A projection device according to an aspect of the present invention is a projection device for use at a construction site, and includes: a projector that projects an image onto a projection plane; a distance meter that measures a distance to the projection plane; a rotation driver that rotates the projector and the distance meter; an angle sensor that measures a rotation angle of the rotation driver; and a data processor that corrects the image that is projected from the projector. At least one of the distance meter or the projector is offset from a center line of a rotation axis of the rotation driver. The data processor corrects the image by using the distance measured by the distance meter and the rotation angle measured by the angle sensor.

An optical module and a projection apparatus using the optical module are provided. The optical module includes a base, a first frame, an optical element and at least one driving assembly. The first frame is disposed in the base. The optical element is disposed in the first frame. The at least one driving assembly is disposed between the base and the first frame. The first frame is configured to move relative to the base by a magnetic force generated by the at least one driving assembly. Each of the at least one driving assembly includes a coil and a Halbach array magnet structure, the coil and the Halbach array magnet structure face each other along a first direction, a width of the Halbach array magnet structure in the first direction is W1, and a width of the coil in the first direction is W2, and 0.7W1/W22.

An optical module and a projection apparatus using the optical module are provided. The optical module includes a base, a first frame, an optical element and at least one driving assembly. The first frame is disposed in the base. The optical element is disposed in the first frame. The at least one driving assembly is disposed between the base and the first frame. The first frame is configured to move relative to the base by a magnetic force generated by the at least one driving assembly. Each of the at least one driving assembly includes a coil and a Halbach array magnet structure, the coil and the Halbach array magnet structure face each other along a first direction, a width of the Halbach array magnet structure in the first direction is W1, and a width of the coil in the first direction is W2, and 0.7W1/W22.

A multi-lens camera module comprises at least two lens modules located side-by-side. Each lens module can be a voice coil motor (VCM) lens module having an auto-focusing (AF) or/and an optical image stabilizer (OIS) functions. The surface where two lens modules are adjacent with is called the neighbouring surface. A projection view on the neighbouring surface of a plurality of secondary driving magnets of these lens modules located at two sides of the neighbouring surface includes at least one secondary driving magnet which has two opposite edges with unequal length; in addition, shapes of these two opposite edges include at least one of the following: slope, arc and straight line. These secondary driving magnets are arranged across the neighbouring surface in a staggered manner.

A multi-lens camera module comprises at least two lens modules located side-by-side. Each lens module can be a voice coil motor (VCM) lens module having an auto-focusing (AF) or/and an optical image stabilizer (OIS) functions. The surface where two lens modules are adjacent with is called the neighbouring surface. A projection view on the neighbouring surface of a plurality of secondary driving magnets of these lens modules located at two sides of the neighbouring surface includes at least one secondary driving magnet which has two opposite edges with unequal length; in addition, shapes of these two opposite edges include at least one of the following: slope, arc and straight line. These secondary driving magnets are arranged across the neighbouring surface in a staggered manner.

A lid controlling apparatus includes a casing having a target region, a lid, and a rod driving mechanism connected between the casing and the lid. The rod driving mechanism includes a first rod pivoted to the casing, a non-rotatable gear fixed to the casing, a driven gear pivoted to a side of the first rod and connected to the lid, and a planetary gear device pivoted to the side of the first rod and engaged with the non-rotatable gear and the driven gear for rotating between lifting and closed positions. When the planetary gear device rotates to the lifting position, the first rod pivots with rotation of the planetary gear device to have a first included angle relative to the casing, and the planetary gear device rotates the driven gear to make the lid have a second included angle relative to the first rod for exposing the target region.

A lid controlling apparatus includes a casing having a target region, a lid, and a rod driving mechanism connected between the casing and the lid. The rod driving mechanism includes a first rod pivoted to the casing, a non-rotatable gear fixed to the casing, a driven gear pivoted to a side of the first rod and connected to the lid, and a planetary gear device pivoted to the side of the first rod and engaged with the non-rotatable gear and the driven gear for rotating between lifting and closed positions. When the planetary gear device rotates to the lifting position, the first rod pivots with rotation of the planetary gear device to have a first included angle relative to the casing, and the planetary gear device rotates the driven gear to make the lid have a second included angle relative to the first rod for exposing the target region.

Movement of a movable portion without stopping at any moment can be achieved by a simple configuration including a beam structural portion including two beam portions extending in directions different from each other and one driving portion. Furthermore, a size reduction of a device is achieved in comparison with a case where a device includes a motor disposed for rotation driving.

Movement of a movable portion without stopping at any moment can be achieved by a simple configuration including a beam structural portion including two beam portions extending in directions different from each other and one driving portion. Furthermore, a size reduction of a device is achieved in comparison with a case where a device includes a motor disposed for rotation driving.

A multi-lens camera module comprises at least two lens modules located side-by-side. Each lens module can be a voice coil motor (VCM) lens module having an auto-focusing (AF) or/and an optical image stabilizer (OIS) functions. The surface where two lens modules are adjacent with is called the neighbouring surface. A projection view on the neighbouring surface of a plurality of secondary driving magnets of these lens modules located at two sides of the neighbouring surface includes at least one secondary driving magnet which has two opposite edges with unequal length; in addition, shapes of these two opposite edges include at least one of the following: slope, arc and straight line. These secondary driving magnets are arranged across the neighbouring surface in a staggered manner.