4 results about "Normal lens" patented technology

The application discloses a compact visible wide-angle athermalization lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence along the direction of light path propagation; the first lens is a negative meniscus plastic lens, both surfaces of which are even aspheric surfaces; the second lens is a positive meniscus plastic lens, both surfaces of which are even aspheric surfaces; the third lens is a positive diopter glass lens, both surfaces of which are standard spherical surfaces; the fourth lens is a negative diopter plastic lens, both surfaces of which are even aspheric surfaces; and the fifth lens is a positive diopter plastic lens, both surfaces of which are even aspheric surfaces. The lens is short in length and light in weight, and belongs to a wide-angle lens between a standard lens and a fisheye lens in terms of field of view and focal length; the lens can keep the image plane stable within a temperature difference range of -20 degrees to 60 degrees without focusing adjustment, and the pictures in daytime and at night have good co-focusing property, so that the lens can meet the needs of the current market for monitoring lenses.

The application discloses an optical lens, an assembling method thereof and a camera module. The assembling method comprises the following steps: (a) allowing an upper lens group, a standard lens group and a lower lens group to be arranged approximately along an optical axis; (b) calibrating the upper lens group, the standard lens group and the lower lens group; (c) allowing a focusing lens group to replace the standard lens group; and (d) assembling the upper lens group, the focusing lens group and the lower lens group to obtain the optical lens. In this way, the optical lens can be calibrated under high threshold performance, so that the optical performance of the optical lens is ensured.

The application discloses a device for quickly adjusting an optical element at multiple angles, which comprises a laser interferometer, an interferometer standard lens, a zero compensation mirror and a first adjusting mechanism; a rotating turntable is installed on the first adjusting mechanism, a second adjusting mechanism is installed on the rotating turntable, a third adjusting and detecting support platform is further installed on the second adjusting mechanism, and a detected optical element is arranged on the third adjusting and detecting support platform; the adjusting amount of each adjusting mechanism can be quickly calculated through a sensitivity matrix, so that the spatial position of each adjusting mechanism and the detected optical element can be quickly adjusted, the adjusting time is greatly saved, the adjusting difficulty is reduced, and the adjustment precision is higher through the coefficients of Zernike second, third, seventh and eighth items.

The invention provides an optical lens surface defect detection method and system. The method comprises the following steps: acquiring a corresponding multi-polarization-state image group through an industrial camera; generating a self-adaptive texture mask matched with the normal texture of the lens through a deep learning network based on the image features, and synchronously performing gray level layering processing on the multi-polarization-state image group according to the self-adaptive texture mask to generate a corresponding target polarization-state image; calculating polarization and gray features of pixels of the target polarization state image, performing synchronous fusion to construct a corresponding feature set, and performing clustering processing on the feature set by adopting a density peak clustering algorithm so as to obtain an initial defect candidate area through threshold value screening; and extracting multi-dimensional feature parameters of the initial defect candidate region to construct a corresponding feature verification library, and removing the stain edge and the pseudo-defect region of the initial defect candidate region through the feature verification library to detect a corresponding target defect region. The detection efficiency can be effectively improved.