An optical projection device, which effectively suppresses variation in aberration due to irregularities in installation positions of lens groups which form an optical projection system, and a projector which includes the optical projection device are provided. In a lens group, which includes a diaphragm, in an optical projection device which includes a plurality of lens groups, a lens frame is divided between the diaphragm and a lens which is adjacent to the diaphragm, one lens frame which is acquired through the division includes an adjustment portion, which maintains a position of an optical axis to be adjusted, with respect to the other lens frame which is acquired through the division.

A method for attaching camera filters and other light transmissive elements using flexural rigidity. A flexion arm enables coupling with cameras and other devices in areas non-proximate to a lens. A frame conjoined with the flexion arm enables attachment of the camera filter to a camera lens or lens housing.

A VCM is disclosed, the VCM including a rotor including a bobbin arranged at an upper surface of a base formed with an opening, and a driving coil wound on the bobbin, a stator including a driving magnet opposite to the driving coil, and a yoke secured by the driving magnet at an inner surface of a lateral plate, and a tilting unit including a tilt magnet arranged at an outer surface of the lateral plate, a housing fixing the tilt magnet, and a tilt coil unit opposite to the tilt magnet.

Lens barrel according to the present exemplary embodiment is provided with lens unit, stationary frame, focus ring, focus grip, and a fixing section. Lens unit has an optical system. Stationary frame supports lens unit to be movable in a direction of optical axis X of the optical system. Focus ring is disposed on an outer circumferential side of lens unit, and is rotated when focus adjustment is manually performed. Focus grip is provided to protrude outwardly from focus ring, and operated for rotating focus ring. The fixing section fixes focus ring to stationary frame when focus adjustment is automatically performed. The fixing section has fixing button which is disposed on focus grip and operated for fixing focus ring to stationary frame.

There is provided an image pickup unit which is capable of achieving a focused image of a favorable depth of field while changing a visual field direction of observation.

An image pickup unit, comprises a front group which includes a prism that can be rotated for changing a visual field direction, and a rear group which includes a lens group and an image pickup element, wherein the image pickup unit includes a prism rotating section which rotates the prism for changing the visual field direction, and a focusing section which does not change a focused range, as an angle of visual field direction with respect to a longitudinal direction of the image pickup unit becomes smaller than a specific angle, and which moves the focused range toward a near-point side, as an angle of visual field direction with respect to the longitudinal direction of the image pickup unit becomes larger than the specific angle, in accordance with a rotation of the prism, and the focusing section, in a case in which the specific angle is not smaller than 30°, moves the focused range toward the near-point side.

There is provided an image pickup unit which is capable of achieving a focused image of a favorable depth of field while changing a visual field direction of observation.

An image pickup unit, comprises a front group which includes a prism that can be rotated for changing a visual field direction, and a rear group which includes a lens group and an image pickup element, wherein the image pickup unit includes a prism rotating section which rotates the prism for changing the visual field direction, and a focusing section which does not change a focused range, as an angle of visual field direction with respect to a longitudinal direction of the image pickup unit becomes smaller than a specific angle, and which moves the focused range toward a near-point side, as an angle of visual field direction with respect to the longitudinal direction of the image pickup unit becomes larger than the specific angle, in accordance with a rotation of the prism, and the focusing section, in a case in which the specific angle is not smaller than 30°, moves the focused range toward the near-point side.

Provided are a light-receiving device and lidar comprising the light-receiving device. The light-receiving device comprises: a first lens comprising a first lens surface for receiving light from an outside and a second lens surface for changing the path of the light received by the first lens surface and outputting the light to the outside; and a sensor on which light transmitted through the second lens surface is incident, wherein the first lens surface is a spherical surface, the second lens surface is an aspherical surface, and the focus of the first lens deviates from the sensor surface of the sensor.

Provided are a light-receiving device and lidar comprising the light-receiving device. The light-receiving device comprises: a first lens comprising a first lens surface for receiving light from an outside and a second lens surface for changing the path of the light received by the first lens surface and outputting the light to the outside; and a sensor on which light transmitted through the second lens surface is incident, wherein the first lens surface is a spherical surface, the second lens surface is an aspherical surface, and the focus of the first lens deviates from the sensor surface of the sensor.

An objective optical system for an endoscope consists of a front group, an aperture stop, and a positive rear group in order from an object side. The front group consists of a negative first lens having a smaller absolute value of a curvature radius of a lens surface on an image side than that on an object side, and one or more parallel planar members of which an incidence surface and an emission surface are perpendicular to an optical axis, in order from the object side. The rear group consists of a positive second lens and a cemented lens in which a negative third lens, and a positive fourth lens are joined together in order from the object side and a cemented surface has a concave surface toward the image side. A predetermined conditional expression is satisfied.

An objective optical system for an endoscope consists of a front group, an aperture stop, and a positive rear group in order from an object side. The front group consists of a negative first lens having a smaller absolute value of a curvature radius of a lens surface on an image side than that on an object side, and one or more parallel planar members of which an incidence surface and an emission surface are perpendicular to an optical axis, in order from the object side. The rear group consists of a positive second lens and a cemented lens in which a negative third lens, and a positive fourth lens are joined together in order from the object side and a cemented surface has a concave surface toward the image side. A predetermined conditional expression is satisfied.