65results about How to "Reduce coma" patented technology

An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.

An image taking optical system, sequentially arranged from an object side to an image side along an optical axis comprising: a front lens group, a stop and a rear lens group. The front lens group comprises at least a meniscus front-group first lens element with a convex object-side surface. The rear lens group comprises at least three lens elements. Through the means of field adjustments that result in desirable distorted images, the image taking optical system may shorten the total length while enhancing the ability to create a larger field of view for panorama usages in compact cameras and mobile phones.

The invention discloses an improved off-axis imaging system which comprises a lens that is arranged in a way of off-axially deflecting an angle, and the angle leads a lens axis to dead against an object space. An improved off-axis imaging method comprises the step of deflecting the lens with the angle when a light path is off-axially arranged so as to lead the state of the lens axis to be changed into the state of being dead against the object space into the state of being vertical to the object space. An ophthalmonogy probe imaging system comprises an OCT processing device and an ophthalmonogy probe, wherein the ophthalmonogy probe comprises an illumination light path, an object lens, a lens and a photoelectric conversion unit, an image formed by eyeground reflected light through the object lens is used as the object space which is imaged on the photoelectric conversion unit through the lens, the lens is arranged in a way of off-axially deflecting an angle, and the angle leads the lens axis to dead against the image. The ophthalmonogy probe imaging system reduces various imaging aberrations such as chromatic aberration, spherical aberration, astigmatism, coma and the like with respect to an off-axis light path, is beneficial to improve the imaging definition, and also keeps the advantages of the off-axis light path with respect to a coaxial light path.

The invention relates to a refraction and reflection type large aperture and large field of view imaging system. The refraction and reflection type large aperture and large field of view imaging system is characterized in that a refraction type correction plate, a reflection type primary mirror and a refraction type correction mirror group are successively arranged along an optical axis from the outside to the inside; the central area of the second surface of the correction plate is plated with a reflective coating layer, and becomes a reflection type secondary mirror; an incident light beam irradiates to the reflection type primary mirror through the refraction type correction plate; the reflection type primary mirror reflects the incident light beam to the reflection type secondary mirror; and the reflection type secondary mirror reflects the light beam to the refraction type correction mirror group, and then the light beam passing through the refraction type correction mirror group is converged on a focal plane of an optical system. The refraction and reflection type large aperture and large field of view imaging system sets the refraction type correction plate within the focus of a reflection type spherical main mirror and takes the central area of the second surface of the correction plate as the reflection type secondary mirror and the diaphragm, thus having the advantages of ultra-short lens barrel and large field of view, and being able to be widely applied to the astronomy, aviation, security and protection, and other photoelectric imaging fields. The refraction and reflection type large aperture and large field of view imaging system can realize aberration reducing design for a 11DEG-15DEG field of view. However, the field of view for a traditional refraction and reflection type imaging system is only 3DEG-4DEG.

The invention relates to a virtual-reality eyepiece designing and manufacturing method. The virtual-reality eyepiece designing and manufacturing method includes: according to design requirements, designing an eyepiece with the field angle being around 90 degrees and conforming to optical performance requirements, wherein the eyepiece is provided with double convex aspheric surfaces; modifying one surface into a plane substrate Fresnel surface and simultaneously optimizing the parameter of the plane substrate Fresnel surface and the other surface parameter to acquire the eyepiece with the plane substrate Fresnel surface; modifying a plane substrate of the eyepiece into an aspheric substrate and simultaneously optimizing the aspheric substrate surface parameter, the Fresnel tooth parameter on the aspheric substrate and the other surface parameter to acquire the eyepiece with the aspheric substrate Fresnel surface; connecting all tooth tops of the aspheric substrate Fresnel surface in the eyepiece well designed and having the aspheric substrate Fresnel surface into a basic surface, and producing the eyepieces with the basic surfaces in batch by means of injection molding; cutting the basic surfaces in the eyepieces subjected to injection molding and provided with the basic surfaces with a single-point diamond to remove filling parts of the basic surfaces connected through the tooth tops.

An optical pickup includes: first and second objective lenses focusing light beams of different wavelengths on first and second optical discs having different thickness protection layers; a coma aberration generating unit generating coma aberration in the light beams; a collimating lens between a light source and the first objective lens; and a collimating lens driving unit. The protection layer thickness of the plastic first optical disc is smaller than that of the second optical disc. The first objective lens satisfies a lens tilt coma aberration sensitivity of 0 to 0.3[λrms / °]. An optical axis of the light beam approximately coincides with an optical axis of the first objective lens. The optical pickup is inclined to the optical disc so that initial coma aberration with respect to the first optical disc is optimally corrected. The coma aberration generating unit is used for obtaining optimal reproducing environment when reproducing the second optical disc.

The invention provides an ellipsoidal reflector perifocus high-precision positioning device and method, and belongs to the optical confocal microscopy technical field and optical precise measurement field. The device is formed by a lower light path for ellipsoidal reflector apofocus high-precision positioning and an upper light path for ellipsoidal reflector perifocus high-precision positioning. The method is characterized by, to begin with, carrying out ellipsoidal reflector apofocus positioning through the lower light path; and then, carrying out ellipsoidal reflector perifocus positioning through the upper light path. The device and method, to begin with, by making full utilization of the special feature of ellipsoidal reflector bifocus conjugation, provide a technological means for ellipsoidal reflector perifocus positioning, and then, realize ellipsoidal reflector perifocus high-precision positioning through an imaging technological means; and the device and method provide the technological means for a precise-adjustment ellipsoidal reflector to reduce coma and astigmatism of the ellipsoidal reflector, and play a promotion role in application and development in the optical confocal microscopy technical field and the optical precise measurement field.

The invention discloses an optical imaging lens assembly. The optical imaging lens assembly includes, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. At least one surface among object-side surfaces and image-side surfaces of the six lens elementsof the optical imaging lens assembly has at least one critical point in an off-axial region thereof and is aspheric.

The invention provides an optical imaging lens. The optical imaging lens sequentially comprises, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens with positive focal power, wherein the image side surface of the third lens is a convex surface, a fourth lens with positive focal power, a fifth lens, a sixth lens, and a seventh lens with negative focal power, wherein half of the maximum field-of-view semi-FOV of the optical imaging lens meets the following condition: Semi-FOV is greater than 70 degrees and less than 90 degrees; the maximum value Namx of the refractive indexes of the first lens to the seventh lens meets the condition that Namx is greater than 1.7; the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis meet the following condition: (T34 + T45) / CT4 is greater than 0.5 and less than 1.0; and the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens meet the condition that f4 / f1 is greater than -1.0 and less than -0.5. The problem that an optical imaging lens in the prior art is poor in optical performance is solved.

The whole reflection signal and a tracking error signal are detected while an objective lens is being moved in the radial direction of an optical disk, and the temporal difference between a time at which the value of the whole reflection signal becomes a maximum and a time at which the value of the tracking error signal becomes zero is detected in a predetermined time period. In addition, a value which is obtained by dividing the temporal difference by the time period of one cycle of the tracking error signal is acquired as a tilt appearance magnitude. Relational information in which a tilt appearance magnitude and a tilt correction magnitude corresponding to the tilt appearance magnitude are associated is read out, and the relational information read out and the current tilt appearance magnitude detected by a tilt-appearance-magnitude detection circuit are compared, thereby to determine the tilt correction magnitude necessary for a tilt correction. The tilt correction magnitude is notified to a tilt correction circuit, and is used in making the tilt correction.

An optical pickup includes: a light source emitting a beam having a predetermined wavelength; a plastic objective lens condensing the emitted beam on an optical disc; a light detector receiving and detecting the beam reflected by the optical disc; an objective-lens driving unit driving the objective lens in the tilt direction to tilt the objective lens; and a tilt-sensitivity sensing unit sensing a tilt sensitivity denoted by ΔWLT / Δθ, where ΔWLT [λrms] is a coma aberration amount Δθ [deg] is a tilt amount at the time of tilting the objective lens, wherein, in the case where the sensed tilt sensitivity is equal to or larger than a predetermined value, tilt is corrected by tilting the objective lens so that signal quality detected by the light detector is improved, and in the case where the sensed tilt sensitivity is smaller than the predetermined value, tilt is not corrected.

The invention discloses a Cassegrain telescope adjustment mechanism and adjustment method, and the mechanism comprises a laser which is used for emitting a light beam to a primary mirror of a Cassegrain telescope, a rotating mechanism which is used for driving the laser to rotate around the optical axis of the primary mirror, and a light receiving part which is vertically disposed on the optical axis of the primary mirror. The optical axis of emergent light of the laser is parallel to the optical axis of the primary mirror, and the light receiving part can move in the direction of the opticalaxis of the primary mirror. When the Cassegrain telescope is adjusted, the optical axis of laser emitted by the laser emitter is parallel to the optical axis of the primary mirror, one end of the backsurface of the primary mirror is provided with a group of light receiving parts, a rotary laser and a movable light receiving part, and the change of the circle center and the diameter of a circle formed by a plurality of projection points on the light receiving parts at different positions is compared. The distance and the inclination angle between the primary mirror and the secondary mirror areadjusted, the influence of spherical aberration, coma, defocusing and other aberrations is reduced, and the measuring equipment is simple in structure, does not need to use an interferometer and is convenient to operate.

A method for compensating the coma aberration in a pickup of a recording and reproducing device that records or reproduces data on or from an optical disc using the pickup is provided. The method includes a first coma aberration compensating step to compensate coma aberration in a body of an optical system including an objective lens for emitting a light beam to an optical disc including a plurality of recording layers and a second coma aberration compensating step to compensate coma aberration caused by relative inclination of the optical system with respect to the optical disc.

An objective lens actuator includes a plurality of objective lenses, a first lens holder on which the plurality of objective lenses are mounted, and a drive mechanism that drives the first lens holder. At least one of the plurality of objective lenses is mounted on the first lens holder while being held by the second lens holder. Formed on the second lens holder are a slide part which slides the second lens holder with respect to the first lens holder at a time of assembly, and a projection arranged outward of the slide part and protruding toward the first lens holder with the second lens holder being mounted on the first lens holder. The lens holder has a groove formed therein where the projection is securely adhered.

The invention discloses an improved off-axis imaging system which comprises a lens that is arranged in a way of off-axially deflecting an angle, and the angle leads a lens axis to dead against an object space. An improved off-axis imaging method comprises the step of deflecting the lens with the angle when a light path is off-axially arranged so as to lead the state of the lens axis to be changedinto the state of being dead against the object space into the state of being vertical to the object space. An ophthalmonogy probe imaging system comprises an OCT processing device and an ophthalmonogy probe, wherein the ophthalmonogy probe comprises an illumination light path, an object lens, a lens and a photoelectric conversion unit, an image formed by eyeground reflected light through the object lens is used as the object space which is imaged on the photoelectric conversion unit through the lens, the lens is arranged in a way of off-axially deflecting an angle, and the angle leads the lens axis to dead against the image. The ophthalmonogy probe imaging system reduces various imaging aberrations such as chromatic aberration, spherical aberration, astigmatism, coma and the like with respect to an off-axis light path, is beneficial to improve the imaging definition, and also keeps the advantages of the off-axis light path with respect to a coaxial light path.

The invention belongs to an optical system, and particularly relates to a wide angle optical lens which is wide in spectrum and high in image quality. The wide angle optical lens comprises a window, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the window, the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens, the seventh lens and the eighth lens are coaxial with one another; the window, the lenses and the diaphragm are connected through a lens cone. Compared with the prior art, the wide angle optical lens has the advantages that by reasonably selecting the surface radius, thickness, distance and materials of the lenses, the image plane illuminance and an optical transfer function are increased, all kinds of lens aberrations, spherical aberrations, coma aberrations, astigmatism, field curvature, chromatic aberrations and distortion are reduced, and the wavelength range is broadened.

The invention relates to a low-distortion large-field image space telecentric optical device using an aspheric surface technology. The low-distortion large-field image space telecentric optical device comprises a first negative lens, a lens screen, a first positive lens, a second positive lens and a second negative lens which are sequentially arranged on the same light path, wherein the second positive lens and the second negative lens are glued, and the first surface of the first positive lens is an evenorder aspheric surface. The invention provides a front imaging device being designed aiming at 660 nano glow illumination and being capable of meeting high-precision measurement and full-filed illumination uniformity requirement and being applied to an optical fiber coherent fiber bundle.

The system and methods of the present invention are directed to an optical pickup. The optical includes at least a light source, a lens for focusing and irradiating light from the light source on a recording medium, and an optical pickup element. The optical pickup element includes a lens base plate in which a lens made of a material having a high refractive index is embedded within a transparent base plate to pass incident light. The optical element further includes an aberration correction base plate formed of a transparent parallel flat plate-like base plate to pass light and correcting a comatic aberration produced on the lens. The lens base plate and the aberration correction base plate are integrated such that the lens base plate and the aberration correction base plate are parallel to each other. Moreover, the aberration correction base plate is located on the side of a point at which incident light is focused by the lens.. The optical element can reduce the diameter of the lens, increase the radius of curvature of the lens, and correct a comatic aberration produced when an optical axis of incident light is inclined relative to the lens.

An optical pick-up device is provided that reduces aberrations in light irradiated from an optical recording meidu. The device includes a light source that outputs light for recordation and reproduction of information onto the optical recording medium. An objective lens irradiates the light onto the optical recording medium by concentrating the light. An actuator adjusts the movement of the objective lens to focus the light on at least one or more layers of the optical recording medium. A controller moves the objective lens to substantially reduce the aberration occurring in the light irradiated from the optical recording medium by driving the actuator, such that aberrations, such as asymmetrical aberrations or coma aberrations, may be reduced and corrected.

The invention discloses a near-infrared fluorescence spectrophotometer based on a miniature scanning grating micromirror. The near-infrared fluorescence spectrophotometer comprises a detection chamber, a fluorescence excitation module and a near-infrared fluorescence splitting and spectrum obtaining module, rapid acquisition of near-infrared full-spectrum information is realized by integrating the scanning grating micromirror, a three-dimensional full spectrum of a measured substance can be obtained within one minute by combining with the fluorescence excitation module, and the influence of coma can be effectively reduced by the fluorescence excitation module; a plano-convex cylindrical mirror in the near-infrared fluorescence splitting and spectrum acquisition module is utilized to ensure the imaging quality of near-infrared fluorescence spectrum, aberration caused by an optical system in the fluorescence spectrum information acquisition process is greatly reduced, the spectral resolution and the signal-to-noise ratio are improved, near-infrared spectrum information detection is realized by utilizing a single-tube detector, the spectrum information acquisition speed is ensured, the structure of an optical system is simplified, the cost is reduced, and the system has the advantages of modularization, miniaturization, wide spectrum, high resolution, high signal-to-noise ratio, low cost, high detection speed and the like.

The invention provides an optical imaging lens. From the object side of the optical imaging lens to the image side of the optical imaging lens, the optical imaging lens sequentially comprises: a first lens, wherein thefirst lens has positive focal power, and the object side surface of the first lens is a convex surface; a second lens, wherein the second lens has negative focal power, and the image side surface of the second lens is a concave surface; a third lens, wherein the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens, wherein the fourth lens has positive focal power; a fifth lens, wherein the fifth lens has focal power; and a sixth lens, wherein the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the condition that f / EPD <1.9; and the maximum field angle FOV of the optical imaging lens meetS the condition that 0.5<tan(FOV) <1.5. The problem that in the prior art, an optical imaging lens is poor in imaging quality is solved.

The invention discloses a high-precision positioning device and a high-precision positioning method for a far focus of an ellipsoidal reflector. The high-precision positioning device and the high-precision positioning method belong to the field of optical confocal microscopic technologies and optical precise measurement. The high-precision positioning device comprises a lapping optical path which is composed of optical elements such as laser devices, and further comprises an ellipsoidal reflector and the like. The high-precision positioning method comprises the steps of firstly, conducting effective imaging by means of an image sensor, then adjusting a six-degree-of-freedom workbench, acquiring a series of intensity information and roundness information of a light spot, merging the information into an evaluation function, establishing a degree-of-freedom and evaluation function table, finding out an extreme value of the evaluation function and a degree of freedom corresponding to the extreme value in the degree-of-freedom and evaluation function table, and finally adjusting the six-degree-of-freedom workbench according to the degree of freedom corresponding to the extreme value such that a focus of a focusing objective lens coincides with the far focus of the ellipsoidal reflector. The high-precision positioning device and the high-precision positioning method fully utilize the special property of the bifocal conjugation of the ellipsoidal reflector, and realize precise positioning of the ellipsoidal reflector through providing a technological means for positioning the far focus of the ellipsoidal reflector by utilizing the imaging light spot information.

The invention provides a projection lens optical system. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens,an eighth lens and an imaging target surface which are sequentially arranged from an object side to an image side and share the same optical axis. According to the invention, a plurality of lenses are combined, and the design of focal power and shape structures of the first lens to the eighth lens and the position design of each lens are combined, so that the projection lens optical system is ina phi 30 large target surface range, on-axis and off-axis aberrations are fully corrected, the imaging quality is not obviously changed along with the view field, the consistency is good, and the optical characteristics are excellent.

The invention relates to an imaging system which comprises a first lens (E1), a second lens (E2), a third lens (E3), a diaphragm (STO), a fourth lens (E4), a fifth lens (E5), a sixth lens (E6) and a seventh lens (E7) which are sequentially arranged from an object side to an image side along an optical axis, and the first lens (E1), the second lens (E2), the third lens (E3) and the sixth lens (E6) all have focal power; the fourth lens (E4) has negative focal power, the fifth lens (E5) has positive focal power, and the seventh lens (E7) has negative focal power. The imaging system has excellent characteristics of ultra wide angle and the like, so that more photographing requirements can be met.

The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with positive focal power from an object plane side to an image plane side, the zoom lens at least comprises four aspheric lenses; and the zoom lens satisfies the following conditional expressions: 1.5<FNO<4, 15<ft / fw<20, wherein fno is the number of apertures of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, and fw is the focal length of the wide-angle end of the zoom lens. According to the invention, the influence of the environment temperature change on the zoom lens is reduced as much as possible, then the possibility of focal plane offset of the zoom lens is reduced, the possibility of image blurring of the zoom lens is reduced, and the imaging quality of the zoom lens is improved.