion of the rack to rotate the moving member along the horizontal portion of the rack. Moves.

When the movable member moves along the horizontal portion of the rack, the movable protrusion formed on the pickup frame is inserted into the cam groove formed on the movable member, so that the movable protrusion moves downward along the inclined portion of the cam groove. The pick-up frame is rotated about one corner to separate the CD rotating device and the pick-up device from the CD inserted in the tray.

When the movable member moves as described above and the drive gear reaches the semicircular portion of the rack and moves along the semicircular portion of the rack, the movement of the movable member is stopped and rotatably installed on the movable member. The rotating member rotates about the axis of the driven pulley.

When the rotating member rotates as described above, the driving protrusion is inserted into the opening and closing member formed on the cover to rotate the opening and closing member, and the cover is centered on one edge rotatably installed on the tray frame. It is rotated and opened.

Withdrawal or insertion of the CD in the open state as described above and pressing the eject button again, the driving motor of the loading device is rotated in reverse, the drive gear of the transfer means received by the rotation is rotated in the opposite direction and the Move in the opposite direction along the semicircle of one rack.

As described above, when the driving gear moves along the semicircle of the rack, the rotating member rotates in the opposite direction, and the opening / closing member coupled to the driving protrusion rotates in the opposite direction and the cover is closed.

When the cover is closed as described above and the drive gear moves along the horizontal portion connected to the semicircle of the rack, the rotation of the rotating member is stopped and the moving member moves in the opposite direction.

When the movable member moves in the opposite direction as described above, since the movable protrusion formed in the pickup frame is inserted into the cam groove formed in the movable member, the movable protrusion moves upward along the inclined portion of the cam groove. One pick-up frame rotates about one edge to bring the CD rotating device and the pick-up device into close contact with the CD inserted in the tray.

1 is a perspective view showing an embodiment of a top loading method CD in accordance with the present invention.

Figure 2 is a perspective view showing a loading device in one embodiment of a top loading type CD in accordance with the present invention.

Figure 3 is a side view showing a loading device in one embodiment of a top loading type CD in accordance with the present invention.

Figure 4 is a plan view showing a loading device in one embodiment of a top loading type CD in accordance with the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

Figure 6 is a perspective view showing a moving member in one embodiment of a top-loading CD according to the present invention.

Figure 7 is a bottom view showing a tray in one embodiment of a top-loading CD in accordance with the present invention.

Next, the most preferred embodiment of the top-loading CDP according to the present invention will be described in detail with reference to the drawings.

First, as shown in FIGS. 1 to 4, one embodiment of the top-loading CDP according to the present invention is assembled to the device frame 10 mounted on the case 2 and the upper surface of the device frame 10. A tray frame 40 in which a tray 42, which is a space in which the CD is inserted, is formed, a cover 20 in which one corner is rotatably installed on the upper surface of the tray frame 40, and the tray 42. A pickup device 62 for reading information of the inserted CD and a CD rotating device 64 for rotating the CD inserted in the tray 42 at a predetermined speed are mounted, and one edge of the device frame 10 is mounted. Is a rotatable pick-up frame 60 and the loading device installed on the device frame 10 and the opening and closing the cover 20 while rotating the pick-up frame 60 about one corner ( 70).

In addition, in one embodiment of the top-loading CDP according to the present invention, a plurality of switches are installed on the case 2. For example, the eject button 4 used to open or remove the CD from the lid 20, the power button 7 for turning on / off the power, and the operation to search for tracks on the CD. A plurality of navigation buttons 5, a jog dial 6 for freely adjusting the rotational speed of the CD, and a joystick switch 8 for selecting and operating various functions corresponding to moving back, forth, left, and right. Install.

In the tray 42 formed on the tray frame 40, a CD rotating groove 46 into which the CD rotating device 64 is inserted is formed in the center to rotate the CD, and the information recorded on the CD is described. A pickup groove 48 for reading by the pickup device 62 is formed by connecting to the CD rotation groove 46 described above.

The loading device 70 includes a moving member 72 movably coupled to the device frame 10, a driving motor 80 installed on the moving member 72 and capable of forward and reverse rotation, and the A power transmission means installed on one moving member 72 and transmitting a rotational force of the driving motor 80, a moving means connected to the power transmission means and moving the moving member 72; It includes an opening and closing means for opening and closing the cover 20 in conjunction with the moving means.

The power transmission means is connected to the drive pulley 82 installed on the shaft 81 of the drive motor 80, the drive pulley 82 and the belt 86 and the moving member 72 It comprises a driven pulley 84 rotatably installed in the) and a plurality of reduction gears.

The plurality of reduction gears are composed of a reduction gear 89 installed on the shaft 85 of the driven pulley 84 and one or more reduction gear 87 connected to the reduction gear 89 and rotating.

As shown in FIG. 6, the movable member 72 is formed of a plate having a substantially declination shape, extends vertically from one side of the horizontal portion 73 which forms an upper surface, and one side of the horizontal portion 73 and the cam groove ( The cam portion 74 is formed, and the motor mounting portion 76 extending vertically from the horizontal portion 73 on the opposite side of the cam portion 74 and the driving motor 80 is installed.

The moving means includes a drive gear 88 which rotates in combination with the reduction gear 87 of the power transmission means, and a shaft of the driven pulley 84 of the power transmission means described above to the moving member 72. 85 is rotatably installed around the rotating member 90 and the one or more reduction gear 87 and the drive gear 88 is rotatably installed, and the device frame 10 is formed The drive gear 88 includes a rack 14 coupled to move.

The rack 14 is composed of a horizontal portion 15 formed in a straight line and a semi-circular portion 16 formed in a semicircle.

The opening / closing means includes a driving protrusion 92 formed on the rotating member 90 of the moving means, and the driving protrusion 92 formed on the cover 20 and the rotating member 90 rotates. 92 is inserted and includes an opening and closing member 24 for transmitting the rotational force.

The opening and closing member 24 is formed below the cover 20 and forms an opening and closing groove 25 into which the driving protrusion 92 is inserted.

In addition, the opening and closing member 24 is formed to form a predetermined angle with the horizontal plane in consideration of the opening angle of the cover 20.

And a semi-circular guide portion in the portion where the driven pulley 84 of the moving member 72, the motor mounting portion 76 is mounted in order to guide the rotation smoothly when the rotating member 90 is rotated 77 is formed, and the rotating member 90 is provided with a guide protrusion 94 for sliding in contact with the guide portion 77.

The guide protrusion 94 is preferably formed in a substantially memory shape or a deviator shape so as to surround the guide portion 77 because it smoothly guides the rotation of the rotating member 90.

In addition, the lower surface of the cover 20 is formed by protruding the engaging projection 38, the horizontal projection 73 of the movable member 72, the moving member 72 is moved as the moving member 72 is moved. Protruding upward from the locking projection (78) is caught or released (38).

And one embodiment of the top-loading method CD in accordance with the present invention is to cover the cover 20 in order to prevent the shock to operate at a sudden high speed when the cover 20 is opened and closed by the loading device 70 And a constant speed means for maintaining the opening speed and the closing speed of (20) constant.

As shown in FIG. 2, the constant speed means includes a spur gear 30 formed on one side of the cover 20 and a spur gear 32 which rotates in combination with the flat gear 30. The damper 34 is installed on the tray frame 40 and connected to the shaft of the spur gear 32 and filled with a fluid having a predetermined pressure.

The constant speed means configured as described above is rotated in combination with the spur gear 32 installed in the damper 34 by the fan gear 30 when the cover 20 is opened and closed. The opening and closing speed of the cover 20 is kept constant.

In addition, one embodiment of the top-loading method CD according to the present invention is a pickup frame movement to move the other edge of the pickup frame 60 in conjunction with the moving member 72 of the loading device 70 is moved It further comprises means.

As shown in FIGS. 4 to 5, the pickup frame moving means is formed in the cam member 74 of the movable member 72 of the loading apparatus 70 and is formed at a predetermined interval up and down. And a cam groove 75 formed of an inclined portion connecting one horizontal portion, and a moving protrusion 68 formed in the pickup frame 60 and inserted into the cam groove 75.

The inclined portion of the cam groove 75 when the movable member 72 moves backward (moves to the right side as seen in FIG. 5), the moving protrusion 68 moves upward, and the movable member 72 moves forward. (Moving to the left as seen in FIG. 5), the moving projection 68 is formed to move downward.

And one embodiment of the top-loading method CD in accordance with the present invention, when the cover 20 is opened to block the CD rotation groove 46 and the pickup groove 48 formed in the tray 42, the foreign matter CD Pick-up protection means for preventing the attachment of the CD rotating device 64 and the pickup device 62 through the rotary groove 46 and the pickup groove 48 further.

As shown in FIGS. 2 and 7, the pickup protection means includes a rotary bar 100 having one end rotatably fixed to a bottom surface of the tray frame 40, and the rotary bar 100. The pick-up protection plate 110 which moves as it rotates and opens or closes the CD rotating groove 46 and the pick-up groove 48 of the tray 42, and is installed on the bottom of the tray frame 40 and picked up. A pair of guide rods 114 for guiding the movement of the protective plate 110 and protruded downward on one side of the cover 20 and the rotating rod as the cover 20 is opened and closed ( And a driving member 28 for rotating the 100.

One end of the rotating rod 100 is fixed to the bottom of the tray frame 40 so as to be rotatable by a pin 102 or a bolt, and the other end of the rotating rod 100 is predetermined A moving groove 104 is formed to a length, and the pick-up protection plate 110 forms a moving protrusion 112 that is inserted into the moving groove 104 of the rotating rod 100 and slides.

In addition, the pick-up protection plate 110 is provided with a switch protrusion 116, and the bottom of the tray frame 40 is provided with a rotary switch 120 operated by the switch protrusion 116 to the pickup The protection plate 110 can be detected to open or closed.

The rotary switch 120 is provided with a sensing member 122 that is rotated by the switch projection 116 formed on the pickup protection plate 110.

The sensing member 122 is rotated by the switch protrusion 116 when the pickup protection plate 110 moves in the direction of closing the pickup groove 48, and the pickup protection plate 110 is opened in the direction in which the pickup protection plate 110 is opened. The torsion spring is installed so as to return to the original state when the pushing force of the switch protrusion 116 is removed by moving.

Next will be described the operation of the top-loading CDP according to the present invention configured as described above.

First, when the user operates the power button 7 to turn on the power and presses the eject button 4 to extract or insert the CD, the driving motor 80 of the loading device 70 according to the control signal of the control device. 3, the driving gear 88 of the above-described moving means received through the driving pulley 82, the driven pulley 84, and the reduction gears 87 and 89, which are the power transmission means, is shown in FIG. Rotate clockwise to see.

When the drive gear 88 rotates as described above, the drive gear 88 is engaged with the horizontal portion 15 of the rack 14, so that the drive gear 88 of the rack 14 The rotating member 90 and the moving member 72 provided with the driving gear 88 and the moving member 72 move forward while rotating along the horizontal portion 15 (see FIG. 3 to the left). It moves to the state shown by the double-dot chain line in the state shown by the solid line in 3 and FIG.

When the movable member 72 moves along the horizontal portion 15 of the rack 14, the pick-up frame 60 is placed in the cam groove 75 formed in the cam portion 74 of the movable member 72. Since the moving projection 68 is inserted into the moving groove 68 is moved downward along the inclined portion of the cam groove 75, the pickup frame 60 is rotated about one corner The CD rotating device 64 and the pickup device 62 are separated from the CD inserted into the tray 42.

In addition, the locking projection 78 formed on the movable member 72 is released from the state of being caught by the locking projection 38 formed on the cover 20.

As the movable member 72 continues to move as described above, the driving gear 88 rotates to reach the start point of the semicircular portion 16 of the rack 14 and thus the semicircular portion 16 of the rack 14. When moving along, the movement of the moving member 72 is stopped and the rotating member 90 rotatably installed on the moving member 72 moves the shaft 85 of the driven pulley 84. Rotate to the center

When the rotating member 90 is rotated as described above, the driving protrusion 92 is inserted into the opening and closing groove 25 of the opening and closing member 24 formed in the cover 20, the rotating member 90 As the rotation proceeds, the opening / closing member 24 is rotated (rotated in the state indicated by the double-dotted line in FIG. 3).

When the opening and closing member 24 is rotated as described above, the cover 20 is opened by rotating about one corner rotatably installed in the tray frame 40.

At this time, the driving member 28 formed on the cover 20 rotates the rotating rod 100 in the clockwise direction as shown in FIG. 6 (rotated in the state indicated by the solid line in the state indicated by the double-dotted line in FIG. 6). The pick-up protection plate 110 moves along the guide bar 114 to block the pick-up groove 48 and the CD rotation groove 46 formed in the tray 42, and the switch protrusion 116. ) Pushes the sensing member 122 of the rotary switch 120 to operate the rotary switch 120, and thus the control device stops the driving motor 80.

When the cover 20 is opened as described above, the CD is removed or inserted and the eject button 4 is pressed again, and the driving motor 80 of the loading device 70 rotates in reverse (counterclockwise as shown in FIG. 3). And the drive gear 88 of the above-described moving means rotates counterclockwise as seen in FIG. 3 and moves downward along the semicircular portion 16 of the rack 14 as shown in FIG. do.

As the drive gear 88 moves along the semicircular portion 15 of the rack 14 as described above, the rotating member 90 moves about the axis 85 of the driven pulley 84. As shown in FIG. 3, the opening / closing member 24, which is rotated counterclockwise and coupled with the driving protrusion 92, is rotated counterclockwise as shown in FIG. 3, and the cover 20 is closed.

At this time, the driving member 28 formed on the cover 20 rotates the rotating rod 100 counterclockwise as shown in FIG. 6, and the pick-up protection plate 110 is the guide rod ( 114 to move the pick-up groove 48 and the CD rotation groove 46 formed in the tray 42, the switch projection 116 is the sensing member 122 of the rotary switch 120 Falls from).

If the cover 20 is closed as described above and the drive gear 88 is retracted along the horizontal portion 14 connected to the semi-circular portion 16 of the rack 14 (moves to the right as seen in FIG. 3), The rotation of the rotating member 90 is stopped and the moving member 72 moves to the right as seen in FIG.

When the movable member 72 moves to the right as described above, the movable projection 68 formed on the pickup frame 60 inserted into the cam groove 75 formed on the cam portion 74 of the movable member 72 is moved. 5, the pickup frame 60 is rotated about one corner to move the CD rotating device 64 and the pickup device 62 along the inclined portion of the cam groove 75. In close contact with the CD inserted in one tray 42, the drive motor 80 is stopped according to the control signal of the control device.

At this time, the CD inserted into the tray 42 is fixed to the position by the pressing member 22 rotatably installed on the bottom of the CD rotating device 64 and the cover 20, the CD The rotatable device 64 is in a rotatable state.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

According to the top-loading method CD according to the present invention configured and operated as described above, since the cover and the tray are assembled to the case in an integrated state to the device frame, the assembly work is simplified and productivity is improved, and the overall structure is simple. Parts are saved.

And the loading device is automatically operated by closing the cover by operating the eject button after installing the CD, which is very convenient and does not apply excessive force to the parts.

In addition, by opening and closing the cover by gear coupling, it is stable because no sudden force is applied as compared with opening and closing the cover by using a conventional spring.

Furthermore, by providing a damper as a constant speed means, it is possible to maintain a constant opening and closing speed of the cover, so that the parts are not impacted and the service life is extended.

Claims (16)

A device frame mounted on a case, a tray frame formed on the upper surface of the device frame, and a tray which is a space into which a CD is inserted, a cover on which one edge is rotatably installed on the upper surface of the tray frame; A pickup frame equipped with a CD rotating device for rotating the CD inserted into the tray at a predetermined speed and a pickup device for reading information and rotatably installed at one corner of the device frame; Top loading type CD including a loading device for opening and closing the cover while rotating a pickup frame about one corner. According to claim 1, wherein the loading device is a movable member that is movably coupled to the apparatus frame, a drive motor installed in the movable member and capable of forward and reverse rotation, and installed in the movable member and the drive Top loading comprising a power transmission means for transmitting the rotational force of the motor, a moving means connected to the power transmission means for moving the moving member, and an opening and closing means for opening and closing the cover in conjunction with the moving means. Method CD. According to claim 2, wherein the power transmission means is a drive pulley installed on the shaft of the drive motor, driven pulley connected through the drive pulley and the belt and rotatably installed on the moving member; Top-loading method CD consisting of a reduction gear. 4. The CD of claim 3, wherein the plurality of reduction gears are formed of a reduction gear installed on the shaft of the driven pulley and one or more reduction gears connected to the reduction gear provided on the shaft of the driven pulley. . 3. The movable member according to claim 2, wherein the movable member includes a horizontal portion forming an upper surface, a cam portion extending vertically from one side of the horizontal portion, and a cam groove formed thereon, and vertically extending from the horizontal portion opposite to the cam portion. Top loading method CD consisting of a motor mounting portion is the drive motor is installed. The method according to claim 5, wherein the lower surface of the cover is formed to protrude the engaging projection, the horizontal portion of the movable member protrudes upwardly the locking projection which is caught or released to the locking projection as the movable member moves; Forming top loading CD. The method of claim 2, wherein the moving means is a drive gear that is coupled to the power transmission means for rotating, a rotating member rotatably installed on the moving member and the drive gear is rotatably installed, and Top loading type CD including a rack formed in one device frame and the drive gear is coupled to move. 8. The toploading method CD according to claim 7, wherein the rack comprises a horizontal portion formed in a straight line and a semicircle portion formed in a semicircle. According to claim 7, wherein the opening and closing means is a driving projection formed on the rotating member of the moving means, and formed on the bottom of the cover and the driving projection is inserted as the rotating member is rotated to transmit the rotational force Top loading method CD including an opening and closing member to form an opening and closing groove. [8] The tower according to claim 7, wherein a semi-circular guide portion is formed at a portion on which the driven pulley of the moving member motor mounting portion is mounted, and the rotating member forms a guide protrusion for sliding while covering the guide portion. Loading CD. According to claim 2, Top loading method CD further comprises a pickup frame moving means for moving the other edge of the pickup frame in association with the moving member of the loading device. 12. The method of claim 11, wherein the pickup frame moving means is a cam groove comprising a horizontal portion formed on the moving member of the loading device and formed at a predetermined interval up and down and the inclined portion connecting the horizontal portion, the pickup Top loading method CD including a moving protrusion formed in the frame and inserted into the cam groove. According to claim 1, wherein the fan-shaped gear formed on one side of the cover, the spur gear rotates in combination with the fan-shaped gear, and the shaft of the spur gear installed in the tray frame is connected Top loading type CD further comprising a constant speed means consisting of a damper filled with a fluid of a predetermined pressure. The apparatus of claim 1, wherein when the cover is opened, a CD rotation groove and a pickup groove formed in the tray are blocked to prevent foreign matter from being attached to the CD rotation apparatus and the pickup apparatus through the CD rotation groove and the pickup groove. Top loading method CD further comprising a pick-up protection means for. 15. The method of claim 14, wherein the pick-up protection means is a rotary bar which is fixed to the bottom of the tray frame so that one end is rotatable and the other end is formed with a moving groove of a predetermined length, the moving groove A pick-up protection plate which is inserted and slides to form a sliding projection and moves as the rotary bar rotates to open or block the CD rotation groove and the pickup groove of the tray, and is installed on the bottom of the tray frame and the pickup Top loading method CD including a guide bar for guiding the movement of the protective plate, and a drive member is formed to protrude downward on one side of the cover and rotate the rotating rod as the cover is opened and closed. The method of claim 15, wherein the pickup protection plate is provided with a switch projection, the bottom of the tray frame is provided with a rotary switch actuated by the switch projection can detect that the pickup protection plate is opened or closed. Top-loading CD.

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