1582 results about "Illumination angle" patented technology

The present invention relates to systems and methods for quantitative three-dimensional mapping of refractive index in living or non-living cells, tissues, or organisms using a phase-shifting laser interferometric microscope with variable illumination angle. A preferred embodiment provides tomographic imaging of cells and multicellular organisms, and time-dependent changes in cell structure and the quantitative characterization of specimen-induced aberrations in high-resolution microscopy with multiple applications in tissue light scattering.

A projection exposure device, in particular for micro-lithography, serves to produce an image of an object in an image plane positioned in an object plane. This happens with the aid of a light source emitting projection light and illumination optics positioned in the ray path between the light source and the object plane. In addition projection optics positioned in the ray path between the object plane and the image plane serve to guide the projection light. A filter (7) is positioned in a filter plane which lies in the vicinity of a pupil plane between the light source and the object plane. This has a moveable filter element (22') which has at least in certain areas (24) for the projection light a transmission factor which is greater than zero and less than 100%. The moveable filter element (22') is moveable in the filter plane and has a distribution of the transmission factor over the filter face, in such a way that the intensity distribution of the projection light perpendicular to the optical axis (14) in the ray path after the filter (7) changes with the movement of the filter element (22'). With such a filter (7) an illumination angle distribution can be adapted to a pre-set value (FIG. 5).

An LED lamp includes a housing, an LED module received in the housing and a lamp holder engaging the housing to position the LED lamp to a panel. The housing includes a base and a plurality of fins integrally extending from the base. The base defines a receiving recession in a bottom thereof, receiving the LED module therein. The lamp holder is connected to the base of the housing via fasteners extending through the lamp holder and inserting in the base of the housing. An illumination angle of the LED lamp is adjustable within the lamp holder via rotation of the housing about the fasteners.

An optical inspection system uses an illumination gradient to gradually spatially vary the intensity and/or specular characteristics of the illumination reflected from the surface of a specular object to determine surface gradients of the object. The surface gradients can be used to reconstruct a three-dimensional image of the object. The illumination gradient can be produced by an illumination apparatus that includes circular arrays of light-emitting elements. The illumination gradient can also be produced using an optical element that gradually alters the illumination intensity of the reflected illumination in accordance with the incidence characteristics of the reflected illumination on the optical element. The illumination gradient enables the use of numerous illumination angles to reduce error in estimated surface gradients without increasing imaging or processing time.

A refraction-type LED ceiling lamp, especially a plate-type ceiling lamp which is used on an indoor ceiling, includes primarily a fiber light guide plate, a reflection surface of which is provided with multiple chip-shape reflection elements, distributed in arrays. A chip size of the reflection elements decreases gradually toward an entrance surface by a geometric series; whereas, a gap between the reflection elements increases gradually. A reflection curve of the reflection element allows light to be projected out uniformly and a required illumination angle to be achieved.

An opaque article having a surface and substantially asymmetric striae extending along the surface. A portion of the striae reside in a first area and have an orientation. Another portion of the striae reside in a second area and have an orientation substantially opposite the striae in the first area. The first area striae and the second area striae create an optical contrast therebetween at a wide range of viewing angles and illumination angles. The opaque article can be a tire. The striae can reside at numerous locations on the tire, including, for example, the sidewall, tread ribs or blocks, and stone ejectors.

A power tool has a light unit provided at the bottom part of the handle grip. The light unit can be adjusted to change the lighting angle and can hold the desired lighting angle. The light unit thus disposed does not get in the way, the lighting angle of the light unit is variable and the emitted light does not shake, depletion of the power supply due to the light switch of the light unit being left on is prevented, shadows of the end tool are not easily produced by light from the light unit, lighting contrast is high, wiring failures and continuity faults in the light-emitting element do not occur easily, and a small, economical power tool can be provided. The light-emitting element of the light unit is a yellow LED. The light unit turns off automatically at a predetermined time after the light turns on.

Methods and apparatus for pupil detection are described. First light is emitted from a first light source at a first illumination angle relative to the axis of a detector. Second light is emitted from a second light source at a second illumination angle relative to the axis. The first light and the second light can have substantially equal intensities. The second illumination angle is greater than the first illumination angle. Reflected first light and reflected second light are received at the detector. The difference between the reflected first light and the reflected second light can be determined. The difference can be used to detect the pupils of a subject's eyes.

An exemplary LED lamp module includes an LED lamp, a fixed base, and a plurality of elastic member. The LED lamp includes a base and an LED module. The base includes a plurality of connecting portions, and the fixed base includes a plate and a plurality of fixed poles corresponding to the connecting portions so as to form a space therebetween for accommodating the LED lamp. Each of the fixed poles includes a plurality of locating grooves. One end of each of the elastic member is connected to the connecting portions of the base, and the other end of each of the elastic member is adjustably fixed to the locating grooves of the fixed poles. The illuminating angle of the LED module may be conveniently adjusted according to different height of the lamp post and the different of the angles between the LED lamp modules relative to the ground.

A forensic microscope, particularly for examination of writing, comprising a single-channel microscope with stereo viewing by synchronized interchange of the illumination angle in front of the microscope objective and/or of the angle of observation following the microscope objective and, further, by fluorescence excitation in a range of approximately 340 to 360 nm and/or between 400 nm and approximately 590 nm.

A variable illumination angle inspection system is provided, including a light source providing a light beam and a scanner imparting scanning deflection to the light beam to provide a scanning beam approaching a substrate at a first angle. A deflection element is selectively insertable into an optical path of the scanning beam to deflect the scanning beam so as to cause the scanning beam to approach the substrate at a second angle.

The invention discloses a multi-mode micro-imaging system and method based on an LED array. The LED array serves as a microscope system light source and generates controllable multi-angle illumination light and a controllable illumination pore diameter, and bright field imaging, dark field imaging and difference phase contrast imaging are achieved. The realizable multi-mode imaging includes the three imaging modes of bright field imaging, dark field imaging and difference phase contrast imaging, and while bright field imaging, dark field imaging and difference phase contrast imaging are achieved, it is unnecessary to add any additional optical elements into the imaging path of a traditional microscope; in this way, an optical system is greatly simplified, and the LED array enables the microscope to have the capacity of flexibly adjusting the illumination pore diameter, the illumination angle and light source coherence.

A characteristic of a surface is measured by illuminating the surface with optical radiation over a wide angle and receiving radiation reflected from the surface over an angle that depends on the extend of the illumination angle. An emissivity measurement is made for the surface, and, alternatively, if a reflectivity measurement is made, it becomes more accurate. One application is to measure the thickness of a layer or layers, either a layer made of transparent material or a metal layer. A one or multiple wavelength technique allow very precise measurements of layer thickness. Noise from ambient radiation is minimized by modulating the radiation source at a frequency where such noise is a minimum or non-existent. The measurements may be made during processing of the surface in order to allow precise control of processing semiconductor wafers, flat panel displays, or other articles. A principal application is in situ monitoring of film thickness reduction by chemical-mechanical-polishing (CMP).

Disclosed are systems and methods for modifying a reticle. In general, inspection results from a plurality of wafers or prediction results from a lithographic model are used to individually decrease the dose or any other optical property at specific locations of the reticle. In one embodiment, any suitable optical property of the reticle is modified by an optical beam, such as a femto-second laser, at specific locations on the reticle so as to widen the process window for such optical property. Examples of optical properties include dose, phase, illumination angle, and birefringence. Techniques for adjusting optical properties at specific locations on a reticle using an optical beam may be practiced for other purposes besides widening the process window.

A vehicle detection apparatus detects oncoming vehicles, and the illumination angle of the headlight is changed downwardly when oncoming vehicles are detected. When detecting the oncoming vehicles, the vehicle detection apparatus detects brightness or area for the every light source in an acquired image repeatedly, and detects as a variable light source any light source of which brightness or area changes within a reference time beyond a predetermined variation reference value. Then, when a variable light source is detected, it is determined that vehicles exist in the acquired image.

The invention aims to provide an adaptive bend auxiliary lighting method and an adaptive bend auxiliary lighting device. The method and the device make a head lamp of an automobile change the illumination angle in advance according to road conditions, so that a driver can previously make visual confirmation of the bend where the vehicle is about to enter to ensure the driving safety. The lighting device comprises a controller, the head lamp, a camera and an executing mechanism, wherein the camera is used for acquiring an image of a road in front of the vehicle; the executing mechanism is used for adjusting the illumination angle of the head lamp; the controller receives the image acquired by the camera and processes the image to obtain a lane line or road boundary; and the controller fits the road and calculates the radius of the bend and the distance from the vehicle to the starting position of the bend according to the lane line or the road boundary obtained by processing, calculates the illumination angle required by the head lamp according to the illuminating range requirement of the vehicle, the calculated radius of the bend and the distance from the vehicle to the starting position of the bend, and controls the executing mechanism to move and adjusts the illumination angle of the head lamp according to the angle.

An LED lamp assembly includes an LED lamp and a supporting member supporting the LED lamp. The LED lamp includes a plurality of LED modules and a heat sink supporting and cooling the LED modules. The supporting member includes a pair of supporting arms supporting the LED lamp and pivotably engaging with the heat sink of the LED lamp. The heat sink is rotatable relative to the supporting arms of the supporting member to vary an illumination angle of the LED lamp assembly.

An LED flood lamp includes an LED lamp and a primary bracket and an accessorial bracket. The lamp includes a pair of lateral sidewalls. The primary bracket pivotally connects with the lateral sidewalls. The accessorial bracket has one end pivotally connecting with one lateral sidewall, and another end connected to the primary bracket via a fastener. Each of the primary and accessorial brackets defines an elongated slot. The fastener is slidable along the slots of the primary and accessorial brackets to vary an illumination angle of the lamp. The LED lamp has a substrate, a plurality of LED modules mounted on a top surface of the substrate and a heat sink mounted on a bottom surface of the substrate, whereby heat generated by the LED modules can be transferred to the heat sink via the substrate to be dissipated to ambient air.