9results about How to "Avoid stray light" patented technology

The utility model belongs to the technical field of medical instruments, and particularly relates to an artificial lens for people with color vision disorder. The surface of the intraocular lens is a spherical surface or at least one surface is an aspheric surface or at least one surface is a discontinuous surface, the intraocular lens is colored and at least uses one coloring dye, and the coloring range of the intraocular lens at least comprises part of an optical area. According to the intraocular lens, at least one inhibition band exists in the wavelength range of 380 nm to 780 nm of the spectrum transmittance of the intraocular lens, and the minimum value of the spectrum transmittance in the inhibition band is lower than the nearest peak value of the spectrum transmittance in the wavelength range of 380 nm to 780 nm, so that the situation that the surface roughness is too high due to film coating is avoided, cell deposition on the surface of a film layer is avoided, the color vision correction safety is improved, and the color vision correction efficiency is improved. The correction effect of color vision correction is guaranteed, the problem that the surface reflectivity is high due to the fact that the surface of the artificial lens is coated with a film is effectively solved, optical interference is prevented, the retina is prevented from receiving stray light, and the signal-to-noise ratio of a retina image is prevented from being reduced.

The utility model relates to a heterogeneous bonding optical waveguide sheet, which comprises an optical waveguide layer made of wide bandgap semiconductor materials and a glass substrate made of high refractive index glass, the optical waveguide layer is arranged on the glass substrate, and a grating structure is arranged on the surface, away from the glass substrate, of the optical waveguide layer. The high-refractive-index glass optical waveguide sheet solves the problems that the refractive index of an existing high-refractive-index glass optical waveguide sheet reaches 2.0, stray light is generated through secondary coupling out and the like, and has the advantages of being high in refractive index, large in FOV, full-color in single sheet and capable of reducing rainbow lines.

The invention provides a reflector thermal deformation testing device and method, and relates to the technical field of optical alignment and detection. The testing device comprises an interferometer, a three-comprehensive test box, a standard plane reflector, a first window glass, a second window glass and a holographic original. Firstly, the thermal deformation of the window glasses on both sides of the three-comprehensive test box is measured, and then the thermal deformation of the reflector to be measured is measured, and the surface errors caused by the two thermal deformations are analyzed and calculated to obtain the Zernike polynomial coefficient value of the reflector to be measured. The surface value of the reflector to be measured is obtained through fitting analysis, which is the thermal deformation of the reflector to be measured. The problem that it is difficult to accurately measure the surface shape change under the actual load working environment and the influence of the window glass on the reflector to be measured in the prior art is solved, and the test accuracy is improved. In addition, the surface error of the reflector to be measured can be quantitatively analyzed through the Zernike polynomial coefficient values ​​of each item in the test result.

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, and the lens group is composed of seven lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the at least one spacer comprises a fifth spacer and a sixth spacer; f6 / (EP56 + CT6) is greater than or equal to-122.21 and less than or equal to-106.77; and d6s / (R12 / R11) is more than or equal to-3.74 mm <-1 > and less than or equal to-1.73 mm <-1 >. According to the invention, the problem that stray light at the tail end is increased due to the fact that a seven-piece optical imaging lens in the prior art meets low aberration is solved.

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 invention discloses a pick-up lens, and the pick-up lens comprises a lens cone, and a lens group and a bearing member group which are disposed in the lens cone. The lens group sequentially comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from the object side to the image side along the optical axis; the bearing piece group comprises a first bearing piece which is arranged on the image side of the first lens and is at least partially contacted with the image side surface of the first lens, and a second bearing piece which is arranged on the image side of the second lens and is at least partially contacted with the image side surface of the second lens; the maximum height L of the lens barrel in the optical axis direction and the maximum half field angle Semi-FOV of the camera lens meet the following conditions: 4.4 mmlt; l * tan (Semi-FOV) lt; 5.8 mm in diameter; the effective focal length f2 of the second lens, the inner diameter d2s of the object side surface of the second bearing piece and the inner diameter d1m of the image side surface of the first bearing piece meet the following conditions: 3.6 mmlt; f2 / (d2s / d1m) lt; the thickness is 5.0 mm.

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.

According to the diffraction optical waveguide provided by the invention, the first magnetic coating and the second magnetic coating which are different in magnetism are arranged on the opposite surfaces between the waveguide sheet and the cover plate of the diffraction optical waveguide, and the contact mode of the waveguide and the cover plate is changed through the mutual exclusion effect between the first magnetic coating and the second magnetic coating; the cover plate is restored to an original state, and long-term use of the diffraction optical waveguide is facilitated; meanwhile, the first magnetic coating and the second magnetic coating are divided into a plurality of areas, the refractive indexes of the areas are different, and particularly, the refractive indexes of the coatings of internal and external orthographic projections in the grating structure area are different, so that on one hand, the contact form of the existing grating area and the cover plate is changed to avoid the Newton ring phenomenon, and on the other hand, the structure is simple. The influence of the arrangement of the coating on the total reflection of light in the waveguide is considered, the display uniformity and brightness are improved by limiting the refractive indexes of different areas on the premise of ensuring the display effect of the diffractive optical waveguide, and the visual imaging effect of eyebox is ensured.