3results about How to "Avoid stray light" patented technology

This utility model discloses a broadband imaging lens, comprising a lens group disposed inside the lens barrel. The lens group, arranged sequentially along the optical axis from the object plane to the image plane, includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, all of which are positive diopter glass spherical lenses. The first lens has a convex object-side surface and a concave image-side surface; the second lens has a convex object-side surface and a concave image-side surface; the third lens has a convex object-side surface and a concave image-side surface; the fourth lens has a convex object-side surface and a concave image-side surface; and the fifth lens has a convex object-side surface and a convex image-side surface. This broadband imaging lens has an EFL of 50mm, a spectral range of 400–1000nm, weighs less than 100 grams, has a center MTF of 32lp / mm > 0.5, and an edge MTF of 32lp / mm > 0.3. It exhibits high image quality, small size, low cost, and the lens head is also waterproof and dustproof.

This utility model discloses a light source module and a fiber optic scanning display device. The light source module includes: a light source; a pigtail disposed in the outgoing light path of the light source; the pigtail includes a fiber optic fixing structure and a fiber; the fiber protrudes from the end face of the fiber optic fixing structure, and the fiber coupling end face is an inclined end face. In the above solution, by having the fiber protrude from the end face of the fiber optic fixing structure, stray light caused by the adhesive used to bond the fiber can be avoided, thereby reducing image stripes and noise caused by the back-propagation of stray light into the laser, thus alleviating the technical problem of image quality defects existing in the prior art and achieving the technical effect of improving image quality.

The utility model provides a reflecting cover which comprises a shell and a cover body structure arranged in the shell. Wherein the cover body structure is a deep drawing structural part formed by an aluminum base material composite reflecting sheet or a laser welding structural part formed by the aluminum base material composite reflecting sheet, so that the reflecting surface of the cover body structure is in a circumferential continuous form. The deep drawing structural part is of an integral hollow structure, splicing gaps in the axial side face can be completely eliminated, light is prevented from leaking from the gaps or stray light is prevented from being generated, it is ensured that the light is directionally reflected through the light reflecting face, and the light efficiency utilization rate is increased. According to the laser welding structural part, the splicing gap of the aluminum base material composite reflector can be controlled to be in the micron order, the effect is close to the seamless effect of the axial side face, the risk of light leakage is remarkably reduced, and the lighting effect treatment effect of the reflector is improved.