A device for altering vergence of light to improve human vision of an electronic display. The change in vergence is received at the pupil of the wearer. The altered light effectively recreates the rays emitted by a pixel such that they reach a presbyopic eye as though they were being viewed at a distance (i.e., the rays are substantially parallel). As such, the emmetropic presbyopic eye produces a sharp image of the electronic display. The device comprises: a refractive element that refracts rays, emitted from a pixel of an electronic display, at a predetermined vergence, wherein the refractive element is located directly adjacent or on the electronic display.

A variety of femtoprojector optical systems are described. The optical bodies for the systems may be made in batches by wafer-level optics. Each individual system may be made small enough to fit in a contact lens. In some designs, the optical systems include a solid transparent body with a curved primary mirror, a secondary mirror, an entrance window, an exit window, and at least one groove. The grooves function as a light trap that reduces the amount of stray light exiting the body of the optical system. The grooves may also create a snap point which allows removal of individual bodies from the wafer through controlled breakage. The designs may also include various light blocking, light-redirecting, absorbing coatings, or other types structures to reduce stray light.

A telescope including a fastener plate, a primary mirror carried by a front face of the plate, and a secondary mirror held facing the primary mirror by a support. The telescope is of the Cassegrain type and the plate has a rear surface including positioning references for positioning the telescope relative to an image capture device arranged facing the rear face.

An eye-mounted device includes a contact lens and an embedded imaging system. The front aperture of the imaging system faces away from the user's eye so that the image sensor in the imaging system detects imagery of a user's external environment. The optics for the imaging system has a folded optical path, which is advantageous for fitting the imaging system into the limited space within the contact lens. In one design, the optics for the imaging system is based on a two mirror design, with a concave mirror followed by a convex mirror.

An object of the present invention is to provide an objective optical system and a photoacoustic imaging apparatus capable of obtaining a clearer image of a sample than before. The objective optical system (23) includes: a convex mirror (101) having a convex reflecting surface for reflecting pulsed light traveling toward a sample (SP); a concave mirror (102) having a concave reflecting surface for reflecting the light reflected by the convex mirror (101) and irradiating the sample (SP) with the light; and an ultrasonic detector (103) having at least one end portion provided on an object side of the convex mirror (101), and detecting an acoustic wave obtained by irradiating the sample (SP) with the light.

An optical laser beam director assembly is disclosed. The beam director assembly includes a monolithic optics piece formed of transparent optical material, a laser source is coupled to the monolithic optics piece to provide a laser beam to the optics piece, and a beam steerer connected to the optics piece to direct the laser beam output from the optics piece onto a target.

This Cassegrain reflector 200 is provided with a primary mirror 201 and a secondary mirror 202 disposed coaxially with the primary mirror 201 and laterally supported by a plurality of supporting rods. The Cassegrain reflector 200 causes the light incident through an opening 212 formed along an axial line L of the primary mirror 201 to be reflected onto the secondary mirror 202, and then causes the light to be reflected onto the primary mirror 201 in order to emit the light toward a measurement position through an opening 231 formed on the side of the secondary mirror 202. A Cassegrain reflector retention mechanism 6 for retaining the Cassegrain reflector 200 is provided with a retainer 61 for retaining the Cassegrain reflector 200, and a rotation adjustment mechanism 60 for adjusting the rotational position of the plurality of supporting rods.

A pair of electronic eyeglasses includes an eyeglasses frame and an eyeglasses lens mounted within the eyeglasses frame. At least one femtoprojector is embedded within the eyeglasses lens. The femtoprojector includes an image source and an optical system that projects an image from the image source onto the retina of the wearer. The femtoprojector is small enough that is does not significantly interfere with the wearer's view through the eyeglasses lens.

A mirror system including a primary mirror, and a secondary mirror with different coefficients of thermal expansion. A negative CTE strut can include a main body portion, a first coupling portion and a second coupling portion disposed opposite one another about the main body portion and defining a strut length. The first and second coupling portions can each interface with an external structure. The negative CTE strut can include an offsetting extension member having a first end coupled to the main body portion and a second end coupled to the first coupling portion by an intermediate extension member. The first and second ends can define an offset length parallel to the strut length. When the negative CTE strut increases in temperature, the offset length can be configured to increase due to thermal expansion of the offsetting extension member sufficient to cause the strut length to decrease.

A catoptric system having a reference axis and first, second, and third reflectors. The first reflector contains a pattern-source carrying a substantially one-dimensional pattern. A combination of the second and third reflectors is configured to form an optical image of the pattern, with a demagnification coefficient N>1 in extreme UV light, and with only two beams of light that have originated at the first reflector as a result of irradiation of the first reflector with light incident upon it. An exposure apparatus employing the catoptric system and method of device manufacturing with the use of the exposure apparatus.