The invention relates to an assembled structure of a main spectacle frame and an assistant lens frame. Sliding slots having fixing parts are disposed on inner sides of the lens frame of the main spectacle frame. Through holes are disposed in front of the lens frame and positioned to correspond to the sliding slots. The assistant lens frame is disposed on the front side of the lens frame of the main spectacle frame. Positioning bumps are protrudingly disposed on inner sides of the assistant lens frame to correspond to the through holes on two sides of the lens frame of the main spectacle frame. Tip holes are disposed on lateral sides of the positioning bumps to be inserted by tip rods for positioning correspondingly.

An eyeglass apparatus comprises left and right eyeglass portions and a link. The link is configured to permit the eyeglass apparatus to transition between an extended configuration and a collapsed configuration. In the extended configuration, the eyeglass apparatus is adapted to be worn by a user in a conventional eyeglass wearing orientation. In the collapsed configuration: an inwardly facing lens face of one of left and right lenses faces an outwardly facing lens face of the other of the left and right lenses; a medial edge portion of the left lens is closer to a medial edge portion of the right lens than to a lateral edge portion of the right lens; and the lateral edge portion of the left lens is closer to the lateral edge portion of the right lens than to the medial edge portion of the right lens.

Elastic hinge for eyeglass frames, provided with two pivot elements hinged together by means of a pin. A first pivot element is provided with an elastic device comprising a carriage provided, at an external end thereof, with a head portion having a first hole which is extended passing between its two lateral faces. A second pivot element comprises two shoulders provided with second holes and delimiting a slit between them in which the head portion is inserted. The head portion comprises a tilted slide surface, which is extended towards the external end of the carriage on at least one of the lateral faces of the head portion directed towards the head of the pin, covering at least one area adjacent to the first through hole.

The present invention relates to a wavy structure of a spectacle frame, and the technical object of the present invention is to provide a wavy structure of a spectacle frame which is compatible to multiple different lenses, is convenient to install, and is firm and stable when in use. The wavy structure of the present invention includes a spectacle lens frame and frame temple, and an inner ring of the spectacle lens frame is shaped as a wavy structure. The present invention not only has elasticity and can be compatible to lens of different models, but also can firmly stabilize the lens, and is applied to the production and use of man-rated spectacle field.

An eyeglass apparatus comprises left and right eyeglass portions and a link. The link is configured to permit the eyeglass apparatus to transition between an extended configuration and a collapsed configuration. In the extended configuration, the eyeglass apparatus is adapted to be worn by a user in a conventional eyeglass wearing orientation. In the collapsed configuration: an inwardly facing lens face of one of left and right lenses faces an outwardly facing lens face of the other of the left and right lenses; a medial edge portion of the left lens is closer to a medial edge portion of the right lens than to a lateral edge portion of the right lens; and the lateral edge portion of the left lens is closer to the lateral edge portion of the right lens than to the medial edge portion of the right lens.

A head mounted display device includes a host, two sliding parts, two locking parts and two brackets. The host has two connecting bases located on opposite sides of the host. The two sliding parts are respectively slidably connected to the corresponding connecting base. The two locking parts are respectively used to lock the corresponding sliding part in a retracted position or a pulled-out position relative to the corresponding connecting base. The two brackets are respectively pivotally connected to one end of the corresponding sliding part away from the host.