A component for a projection exposure apparatus includes a printed circuit board arranged in an encapsulated housing and having electronic component parts, and a heat conducting structure for dissipating heat from the electronic component parts to an outer side of the housing.

A color eye-mounted display typically contains different color light emitters, with red, green and blue being the most common color combination. In one approach, the resolution of the red, green and blue components is not the same. For example, there may be more individually addressable red or green subpixels than blue subpixels. In hardware, this may be implemented by using fewer blue light emitters. Alternately, there may be equal numbers of red, green and blue light emitters, but the blue light emitters are not individually addressable and are grouped together to form larger blue subpixels. For example, three or more blue light emitters may form one addressable blue subpixel.

A beam expander apparatus includes a parabolic primary mirror that has a continuous surface. The continuous surface is configured to reflect, at least twice, a light beam. The parabolic primary mirror is further configured to deliver the light beam, in an expanded form, to a target object. The apparatus also includes a parabolic secondary mirror arranged with an orientation relative to the parabolic primary mirror. The parabolic secondary mirror has a continuous surface configured to reflect, at least twice, the light beam. The parabolic secondary mirror is further configured to receive the light beam via a port of the parabolic primary mirror.

A contact lens contains an inward pointing camera, which will be referred to as a retinal camera since it images light reflected from the retina. These can be reflections of physical features of the retina, of images of an external scene imaged by the eye onto the retina, or images projected onto the retina for example from small projectors contained in the contact lens (femtoprojectors). The field of view (FOV) of the retinal camera is sufficiently large that these reflections can be tracked relative to each other and/or relative to their position within the retinal camera's FOV. This information can be processed to track eye gaze and movement relative to the outside world, to align images from the femtoprojector with the eye and/or to align images from the femtoprojector with images from the outside world, among other tasks.

There is provided a display apparatus. The display apparatus includes an electronic display. The display apparatus includes first and second parabolic reflectors coupled together and facing each other. Each reflector has a vertex. The first parabolic reflector has an opening extending therethrough adjacent to the vertex thereof. The second parabolic reflector receives the electronic display adjacent to the vertex thereof.

A color eye-mounted display typically contains different color light emitters, with red, green and blue being the most common color combination. In one approach, the resolution of the red, green and blue components is not the same. For example, there may be more individually addressable red or green subpixels than blue subpixels. In hardware, this may be implemented by using fewer blue light emitters. Alternately, there may be equal numbers of red, green and blue light emitters, but the blue light emitters are not individually addressable and are grouped together to form larger blue subpixels. For example, three or more blue light emitters may form one addressable blue subpixel.

A variety of femtoprojector optical systems are described. Each of them can be made small enough to fit in a contact lens using plastic injection molding, diamond turning, photolithography and etching, or other techniques. Most, but not all, of the systems include a solid cylindrical transparent substrate with a curved primary mirror formed on one end and a secondary mirror formed on the other end. Any of the designs may use light blocking, light-redirecting, absorbing coatings or other types of baffle structures as needed to reduce stray light.

A variety of femtoprojector optical systems are described. Each of them can be made small enough to fit in a contact lens using plastic injection molding, diamond turning, photolithography and etching, or other techniques. Most, but not all, of the systems include a solid cylindrical transparent substrate with a curved primary mirror formed on one end and a secondary mirror formed on the other end. Any of the designs may use light blocking, light-redirecting, absorbing coatings or other types of baffle structures as needed to reduce stray light.

The present invention relates to a reflective optical objective (1) comprising: a first reflecting element (3) including a front surface (3a) and a hack surface (3b), the front surface (3a) including a convex reflecting surface (11); and a second reflecting element (5) including a concave reflecting surface (13) facing the convex reflecting surface (11) of the first reflecting element (3), the second reflecting element (5) including a transmissive section (7) permitting electromagnetic radiation to pass through the concave reflecting surface (13) of the second reflecting element (5) to the first reflecting element (3). The reflective optical objective (1) is characterized in that the reflective optical objective (1) includes a carrier material (9) embedding at least the front surface (3a) of the first reflecting element (3) and defining the distance (d) between the first (3) and second (5) reflecting elements.

A mirror system is disclosed. The mirror system can include a primary mirror, and a secondary mirror supported relative to the primary mirror. The primary mirror and the secondary mirror can have different coefficients of thermal expansion (CTE). A negative CTE strut is also disclosed. The negative CTE strut can include a main body portion. The negative CTE strut can also include 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 be configured to interface with an external structure. In addition, 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 end can be between the first coupling portion and the second end. 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.