Button mechanism and wearable device including the same

A button mechanism, comprising:

• a casing, in which optical signal transmitting parts and optical signal receiving parts are disposed, wherein the optical signal receiving part is connected to a controller;
• and
• a lever comprising a connecting part connected to the casing and a shielding part which is configured to block or not block an optical signal sent by the optical signal transmitting part, wherein the shielding part is connected to the connecting part and the connecting part is an elastic material member that is elastically stretchable,
• wherein when the shielding part is applied with a force to move to a predetermined position in a direction perpendicular to an axis direction of the lever, the optical signal sent by the optical signal transmitting part is transmitted to the optical signal receiving part, and
• wherein when the shielding part is not applied with the force and restored to an initial position, the shielding part blocks the optical signal from the optical signal transmitting part,
• wherein the shielding part is provided with a light passing hole,
• wherein when the shielding part is not applied with the force, the shielding part is located on a transmitting path of the optical signal to block the optical signal, wherein when the shielding part is applied with the force to move to the predetermined position, the optical signal passes through the light passing hole,
• wherein the optical signal transmitting parts comprise a first transmitting part and a second transmitting part, the optical signal receiving parts comprise a first receiving part and a second receiving part having positions corresponding to positions of the first transmitting part and the second transmitting part respectively,
• wherein the shielding part allows different optical signals to pass therethrough at different predetermined positions, and
• wherein the first transmitting part and the second transmitting part are respectively located on two sides in the axis direction of the lever, and the axis direction is the transmitting path of the optical signal of the shielding part when the shielding part is not applied with the force,
• when the lever moves in a first direction perpendicular to the axis direction of the lever, the light passing hole moves between the first transmitting part and the first receiving part, so that the optical signal from the first transmitting part passes therethrough while blocking the optical signal from the second transmitting part, the first receiving p receives the optical signal from the first transmitting part, a screen of a wearable device is switched up,
• when the lever moves in a second direction opposite to the first direction, the light passing hole moves between the second transmitting part and the second receiving part, so that the optical signal from the second transmitting part passes therethrough while blocking the optical signal from the fire transmitting part, the second receiving part receives the optical signal from the second transmitting part, the screen of the wearable device is switched down, and
• when the force is removed, the lever returns to the initial position.