An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

A head-mounted device (HMD) is structured to include at least one computer vision camera that omits an IR light filter. Consequently, this computer vision's sensor is able to detect IR light, including IR laser light, in the environment. The HMD is configured to generate an image of the environment using the computer vision camera. This image is then fed as input into a machine learning (ML) algorithm that identifies IR laser light, which is detected by the sensor and which is recorded in the image. The HMD then visually displays a notification comprising information corresponding to the detected IR laser light.

A method for controlling a laser pointer projection of a pet companion robot device to interact with a pet includes the steps of: determining a focal length 1 of the camera; determining a height difference Δy between the at least one laser pointer steering motors of the laser pointer and the camera; determining a horizontal viewing angle α of the camera, a corresponding horizontal viewing range is (-α/2, α/2); determining a vertical viewing angle β of the camera, a corresponding vertical viewing range is (-β/2, β/2); determining whether the touch screen of the wireless remote-control device is touched; when the touch screen of the wireless remote-control device is touched, determining the corresponding coordinates (i, j); calculating an angular difference Δθ between the camera and the at least one laser pointer steering motors: ; calculating a horizontal steering motor rotation angle θ.sub.x; calculating a vertical steering motor rotation angle θ.sub.y.

A method for controlling a laser pointer projection of a pet companion robot device to interact with a pet includes the steps of: determining a focal length 1 of the camera; determining a height difference Δy between the at least one laser pointer steering motors of the laser pointer and the camera; determining a horizontal viewing angle α of the camera, a corresponding horizontal viewing range is (-α/2, α/2); determining a vertical viewing angle β of the camera, a corresponding vertical viewing range is (-β/2, β/2); determining whether the touch screen of the wireless remote-control device is touched; when the touch screen of the wireless remote-control device is touched, determining the corresponding coordinates (i, j); calculating an angular difference Δθ between the camera and the at least one laser pointer steering motors: ; calculating a horizontal steering motor rotation angle θ.sub.x; calculating a vertical steering motor rotation angle θ.sub.y.

An adjustable laser sight is described to be utilized with a firearm and a select ammunition having a known trajectory. The sight has an outer housing and a movable laser diode. The sight also includes a vertical adjuster for varying the vertical angle of the diode. The vertical adjuster has a turret with a series of detent holes therein which mesh with a spring biased detent. The turret detent holes are unevenly spaced from each other, with the spacing increasing between each successive pair of turret detent holes. Each turret detent hole is associated with a progressively increasing incremental target distance mark on the turret. A first bushing is rotatably coupled to the turret and is rotatably coupled to a second bushing with camming members. The second bushing also has an internally threaded adjustment screw therein for even adjustment of the laser diode.

An adjustable laser sight is described to be utilized with a firearm and a select ammunition having a known trajectory. The sight has an outer housing and a movable laser diode. The sight also includes a vertical adjuster for varying the vertical angle of the diode. The vertical adjuster has a turret with a series of detent holes therein which mesh with a spring biased detent. The turret detent holes are unevenly spaced from each other, with the spacing increasing between each successive pair of turret detent holes. Each turret detent hole is associated with a progressively increasing incremental target distance mark on the turret. A first bushing is rotatably coupled to the turret and is rotatably coupled to a second bushing with camming members. The second bushing also has an internally threaded adjustment screw therein for even adjustment of the laser diode.

A pointer includes a case housing an LED device and including a light emission hole through which light from the device is emitted to an external space, a first plate between the device and the light emission hole and including a first light passage hole that allows passage of the light from the device, and a second plate between the first plate and the light emission hole and including a second light passage hole that allows passage of the light having passed through the first light passage hole. The light passage holes and the light emission hole are located on a central axis of the device. The device and the first and second plates are disposed such that H/2<S<H, where H denotes a distance between the device and the first plate, and S denotes a distance between the first and second plates.

A pointer includes a case housing an LED device and including a light emission hole through which light from the device is emitted to an external space, a first plate between the device and the light emission hole and including a first light passage hole that allows passage of the light from the device, and a second plate between the first plate and the light emission hole and including a second light passage hole that allows passage of the light having passed through the first light passage hole. The light passage holes and the light emission hole are located on a central axis of the device. The device and the first and second plates are disposed such that H/2<S<H, where H denotes a distance between the device and the first plate, and S denotes a distance between the first and second plates.

A laser mount for fixedly coupling a laser pointer includes: a first layer; a second layer including a first end and a second end, a connection between the first layer and the first end forming a spring-tensioned hinge, such that deflection of the second end about the connection imparts a spring tension to the second layer, and the second end being spaced apart from the first layer; a first adjustment screw configured to vertically couple the first layer and the second end and to adjust a vertical spring tension between the first layer and the second layer; and a second adjustment screw configured to horizontally couple the first layer and the second end and to adjust a horizontal spring tension between the first layer and the second layer.

A laser mount for fixedly coupling a laser pointer includes: a first layer; a second layer including a first end and a second end, a connection between the first layer and the first end forming a spring-tensioned hinge, such that deflection of the second end about the connection imparts a spring tension to the second layer, and the second end being spaced apart from the first layer; a first adjustment screw configured to vertically couple the first layer and the second end and to adjust a vertical spring tension between the first layer and the second layer; and a second adjustment screw configured to horizontally couple the first layer and the second end and to adjust a horizontal spring tension between the first layer and the second layer.