CN2862263Y - CD player - Google Patents

Abstract

A CD-ROM player for reading/writing CD-ROM is provided with main body, upper cover and clamper. The upper cover covers the main body provided with input port of the CD-ROM. Multiple disturbing parts for disturbing and baffling partial air flow and at least one guiding part for guiding air flow are formed on the upper cover and protrude towards the main body. A coordinate system is defined, in which the projection of rotation center of the clamper on the upper cover is taken as true origin, the projection of CD-ROM input direction on the upper cover is taken as positive direction of Y-axis, and positive direction of X-axis is formed by clockwise rotating the Y-axis by 90 degrees at a viewing angle from the upper cover to the main body. The guiding part is located in a region jointly defined by positive direction of X-axis and negative direction of Y-axis. The guiding part can guide air flow to reduce collision between air flow and the CD-ROM player and among air flows, so as to suppress vibration of the CD-ROM.

Description

CD player

【Technical field】

The utility model relates to a CD player, in particular to a CD player with a vibration-damping structure, which can reduce the vibration generated when the CD rotates.

【Background technique】

With the advancement of optical storage technology, the read/write speed of optical disc players is getting faster and faster, and the speed of the motor that rotates the optical disc is the main factor affecting the read/write speed of the optical disc player. When the motor drives the disc to run at high speed, due to the friction between the disc and the air, the air velocity gradient and air pressure gradient around the disc will increase continuously. It will cause the ability of the optical reading head to read the film to decline. Therefore, vibration must be effectively suppressed to ensure that the optical disc player can stably read the information on the optical disc.

As shown in Figure 1, in order to suppress the vibration generated by the surrounding air turbulence when the disc rotates at high speed, in the existing disc player 100', a plurality of discs are usually arranged around the holder 800 of the upper cover 80 to interfere with the air flow. The interference part 802 protrudes inward from the upper cover 800 and extends along the radial direction of the optical disc 90 . When the optical disc 90 rotates at a high speed, a gradually increasing air velocity gradient is formed from the upper surface of the optical disc 90 to the lower surface of the upper cover 80, and the pressure gradient is also gradually increased. Due to the existence of the plurality of interference parts 802, when the air flow passes through the plurality of interference parts 802, the air velocity gradient and pressure gradient are eliminated to a certain extent, so the air flow from the optical disc 90 to the upper cover 80 has a relatively uniform speed, The air turbulence of the high-speed rotation of the optical disk 90 is controlled to a certain extent, which reduces the vibration to a certain extent. However, since the interference part 802 mainly plays the above-mentioned interference effect on the air flow field, but cannot effectively control the air flow direction, the stability of the optical disc 90 needs to be further improved and the vibration needs to be further reduced.

【Content of utility model】

In view of this, it is necessary to provide an optical disc player that can reduce the vibration generated when the optical disc rotates.

An optical disc player for reading/writing optical discs has a main body, an upper cover and a holder. The upper cover is covered on the main body, and the upper cover has an entrance for the optical disc to be inserted. The upper cover is protruded toward the main body with a plurality of interference parts that can interfere and block part of the airflow and at least one guide that can conform to and guide the flow direction of the airflow. department. Define a coordinate system, take the projection of the center of rotation of the gripper on the upper cover as the coordinate origin, and take the projection of the direction entering the optical disc player through the entrance on the upper cover as the positive ordinate, and observe from the upper cover toward the main body, The positive direction of the abscissa is formed by rotating 90 degrees clockwise from the position of the ordinate, and the guide part is located in the area jointly defined by the positive direction of the abscissa and the negative direction of the ordinate of the coordinate system.

Compared with the prior art, the upper cover of the optical disc player is provided with an interference part and a guide part, the interference part is used to interfere with the airflow field, and the guide part is used to guide the airflow to reduce the gap between the airflow and the CD player and between the airflows. The impact improves the stability of the airflow and suppresses the vibration of the disc.

【Description of drawings】

Fig. 1 is a perspective view of a conventional optical disc player with a vibration-damping structure.

Fig. 2 is a perspective view of a disc player with a vibration-damping structure in a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of an upper cover of the optical disc player in FIG. 2 .

Fig. 4 is a diagram of the vibration waveform of the optical disc when the optical disc player in a preferred embodiment of the present invention is in use.

Fig. 5 is a schematic diagram of an upper cover of an optical disc player whose vibration-damping structure is three interfering parts.

Fig. 6 is a waveform diagram of disc vibration when the disc player adopting the upper cover of Fig. 5 is in use.

FIG. 7 is a schematic diagram of the top cover of the optical disc player whose vibration-damping structure in FIG. 1 is four interference parts.

Fig. 8 is a waveform diagram of disc vibration when the disc player adopting the top cover of Fig. 7 is in use.

【Detailed ways】

Please refer to FIG. 2 , which is an optical disc player 100 for reading/writing optical discs in a preferred embodiment, including an upper cover 20 , a main body 30 and a lower case 40 . The upper cover 20 is provided with a holder 200 , interference parts 202 , 204 , 206 distributed around the holder 200 , a guide part 208 and an entrance 209 for inserting the optical disc 50 into the optical disc player 100 . The interference parts 202 , 204 , 206 and the guide part 208 are set within a range corresponding to 0.5 times to 1.1 times the radius of the optical disc 50 . Please also refer to FIG. 3 . Obviously, the center of rotation O of the clamper 200 is coaxial with the center of rotation O' of the optical disc 50 in the optical disc player 100 . The interfering parts 202 , 204 , 206 and the guiding part 208 are punched from the upper cover 20 toward the interior of the optical disc player 100 . Here, the concept of a coordinate system in mathematics is introduced to clearly illustrate the specific positions of the embossed structures on the upper cover 20 . The coordinate system XOY takes the projection of the center of rotation O on the upper cover 20 as the coordinate origin, and takes the projection of the direction entering the optical disc player 100 through the entrance 209 on the upper cover 20 as the positive direction of the vertical coordinate Y, from the upper cover 20 Looking in the direction of the main body 30, rotate 90 degrees clockwise from the ordinate Y position to form the positive direction of the abscissa X, and the first, second, third and fourth quadrants divided by it are set in accordance with the conventional order, among which, the third and the third Four quadrants are adjacent to the inlet 209 , the third quadrant is located in the direction of the airflow away from the inlet 209 , and the fourth quadrant is located in the direction of the airflow towards the inlet 209 . The interference parts 202, 204, 206 and the guide part 208 are respectively located in the third, second, first and fourth quadrants, and the interference parts 202, 204, 206 extend from the center of rotation O of the clamper 200 substantially along the radial direction of the optical disc 50 The interference parts 202 and 204 are substantially symmetrically arranged on both sides of the abscissa X and are separated from each other by 60 degrees. The interference parts 204 and 206 are substantially symmetrically arranged on both sides of the vertical coordinate Y and are separated by 120 degrees from each other. The interfering parts 202 and 206 are basically parallel, the guiding part 208 forms an included angle of 60 degrees with the positive direction of the ordinate Y, the interfering part 202 forms an included angle of 60 degrees with the negative direction of the ordinate Y, and the interfering part 206 forms an included angle of 60 degrees with the positive direction of the ordinate Y angle. The length of the interference part 202 and the guide part 208 is 38 mm, the width is 6 mm, and the thickness is 3 mm. The length of the interference parts 204 and 206 is 31 mm, the width is 6 mm, and the thickness is 3 mm. Both the main body 30 and the lower case 40 are substantially the same as the existing optical disc player, so the detailed structure thereof will not be repeated.

Please refer to FIG. 3 again, which shows the airflow passing through the guide part 208 when the optical disc 50 rotates at high speed in the optical disc player 100 . After the optical disk 50 enters the optical disk player 100 from the entrance 209, it rubs against the surrounding air during high-speed rotation, so that the air flow speed is accelerated. Due to the interference of the interference parts 202, 204, and 206, the velocity gradient and pressure gradient of the air flow are gradually eliminated. The airflow of the interfering part 206 is guided by the guide part 208 and divided into two parts, which flow from the inner and outer sides of the guide part 208 respectively (the area between the guide part 28 and the center of rotation O is the inner side, and the area between the guide part 209 and the inlet 209 is the outer side). Flowing through, the airflow flowing from the outside of the guide part 208 collides with the panel (not shown) arranged at the inlet 209 and bounces back, and the rebounded airflow will not directly interact with the part of the airflow flowing through the inside of the guide part 208. Instead, the flow follows the rotation direction of the optical disc 50 , so that the pressure distribution on the optical disc 50 can be more uniform, and the effect of stabilizing the optical disc 50 can be achieved. FIG. 4 shows a vibration waveform measured by a laser displacement meter when the optical disc 50 rotates at a high speed in the optical disc player 100 after using the vibration-damping structure of this embodiment. It should be noted that high-frequency clutter will occur when measuring with a laser displacement meter, so the high-frequency clutter will be eliminated by using the filter function of the oscilloscope. Therefore, the high frequency can be ignored, and only the low frequency variation on the disc can be observed. The upper waveform in Fig. 4 represents the original quantity test signal, and the lower waveform represents the condition of the original quantity test signal after the high-frequency signal is filtered. When the laser displacement meter measures the vibration change of the disc, the voltage change it reflects can be converted into displacement (mm), where the vertical axis is the voltage (v): 1 large division represents 0.1v voltage (equivalent to 0.1mm), and 1 small division Represents 0.02v (equivalent to 0.02mm), and the horizontal axis is time (s): 1 large grid represents 20s, 1 small grid represents 4s, and the total measurement time is 200s. It can be known from this that after using the damping structure of this embodiment, the vibration of the optical disc 50 during high-speed rotation is relatively small, and within the test time of 200s, the maximum vibration displacement at different times appears at 0.05mm at A and at B. 0.03mm.

In order to further illustrate the better effect achieved by the vibration-damping structure of this embodiment, the designer provided a reference structure as shown in Figure 5 for comparison of test effects, and provided its use as shown in Figure 6 Loaded vibration waveform diagram.

Please refer to Fig. 5, the upper cover 60 of the optical disc player (not shown) is only provided with three interference parts 602, 604, 606 in the third, second and first quadrants, and the fourth quadrant is not provided with any spoiler or diversion structure . When the optical disk 70 rotates at a high speed, the velocity gradient and the pressure gradient of the airflow are gradually eliminated due to the interference effect of the interference parts 602 , 604 , and 606 . And when the airflow flows into the fourth quadrant area, because there is neither a spoiler structure nor a flow guide structure, part of the airflow directly hits the panel (not shown) at the entrance 609 and bounces back, and the airflow after the bounce is the same as normal Part of the flowing air strikes, making it difficult to control the air flow here. After the airflow passes through the optical disk 70 and continues to accelerate, it then flows to the interference part 602 located in the third quadrant. The interference part 602 plays a role of stabilizing the airflow to a certain extent. Since the turbulent flow in the fourth quadrant region increases, the resulting vibration becomes larger, resulting in instability of the optical disk 70 at this local position, and thus an unstable situation of the entire rotation of the optical disk 70 . It can be known from the vibration waveform diagram shown in FIG. 6 that after using the upper cover 60 of the vibration-damping structure shown in FIG. The maximum vibration displacement occurs at 0.12 mm at C and 0.06 mm at D, which is higher than the vibration displacement of the optical disc 50 of the optical disc player 100 having the vibration-damping structure of three interference parts and one guide part in this embodiment. big.

Now this embodiment is compared with the vibration situation of the upper cover 80 of the optical disc player (not shown) having a vibration-damping structure as shown in FIG. achieve better results.

Please refer to Fig. 7, the loam cake 80 of existing CD player (not shown in this figure) all arranges interference part 802 in four quadrants, because the interference effect of these four interference parts 802, the velocity gradient and the pressure gradient of air-flow However, due to the absence of the guiding effect of the air guide structure, part of the airflow directly hits the panel (not shown) at the inlet 809 and rebounds, and the rebounded airflow will collide with the airflow that originally crossed the interference part 802, resulting in The airflow is also difficult to get better control here. From the vibration waveform diagram shown in Figure 8, it can be known that after the upper cover of the vibration-damping structure shown in Figure 8 is adopted, when the optical disc 90 rotates at high speed in the optical disc player, the maximum vibration displacement at different times appears at 0.05 of E. 0.1mm at mm and F, although the vibration damping effect (0.12mm, 0.06mm) of the vibration damping structure shown in Fig. ) is still not ideal.

It can be understood that, first, the above-mentioned interference parts 202, 204, 206 and guide part 208 can be integrally punched and protruded from the upper cover 20, or can be formed by fixing the produced bumps on the upper cover 20 . 2. The interfering parts 202, 204, 206 and the guiding part 208 may not only be in the shape of a cuboid, but also other elongated shapes such as waves, and their cross-sections may be square, circular or other shapes. 3. The respective dimensions of the interference parts 202, 204, 206 and the guide part 208 should satisfy: the length is greater than 25 mm, and the width and height are greater than 3 mm. 4. The guiding part 208 can be set not only in the fourth quadrant, but also in other quadrants or across quadrants. The interference parts 202, 204, 206 can be set not only in their respective quadrants, but also in the fourth quadrant. The angle between the interfering parts 202 and 204 and between the interfering parts 204 and 206 is not limited to 60 degrees or 120 degrees, and may be any angle between 0 and 180 degrees. 5. The holder 200 can be connected with the upper cover 20, or can be installed on a separate bracket.

Those of ordinary skill in the art can make other equivalent replacements or apply to similar fields according to the technical solution of the utility model, and all these replacements or applications should belong to the protection scope of the utility model.

Claims (8)

1. An optical disc player for reading/writing optical discs, the optical disc player has a main body, an upper cover and a holder, the upper cover is covered on the main body, and the upper cover has a The entrance where the optical disc is inserted, the upper cover protrudes toward the main body with a plurality of interference parts that can interfere and block part of the airflow, define a coordinate system, and take the projection of the center of rotation of the holder on the upper cover as The origin of the coordinates, the projection of the direction of entering the optical disc player through the entrance on the upper cover is the positive direction of the ordinate, viewed from the upper cover towards the main body, and rotated 90 degrees clockwise from the position of the ordinate to form the positive direction of the abscissa , it is characterized in that: the upper cover is also convexly provided with at least one guide part that can conform to and guide the flow direction of the airflow toward the main body, and the guide part is jointly defined by the positive direction of the abscissa and the negative direction of the ordinate of the coordinate system within the area. 2. The optical disc player according to claim 1, wherein the interference part and the guide part are set within a range corresponding to 0.5 times to 1.1 times the radius of the optical disc. 3. The optical disc player according to claim 1, wherein the interfering part and the guiding part are long strips, the length of which is greater than or equal to 25 mm, and the width and thickness of which are both greater than or equal to 3 mm. 4. The optical disc player according to claim 1, wherein the guiding part is parallel to at least one of the plurality of interfering parts, and is arranged on opposite sides of the ordinate. 5 . The optical disc player according to claim 4 , wherein the guiding part is parallel to the other one of the plurality of interfering parts and is arranged on opposite sides of the abscissa. 5 . 6. The optical disc player according to claim 5, wherein the guide part forms an included angle of 60 degrees with the positive direction of the ordinate. 7 . The optical disc player according to claim 6 , wherein at least one of the interference parts is arranged at a diagonal position of the guide part and forms an angle of 60 degrees with the positive direction of the ordinate. 8 . 8. The optical disc player according to claim 7, characterized in that: the guide part has a length of 38 mm, a width of 6 mm, and a thickness of 3 mm, and at least one of the plurality of interference parts has a size equal to that of the guide part , the length of other interference parts is 31mm, the width is 6mm, and the thickness is 3mm.

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