Abstract: A liquid measuring apparatus is designed for use in liquid chromatographic separation. The apparatus includes a plug body to be connected to the mouth or opening of the liquid container for opening/closing the liquid container, a sound wave producer disposed inside the plug body for providing output of sound wave directed toward the liquid, a receiver disposed inside the plug body for receiving a standing wave composed of an original sound wave provided by the sound wave producer and that part of the original sound wave which has hit against the surface of the liquid and has been reflected by the surface of the liquid, an algorithm for calculating the resonant frequency of the standing wave received by the receiver, and an algorithm for computing the amount of the liquid that remains in the liquid container.

Abstract: A bone conductive speaker is downsized without causing any loss in efficiency, simple in construction low in cost, and comprises yoke (2), magnet (3) disposed in a central area of the yoke, and voice coil (4) wound on the magnet. The yoke has its peripheral area divided into a plurality of upright portions; of the upright portions, each of first ones (5) oppositely disposed from each other is provided with a first engaging means (9) in its upper surface; second engaging means (8) each corresponding to the first engaging means are provided in a vibrating plate (7). The vibrating plate is mounted on a lid portion of the housing in a manner such that the vibrating plate is disposed on the upright portions of the yoke and fixedly mounted by means of the second engaging means in a manner such that the vibrating plate floats in the housing.

Abstract: The object is to provide a bone conduction device. The device is simple in construction, thin in thickness, small in leakage in magnetic flux, excellent in performance, and comprises: abase yoke (1) carrying both a voice coil (3) and a magnet (4); and, a front yoke (5). The yoke (5) assumes a flat plate-like shape and is loosely disposed between: an upper surface of a magnetic pole of the base yoke (1); and, the front yoke (5) to provide a necessary clearance between these yokes. The device is characterized in that the clearance is produced by means of a resilient element (6), which is disposed in an outer peripheral portion of the base yoke (1) to receive the front yoke (5) thereon. Preferably: the base yoke (1) has a circular base (7); and, the resilient element (6) assumes an arcing shape extending along the base (7).

Abstract: The object is to provide a talking device, which employs a bone conduction speaker. The device is small in size, light in weight and excellent in fittingness. Further, the device enables its users to communicate with each other without suffering from any difficulty in hearing even in a noisy environment. The device uses a bone conduction speaker, and may also have an ornamental function to serve as a pendant during non-use of the device. The device comprises a bone conduction speaker (5), an air conduction microphone (6) and a wireless circuit. The device is capable of: fitting to the user's body; and, connecting to a cell phone (8) by wireless through the wireless circuit. Both the bone conduction speaker (5) and the wireless circuit are packed in a head portion (2) of the ornamental pendant.

Abstract: An object of the invention resides in the provision of a bone conduction headset, which is inconspicuous in appearance during wearing thereof, adapted for use in avoiding absorbing nearby people's attention to the headset thus worn, easy to wear and take off in use, and comprises: a band running around a back part of the user's head; a fastening portion formed in each of opposite end portions of the band; a bone conduction speaker provided with a knob which is engaged with the fastening portion; and, an ear engagement portion, which runs over the bone conduction speaker during wearing of the headset to reach and engage with the user's ear. An extension of either the fastening portion in the band or a casing of the bone conduction speaker may be formed into the ear engagement portion.

Abstract: A bone conduction device which, when particularly employed in the receiver of a bone conduction telephone, is capable of obtaining a sufficient amount of sound as to not only a bone conduction sound but also an aerial vibration sound to ensure clear reception of the sound. The bone conduction device comprises a bone conduction device unit and a case receiving the device unit therein to serve as a vibration section and is characterized in that a compliance increasing means, such as a corrugation, is disposed along the peripheral edge of the vibrating surface of the case having the bone conduction device unit fixed thereto.

Abstract: A bone conductive speaker is downsized without causing any loss in efficiency, simple in construction low in cost, and comprises yoke (2), magnet (3) disposed in a central area of the yoke, and voice coil (4) wound on the magnet. The yoke has its peripheral area divided into a plurality of upright portions; of the upright portions, each of first ones (5) oppositely disposed from each other is provided with a first engaging means (9) in its upper surface; second engaging means (8) each corresponding to the first engaging means are provided in a vibrating plate (7). The vibrating plate is mounted on a lid portion of the housing in a manner such that the vibrating plate is disposed on the upright portions of the yoke and fixedly mounted by means of the second engaging means in a manner such that the vibrating plate floats in the housing.

Abstract: An object of the invention resides in the provision of a bone conduction headset, which is inconspicuous in appearance during wearing thereof, adapted for use in avoiding absorbing nearby people's attention to the headset thus worn, easy to wear and take off in use, and comprises: a band running around a back part of the user's head; a fastening portion formed in each of opposite end portions of the band; a bone conduction speaker provided with a knob which is engaged with the fastening portion; and, an ear engagement portion, which runs over the bone conduction speaker during wearing of the headset to reach and engage with the user's ear. An extension of either the fastening portion in the band or a casing of the bone conduction speaker may be formed into the ear engagement portion.

Abstract: In the apparatus, in accordance with the presence or absence of a barrier, arrangement of its light-receiving and its light-emitting element is changed to avoid interference with its proper light-receiving operation from the barrier, which makesso the apparatus free from noise problems, malfunctions and like troubles caused by the interference. In construction, a cover 2 permeable to infrared is rotatably mounted on a base 1. A stationary base plate 9 and a movable base plate 10, which is rotatable together with the cover 2, are stacked together inside the cover 2 to realize a two-layer arrangement. Each of these base plates 9, 10 carries a light-receiving element 7, 12 and/or a light-emitting element 8, 13, and assumes a substantially semicircular shape.