An aperture unit having an optical axis is provided, which includes a fixed portion having a first surface and including a protrusion formed on the first surface, a guiding element movably connected to the fixed portion and including a through hole, a first blade movably connected to the guiding element and the fixed portion, and a driving assembly use for driving the guiding element to move for moving the first blade. The optical axis passes through the through hole. The first surface has a first accommodating space having a recessed structure to accommodate the guiding element, and the protrusion extends toward the first blade.

An aperture unit having an optical axis is provided, which includes a fixed portion comprising a sidewall, a guiding element movably connected to the fixed portion, a first blade movably connected to the guiding element and the fixed portion, and a sliding element. The sidewall has a recessed portion having a recessed structure. The sliding element is at least partially accommodated in the recessed portion, and the guiding element is movable relative to the fixed portion through the sliding element.

An aperture unit having an optical axis is provided, which includes a fixed portion, a guiding element movably connected to the fixed portion, a first blade movably connected to the guiding element and the fixed portion, a driving assembly used for driving the guiding element to move for moving the first blade, a circuit assembly electrically connected to the driving assembly, and a bottom plate disposed on the circuit assembly and including metal.

An aperture unit having an optical axis is provided, which includes a fixed portion having a positioning recess, a guiding element movably connected to the fixed portion and accommodated in the first accommodating space, a first blade movably connected to the guiding element and the fixed portion, and a driving assembly used for driving the guiding element to move for moving the first blade. The positioning recess corresponds to the guiding element and is used for limiting a movable range of the guiding element.

An aperture unit having an optical axis is provided, which includes a fixed portion having a first surface and an opening, a guiding element movably connected to the fixed portion and accommodated in the first accommodating space, a first blade movably connected to the guiding element and the fixed portion, and a driving assembly used for driving the guiding element to move for moving the first blade. A first accommodating space having a recessed structure is formed on the first surface. The opening is formed in the first accommodating space and has a recessed structure. The driving assembly is at least partially disposed in the opening.

An optical system is provided, which includes a holder used for connecting an aperture unit, a bottom, a second driving assembly used for driving the holder to move, an upper spring disposed on the holder, and an aperture unit disposed on the holder and comprising a third driving assembly used for controlling a size of an aperture opening. The holder is movable relative to the bottom. The third driving assembly is electrically connected to the upper spring.

A driving mechanism for supporting an optical member is provided, including a fixed module, a movable module, a driving module disposed therebetween, and an elastic member. The driving module can drive the movable module to rotate around a first rotation axis relative to the fixed module. The elastic member includes a first connecting portion connected to the movable module, a second connecting portion connected to the fixed module, a first string portion connected to the first connecting portion, and a first buffer portion connected to the first string portion. The first string portion is disposed on the first rotation axis. The longitudinal axis of the first string portion is parallel to the first rotation axis. The first buffer portion has wave-shaped structure.

A beam steering device includes a housing and a transceiver that emits and receives light beams through at least one opening in the housing. A rotator includes a cylindrical body rotatably mounted within the housing axially between the transceiver and the at least one opening. A wedge-shaped prism is secured within the body and includes a first surface extending perpendicular to the axis and a second surface extending transverse to the axis. An encoder member and a drive member are provided on an outer surface of the body. Sensors are mounted to the housing to sense the encoder member and provide an encoder signal indicative of a rotational position of the prism about the axis. At least one drive element is mounted to the housing and applies force to the drive member to rotate the body and prism about the axis for steering light beams propagating through the prism.

A 3D projector for mobile phone, comprising an inverted-L shaped frame, a signal receiver disposed inside the inverted-L shaped frame for receiving a mobile phone application program, a main pyramidal prism disposed directly on top of a display of the mobile phone, and an auxiliary pyramidal prism disposed directly on top of a front camera of the mobile phone. With the 3D projector for mobile phone as described, when such 3D projector is used, signal can be received through the inverted-L shaped frame, achieving upwards or downwards movement or rotation of the main pyramidal prism. Projection is achieved through the main pyramidal prism, thereby allowing viewers to watch 3D movies using mobile phones, and can also adjust 3D effects through making simple gestures according to the plot or viewer desire. This meets and satisfies the need for technology and experience of entertainment for the young people today.

An image projection unit includes: a light source unit; a plurality of reflection-type image display elements; a plurality of total reflection prisms configured to guide lights of multiple colors emitted from the light source unit to the reflection-type image display elements and to emit the lights reflected from the reflection-type image display elements; a color synthesis prism configured to receive the lights emitted from the total reflection prisms, synthesize the lights, and emit the synthesized lights; a holding member fixed to the color synthesis prism and holding the reflection-type image display elements; and a base member supporting the color synthesis prism and the plurality of total reflection prisms