Abstract: An imaging device of reduced size includes a housing, a sensor, a filter, and a metalens. The housing defines a receiving cavity and a through hole connected to the receiving cavity. The sensor, the filter, and the metalens are disposed in the receiving cavity. The sensor is used to receive far-infrared light of the incoming light and form an image according to the far-infrared light. The filter is used to allow the far-infrared light of the incoming light to pass through. The metalens includes a substrate and a metasurface structure. The substrate is between the through hole and the filter. The metasurface structure is connected to the substrate. The far-infrared light is used to refract the far-infrared light, thereby causing the far-infrared light to focus on the sensor after passing through the filter.

Abstract: A lens module includes a plurality of lenses arranged in sequence from an object side to an image side along an optical axis. At least one lens of the plurality of lenses is a freeform lens. An object-side surface and/or an image-side surface of the freeform lens is a freeform surface. An X-axis and a Y-axis are defined as two central axes perpendicular to each other on an image surface of the lens module.

Abstract: A camera module includes a positioning plate, a positioning frame, a spring member, a lens holder, and a piezoelectric actuator. The positioning frame is fixed to the positioning plate and defines a positioning through hole. The spring member is disposed on the positioning plate and in a compressed state. The lens holder is received in the positioning through hole and movably engaged with the positioning frame. The piezoelectric actuator is sandwiched between the compressed spring member and the lens holder. The piezoelectric actuator is operable to drive the lens holder to rotate about a central axis of the positioning frame, thereby move along the central axis relative to the positioning frame.

Abstract: An exemplary camera module includes a lens holder and a lens barrel. The lens holder includes a cylindrical receiving cavity defined therein and an inner smooth surface in the cylindrical receiving cavity. The lens barrel is received in the cylindrical receiving cavity. The lens barrel includes a hollow cylinder and a plurality of spaced protrusions arranged on the outer cylindrical surface of the hollow cylinder. The outer cylindrical surface is spaced from the inner smooth surface. The protrusions abut against the inner smooth surface.

Abstract: An image capturing device includes a housing, a camera module, polarizer, and a cover. The housing defines a through hole. The camera module is received in the housing and aligned with the through hole. The cover defines an opening. The polarizer is connected to the cover. The cover is detachably engaged with the housing. The camera module, the through hole, the polarizer, the opening aligned with each other.

Abstract: A lens arrangement includes two lenses. Each lens includes an optical portion having an optical axis, a non-optical portion surrounding the optical portion, and an engagement portion extending along and inclining relative to the optical axis from the non-optical portion. The engagement portions of the lenses are engaged with each other and an included angle is defined between the engagement portions. One of the lenses includes an elastic element which can be flexibly deformed relative to the other lens.

Abstract: An optical touch device includes a touch panel, an infrared light pen, and an infrared camera module. The infrared light pen emits infrared light towards a surface of the touch panel. The touch panel includes a display panel and an infrared reflective element. The infrared reflective element is stacked on the display panel and faces the infrared camera module. The infrared reflective element reflects the infrared light to the camera module. The camera module captures images of the infrared light reflected by the infrared reflective element.

Abstract: An exemplary digital picture frame includes a frame body, a supporting portion, a carrying portion, an image capturing unit and light sources. The frame body includes a rear surface. The supporting portion extends from the rear surface and is configured for supporting the digital picture frame on a supporting surface. The carrying portion is arranged at the rear surface. The carrying portion includes a mount for facing the supporting surface. The mount is configured for holding a printed picture thereon. The image capturing unit is arranged at the supporting portion and is configured for capturing an image of the printed picture. The light sources are arranged at the supporting portion and are configured for illuminating the printed picture.

Abstract: A camera device includes a camera module, a driving member, and a mirror. The camera module has an optical axis associated therewith. The driving member has a driving shaft. The mirror is coupled to the driving shaft. The driving member is configured for driving the mirror to rotate around the driving shaft. The mirror is obliquely oriented relative to the optical axis. The camera module is configured for capturing images formed in the mirror.

Abstract: An image capturing device includes a housing, a camera module, polarizer, and a cover. The housing defines a through hole. The camera module is received in the housing and aligned with the through hole. The cover defines an opening. The polarizer is connected to the cover. The cover is detachably engaged with the housing. The camera module, the through hole, the polarizer, the opening aligned with each other.

Abstract: A camera includes a lens module, an image sensor, and a shutter module. The centers of the image sensor and the shutter module are on an optical axis of the lens module. The shutter module includes a frame and an electroactive telescopic unit having a first electroactive polymer layer, two compliant electrode layers, and two second electroactive polymer layers. The center of the electroactive telescopic unit has a through hole through the first electroactive polymer layer, the two compliant electrode layers, and the two second electroactive polymer layers. A central axis of the through hole and the optic axis of the lens module are coaxial. The electroactive telescopic unit is contractible or expandable along a direction perpendicularly to the optic axis of the lens module in response to a change in a voltage applied between the two compliant electrode layers.

Abstract: A lens arrangement includes two lenses. Each lens includes an optical portion having an optical axis, a non-optical portion surrounding the optical portion, and an engagement portion extending along the optical axis from the non-optical portion. One of the engagement portions includes an outer wall and an inner wall parallel to the outer wall with an annular groove defined therebetween, while the other engagement portion defines a corresponding annular space for receiving the outer wall and the inner wall therein, therefore the engagement portions are interferentially engaged with each other.

Abstract: A lens arrangement includes two lenses. Each lens includes an optical portion having an optical axis, a non-optical portion surrounding the optical portion, and an engagement portion extending along and inclining relative to the optical axis from the non-optical portion. The engagement portions of the lenses are engaged with each other and an included angle is defined between the engagement portions. One of the lenses includes an elastic element which can be flexibly deformed relative to the other lens.

Abstract: A lens arrangement includes two lenses. Each lens includes an optical portion having an optical axis, a non-optical portion surrounding the optical portion, and an engagement portion extending along the optical axis from the non-optical portion. One of the engagement portions includes an outer wall and an inner wall parallel to the outer wall with an annular groove defined therebetween, while the other engagement portion defines a corresponding annular space for receiving the outer wall and the inner wall therein, therefore the engagement portions are interferentially engaged with each other.

Abstract: A camera includes a lens module, an image sensor, and a shutter module. The centers of the image sensor and the shutter module are on an optical axis of the lens module. The shutter module includes a frame and an electroactive telescopic unit having a first electroactive polymer layer, two compliant electrode layers, and two second electroactive polymer layers. The center of the electroactive telescopic unit has a through hole through the first electroactive polymer layer, the two compliant electrode layers, and the two second electroactive polymer layers. A central axis of the through hole and the optic axis of the lens module are coaxial. The electroactive telescopic unit is contractible or expandable along a direction perpendicularly to the optic axis of the lens module in response to a change in a voltage applied between the two compliant electrode layers.

Abstract: An exemplary camera module includes a lens holder and a lens barrel. The lens holder includes a cylindrical receiving cavity defined therein and an inner smooth surface in the cylindrical receiving cavity. The lens barrel is received in the cylindrical receiving cavity. The lens barrel includes a hollow cylinder and a plurality of spaced protrusions arranged on the outer cylindrical surface of the hollow cylinder. The outer cylindrical surface is spaced from the inner smooth surface. The protrusions abut against the inner smooth surface.

Abstract: A camera module includes a positioning plate, a positioning frame, a spring member, a lens holder, and a piezoelectric actuator. The positioning frame is fixed to the positioning plate and defines a positioning through hole. The spring member is disposed on the positioning plate and in a compressed state. The lens holder is received in the positioning through hole and movably engaged with the positioning frame. The piezoelectric actuator is sandwiched between the compressed spring member and the lens holder. The piezoelectric actuator is operable to drive the lens holder to rotate about a central axis of the positioning frame, thereby move along the central axis relative to the positioning frame.

Abstract: An exemplary digital picture frame includes a frame body, a supporting portion, a carrying portion, an image capturing unit and light sources. The frame body includes a rear surface. The supporting portion extends from the rear surface and is configured for supporting the digital picture frame on a supporting surface. The carrying portion is arranged at the rear surface. The carrying portion includes a mount for facing the supporting surface. The mount is configured for holding a printed picture thereon. The image capturing unit is arranged at the supporting portion and is configured for capturing an image of the printed picture. The light sources are arranged at the supporting portion and are configured for illuminating the printed picture.

Abstract: An exemplary portable transmissive type projector includes a light source module configured for emitting light beams, a projection lens module, and a transmission type liquid crystal panel. The liquid crystal panel is disposed between the light source module and the projection lens module and configured for displaying images. The projection lens module is configured for projecting the displayed images illuminated by the light beams onto an external object for viewing.

Abstract: An optical system for a projector is provided, including a light source generating laser beams, a transforming sheet, a panel, and a lens set. Laser beams from planar light sources penetrate the transforming sheet and are uniformly transformed to be rectangular beams, acting as light beams from a planar light source. The rectangular laser beams pass through the panel to generate an image which is projected to a screen by the lens set.