Abstract: A multi-fiber light guide includes: light guiding fibers, each fiber including an elongated glass core; a glass cladding, the cores being surrounded by the cladding to form a rigid and continuous glass element, the cores having a higher refractive index than the cladding such that light can be guided by a total reflection along the cores, which end in two abutting faces of the glass element such that light can be guided along the cores from one abutting face to the other abutting face; and an ion exchange layer at each of the abutting faces, the glass of the cores and the glass of the cladding including alkali ions, which are at least partly exchanged by alkali ions of a higher atomic number within the ion exchange layer at the abutting faces, the exchanged alkali ions within the ion exchange layer imparting a compressive stress at the abutting faces.

Abstract: A composite element includes: an outer holder; and an inner component which is held in the outer holder under a compressive stress, the outer holder and the inner component adjoining one another along a contour line which is closed, the contour line including two linear portions and two connecting portions, the two linear portions opposing one another and extending in a straight line, the two connecting portions connecting the two linear portions to form the contour line as closed, at least one of the two connecting portions having an arcuately extending curved region.

Abstract: An electronic device is provided which can be worn on the body or implanted into the body, such as in the form of a pulse watch and/or a smartwatch and/or an implant. The electronic device includes a photoplethysmographic measuring device. A transmitter diode and a receiver diode are arranged under a window made of glass or glass ceramics. The window is implemented as a compression glass seal and/or as a fiber-optic plate.

Abstract: The disclosure relates to a glass-metal feedthrough, composed of an outer conductor or a basic body, a glass material or glass-ceramic material, and an inner conductor. The inner conductor is preferably a metal pin and the inner conductor is sealed in the outer conductor, in particular basic body, in the glass or glass-ceramic material. The metal pin comprises a material with high conductivity and/or low contact resistance, as well as a sleeve element that surrounds the metal pin at least partially.

Abstract: A multi-fiber light guide includes: light guiding fibers, each fiber including an elongated glass core; a glass cladding, the cores being surrounded by the cladding to form a rigid and continuous glass element, the cores having a higher refractive index than the cladding such that light can be guided by a total reflection along the cores, which end in two abutting faces of the glass element such that light can be guided along the cores from one abutting face to the other abutting face; and an ion exchange layer at each of the abutting faces, the glass of the cores and the glass of the cladding including alkali ions, which are at least partly exchanged by alkali ions of a higher atomic number within the ion exchange layer at the abutting faces, the exchanged alkali ions within the ion exchange layer imparting a compressive stress at the abutting faces.

Abstract: An electrical feedthrough includes a base body having a first side and an opposed second side and at least one through-hole extending through the base body from the first side to the second side, an insulating material received in the through-hole, the insulating material having a first surface on the first side of the base body and an opposed second surface on the second side of the base body, and an electrical conductor extending through the insulating material, the electrical conductor having a first diameter at the location of the first surface of the insulating material and a second diameter at the location of the second surface of the insulating material, wherein the first diameter of the electrical conductor is larger than the second diameter of the electrical conductor.

Abstract: An electronic device is provided which can be worn on the body or implanted into the body, such as in the form of a pulse watch and/or a smartwatch and/or an implant. The electronic device includes a photoplethysmographic measuring device. A transmitter diode and a receiver diode are arranged under a window made of glass or glass ceramics. The window is implemented as a compression glass seal and/or as a fiber-optic plate.

Abstract: An electronic device is provided which can be worn on the body or implanted into the body, such as in the form of a pulse watch and/or a smartwatch and/or an implant. The electronic device includes a photoplethysmographic measuring device. A transmitter diode and a receiver diode are arranged under a window made of glass or glass ceramics. The window is implemented as a compression glass seal and/or as a fiber-optic plate.

Abstract: An electronic device is provided which can be worn on the body or implanted into the body, such as in the form of a pulse watch and/or a smartwatch and/or an implant. The electronic device includes a photoplethysmographic measuring device. A transmitter diode and a receiver diode are arranged under a window made of glass or glass ceramics. The window is implemented as a compression glass seal and/or as a fiber-optic plate.

Abstract: An electronic device that can be worn on the body or introduced into the body includes: a casing having a top and a bottom and an inorganic support including an opening and composed of a plurality of components; and at least one window made of at least one of glass or glass ceramic provided on the bottom. The window is secured in the inorganic support and seals the opening in the inorganic support.

Abstract: The disclosure relates to a glass-metal feedthrough, composed of an outer conductor or a basic body, a glass material or glass-ceramic material, and an inner conductor. The inner conductor is preferably a metal pin and the inner conductor is sealed in the outer conductor, in particular basic body, in the glass or glass-ceramic material. The metal pin comprises a material with high conductivity and/or low contact resistance, as well as a sleeve element that surrounds the metal pin at least partially.