Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A container for containing food or liquid is provided. The container includes a body portion, a lid and an attachment. The lid is detachably disposed on the body portion. The attachment is configured to be disposed on the lid or the body portion and includes a magnetic attraction member and a connecting structure. The magnetic attraction member is adapted to be magnetically connected to a mobile electronic device. The connecting structure is disposed between the magnetic attraction member and the container for selectively fixing the magnetic attraction member at a first position or a second position. The connecting structure includes a fastening member, and the fastening member is adapted to be detachably fastened to the body portion or the lid.

Abstract: A container for containing food or liquid is provided. The container includes a body portion, a lid and an attachment. The lid is detachably disposed on the body portion. The attachment includes a magnetic attraction member and a connecting structure. The magnetic attraction member is independent from the lid and adapted to be magnetically connected to a mobile electronic device. The connecting structure is disposed between the magnetic attraction member and the container for selectively fixing the magnetic attraction member at a first position or a second position. At least a portion of the connecting structure is fixed to the container.

Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A chair backrest includes a support frame having an inner periphery provided with a support portion which has an upper edge provided with a plurality of locking blocks, and a backrest cushion having a periphery provided with an elastic snapping portion which is snapped onto the support portion of the support frame and retained by the locking blocks of the support frame. Thus, the backrest cushion is mounted on and detached from the support frame by forcing and retracting the snapping portion of the backrest cushion, so that the chair backrest is assembled and disassembled easily and quickly without needing aid of any hand tool, thereby facilitating the user assembling and disassembling the chair backrest, and thereby facilitating the user replacing the backrest cushion.