Abstract: A wearable device, such as a wearable ring device, configured to transition between multiple discrete ring sizes is described. For example, the wearable ring device may include multiple rings coupled to one another (e.g., adjacent, parallel, or concentric rings), where a user may manipulate or adjust the rings relative to one another to transition between multiple discrete ring sizes. In some cases, the multiple rings may be oval or elliptical-shaped, where rotating the rings relative to one another may change the size of the ring. In some other cases, the multiple rings may be threaded such that they may be screwed into and out of one another. In some other cases, the wearable ring device may include a long housing that may coil into itself to form multiple concentric loops, where coiling or uncoiling the concentric loops adjusts the ring size.

Abstract: A wearable device, such as a wearable ring device, configured to transition between multiple discrete ring sizes is described. For example, the wearable ring device may have an adjustable inner circumference and a rigid outer housing. The inner circumference may be adjusted to transition between multiple discrete ring sizes. For example, a wearable ring device may include a ring housing that exhibits a constant outer circumference, where mechanical components of the ring are configured to adjust at least a portion of an inner circumferential surface to transition the ring between the discrete sizes. The ability of the wearable device to transition between multiple discrete sizes may enable the wearable device to achieve a better fit on a user, thereby improving contact between one or more sensors of the wearable device and the skin of the user, leading to more accurate physiological data readings.

Abstract: A wearable device, such as a wearable ring device, configured to transition between multiple discrete ring sizes is disclosed. The wearable ring device may include a discontinuous ring-shaped housing that extends radially around at least a portion of a circumference of the wearable ring device, where a first end and a second end of the discontinuous ring-shaped housing are separated from one another by a radial distance and configured to move relative to one another. The wearable ring device may further include one or more sensors positioned at least partially within an inner circumferential surface of the discontinuous ring-shaped housing, and one or more mechanical components configured to transition the wearable ring device between the multiple discrete ring sizes.

Abstract: Systems and devices for optimized structures for optical measurement are described. A wearable device may include a housing configured to house one or more sensors to acquire physiological data from a user. The wearable device may further include one or more light sources disposed on a surface of the housing and positioned to direct light into a tissue surface of the user and one or more detectors disposed on the surface of the housing and positioned to receive light from the one or more light sources along a plurality of optical paths where a first optical path may be through the tissue surface and a second optical path may be directly from the one or more light sources. The wearable device may include one or more light blocking components disposed on a surface of the housing that are configured to block stray light along the second optical path.

Abstract: A wearable electronic device includes a body part made of a non-ceramic material, having an inner surface and an outer surface, wherein at least one cavity having a depth is arranged on the inner surface of the body part, an electronic part arranged in the at least one cavity, which electronic part has a thickness that is less than the depth of the at least one cavity, and a coating made of a moldable filler material on the inner surface of the body part, covering the electronic part and the at least one cavity.

Abstract: A wearable electronic device includes a body part made of a non-ceramic material, having an inner surface and an outer surface, wherein at least one cavity having a depth is arranged on the inner surface of the body part, an electronic part arranged in the at least one cavity, which electronic part has a thickness that is less than the depth of the at least one cavity, and a coating made of a moldable filler material on the inner surface of the body part, covering the electronic part and the at least one cavity.

Abstract: A wearable electronic device including a molded body part made of a moldable ceramic material, having an inner surface, an outer surface, and at least one cavity having a depth arranged on the inner surface of the body part, an electronic part arranged in the cavity, which electronic part has a thickness that is less than the depth of the cavity, and a coating made of an epoxy material on the inner surface of the body part, covering the electronic part and the cavity.

Abstract: A wearable electronic device including a molded body part made of a moldable ceramic material, having an inner surface, an outer surface, and at least one cavity having a depth arranged on the inner surface of the body part, an electronic part arranged in the cavity, which electronic part has a thickness that is less than the depth of the cavity, and a coating made of an epoxy material on the inner surface of the body part, covering the electronic part and the cavity.