Citizen Electronics Co., Ltd.

Authentic, Inc.

Seiko Instruments Inc

Nec Tokin Corporation

Kazuhiro Kobayashi

Keita Watanabe

Yoshiro Ohkawa

Yasuaki Kayanuma

Shigehisa Watanabe

Yoshizumi Ohta

Naoki Miura

Masayoshi Shiraishi

Hiroo Kajiwara

Toru Ueno

Harunami Suzuki

Yuichiro Tanda

Naoto Yonetake

Osamu Tanabe

An exciter for a panel-type loud speaker comprises a bimorph and a bimorph holding member. The bimorph comprises a plate member and a pair of piezoelectric ceramic layers, each formed on the opposite sides of the plate member. The bimorph holding member is holds one end of the bimorph and comprises a bimorph end holding portion for holding the one end of the bimorph, which comprises a three-layer embedded section embedding the pair of piezoelectric ceramic layers and the plate member sandwiched therebetween at the one end of the bimorph, and an extension embedded section in which an extension of the plate member is embedded, and a mounting protrusion protruding from the bimorph end holding portion, wherein a distal end of the mounting protrusion is connected to the diaphragm so that the bimorph is disposed on the diaphragm with a space interposed between the bimorph and the diaphragm.

Panel-typed loud speaker and an exciter therefor

A compact enclosed type vibrator capable of ensuring a large amount of vibration has a casing (), a coil () and a magnetic circuit unit () provided in the casing, and a suspension () supporting the magnetic circuit unit. The magnetic circuit unit has an extent in the radial direction and has an outer peripheral surface set adjacent to the inner peripheral surface of the casing across an annular gap. At least one of the casing and the magnetic circuit unit is provided with a vent passage (and) that additionally communicates between a first space () and a second space () formed at the upper and lower sides of the magnetic circuit unit.

Vibrator

A flat speaker includes a casing with a display window, a vibratory sound panel mounted to the display window and having a display region and an exciter mount region, a display screen disposed internally of the display region, and an exciter mounted to the inner surface of the exciter mount region. A dust barrier is disposed to isolate a first space defined between the display region and the display screen from a second space surrounding the first space. The dust barrier has a dust barrier member disposed between the display region and the exciter mount region and extending across the vibratory sound panel to inhibit dust particles from moving from said exciter mount region to said display region within said casing. The dust barrier member is yieldingly deformable in response to vibration of said vibratory sound panel.

Acoustic device and flat speaker thereof

An electronic device includes an element having a surface, an electronic part having a surface to be adhesively attached to the surface of the element, and an adhesive sheet having a first adhesive layer releasably attached to the surface of the element, a second adhesive layer releasably attached to the surface of the electronic part and a third layer adhered between the first adhesive layer and the second adhesive layer. The third layer has an extension which extends outwardly from between the surface and the surface.

Adhesive sheet for attaching an electronic part and an electronic device having such an electronic part

An actuator, comprising at least one beam capable of generating flexural oscillations, at least one pair of electric supply terminals () which supply oscillation-inducing electric power to the beam(s), and a holding mechanism which holds the beam(s), the holding mechanism including at least one holding member () to hold one portion of the beam(s) and a case () jointed to the holding member and configured to contain the beam(s) therein.

Actuator

An actuator, comprising a beam () including a laminated structure which has piezoelectric layers () and electrode layers (), a holding mechanism to hold the beam, a feeding terminal () to supply an exciting power to the electrode layers of the beam, and a contact mechanism provided in the holding mechanism, the holding mechanism comprising a case () including a space () to house the beam () and a holding part to hold at least one of an end and a central portion of the beam (), the contact mechanism being configured to contact with a part of the beam () and prevent the beam from excessively deflecting when a great impact is added to the beam.

A bidirectional optical transmission device has a housing having a guide portion in which an end of a single optical fiber is to be inserted. A light-receiving device and a light-emitting device are provided in the housing. Light path restricting members are provided in the light-receiving device so as to restrict light beams entering the light-receiving device.

Growing community of inventors

Fujiyoshida, Japan

Kazuhiro Kobayashi