A thermally stabilized fastener system and method is disclosed. The disclosed system/method integrates a fastener (FAS) incorporating a faster retention head (FRH), fastener retention body (FRB), and fastener retention tip (FRT) to couple a mechanical member stack (MMS) in a thermally stabilized fashion using a fastener retention receiver (FRR). The MMS includes a temperature compensating member (TCM), a first retention member (FRM), and an optional second retention member (SRM). The TCM is constructed using a tailored thermal expansion coefficient (TTC) that permits the TCM to compensate for the thermal expansion characteristics of the FAS, FRM, and SRM such that the force applied by the FRH and FRR portions of the FAS to the MMS is tailored to a specific temperature force profile (TFP) over changes in MMS/FAS temperature. The TCM may be selected with a TTC to achieve a uniform TFP over changes in MMS/FAS temperature.

An optical detector includes a light emitting unit and a light receiving unit that receives a reflected light reflected by a measurement object. The light receiving unit has a detection element and a condenser lens system that collects the reflected light to the detection element. The condenser lens system has a plurality of lenses. The condenser lens system has a temperature change factor that increases the optical power at a high temperature than at a low temperature, and a chromatic aberration factor that decreases the optical power at a long wavelength than at a short wavelength. The optical power of each of the plurality of lenses is adjusted based on a correspondence between a change in temperature and a shift amount of the peak wavelength, so that the chromatic aberration factor balances with the temperature change factor within a predetermined wavelength range.

An imaging lens system includes a lens element and an aperture element surrounding an imaging optical path and forming an aperture. The aperture element includes a first conical surface, a second conical surface and a contact surface. The first and second conical surfaces surround the imaging optical path. The contact surface is perpendicular to the imaging optical path and contacts the lens element. When the imaging lens system is in a first environment condition, the first conical surface is in contact with the lens element, the second conical surface is spaced apart from the lens element, and the aperture is aligned with the optically effective region. When the imaging lens system is in a second environment condition, the second conical surface is in contact with the lens element, the first conical surface is spaced apart from the lens element, and the aperture is aligned with the optically effective region.

An optical device and use thereof are provided. The optical device includes: at least one lens element, a lens barrel and at least one heating element, wherein the lens barrel has an installation cavity, the lens element is installed in the installation cavity, and the heating element is arranged to contact a surface of the lens element near an object side in a manner capable of being powered-on to generate heat; or, the heating element has at least two terminals, and at least two conductive elements are fixed at positions in contact and electrical connection with the corresponding terminals, respectively. According to the above technical solution, the heating element can generate heat, to heat the lens element so as to accelerate the dissipation of moisture attached to the surface, has an active defogging and defrosting function, and can prevent against fogging or frosting.

A heating device for a lens barrel of an automotive camera assembly includes a heating element adapted to apply heat along the circumference of the lens barrel, and a tension socket and/or a tension ring adapted to press a ring-shaped part of the heating element against the lens barrel circumference. A camera system, an external rear view device, and a motor vehicle, each with at least one such heating device are also described.

A camera module includes a mounting frame defining a first through hole, a filter installed in the first through hole, and a circuit board including a first surface and a second surface. The mounting frame is on the first surface. An air escaping channel is recessed from the second surface, an air escaping hole penetrates the first surface and the second surface and communicates with the air escaping channel. The circuit board, the mounting frame, and the filter cooperate with each other to form a first cavity, the first cavity communicates with the air escaping hole. The air escaping channel includes a first channel portion and a second channel portion, an angle is formed between the first channel portion and the second channel portion. The air escaping hole communicates with the first channel portion, the second channel portion extends to an edge of the circuit board to form an opening.

Provided is a lens apparatus including: a lens; detectors configured to detect temperatures at a plurality of mutually different positions of the lens apparatus, respectively; and a processor configured to obtain a change amount of a temperature per unit time with respect to each of the plurality of mutually different positions based on each of the detected temperatures and a time at which each of the detected temperatures is obtained, to estimate a temperature of the lens based on the change amount with respect to each of the plurality of mutually different positions.

An imaging lens assembly includes, in order from an object side to an image side, a first lens element and a second lens element. The first lens element includes a first frustum surface and a second frustum surface. The first frustum surface is disposed on a side of the first lens element facing towards the second lens element. The first frustum surface and the second frustum surface are disposed on the same side and coaxial, and the second frustum surface is closer to an optical axis than the first frustum surface to the optical axis. The second lens element includes a first corresponding frustum surface and a second corresponding frustum surface. The first corresponding frustum surface is corresponding to the first frustum surface. The second corresponding frustum surface is corresponding to the second frustum surface.

A method for producing a camera module. An objective is aligned with respect to an image sensor and is then fixed in position by being joined to a support that receives the image sensor, a housing that surrounds the image sensor, or an interposed connection structure as a joining partner. The objective is mounted on spacer elements, which are initially still movable, and is then aligned with respect to the image sensor by moving the spacer elements. After the objective is aligned, the spacer elements are welded to the objective and the joining partner. A camera module is also described.

A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. A first distance between the center of a fixing portion of the lens holding member and the center of the first bearing portion in the direction X is set to be longer than a second distance between the center of the fixing portion and the center of the second bearing portion in the direction X. A first tilt-preventing member having a linear expansion coefficient lower than that of the lens holding member is fixed to a region, which is closer to the first bearing portion than the center of the fixing portion, of a portion of the guided portion positioned between the first and second bearing portions.