59results about How to "Improve Optical Imaging Quality" patented technology

An HMD device is provided, comprising an image element for generating an image and imaging optics projecting the image such that it is perceivable by a user wearing said HMD device, wherein said imaging optics comprise a first optical group including a first lens, which has negative refractive power, and a second lens, which has positive refractive power, a deflecting element arranged following the first optical group as well as a second optical group following the deflecting element, said second optical group comprising a third lens, and wherein, for correction of astigmatism and distortion, at least one surface of the first and second lenses is aspheric and, for correction of the spherical aberration, at least one surface of the third lens is aspheric.

A lens adapted to image a first image plane at a reduced side onto a magnified side is provided. The lens has an optical axis. The lens includes a lens group and a concave reflective mirror. The lens group is disposed in the light path between the reduced side and the magnified side. The concave reflective mirror is disposed in the light path between the lens group and the magnified side. The offset of the first image plane with respect to the optical axis is greater than 100%. The throw ratio of the lens is less than 0.3.

The invention discloses an unblocked adaptive varifocal optical system and a calibration method thereof. The system conducts varifocal control by deformable mirrors; a Shack-Hartmann wavefront sensor in the system is connected with an adaptive control system assembly; the adaptive control system assembly is connected with two or more deformable mirrors; target light sequentially passes through each deformable mirror to enter an imaging lens assembly; a part of converged target light enters an imaging camera through a spectroscope for imaging; another part of the converged target light is reflected by the spectroscope to enter a first collimating lens through a field stop, and collimated to parallel light to enter the Shack-Hartmann wavefront sensor; image point data is measured; and the adaptive control system assembly revolves wave aberration according to the image point data and operates a corresponding correction signal, and controls at least one deformable mirror to correct the wave aberration of the system. The system is simple in structure, convenient to adjust, and high in imaging quality.

The invention relates to a living fingerprint capturer comprising an optical fingerprint imaging module and a fingerprint signal processing module, wherein the optical fingerprint imaging module comprises a light source, a prism, an imaging objective lens and an image sensor module which are arranged along an optical path; the image sensor module comprises an image sensor; the prism is a pentaprism comprising a sampling surface and an illuminating surface which are mutually parallel and over against as well as an imaging surface opposite to the imaging objective lens, and the rest surfaces of the pentaprism are all coated with shading layers; the light source is arranged below the illuminating surface of the pentaprism; and a diffusion membrane is arranged between the illuminating surface of the pentaprism and the light source. The invention has the advantages of good optical imaging quality, low false alarm rate, overall automatic induction control, and the like.

The invention discloses a lens module, which consists of four optical lenses. The lens module comprises a first optical lens group and a second optical lens group. The first optical lens group comprises first optical lenses with negative diopter. Each first optical lens is provided with a first surface and a second surface, wherein the first surface faces an amplification side; the second surface faces a reducing side; at least one of the first surface and the second surface is a non-spherical surface. The second optical lens group is configured between the first optical lenses and the reducing side, and moreover, the second optical lens group comprises second optical lenses, third optical lenses and fourth optical lenses which are arranged in sequence from the amplification side to the reducing side. The diopter of the second optical lenses, the diopter of the third optical lenses and the diopter of the fourth optical lenses are positive, negative and positive in sequence, and moreover, at least two of the second optical lenses, the third optical lenses and the fourth optical lenses respectively comprise non-spherical surfaces. Moreover, the effective focal length of each third optical lens is f3, and the refractive index is Nd3, whereas the effective focal length of each fourth optical lens is f4. Moreover, the lens module meets the formula as follow: the absolute value of f3/(f4*Nd3) is greater than 0.45 but is less than 1.2.

The invention provides a magnification regulating method of a projection optical system. The method comprises the following steps: firstly, providing a projection optical system, wherein the projection optical system comprises a front group, an aperture diaphragm and a rear group along the optical axis direction; the front group comprises a first glass group, a second glass group and a third glass group, wherein the first glass group and the third glass group have positive refractive powers, and the second glass group has negative refractive power; the rear group comprises a fourth glass group, a fifth glass group and a sixth glass group, wherein the fourth glass group and the sixth glass group have positive refractive power, and the firth glass group has negative refractive power; the front group and the rear group are in symmetry about the aperture diaphragm, and meanwhile, a group of lenses in symmetry in the third glass group and the fourth glass group are moved, and the projection magnification of the optical system can be regulated conveniently and effectively.

The invention relates to an alignment observation device which is applied to an exposure machine, in particular to a field-splitting microscope for realizing a rapid zooming function of an object lens. The field-splitting microscope consists of an object lens rapid-zooming device, an object lens system, an eye lens system and the like. The field-splitting microscope has the beneficial effects that the original field-splitting microscope is taken as a prototype, the operating distance of the lens and the distance between an eye-point exit pupil position and a working face are unchanged, the distance between the object lens and a reflector is increased, an object lens rapid-zooming mechanism is additionally arranged at the mounting position of the object lens, and the rotation part of the zooming mechanism is set into the form that the object lens locating surfaces of a lower turntable are positioned on the same horizontal plane; optimization design is carried out on an illumination system, and illuminating light and imaging light in a new light path are independently propagated in the horizontal direction; a steering structure of the light path is changed from an upright shape to a turning shape; and an eye-distance adjusting structure for the lens is changed from a straight-pull light-splitting structure to a rotary light-splitting structure. By utilizing the field-splitting microscope, the rapid zooming function of the object lens can be realized in the case of switchover between coarse alignment and fine alignment.

Disclosed is a micro-lens imaging multi-well test plate which comprises: a transparent plate of 3-5 mm in thickness with one or more trapezoidal wells locating in the middle of the plate, each of the wells is of an underside of 2-4 mm in diameter, 0.2-0.5 mm in thickness, a trapezoidal dip angle of 60-75°, and has a micro-lens which upper half is hemispherical, lower half is a cylinder, with radius of 0.1˜1.0 mm, height of 0.2˜2.5 mm, molded on the bottom of the well. The micro-lens imaging multi-well test plate is made of homogeneous optical transparent materials. When the trapezoidal concave wells of the test plate are filled with fluid to immerse the micro-lens, under parallel light illumination, due to the refraction effect of light, the image of micro-lens is a round one with an outer edge that is a black ring. The outer radius R of the black ring is the radius of the micro-lens, the inner radius r of the black ring is a function of the refractive index n₁ of the immersion liquid, the refractive index n₂ of the micro-lens and the height h of the micro-lens, so the refractive index of the sample fluid can be determined by monitoring the value of the inner radius r of the black ring with known values of R, n₂ and h. By using a multi-well test plate for imaging, the individual refractive indices of different sample fluids in all the wells can be determined simultaneously in one measurement.

The invention provides a projection optical device combining augmented reality and glasses. The device comprises a visual spectacle lens part and an augmented reality optical system part, wherein theeyesight glasses comprise two surfaces, one of which has a fixed curvature shared by the augmented reality optical system, and the other has an adjustable curvature, and by adjusting the curvature, myopia and hyperopia lenses with different degrees can be obtained; and the augmented reality optical system comprises six spherical surfaces, two aspherical surfaces and three free curved surfaces, thefirst spherical surface is shared with the first fixed curvature surface of the spectacle lens. Through the superposition of the glasses and the augmented reality optical system, the functions of glasses and augmented reality display can be realized simultaneously.

The invention relates to the technical field of virtual image imaging systems and discloses a virtual image imaging system with an anti-peep film. The system comprises an image source module, a lens in the imaging system, an observer position, a light trajectory, an outgoing light and an anti-peep film. Imaging light emitted by the image source module is reflected by a lens in the imaging system and the light trajectory is imaging light; and the light trajectory is reflected to the observer position by the lens in the imaging system. The image source module includes outgoing light. According to the invention, with the anti-peep film, the image source light is filtered partially by using the film with the anti-peep property, so that the outgoing light direction is controlled and thus the stray light emitted by the image source module is blocked; and thus the direction of the outgoing line of the image source is limited and the outgoing light is filtered. Therefore, special requirementson the incident light, the outgoing line, and the external interference light can be met; and the optical imaging quality of the whole system is improved.

The invention discloses an artificial lens applied to an imaging light path of eyes. The artificial lens comprises an optical part and is characterized in that the front surface and/ or the rear surface of the optical part is non-spherical surface through which the refractive power at different apertures of the eyes can be basically kept constant after the artificial lens is applied to the imaging light path of the eyes. The invention also discloses a method for manufacturing the artificial lens.

The invention provides a fusion imaging device of two-dimensional sonar and laser distance gating imaging equipment. The fusion imaging device is characterized by comprising a sealed cabin, an image function enhancing camera, two-dimensional multi-beam sonar equipment, a watertight plug, a lithium battery, an embedded computing hardware platform, a short pulse laser, a helmet display and a two-dimensional adjusting frame. The method has the advantages that 1) the influence of underwater backward scattered light is effectively reduced by adopting laser distance gating imaging equipment, and theoptical imaging quality is greatly improved; 2) a two-dimensional adjusting frame is arranged to facilitate adjustment of view field center positions of the image function enhancing camera and the two-dimensional multi-beam sonar equipment, and a diver can manually remotely control the light beam emitting direction of the auxiliary laser light source, so that an optical image can be convenientlyand rapidly obtained after the acoustic image obtains the position of a target; 3) the structure is simple and practical and can be used as a guiding and collision device for underwater divers, and 4)the overall structure is good in bearing performance and water tightness and high in engineering application feasibility.

The invention provides an HMD projection display optical system. From an object side to an eye side, the HMD projection display optical system comprises an Lcos, a PBS prism, a first prism and a second prism, wherein the second prism is a convex surface prism, one face is a convex spherical surface, and an inclined surface opposite to the convex spherical surface is coated with a semi-reflecting semi-transmitting film; the second prism is gummed with an inclined surface of the first prism through the semi-reflecting semi-transmitting film; light generated by a light source at one surface penetrates through the PBS prism and then irradiates the Lcos to generate an image, and the light of the image sequentially realizes reflection through the PBS prism, transmission of the first prism, reflection of the convex spherical surface and reflection of the semi-reflecting semi-transmitting film and then enters the eye; the outside scene above the first prism transmits through the first prism and the second prism and enters the eye. The HMD projection display optical system has advantages of simple and compact structure, small prism thickness, small volume, light weight and high optical imaging quality.

A supporting element includes a light-shielding portion and a supporting portion connected to the light-shielding portion. The light-shielding portion has a first surface, a second surface, a first inner-side connecting surface, and a first outer-side connecting surface. The first inner-side connecting and outer-side connecting surfaces connect the first and second surfaces, and face toward the inside and outside of the supporting element respectively. The first surface and the second surface are curved surfaces, and the first inner-side connecting surface further includes a first light-shielding surface adjacent to the first surface. The supporting portion has a third surface, a fourth surface, a second inner-side connecting surface, and a second outer-side connecting surface. The second inner-side connecting surface and the second outer-side connecting surface connect the third and the fourth surfaces, and face toward the inside and outside of the supporting element respectively. Furthermore, a portable optical imaging lens is also provided.

A lens including a filter, an aperture stop, and a lens set sequentially arranged along a first direction is provided. The filter includes a central region and a peripheral region. The central region has a first light transmission band for a wavelength range of a visible light and a second light transmission band for a wavelength range of an infrared light. The peripheral region surrounds the central region. The peripheral region has a third light transmission band for the wavelength range of the infrared light and is substantially opaque to the visible light, and an area of one portion of the central region surrounded by the peripheral region is tapered toward the first direction.