180 results about "Achromatic lens" patented technology

An element-specific imaging technique utilizes the element-specific fluorescence X-rays that are induced by primary ionizing radiation. The fluorescence X-rays from an element of interest are then preferentially imaged onto a detector using an optical train. The preferential imaging of the optical train is achieved using a chromatic lens in a suitably configured imaging system. A zone plate is an example of such a chromatic lens; its focal length is inversely proportional to the X-ray wavelength. Enhancement of preferential imaging of a given element in the test sample can be obtained if the zone plate lens itself is made of a compound containing substantially the same element. For example, when imaging copper using the Cu La spectral line, a copper zone plate lens is used. This enhances the preferential imaging of the zone plate lens because its diffraction efficiency (percent of incident energy diffracted into the focus) changes rapidly near an absorption line and can be made to peak at the X-ray fluorescence line of the element from which it is fabricated. In another embodiment, a spectral filter, such as a multilayer optic or crystal, is used in the optical train to achieve preferential imaging in a fluorescence microscope employing either a chromatic or an achromatic lens.

An improved illuminator with an adjustable beam pattern to be worn by medical and dental professionals includes a housing, a light-emitting diode (LED) disposed in the housing outputting light through a distal opening in the housing, an achromatic doublet lens mounted in the opening in the housing, and a singlet lens disposed between the LED and the achromatic lens. The distance between the singlet lens and the doublet lens may be adjustable, and / or distance between the LED and the singlet lens may be adjustable, through a threaded connections, for example. In the preferred embodiment, the achromatic doublet lens, the singlet lens, or both the singlet and the doublet lens have a planar surface.

A lens assembly for an optical imaging lens is disclosed, which includes a first lens, wherein the first lens has a negative power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the sixth lens has a positive power, wherein the second lens and the third lens define a first cemented achromatic lens assembly, and the fourth lens and the fifth lens define a second cemented achromatic lens assembly, wherein the first lens, the first cemented achromatic lens assembly, the second cemented achromatic lens assembly and the sixth lens are orderly arranged along the direction from the object side to the image side.

An improved illuminator with an adjustable beam pattern to be worn by medical and dental professionals includes a housing, a light-emitting diode (LED) disposed in the housing outputting light through a distal opening in the housing, an achromatic doublet lens mounted in the opening in the housing, and a singlet lens disposed between the LED and the achromatic lens. The distance between the singlet lens and the doublet lens may be adjustable, and / or distance between the LED and the singlet lens may be adjustable, through a threaded connections, for example.

A wideband, e.g., 550 nm to 940 nm, apochromatic lens system for use with an external aperture stop, includes first, second, and third optical groups having, in order, positive, negative, and positive powers. The first group includes four optical elements having, in order, negative, positive, negative, and positive powers. The second group includes one element of negative power; and the third group includes two elements each having positive power. In another embodiment for use with an internal stop, the system includes first, second, and third optical groups having, in order, positive, positive, and negative powers. The first group includes four optical elements having, in order, positive, negative, positive, and negative powers. The second group includes one element of positive power, and the third group includes one element of negative power. In either embodiment, all of the optical elements are formed from not more than three different types of glass material.

The present invention is intended, as an object thereof, to improve stability against both temperature changes and light source output changes, and includes an achromatic lens having a composite structure of glass or a plastic lens having a diffraction grating counteracting a focal length change due to a wavelength change of light, where a lens holder is adhered to an opposite side to a light source of an overhang of the achromatic lens made of glass while the lens holder is adhered to a light source side of the overhang of the plastic lens with the diffraction grating.

An optical lens comprises: a first lens having a negative focal power; a second lens; a third lens; a fourth lens; a fifth lens, wherein the fourth lens and the fifth lens forms an achromatic lens group; and a sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially disposed along a direction from an object side to an image side, wherein the first lens has at least one object surface facing the object side, and the object surface of the first lens is convex, and wherein the second lens has at least one image surface facing the image side, and the image surface of the second lens is convex so as to facilitate forming a concentric circle structure.

The invention discloses a dual-mode digital holographic microscope. The dual-mode digital holographic microscope comprises a light source, a beam expansion collimation system, a first cubic beam splitter, a first baffle board, a first plane reflector, a first microscope objective lens, a second cubic beam splitter, a second microscope objective lens, a second plane reflector, a second baffle board, a third plane reflector, an achromatic lens, a third cubic beam splitter and an imaging device. A light beam emitted by the light source passes through the beam expansion collimation system and is then divided into transmission and reflection beams by the first cubic beam splitter. Through controlling the first baffle board and the second baffle board, the light beam propagation path is controlled, and switching between reflective and transmissive measurement modes can be realized. The dual-mode digital holographic microscope is advantaged in that the dual-mode digital holographic microscopecan be used not only for three-dimensional microscopic imaging of transparent samples, but also for three-dimensional microscopic imaging of reflective sample surfaces, convenient test and the compact structure are realized, and the dual-mode digital holographic microscope can be more widely applied to the practical engineering measurement field.

The invention provides an optical imaging lens. The optical lens comprises first, second, third, fourth and fifth lens bodies, wherein the focal power of the first lens body is negative; the focal power of the second lens body is positive; the third and fourth lens bodies form an achromatic lens group; and the focal power of the fifth lens body is positive, and the fifth lens body includes at least one aspheric surface.

The invention discloses a reverse spatial deflection Raman spectrum detection device. The device is characterized by comprising a laser device, laser device coupling optical fiber, a collimator, a bypass filter lens, an telescopic sleeve, a conical lens, a dichroscope, a double-glued achromatic lens pair, a long-wave filtering lens, a trapped-wave filtering lens, a spectrum collection optical fiber, a back-illuminated in-depth refrigerating electron-multiplying CCD camera, a spectrograph and a computer. The invention further provides a reverse spatial deflection Raman spectrum detection method. Compared with the prior art, the device has the advantages that the conical lens is used to form an annular light spot to irradiate a to-be-detected sample, and Raman signals are collected at the circle center of a ring and then transmitted to the spectrograph for spectrum analysis to realize noncontact detection of the to-be-detected sample to generate in-depth ingredient Raman spectrum information.

In a zoom lens comprising first to fourth lens groups, the second lens group comprises two meniscus lenses and an achromatic lens. The achromatic lens comprises a cemented lens having a negative refracting power as a whole, and a lens having a positive refracting power with a convex surface directed onto the object side. The cemented lens comprises a meniscus lens or plane-convex lens having a positive refracting power with a concave surface or plane directed onto the object side, and a lens having a negative refracting power.

An optical system of a stereo video endoscope with lateral viewing direction. The optical system including: a sideways looking distal optical assembly; and a proximal optical assembly. Where the distal optical assembly includes, successively in a direction of light incidence on a common optical axis: an entrance lens configured as a raised negative meniscus, an optical deflection unit; and an exit lens configured as a hollow positive meniscus, Where the distal optical assembly has, at least in sections, a right and a left lens system channel of identical type and arranged parallel to one another, each of the right and left lens system channel having: a dedicated optical axis, and at least one first lens and an achromatic lens group in the direction of light incidence.

The invention discloses a broad spectrum optical fiber collimator. The broad spectrum optical fiber collimator comprises a thermal-expanding core optical fiber head, an achromatic lens and an outer sleeve, wherein the thermal-expanding core optical fiber head and the achromatic lens are arranged in the outer sleeve in a straight line, and an air layer is arranged between the thermal-expanding core optical fiber head and the achromatic lens, the thermal-expanding core optical fiber head and the achromatic lens have the same optical axis, and the outer sleeve is provided with a fixed central axis; the broad spectrum optical fiber collimator has the characteristics that a rear end face of the achromatic lens is vertical to the outer sleeve, the distance between the rear end face of the achromatic lens and a front end face of the thermal-expanding core optical fiber head is the thickness of the air layer in the middle, and is equal to the difference of an effective focus length of the achromatic lens and the distance between the rear end face of the achromatic lens and a primary side of the achromatic lens. Compared with the traditional collimator, the broad spectrum optical fiber collimator provided by the invention greatly reduces the insertion loss of an incident light beam; the core diameter of the thermal-expanding core optical fiber head is magnified by 3-5 times; an emergent light beam has a large spot diameter, and a small emergent aperture angle; and the chromatic dispersion caused by the broad spectrum is eliminated, the system transmission performance is improved, and the alignment error is low.