An optical path control apparatus includes an oscillating part including an optical member on which light is made incident; an actuator configured to oscillate the oscillating part; and a drive unit configured to apply to the actuator a drive signal with a waveform including a first period in which a current value is changed from a first current value to a second current value and including a second period that is continuous with the first period and in which the current value is held at the second current value, to cause the actuator to oscillate the oscillating part and to control an optical path. The drive unit applies the drive signal so that the length of the first period is a value corresponding to the natural frequency of the oscillating part.

An optical path control apparatus includes an oscillating part including an optical member on which light is made incident; an actuator configured to oscillate the oscillating part; and a drive unit configured to apply to the actuator a drive signal with a waveform including a first period in which a current value is changed from a first current value to a second current value and including a second period that is continuous with the first period and in which the current value is held at the second current value, to cause the actuator to oscillate the oscillating part and to control an optical path. The drive unit applies the drive signal so that the length of the first period is a value corresponding to the natural frequency of the oscillating part.

The present disclosure discloses a projection lamp for projecting a nebula and a starry sky comprising a housing, a light source assembly, a laser assembly, a rotating assembly, a control board, a base seat, and a power source port. The light source assembly and the laser assembly are disposed in the housing and penetrate through the housing, and the rotating assembly and the control board are disposed in the housing. The rotating assembly is configured to drive a rotating optical sheet and a diffraction sheet to rotate. The light source assembly comprises a light source board, a light reflecting cup, a fixed optical sheet, the rotating optical sheet, and a lens assembly. The light source board, the light reflecting cup, the fixed optical sheet, the rotating optical sheet, and the lens assembly are successively disposed along a path in which light rays emitted by the light source board move.

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 0.7≤W1/W2≤2.

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 0.7≤W1/W2≤2.

The present disclosure discloses a projection lamp for projecting a nebula and a starry sky comprising a housing, a light source assembly, a laser assembly, a rotating assembly, a control board, a base seat, and a power source port. The light source assembly and the laser assembly are disposed in the housing and penetrate through the housing, and the rotating assembly and the control board are disposed in the housing. The rotating assembly is configured to drive a rotating optical sheet and a diffraction sheet to rotate. The light source assembly comprises a light source board, a light reflecting cup, a fixed optical sheet, the rotating optical sheet, and a lens assembly. The light source board, the light reflecting cup, the fixed optical sheet, the rotating optical sheet, and the lens assembly are successively disposed along a path in which light rays emitted by the light source board move.

The present disclosure discloses a projection lamp for projecting a nebula and a starry sky comprising a housing, a light source assembly, a laser assembly, a rotating assembly, a control board, a base seat, and a power source port. The light source assembly and the laser assembly are disposed in the housing and penetrate through the housing, and the rotating assembly and the control board are disposed in the housing. The rotating assembly is configured to drive a rotating optical sheet and a diffraction sheet to rotate. The light source assembly comprises a light source board, a light reflecting cup, a fixed optical sheet, the rotating optical sheet, and a lens assembly. The light source board, the light reflecting cup, the fixed optical sheet, the rotating optical sheet, and the lens assembly are successively disposed along a path in which light rays emitted by the light source board move.

A projection structure that occupies a small space and performs dynamic projection includes a first support, a lens assembly, a film portion, a light source, a motor, a control portion, and a second support, wherein the light source, the film portion, and the lens assembly form a projection light path, the film portion being driven by the motor to rotate. The lens assembly includes at least one lens, and the at least one lens is accommodated in the first support, the control portion being configured to control the motor and/or the light source. The second support is configured to support the first support, wherein the first support and second support are respectively configured to form a first space and a second space of the film portion.

A projection structure that occupies a small space and performs dynamic projection includes a first support, a lens assembly, a film portion, a light source, a motor, a control portion, and a second support, wherein the light source, the film portion, and the lens assembly form a projection light path, the film portion being driven by the motor to rotate. The lens assembly includes at least one lens, and the at least one lens is accommodated in the first support, the control portion being configured to control the motor and/or the light source. The second support is configured to support the first support, wherein the first support and second support are respectively configured to form a first space and a second space of the film portion.

A projection structure that occupies a small space and performs dynamic projection includes a first support, a lens assembly, a film portion, a light source, a motor, a control portion, and a second support, wherein the light source, the film portion, and the lens assembly form a projection light path, the film portion being driven by the motor to rotate. The lens assembly includes at least one lens, and the at least one lens is accommodated in the first support, the control portion being configured to control the motor and/or the light source. The second support is configured to support the first support, wherein the first support and second support are respectively configured to form a first space and a second space of the film portion.