A beam shading device capable of accurately positioning includes a substrate, a plurality of shading blades mounted on the substrate, and driving mechanisms for driving the shading blades to move. The substrate is provided with a first light-passing hole through which beams pass, the plurality of shading blades are arranged around the periphery of the first light-passing hole, and the driving mechanisms drive the shading blades to move back and forth between blocking and opening the first light-passing hole. Each shading blade is configured with at least two driving mechanisms, and each driving mechanism includes a driving gear and a driving plate. The driving plate is hinged with the shading blade, and the driving plate is provided with a rack that meshes with the driving gear.

A beam shading device capable of accurately positioning includes a substrate, a plurality of shading blades mounted on the substrate, and driving mechanisms for driving the shading blades to move. The substrate is provided with a first light-passing hole through which beams pass, the plurality of shading blades are arranged around the periphery of the first light-passing hole, and the driving mechanisms drive the shading blades to move back and forth between blocking and opening the first light-passing hole. Each shading blade is configured with at least two driving mechanisms, and each driving mechanism includes a driving gear and a driving plate. The driving plate is hinged with the shading blade, and the driving plate is provided with a rack that meshes with the driving gear.

An illumination device according to the present disclosure includes: an illumination optical system that includes a first variable diaphragm and a second variable diaphragm, and that generates illumination light used for generation of an image by a pulse width modulation method on the basis of light from the light source; a luminance calculating section that calculates average luminance at least for each frame in an image signal; a gray-scale evaluation computing section that evaluates a gray-scale value in a screen for each display period of at least a unit gray-scale bit; a first aperture diameter determining section that determines an aperture diameter of the first variable diaphragm on the basis of the average luminance calculated by the luminance calculating section; and a second aperture diameter determining section that determines an aperture diameter of the second variable diaphragm on the basis of evaluation by the gray-scale evaluation computing section.

A firearm light accessory with one or more embodiments enabling its user to control brightness of the colored beam or white beam of the firearm light. It comprises three items: a see-through lens cover with its base (18) attached to its cap (10) by a spring-assisted hinge, iris (12), and transparent colored disk (20). The cap is closed for the colored beam and opened for the white beam. Iris adjusting lever (14) protrudes through lens cover base (18). The lever position determines the amount of light passing through the accessory, so as to control brightness. The accessory can be produced with minimal equipment and materials by a person having ordinary skill in the art. Costs of production compared to the prices of colored filter devices not having brightness-control ability indicate commercial feasibility. Benefits include reducing glare, preserving the user's night vision, and reducing the user's risk of detection, thereby to assist hunters and to protect persons in combat or similar danger.

A firearm light accessory with one or more embodiments enabling its user to control brightness of the colored beam or white beam of the firearm light. It comprises three items: a see-through lens cover with its base (18) attached to its cap (10) by a spring-assisted hinge, iris (12), and transparent colored disk (20). The cap is closed for the colored beam and opened for the white beam. Iris adjusting lever (14) protrudes through lens cover base (18). The lever position determines the amount of light passing through the accessory, so as to control brightness. The accessory can be produced with minimal equipment and materials by a person having ordinary skill in the art. Costs of production compared to the prices of colored filter devices not having brightness-control ability indicate commercial feasibility. Benefits include reducing glare, preserving the user's night vision, and reducing the user's risk of detection, thereby to assist hunters and to protect persons in combat or similar danger.

A light amount adjustment device includes a base member, a rotation member rotatably held with respect to the base member, and a light amount adjustment member engaged with the rotation member and configured to be driven by the rotation member to adjust an amount of passing light. The rotation member includes a first surface area in contact with the base member and a second surface area not in contact with the base member. A surface roughness of the first surface area is greater than a surface roughness of the second surface area.

A light amount adjustment device includes a base member, a rotation member rotatably held with respect to the base member, and a light amount adjustment member engaged with the rotation member and configured to be driven by the rotation member to adjust an amount of passing light. The rotation member includes a first surface area in contact with the base member and a second surface area not in contact with the base member. A surface roughness of the first surface area is greater than a surface roughness of the second surface area.

A plaster frame is provided for recessed lighting luminaires, wherein the main hole size is not fixed, but adjustable, and in more than one shape opening, e.g. round, square, rectangular, and other opening shapes as required. The plaster frame has an adjustable hole, the concept here disclosed comprises a series of moving leaves and may also contain an actuating ring, the rotation of which cause the leaves to move inward or outward, changing the hole, or aperture. Although fasteners may be used to retain the various moving elements, these adjustable openings can also be utilized without the use of any fasteners.

A plaster frame is provided for recessed lighting luminaires, wherein the main hole size is not fixed, but adjustable, and in more than one shape opening, e.g. round, square, rectangular, and other opening shapes as required. The plaster frame has an adjustable hole, the concept here disclosed comprises a series of moving leaves and may also contain an actuating ring, the rotation of which cause the leaves to move inward or outward, changing the hole, or aperture. Although fasteners may be used to retain the various moving elements, these adjustable openings can also be utilized without the use of any fasteners.

A head-mountable light includes a user-adjustable spot size. Light from an LED travels through beam-forming optical elements supported at the front opening of a housing to form a spot of light at a working distance. An adjustable iris, situated between the LED and the beam forming optical elements, enables a user to adjust the iris and vary the size of the aperture and the spot size of the light at the working distance. The manually operated iris size control may comprise a rotatable ring on the exterior of the housing, and the plurality of beam-forming optical elements may comprise a singlet lens followed by a doublet lens. The light from the LED strikes the beam-dispersing element directly without an intervening condensing optical element (i.e., condensing lens). The assembly further includes a mechanical connector adapted to couple the housing to a pair of eyeglass frames, headband or other head-worn structure.