An electronic device includes a middle frame, a display assembly, a rear member, and a protective member. The middle frame includes a sidewall disposed in an encircled manner; the display assembly is located at a front side of the middle frame; the rear member is located at a back side of the middle frame; the protective member is movably disposed on the sidewall of the middle frame. In an initial state, a front end and a rear end of the protective member are respectively lower than or flush with a surface of the display assembly or the rear member. The protective member can move toward the back side of the middle frame from the initial state to enable the rear end of the protective member to go beyond the rear member so as to protect the rear member when the electronic device falls off.

An electronic device includes a middle frame, a display assembly, a rear member, and a protective member. The middle frame includes a sidewall disposed in an encircled manner; the display assembly is located at a front side of the middle frame; the rear member is located at a back side of the middle frame; the protective member is movably disposed on the sidewall of the middle frame. In an initial state, a front end and a rear end of the protective member are respectively lower than or flush with a surface of the display assembly or the rear member. The protective member can move toward the back side of the middle frame from the initial state to enable the rear end of the protective member to go beyond the rear member so as to protect the rear member when the electronic device falls off.

A speaker includes a frame, and a vibration system and a magnetic circuit system that are fixed on the frame. The vibration system includes a first vibration diaphragm fixed to the frame, a voice coil disposed on a side of the first vibration diaphragm and configured to drive the first vibration diaphragm to vibrate to produce sound, and an elastic support part for the elastic support coil. The elastic support part includes a flexible printed circuit board connecting the voice coil to an external circuit.

A speaker includes a frame, and a vibration system and a magnetic circuit system that are fixed on the frame. The vibration system includes a first vibration diaphragm fixed to the frame, a voice coil disposed on a side of the first vibration diaphragm and configured to drive the first vibration diaphragm to vibrate to produce sound, and an elastic support part for the elastic support coil. The elastic support part includes a flexible printed circuit board connecting the voice coil to an external circuit.

An electromagnetic actuator device with a plurality of actuator units (10, 12) having in each case an armature tappet which is movable relative to a stationary coil along an axial tappet direction when said coil is energised, said actuator units being received in respectively assigned actuator housings (11, 13) such that in an installed and/or assembled state of the electromagnetic actuator device one respective end portion (16) of the armature tappets may come into engagement in a controlled manner with an actuator partner which is able to be assigned thereto, wherein the plurality of actuator units is mechanically connected to a bracket-like and/or bridge-like connecting unit (14) made of polymer material such that the actuator housings are movable relative to one another by the action and in accordance with a predetermined bending property and/or elasticity of the connecting unit, in particular in a plane perpendicular to a tappet direction of the armature tappets which are further preferably guided in an axially parallel manner to one another.

An electromagnetic actuator device with a plurality of actuator units (10, 12) having in each case an armature tappet which is movable relative to a stationary coil along an axial tappet direction when said coil is energised, said actuator units being received in respectively assigned actuator housings (11, 13) such that in an installed and/or assembled state of the electromagnetic actuator device one respective end portion (16) of the armature tappets may come into engagement in a controlled manner with an actuator partner which is able to be assigned thereto, wherein the plurality of actuator units is mechanically connected to a bracket-like and/or bridge-like connecting unit (14) made of polymer material such that the actuator housings are movable relative to one another by the action and in accordance with a predetermined bending property and/or elasticity of the connecting unit, in particular in a plane perpendicular to a tappet direction of the armature tappets which are further preferably guided in an axially parallel manner to one another.

A magnetic force control device includes a first pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an N pole of a permanent magnet, a second pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an S pole of the permanent magnet or another permanent magnet different from the permanent magnet, rotary permanent magnet configured to be rotatable to define a first arrangement state in which an N pole thereof is magnetically connected to the second pole piece and an S pole thereof is magnetically connected to the first pole piece and a second arrangement state in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece.

A magnetic force control device includes a first pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an N pole of a permanent magnet, a second pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an S pole of the permanent magnet or another permanent magnet different from the permanent magnet, rotary permanent magnet configured to be rotatable to define a first arrangement state in which an N pole thereof is magnetically connected to the second pole piece and an S pole thereof is magnetically connected to the first pole piece and a second arrangement state in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece.

In the actuator, the first end plate part of the first cover member in the support body is layered on one side in the first direction of the holder and faces the first yoke of the movable body from one side in the first direction. The second end plate part of the second cover member in the support body is layered on the other side in the first direction of the holder and faces the movable body from the other side in the first direction. Thus, the first viscoelastic member interposed between the movable body and the first end plate part in the first direction properly contacts with the movable body and the first end plate part. The second viscoelastic member interposed between the movable body and the second end plate part in the first direction properly contacts with the movable body and the second end plate part.

In the actuator, the first end plate part of the first cover member in the support body is layered on one side in the first direction of the holder and faces the first yoke of the movable body from one side in the first direction. The second end plate part of the second cover member in the support body is layered on the other side in the first direction of the holder and faces the movable body from the other side in the first direction. Thus, the first viscoelastic member interposed between the movable body and the first end plate part in the first direction properly contacts with the movable body and the first end plate part. The second viscoelastic member interposed between the movable body and the second end plate part in the first direction properly contacts with the movable body and the second end plate part.