Abstract: A magnetic circuit for coaxial speaker includes a first magnetic unit, at least one second magnetic unit arranged around the first magnetic unit and at least one third magnetic unit arranged around the at least one second magnetic unit. The magnetic pole arrangement of the second magnetic unit is reversed to the magnetic pole arrangement of the first magnetic unit and the third magnetic unit, enabling a first magnetic loop to be established between the first magnetic unit and the at least one second magnetic unit and a second magnetic loop to be established between the at least one second magnetic unit and the at least one third magnetic unit. The magnetic circuit is practical for use in the inner and outer drivers of a coaxial speaker, providing uniform magnetic field distribution, and facilitating speaker miniaturization.

Abstract: A diaphragm surround manufacturing method includes: mixing a molten plastic and a gas in supercritical fluid state in a feed pipe of an injector to form a mixture; filling a die with the mixture thus formed and controlling pressure and temperature of the die to cause the gas to diffuse and nucleate inside the die and develop a plurality of bubbles; and reducing the temperature of the die to cause the plastic to cure and form a microcellular foam structure. Accordingly, the surround manufactured by the manufacturing method has equal foam cell diameters and uniform foam cell distribution so as to enhance the tensile strength of the surround, enable a diaphragm with the surround to perform well at low frequencies, and extend the service life of the diaphragm.

Abstract: An external-magnet-type magnetic circuit includes an iron core and at least one composite magnet coaxially mounted around the iron core. The composite magnet has two magnetic poles with field directions thereof substantially perpendicular to each other, wherein one of the magnetic poles has the field direction thereof pointing to the iron core, and a magnetism-guiding plate being deposited on the other magnetic pole of the composite magnet and being separated from the iron core by a magnetic gap. Thereby, the composite magnet provides high magnetic flux density in relatively small volume, without the additional use of any magnetism-guiding yokes, and thus is particularly suitable for small-size amplifiers where it helps to improve acoustic sensitivity and acoustic output performance.

Abstract: A magnetic circuit for coaxial speaker includes a first magnetic unit, at least one second magnetic unit arranged around the first magnetic unit and at least one third magnetic unit arranged around the at least one second magnetic unit. The magnetic pole arrangement of the second magnetic unit is reversed to the magnetic pole arrangement of the first magnetic unit and the second magnetic unit, enabling a first magnetic loop to be established between the first magnetic unit and the at least one second magnetic unit and a second magnetic loop to be established between the at least one second magnetic unit and the at least one third magnetic unit. The magnetic circuit is practical for use in the inner and outer drivers of a coaxial speaker, providing uniform magnetic field distribution, and facilitating speaker miniaturization.

Abstract: Provided is a composite diaphragm which includes a base layer and at least a graphyne including layer. The base layer has a central portion and a peripheral portion disposed at the periphery of the central portion. The graphyne including layer is disposed on the surface of the base layer. As graphyne is a lightweight and highly rigid material with a two-dimensional structure, composite diaphragms made of graphyne manifest characteristics, such as high stiffness, high toughness and low density, and thus achieve high practicability, such as high durability and high capability of producing high-definition tone.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis and having a bended part on a front end thereof; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover; a door mounted on the front end of the tray; a double-layered retaining plate having a first retaining plate and a second retaining plate located respectively on both front and rear sides of the bended part. The bended part is located behind the faceplate, and a space is formed between the bended part and the faceplate.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis and having a bended part on a front end thereof; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover; a door mounted on the front end of the tray; a double-layered retaining plate having a first retaining plate and a second retaining plate located respectively on both front and rear sides of the bended part.

Abstract: A spindle motor includes a base plate, a stator, and a rotor. The base plate has a plurality of air-guiding holes. The stator includes a bearing portion and a plurality of coil portions. The bearing portion is fixed on the base plate. The coil portions are connected to and surrounded the bearing portion, and are disposed above the air-guiding holes. The rotor is rotatably mounted to the bearing portion and disposed adjacent the coil portions.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover and having a first inclined plane; a door mounted on the front end of the tray and having a second inclined plane with a gap opposite to the first inclined plane for forming an inclined directed channel between the faceplate and the door.

Abstract: A method for reading/writing data of a disk drive that includes a spindle motor for rotating a disk and a head for reading/writing data from and to the disk. The method includes the steps of; (i) adjusting a position of the head for the first time to space apart the head from a center of the disk at a specific distance, wherein when the head is spaced apart from the center of the disk at the specific distance, the disk vibrates at the minimum magnitude during raising operation of the spindle motor from a low speed to a high speed; (ii) raising the spindle motor from the low speed to the high speed; and (iii) adjusting a position of the head for the second time to move the head to a desired track in the disk for reading/writing data in the desired track.

Abstract: A spindle motor includes a base plate, a stator, and a rotor. The base plate has a plurality of air-guiding holes. The stator includes a bearing portion and a plurality of coil portions. The bearing portion is fixed on the base plate. The coil portions are connected to and surrounded the bearing portion, and are disposed above the air-guiding holes. The rotor is rotatably mounted to the bearing portion and disposed adjacent the coil portions.

Abstract: A heat-dissipating structure of a disc drive comprises a tray and a diversion plate. The tray has a body with a concavity loading surface for loading a disc to be in and out the disc drive, and the loading surface has a central hole. Further the diversion plate is disposed on one side of the loading surface, and connected to the loading surface, wherein the diversion plate extends downward and slopes from the connection of the diversion plate and the loading surface.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover and having a first inclined plane; a door mounted on the front end of the tray and having a second inclined plane with a gap opposite to the first inclined plane for forming an inclined directed channel between the faceplate and the door.

Abstract: A method for reading/writing data of a disk drive that includes a spindle motor for rotating a disk and a head for reading/writing data from and to the disk. The method includes the steps of; (i) adjusting a position of the head for the first time to space apart the head from a center of the disk at a specific distance, wherein when the head is spaced apart from the center of the disk at the specific distance, the disk vibrates at the minimum magnitude during raising operation of the spindle motor from a low speed to a high speed; (ii) raising the spindle motor from the low speed to the high speed; and (iii) adjusting a position of the head for the second time to move the head to a desired track in the disk for reading/writing data in the desired track.

Abstract: An optical disk drive is disclosed. The distance between the surface of the optical disk and the inner upper surface of the optical disk drive is less than 3.5 mm while performing the data reading or writing procedures on the optical disk loaded in the optical disk drive.

Abstract: The present invention relates to a mechanism for guiding airflows within an optical disc drive, in which the optical disc drive comprises a chassis having a side wall and a tray for loading or unloading a disc. The guide mechanism of the present invention includes at least one guide passage which is protruded outwardly from the side wall of the chassis and has two guiding oblique surfaces at its both ends. Further, the guide passage is positioned on an extended line of a diameter of the disc normal to the side wall of the chassis. The airflows produced by the revolving disc is guided to flow through the guide passage. According to the guide mechanism the shocks, jarring, and noise of the optical disc drive is minimized.

Abstract: A portable electronic apparatus includes a host module including a first housing, a first fixing device installed on the first housing, and a host installed inside the first housing for controlling operation of the portable electronic apparatus. The portable electronic apparatus further includes a display module including a second housing, a second fixing device installed on the second housing for detachably connecting with the first fixing device in a tight fit manner, and a screen installed inside the second housing and electrically connected to the host for displaying images corresponding to image signals transmitted from the host. The portable electronic apparatus further includes a connecting component. A first end of the connecting component is connected to the first housing in a rotatable manner, and a second end of the connecting component is fixed to the second housing.

Abstract: A heat-dissipating structure of a disc drive comprises a tray and a diversion plate. The tray has a body with a concavity loading surface for loading a disc to be in and out the disc drive, and the loading surface has a central hole. Further the diversion plate is disposed on one side of the loading surface, and connected to the loading surface, wherein the diversion plate extends downward and slopes from the connection of the diversion plate and the loading surface.

Abstract: An optical disc drive for reading data stored in an optical disc is provided. The optical disc drive includes a housing, a front panel, a crashworthy portion and a reading module. The housing has a first opening and the front panel is disposed across the first opening. The front panel has a second opening suitable for taking the optical disc into the housing. The reading module is disposed inside the housing for reading stored data from the optical disc. The crashworthy portion is disposed on the inner wall of the front panel and located in an area above the second opening. The surface of the crashworthy portion that faces the interior of the optical disc drive is an inclined surface.

Abstract: A portable electronic apparatus includes a host module including a first housing, a first fixing device installed on the first housing, and a host installed inside the first housing for controlling operation of the portable electronic apparatus. The portable electronic apparatus further includes a display module including a second housing, a second fixing device installed on the second housing for detachably connecting with the first fixing device in a tight fit manner, and a screen installed inside the second housing and electrically connected to the host for displaying images corresponding to image signals transmitted from the host. The portable electronic apparatus further includes a connecting component. A first end of the connecting component is connected to the first housing in a rotatable manner, and a second end of the connecting component is fixed to the second housing.