A lens unit includes: a lens group in which a plurality of lenses are aligned along an optical axis of the lenses; a lens barrel that integrally supports the lens group; an intermediate ring; and an elastic member having an annular shape and provided between the lens and the intermediate ring, the lens being adjacent to the elastic member in the optical axis direction, and including a recess having an annular shape, the elastic member is provided in a compressed state, and the elastic member presses the lens disposed on an object side of the elastic member against an end portion of the lens barrel on the object side, presses the lens disposed on an image side of the elastic member against an end portion of the lens barrel on the image side via the intermediate ring, and absorbs rattling.

An optical device comprises at least one printed circuit board, the printed circuit board includes an electronic image-capture circuit, a lens holder comprising at least one optical lens, the lens holder comprising a wall forming a cavity extending along the optical axis of the device from its top end to its bottom end, the bottom end being mounted on the rigid printed circuit board so as to align, along the optical axis of the device, the electronic image-capture circuit and the optical lens, a flexible heater band arranged in contact with the wall of the lens holder and around the wall of the lens holder, the heater band comprising an electrical connection interface electrically connected to at least one rigid printed circuit board of the optical device.

A resistance heater may include a polymer positive temperature coefficient (PPTC) material, arranged in a ring shape that defines a heater body; and an electrode assembly, comprising two or more electrodes arranged in contact with the heater body at two or more locations, wherein PPTC material comprises: a polymer matrix, the polymer matrix defining a PPTC body; and a conductive filler component, disposed in the polymer matrix.

A wearable electronic device is disclosed. The device can include a support structure and an electronic component disposed in or on the support structure. A heat exchanger element can be thermally coupled with the electronic component, the heat exchanger element comprising a fluid inlet port and a fluid outlet port. A first conduit can be fluidly connected to the fluid inlet port of the heat exchanger, the first conduit configured to convey, to the heat exchanger, liquid at a first temperature. A second conduit can be fluidly connected to the fluid outlet port of the heat exchanger, the second conduit configured to convey, away from the heat exchanger, liquid at a second temperature different from the first temperature.

The present disclosure relates to systems, vehicles, and methods that include adjusting a position of an image sensor with respect to a lens assembly. An example optical system includes a lens assembly having at least one lens. The at least one lens defines an optical axis, a focal distance, and a focal plane. The optical system also includes a lens holder coupled to the lens assembly and a substrate having a first surface. The optical system additionally includes an image sensor attached to the first surface of the substrate. Furthermore, the optical system includes an active compensation system having a piezoelectric structure coupled between the lens holder and the first surface of the substrate. The active compensation system is configured to maintain the image sensor at the focal plane over a predetermined temperature range.

An eyepiece device for a surgical instrument, the eyepiece device including: an eyepiece frame; and at least one optical unit accommodated in the eyepiece frame, wherein the at least one optical unit comprises at least one first optical element and a second optical element connected with the at least one first optical element, wherein the second optical element is formed from a second material with abnormal dispersion and the first and the second optical elements together correct chromatic aberration; wherein the eyepiece frame comprises an expansion chamber for at least the second optical element, the expansion chamber forming an installation space for at least the second optical element in a radial direction.

An image capturing lens system includes a first lens having negative refractive power, a second lens having positive refractive power while having a convex object-side surface, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power with a concave object-side surface and a concave image-side surface, and a sixth lens having positive refractive power.

A lens unit includes a correction lens that corrects movement of a focus position of an optical system, a holding frame that holds the lens, a stationary tube that movably supports the frame along a direction of an optical axis, a movement guide portion that is provided between the tube and the frame in a radial direction of the tube and limits rotation of the frame in a direction intersecting with a plane orthogonal to the optical axis and guides movement of the frame in the direction of the optical axis, bimetals that are provided between the tube and the frame in the direction of the optical axis and change a distance between the frame and the tube along the direction of the optical axis, and a first biasing means that relatively biases the frame against the tube via the movement guide portion in the radial direction of the tube.

A projection lens has a lens barrel holding a lens. In a case where an image forming panel is disposed to be shifted with respect to an optical axis of the projection lens, in a second part on a side to which the image forming panel is shifted with respect to the optical axis of the projection lens, there is a great increase in temperature, and in a first part on the opposite side, there is a small increase in temperature. A lens barrel heating optical section has a first mirror, condensing lenses, and a second mirror. The lens barrel heating optical section emits the redundant light, which is reflected by the color wheel, toward the first part of the lens barrel. By heating the first part through redundant light, temperature distribution in the circumferential direction becomes uniform, and deterioration in performance of the projected image is suppressed.

In a case where an image forming panel is disposed to be shifted with respect to an optical axis of a projection lens having a lens barrel holding the lens, in the lens barrel, the increase in temperature in a first part on a side to which the image forming panel is shifted is larger than that in a second part on an opposite side. A temperature adjustment section includes a cooling duct, a heating duct, a connecting duct, and blowers 27 and. Air, which is suctioned from an inlet of the cooling duct, is passed through the first part, a light source, and the second part, sequentially by the blowers. The air cools down the first part, and heats the second part. Thereby, the temperature distribution in the circumferential direction of the lens barrel becomes uniform, and deterioration of the projected image is suppressed.