A case, for an electronic device such as a mobile phone, containing an insert located near a camera, still image recorder, or video recorder and a flash of the device is disclosed. The placement, material, color and properties of the insert helps reduce and/or eliminate problems associated with the case affecting the resultant flash/light from the camera, causing and adding erroneous colors, effects, and information on the resulting pictures, images, sensors, or videos.

Beam guiding devices for guiding a laser beam, in particular in a direction towards a target region for producing extreme ultraviolet (EUV) radiation, include an adjustment device for adjusting a beam diameter and an aperture angle of the laser beam. The adjustment device includes a first mirror having a first curved reflecting surface, a second mirror having a second curved reflecting surface, a third mirror having a third curved reflecting surface, a fourth mirror having a fourth curved reflecting surface, and a movement device configured to adjust the beam diameter and the aperture angle of the laser beam by moving the first reflecting surface and the fourth reflecting surface relative to one another and, independently thereof, moving the second reflecting surface and the third reflecting surface together relative to the first reflecting surface and the fourth reflecting surface.

An illumination optical system having a light source and a single convex lens with a diffractive structure, wherein the phase function of the diffractive structure is represented by $\varphi \left(r\right)=\underset{i=1}{\overset{N}{.Math.}}{\beta }_{2i}{r}^{2i}$
where r represents distance from the central axis of the lens, the relationship
|β.sub.2|.Math.(0.3R).sup.2<|β.sub.4|.Math.(0.3R).sup.4
is satisfied where R represents effective radius of the lens, the second derivative of the phase function has at least one extreme value and at least one point of inflection where r is greater than 30% of R, and the area of a surface of the light source is equal to or greater than 3% of the area of the entrance pupil when the light source side of the lens is defined as the image side.

An optical device includes a clamp seat and a light tuning assembly. The clamp seat includes a base, a curved potion extending from the base, and a pressing portion extending from the curved portion. The light tuning assembly includes a support frame disposed at the base, an optical lens restrained by the support frame, and an adjusting member coordinating with the optical lens. In an application of the optical device, a user may clamp a multimedia mobile communication device by the base and the pressing portion to allow the optical lens to align with a light projecting assembly of the multimedia mobile communication device. The adjusting member is rotated to adjust a distance between the optical lens and the light projecting assembly. Light from the light projecting assembly is then focused or dispersed through the optical lens to solve an issue of unadjustable light of a conventional solution.

The invention provides an optical path adjusting unit and a display device. The optical path adjusting unit, for adjusting light rays from different directions to transmit in approximately the same direction, comprises a light converging part, a reflective part and a light scattering part. The light converging part and the light scattering part form a hollow space, and the reflective part is disposed within the hollow space and connected to the middle of the light converging part and the middle of the light scattering part to divide the hollow space into two parts. The light converging part is used to converge the light rays from different directions; the reflective part is used to reflect the converged light rays onto the light scattering part, and the light scattering part is used to transmit the light rays reflected thereon by the reflective part out in approximately the same direction.

An image display apparatus according to one embodiment of the present disclosure includes: an output unit including a light source and outputting projection light outputted from the light source along a predetermined axis; an irradiation target member to be irradiated with the projection light; a first optical member disposed opposite to the output unit along the predetermined axis and controlling an incident angle of the projection light to be incident on the irradiation target member; and a second optical member included in the output unit and adjusting an illumination range of the projection light to be incident on the first optical member such that the illumination range has an aspect ratio of substantially the same as an aspect ratio of an outer shape of the first optical member.

A laser system may include a laser resonator configured to emit an input laser beam having an elliptical cross-sectional shape. The laser system also may include first reflective device configured to reflect the input laser beam to produce a first reflected laser beam. The first reflective device may include a spherical surface for reflecting the input laser beam. The laser system also may include a second reflective device configured to reflect the first reflected laser beam to produce a second reflected laser beam. The laser system also may include a coupling device configured to focus the second reflected laser beam to produce an output laser beam. The coupling device may include a spherical surface for receiving the second reflected laser beam. The laser system also may include an optic fiber configured to transmit the output laser beam for emission of the output laser beam onto a target area.

A device is provided for setting a focus position (z) of a laser beam in a laser machining system. The device comprises a computing unit configured to calculate a time-dependent value z.sub.t of the focus position (z), wherein the computing unit calculates the time-dependent value z.sub.t of the focus position (z) based on a first parameter and a second parameter, wherein the first parameter indicates a magnitude A of a laser-power dependent focus shift per power unit and the second parameter indicates a time constant τ of a change in focus position due to a thermal lens by a factor of 1/e, and a control unit configured to use a mechanism for setting the focus position (z) to set the focus position (z) of the laser beam based on the time-dependent value z.sub.t of the focus position (z).

In certain embodiments, an ophthalmic laser system comprises a laser source, multi-focal optics, scanners, delivery optics, and a computer. The laser source generates a laser beam of ultrashort laser pulses. The multi-focal optics multiplex the laser beam to yield focus spots in a target along a propagation axis of the laser beam. The scanners direct the laser beam in x, y, and z directions. The delivery optics focus the laser beam within the target to form the focus spots in the target along the propagation axis of the laser beam. The computer instructs the scanners and the delivery optics to direct and to focus the focus spots at the target according to a scan pattern.

A light source module and a method for manufacturing the same, and a backlight module and a display device using the same are provided. The method includes the following steps. A reference light source module is provided. The reference light source module comprises a substrate and plural light-emitting units arranged on the substrate. Then, plural optical trends between every two adjacent light-emitting units are obtained. Then, plural optical ratios between every two adjacent light-emitting units are calculated, in which each of the optical ratios is a ratio of each of the optical trends to a total reference optical trend of the reference light source module. Then, plural target distances are calculated according to the optical ratios and plural initial distances between every two adjacent light-emitting units are adjusted according to the target distances, thereby forming a target light source module.