In one embodiment, a light guide includes an emitter and a light guide body optically coupled to the emitter. The light guide body may define a cylindrical body that tapers along an angled plane from a top end towards a bottom end. The bottom end may define a light entrance to the light guide body.

A key structure includes a casing, a covering member, a pressing element, a triggering post, a switch element. The casing has an opening. The opening is covered by the covering member. The pressing element is disposed within the opening and connected with the covering member. The pressing element includes a middle part and an extension part. The triggering post is installed on the middle part of the pressing element. The triggering post is extended in the direction toward the inner position of the casing. When an external force is applied to the middle part of the pressing element, the triggering post is moved toward the switch element to push the switch element. When the external force is applied to the extension part of the pressing element, the triggering post is correspondingly moved with the pressing element in an inclined manner to push the switch element.

In one embodiment, an oral irrigator includes a reservoir, a base configured to support the reservoir, and a button assembly coupled to the base. The button assembly may include a button, a spring coupled to the button, and a seal coupled to the spring. The button may be movable between an original position and an actuation position. The spring may be configured to deform in response to a user input force moving the button from the original position to the actuation position, and to resiliently return the button to the original position in response to cessation of the user input force on the button. The seal may inhibit fluid from entering through the spring into the base.

In one embodiment, an oral irrigator includes a reservoir, a base configured to support the reservoir, and a button assembly coupled to the base. The button assembly may include a button, a spring coupled to the button, and a seal coupled to the spring. The button may be movable between an original position and an actuation position. The spring may be configured to deform in response to a user input force moving the button from the original position to the actuation position, and to resiliently return the button to the original position in response to cessation of the user input force on the button. The seal may inhibit fluid from entering through the spring into the base.

Mechanical keypads are disclosed. According to one embodiment, a mechanical keypad may include a key cap comprising a post extending from a bottom surface thereof; a structural element comprising a passage configured to receive the post therethrough; and a key securing device that securely receives, through the passage, the post in a recess or opening formed therein, and comprising a key switch interface on a lower surface thereof. The key cap and the key securing device may move substantially in unison when the key post is securely received in the key securing device.

Embodiments are directed to a dome switch and methods related to the use thereto. In one aspect, an embodiment includes a key cap. The embodiment may further include a domed structure having upper and lower portions. The domed structure may be configured to deform in response to an input force received at the upper portion by the key cap. The embodiment may further include a collar affixed to the lower portion and extending toward the key cap. The collar may resist deformation of the domed surface.

[Object] To propose a new and improved button unit and electronic device, in which an attitude of a button of an electronic device can be made stabilize. [Solution] A button unit including: an operating member that presses a member to be pressed, in response to being press operated; and an urging member that urges the operating member against the member to be pressed. In this way, there can be provided the new and improved button unit and electronic device, in which the attitude of a button of an electronic device can be made stabilize

An input device includes: a key (8); and an elastic supporting member (11) supporting the key (8) in such a manner as to allow the key (8) to move in a pressing direction of the key (8), the elastic supporting member (11) including: a post section (12) protruding below a level of a bottom face of the key (8) from an edge (8a) of the key (8); and an elastic arm section (13) connected to a tip end of the post section (12) and extending along the edge (8a) of the key (8).

Embodiments are directed to a dome switch and methods related to the use thereto. In one aspect, an embodiment includes a key cap. The embodiment may further include a domed structure having upper and lower portions. The domed structure may be configured to deform in response to an input force received at the upper portion by the key cap. The embodiment may further include a collar affixed to the lower portion and extending toward the key cap. The collar may resist deformation of the domed surface.

An input device includes a housing which has an opening, button parts which are exposed from the opening and which are pressed down in a first direction, a support component which has a support part to support the button parts, a first surface to face the housing, a second surface provided opposite to the first surface, and fixation parts provided at a first distance from the support part and fixed to the housing on a side of the first surface, a substrate which is provided so as to face the second surface of the support component, and a component which is inserted into the substrate in the first direction and which presses a specified area of the second surface, positioned at a second distance shorter than the first distance from the support part, toward the housing in a direction opposite to the first direction.