An electronic device includes a substrate having a connector formed on a main face, and a module having a terminal detachably connected to the connector of the substrate. The module includes an extended part which projects below the terminal in an installation direction. The substrate includes a bypass part which bypasses the extended part when the module is connected to the substrate. The bypass part is a cutout or a recess formed in the substrate. The extended part accommodates a plurality of components aligned in the installation direction. The extended part is extended from the lower end of the module by a difference between a first size, corresponding to multiple times the size of each component, and a second size ranging from the upper end of the module to the end of the terminal.

A printed circuit board includes: a first insulating substrate having a mounting hole that penetrates through the first insulating substrate from a first surface to a second surface; a second insulating substrate including a connection portion; a first electrode provided on the second surface and disposed at an edge of the mounting hole; a second electrode provided on the connection portion and joined to the first electrode; and an electronic component provided on the second surface. A center of mass of the second insulating substrate is disposed on the first surface of the first insulating substrate. A center of mass of the electronic component is disposed on the second surface of the first insulating substrate. The electronic component has a weight equivalent to a weight of the second insulating substrate.

Daughter card assembly including a circuit board and leading and trailing connectors mounted to the circuit board. The leading and trailing connectors have mating ends that face in different directions along a board plane. The daughter card assembly also includes a support wall that is coupled to the circuit board and extends orthogonal to the circuit board. The support wall has a wall opening therethrough. The trailing connector is positioned on the circuit board such that the mating end substantially aligns with the wall opening. The daughter card assembly also includes a retention shroud that projects from an exterior surface of the support wall. The retention shroud defines a shroud passage that aligns with the wall opening. The shroud and wall openings form a receiving passage for receiving at least one of the trailing connector or a corresponding cable connector that mates with the trailing connector.

An expansion card cage includes a cage body and a stopper. The cage body includes a first side plate, a second side plate, and a third side plate. The first side plate is configured for installations of a riser card and an expansion card. The second side plate and the third side plate respectively extend along two opposite directions from the second side plate. The third side plate has a contact surface and two mount portions protruding from the contact surface, and the contact surface is in contact with the expansion card. Two opposite sides of the stopper are respectively and pivotally connected to the two mount portions of the third side plate. A pivot axis of the stopper is parallel to a longitudinal axis of the third side plate, and the stopper is in contact with a side of the expansion card away from the contact surface.

A control module attached to a lighting fixture and having a front cover portion may comprise one or more sensors, such as a daylight and/or occupancy sensor, for sensing information through the front cover portion. The control module may have a main printed circuit board (PCB) that extends from a front side to a rear side of the control module, and a sensor PCB perpendicular to the main PCB to enable at least one sensor attached to the sensor PCB to face the front side of the control module. The main PCB may comprise a wireless communication circuit and an antenna for communicating radio frequency (RF) signals, wherein at least a portion of the antenna is located within a plastic lip of the front cover portion of the control module. The control module may further have a conductive enclosure to reduce radio-frequency interference noise from coupling into the antenna.

An electronic device includes a slot, and a backboard that is disposed on the depth side in the slot and is electrically connected to a printed circuit board inserted in the slot. The electronic device further includes a casing having the slot formed therein, the casing being configured to accommodate therein at least part of the backboard, and a cover member configured to be attachable to and removable from the casing. When attached to the casing, the cover member together with the casing forms the external appearance of the electronic device. The cover member is attached to the backboard integrally.

A printed circuit board includes a connector insertion area including many rows of crimping holes, each row of crimping holes includes at least two pairs of signal crimping holes (SCHs), and each pair of SCHs includes two SCHs. In a row arrangement direction of the crimping holes, at least one ground crimping hole (GCH) is arranged on either side of each pair of SCHs. A depth of the GCH is greater than or equal to a depth of the SCH, the GCH includes a main hole and a shielding component on at least one side of the main hole, a part of a side wall of the main hole is a part of a side wall of the shielding component, and a sum of lengths of the main hole and the shielding component in a first direction is greater than a length of the SCHs in the first direction.

An electrical connector includes: an insulating housing; and plural terminals held in the insulating housing and arranged in terminal pairs, each of the terminals including: a holding portion held in the insulating housing; a cantilever extending forward from the holding portion, a slot being provided on the cantilever; a contact portion at a front of the cantilever; and a mounting portion for mounting on a circuit board; wherein the slot extends to the contact portion; and in each terminal pair, a first distance from a center of the contact portion of one terminal thereof to a center of the contact portion of the other terminal thereof is less than a second distance from a center of the mounting portion of one terminal thereof to a center of the mounting portion of the other terminal thereof.

A circuit module includes a circuit module substrate having an area smaller than a large-scale circuit board, an electronic circuit component mounted on the circuit module substrate, a connection pin provided to the circuit module substrate, and a circuit-module-substrate-side fitting structure part provided to the circuit module substrate. A pin receptacle and the connection pin are electrically connected to each other. A non-conductive thermal adhesive layer is formed between a surface of the circuit module substrate and a surface of a base material of the large-scale circuit board facing to each other, the non-conductive thermal adhesive layer electrically insulating and thermally joining the surfaces by a non-conductive thermally conductive material.

The disclosure provides a layout method for backplane connector, a backplane, and an electronic terminal. The backplane includes: a circuit board; and a first connector unit. The first connector unit includes at least one group of first connector modules, each group of the first connector modules comprises a front connector and a back connector; pins in odd-numbered columns of the front connector have the same arrangement as pins in odd-numbered columns of the back connector, pins in even-numbered columns of the front connector have the same arrangement as pins in even-numbered columns of the back connector; the front connector is mounted on the front of the circuit board, the back connector is on the back of the circuit board, and the back connector is staggered one column of pins relative to the front of the front connector.