Abstract: A speaker is provided and includes a first speaker body, a second speaker body, a speaker component, and a sound transmission member. The first speaker body has a first chamber. The second speaker body has a second chamber. The second speaker body is received in the first chamber and defines a resonant cavity in the first chamber. The speaker component is disposed on the second speaker body and includes a supporting member, a magnet, a coil, and a diaphragm. Two ends of the supporting member are respectively inserted into the second chamber and fixed on the second speaker body. The magnet is disposed in the supporting member. The diaphragm is disposed on the supporting member and abuts against the second speaker body. The coil is received in the magnet and is connected to the diaphragm. The sound transmission member is coaxially disposed in the resonant cavity with the speaker component.

Abstract: A speaker apparatus includes an enclosure, a speaker unit, and a bass reinforcement unit. The enclosure includes an inner cavity, where a cavity volume of the inner cavity is in a range of 0.5 milliliter to 1 milliliter, the enclosure has a cavity acoustic compliance value, and the cavity acoustic compliance value is obtained by dividing the cavity volume by a product of air density and a sound velocity squared. The speaker unit includes a diaphragm and a surround, the speaker unit has a speaker acoustic compliance value and an effective sound outlet area, and the speaker acoustic compliance value is a product of a mechanical compliance value of the surround and the effective sound outlet area squared, and a ratio of the speaker acoustic compliance value to the cavity acoustic compliance value is less than or equal to 1. The bass reinforcement unit outputs a low-frequency response frequency.

Abstract: An anti-derail transmission mechanism for an optical pickup. A connection portion is connected to the optical pickup. An engaging portion is disposed on the connection portion. A first abutting portion on the connection portion and a second abutting portion on the engaging portion forms a clearance therebetween. An elastic element is disposed between the connection portion and the engaging portion, pressing the engaging portion toward a screw rod. The screw rod is disposed on a side of the engaging portion opposite to the connection portion, comprising a threaded portion detachably engaged to the engaging portion. When the screw rod rotates, the threaded portion leads the engaging portion and the connection portion to move straightly along an axial direction of the screw rod. Length of the clearance is shorter than depth of the engagement of the threaded portion and the engaging portion.

Abstract: The present invention relates to an apparatus for connecting a transmission device to an optical pick-up. The transmission device includes a connecting unit and a lead screw and a driving unit. The connecting unit includes a main portion, an elastic portion, a tooth-like portion and a restriction portion. The restriction portion limits the elastic portion to move within a range of a first value. The lead screw engages with the tooth-like portion. A maximum engagement depth between the lead screw and the tooth-like portion is a second value. The second value is larger than the first value to prevent the lead screw and the tooth-like portion from disengaging.

Abstract: A shock absorber used for absorbing shock energy generated by a vibrator positioned on a connecting plate is disclosed. The shock absorber has a column, a support plate and a cover plate. The column has an upper damper, a neck zone, a lower damper and a through hole. The neck zone is connected to the connecting plate. The cover plate is positioned above and covered the upper damper and the support plate is located below the lower damper for holding the column. A cylinder is connected to the support plate via the through hole so as to secure the column and the vibrator with the support plate. Furthermore, the neck zone has at least one groove to reduce a contacting area between the neck zone and the connecting plate so as to reduce a horizontal vibration frequency of the column in a horizontal direction.

Abstract: The present invention relates to an apparatus for connecting a transmission device to an optical pick-up. The transmission device includes a connecting unit and a lead screw and a driving unit. The connecting unit includes a main portion, an elastic portion, a tooth-like portion and a restriction portion. The restriction portion limits the elastic portion to move within a range of a first value. The lead screw engages with the tooth-like portion. A maximum engagement depth between the lead screw and the tooth-like portion is a second value. The second value is larger than the first value to prevent the lead screw and the tooth-like portion from disengaging.