Head-mounted display apparatus with autofocus system

Head-mounted display apparatus with autofocus system for focusing an object of interest, said object of interest being an optical, machine-readable data representation said apparatus comprising:

• a. a first image sensor adapted for capturing images, said first image sensor comprising a lens assembly with variable diopter aligned to the first image sensor;
• b. a light beam emitter for generating a light beam for marking an object of interest, thereby indicating to a user the object of interest being captured by the first image sensor, wherein the light beam emitter is mounted on the apparatus oriented with respect to the lens assembly of the first image sensor so as to emit the light beam within the field of view of the first image sensor;
• c. a temperature robust, one-piece mechanical assembly fixing said light beam emitter under a constant, predetermined angle to said lens assembly of said first image sensor, wherein said temperature robust mechanical assembly comprises a material with a linear thermal expansion coefficient (a) of at most 250 10-5 per Kelvin;
• d. a processor module configured for triangulating a distance from the apparatus to the object of interest requiring focus, based on images captured by said first image sensor of the head-mounted display apparatus;
• e. a driver module adapted for focusing the lens assembly of the first image sensor based on said triangulated distance;
• wherein the light beam emitter has a marking mode and a ranging mode, wherein the light beam emitter operates in the marking mode in absence of detection of predetermined triggers, wherein the light beam emitter in the marking mode generates an optically visible marker detectable by the human eye on the object of interest, and wherein the light beam emitter is configured for entering the ranging mode upon detection of a predetermined trigger, wherein the ranging mode comprises the light beam emitter to emit at least one, and optionally two or more subsequent, light pulses thereby creating at least one, and optionally two or more subsequent, pulsed light spot on the object of interest, wherein at least one or more of said images of the first image sensor used for triangulating the distance comprises the light spot from the light beam, wherein the processor module is adapted for determining coordinates of said light spot based on the one or more images of the first image sensor, and wherein the triangulation of the distance is furthermore based on said coordinates of the light spot;
• wherein the central axes of the light beam emitter and the lens assembly of the first image sensor are distanced at least 0.10 cm from each other.