A small electronic equipment with a vibration alarm has, as a drive source, a flat stator type bipolar stepping motor, which has a rotor having high durability, can be assembled easily, requires low power consumption, is started constantly stably, and can be rotated at a high speed. In this electronic equipment with the vibration alarm, a rotor (1) is rotated by a rotary drive system including a drive pulse generating means (112, 113, 114), a drive circuit (110), a flat stator (6), a counter electromotive voltage detection coil (306), and a magnetic pole position detection means (107, 115, 116), so that an eccentric weight (2) fixed to the rotor is rotated, thereby generating vibration. The drive pulse generating means outputs a pulse signal for driving the stepping motor on the basis of an alarm signal output at alarm time. The drive circuit supplies a drive current to a drive coil (305) on the basis of the pulse signal from the drive pulse generating means. The flat stator transmits the magnetomotive force generated in the drive coil to the rotor (1). The counter electromotive voltage detection coil detects a counter electromotive voltage generated by rotation of the rotor. The magnetic pole position detection means detects the magnetic pole position of the rotor (1), which is rotating, with respect to the flat stator (6) on the basis of the counter electromotive voltage generated in the counter electromotive voltage detection coil, and outputs, to the drive pulse generating means, a detection signal for controlling the output timing of the pulse signal supplied from the drive pulse generating means (114).
This is a continuation of application Ser. No. 08/146,181, filed as PCT/JP93/00324, Mar. 18, 1993 published as WO93/19404, Sep. 30, 1993 now abandoned, the disclosure of which is incorporated by reference.
Priority Data
Mar 18, 1992 [JP] 4-091479 Dec 16, 1992 [JP] 4-354452
Brushless motors for portable information equipment that can be simultaneously reflow-soldered to a substrate and efficiently and densely mounted thereon in such a way that the coupled portion between the motor and the substrate has a high impact resistance, thereby providing small and reliable portable information equipment having a high productivity. The brushless motor including a housing having a bottom surface, a side surface, and a top surface, the bottom surface being located adjacent and opposite to a substrate of equipment; a plurality of lands (2a, 2e) on the bottom surface that can be mechanically or electrically joined with the substrate of the equipment; a stator (1), a bearing device (3), and a rotor (4) inside said housing, the stator (1) having a stator core (6) and a coil (7) wound around the stator core (6), the rotor (4) having a magnet (13) and being supported by the bearing device (3) so as to rotatably surround the periphery of the stator (1), the rotor (4) further including a circular weight (14).
Brushless motors for portable information equipment that can be simultaneously reflow-soldered to a substrate and efficiently and densely mounted thereon in such a way that the coupled portion between the motor and the substrate has a high impact resistance, thereby providing small and reliable portable information equipment having a high productivity. The brushless motor including a housing having a bottom surface, a side surface, and a top surface, the bottom surface being located adjacent and opposite to a substrate of equipment; a plurality of lands (2a, 2e) on the bottom surface that can be mechanically or electrically joined with the substrate of the equipment; a stator (1), a bearing device (3), and a rotor (4) inside said housing, the stator (1) having a stator core (6) and a coil (7) wound around the stator core (6), the rotor (4) having a magnet (13) and being supported by the bearing device (3) so as to rotatably surround the periphery of the stator (1), the rotor (4) further including a circular weight (14).
Brushless motors for portable information equipment that can be simultaneously reflow-soldered to a substrate and efficiently and densely mounted thereon in such a way that the coupled portion between the motor and the substrate has a high impact resistance, thereby providing small and reliable portable information equipment having a high productivity. The brushless motor including a housing having a bottom surface, a side surface, and a top surface, the bottom surface being located adjacent and opposite to a substrate of equipment; a plurality of lands (2a, 2e) on the bottom surface that can be mechanically or electrically joined with the substrate of the equipment; a stator (1), a bearing device (3), and a rotor (4) inside said housing, the stator (1) having a stator core (6) and a coil (7) wound around the stator core (6), the rotor (4) having a magnet (13) and being supported by the bearing device (3) so as to rotatably surround the periphery of the stator (1), the rotor (4) further including a circular weight (14).
To provide a wrist watch with a vibration function which can more enhance the vibration effect so that even when the user is, for example, sleeping deeply, the vibration function can effectively act on the user. The wrist watch with a vibration function comprises a watch case, a box part formed at an under surface of the watch case, at least one vibration motor received in the box such that a part of the vibration motor projects from the box part, a cover formed of a flexible material and adapted to cover for positioning the vibration motor, a bottom case serving as a lower surface and having a window formed in a part of the bottom case, and a vibration source received in the case and projecting from the window in a loosely fitted state.
A multimode electronic timepiece for assisting a person to take a multiple question timed examination. The number of questions and test time are entered into the timepiece along with selected alert points. A test timer mode then displays time remaining in the examination along with the corresponding question number, and a silent vibrating alarm alerts the person at the preselected alert points, and displays appropriate informative and encouraging messages.
