A head-mounted fixing device includes: a head frame including two side frame portions, and a front frame portion located between the two side frame portions and connected to the two side frame portions, and the two side frame portions and the front frame portion being made of rigid materials; an elastic piece including one end connected to the front frame portion; a headgear including an arc portion and a top portion, wherein two ends of the arc portion are respectively connected to the two side frame portions, one end of the top portion is connected to another end of the elastic piece, and another end of the top portion is connected to the arc portion; it is characterized in that the front frame portion is used to abut against a user's forehead to provide a fulcrum.

A screen magnifier includes a magnifier body and a mounting seat. The magnifier body includes a magnifying glass. A rotating shaft is disposed on the magnifier body. The rotating shaft is disposed perpendicular to a glass surface of the magnifying glass. Mounting holes are on the mounting seat. The rotating shaft is movably connected with the mounting holes. The mounting holes extend along a horizontal direction. The rotating shaft is disposed in the mounting holes. The magnifier body rotated around an axis of the rotating shaft, and the magnifier body is switched between a horizontal position and a vertical position by rotating.

An optical instrument indexing device includes a riser and first and second platform. The first platform is disposed on a first side of the riser at a first position on the riser. The second platform disposed on a second side of the riser at a second position on the riser. Both the first and second platforms are indexed or indexable to align two optical instruments to a field of view.

The image display device includes an image generating unit that emits first image light, a pupil expanding element that expands a diameter of a light flux included in the first image light from the image generating unit to obtain second image light, a first light condensing optical system that condenses the second image light and forms an intermediate image, and a second light condensing optical system that condenses light from the intermediate image and generates a virtual image on eye of a viewer, in a plane including at least the image generating unit, the pupil expanding element, and the eye of the viewer, a maximum emission angle of the first image light is smaller than a maximum viewing angle of the virtual image, and the diameter of the light flux included in the second image light is greater than that of a light flux included in the virtual image.

An optical system for displaying a magnified virtual image of an image emitted by a display to a viewer. The optical system includes first and second lenses facing each other and spaced apart by an air gap to define an optical cavity therebetween. The optical cavity includes a reflective polarizer disposed on a major surface of the first lens, and an optical stack disposed on a major surface of the second lens. The optical stack includes an absorbing polarizer, a first retarder layer, a partial reflector, and a second retarder layer disposed between the absorbing polarizer and the partial reflector. The first and/or second lenses is/are birefringent lens provided outside the optical cavity to control polarization.

An electronic watchmaker magnifier, intended to observe a watchmaking product, in particular a watch mechanism, is provided with: a magnifying objective lens, to observe the watchmaking product, communication means, to receive data, a display screen, to display the data, a beam splitter, provided to simultaneously direct towards a user's eye at least one image of the watchmaking product coming from the magnifying objective lens and at least one image from the display screen.

A packing structure including a first packing component, a second packing component, and two lenses is provided. The second packing component is adapted to be combined with the first packing component detachably, such that a containing space is formed between the first packing component and the second packing component. The containing space is adapted to contain an electronic device. The two lenses are disposed on the second packing component. An image displayed by a display surface of the electronic device is adapted to be transmitted to outside of the containing space through the two lenses, so as to form a virtual reality image.

A desktop electronic magnifier in a first embodiment includes a monitor and a control panel mounted to the monitor so that access to the control panel cannot be blocked by any position of the monitor. In a second embodiment, a monitor is positioned atop a flat platform that surmounts the camera so that access to the control panel cannot be blocked by any position of the monitor. In a third embodiment, the control panel is mounted to the camera and the monitor is supported by a support surface independent of the magnifier. Access to the control panel is blocked only if the user positions the monitor in blocking relation to the control panel.

A portable folding virtual reality device having a cover formed horizontally; a mounting case which is provided on a front of the cover and on which an image device such as a smart phone is mounted; a lens plate provided with a magnifying lens at a rear of the cover; and a band which is connected to both ends of the lens plate and through which the device is mounted to a head of a user. The mounting case and the lens plate are arranged to form up and downward at a right angle and to rotate by the cover and a front and rear hinges. A supporting plate that rotates left and rightward with respect to a central line of the cover is provided, and the interval between the front hinge and the rear hinge is identical to the focal distance of the left and right magnifying lens.

A magnifying device for a mobile device is a case, for inserting a cellular phone into, that has a see-through front cover with a magnifying screen for enlarging the print on the screen of the cellular phone. A pocket on the back cover holds a thin magnifier for using to enlarge the minute print often used in cellular phone menus.