A buzzer for a watch has an electromagnet system attached to a support arm, one end of which can be fixed in the watch and the other, free end of which can be adjusted relative to a membrane with a first adjusting element which is in a contacting relationship with the watch. The buzzer has a tongue, clamped tightly on one side, which can be excited to oscillate by the electromagnet system and which strikes against the membrane either directly or indirectly. The location of the tongue relative to the electromagnet system is adjustable by means of a second adjusting element acting on it in the vicinity of the tightly clamped end of the tongue.
A resilient member for connecting a crystal to a watch casing in which the crystal is used for generating acoustic signals. The member is of generally annular configuration with an inner portion rigidly connected to the circumference of the crystal, an outer peripheral portion connected to a supporting member of the watch casing, and a free portion extending between the inner portion and the outer peripheral portion. The free portion has a width and a thickness which permits flexing in a direction normal to the plane of the crystal so that the crystal can vibrate in a direction normal to its plane and act as an acoustical transmitting member.
A waterproof acoustic vibrator for a timepiece and comprising a waterproof housing and a plate-like member having a magnetic portion. The plate-like member is mounted for oscillation opposite the waterproof housing and is maintained in a rest position by first magnetic biasing structure. Second magnetic biasing structure magnetically biases the plate-like member to oscillate and develop audible acoustic waves. The first magnetic biasing structure is a permanent magnet, and the second magnetic biasing structure is an electromagnet disposed within the waterproof housing.
The invention concerns, in particular, an electric wristwatch having an alarm device. In accordance with the invention, the impulses produced for driving the electric movement in the watch are, also, used for operating or controlling the signal-source to the alarm device. For example, in an electric quartz watch the impulses can be extracted from any chosen stage of the frequency divider and after amplificaton can be used to control the signal-source to a buzzer. It is the low pulse repetition frequency of the driving impulses, in balance wheel type watches, which leads to a distinctive signal.
An electro-acoustic device for an alarm watch includes a lever moved by an oscillating electromagnetic field created by an electromagnet to vibrate a moving element or glass of the watch and produce a sound. The glass is elastically mounted on a sealing ring of the watch. The lever is mounted by one end to the watch and includes a tapered part adjacent the one end which is elastically deformable thereat so that a free end of the lever opposite the one end may vibrate and its fundamental frequency in response to the oscillating electromagnetic field. The free end of the lever carries a stem coupling the lever to the glass and transmitting the oscillating motion of the lever to the glass, which vibrates on the elastic ring to produce the sound.
