Abstract: Provided is an electrically conductive roller capable of preventing the occurrence of filming for a long time and of providing toners with a desired quantity of electric charge, and a development apparatus and an image-forming device capable of forming high quality images for a long time. The electrically conductive roller has a urethane coat layer that contains a urethane resin and a particulate amino resin, wherein the urethane coat layer is formed on an outer circumferential face of an elastic layer, and a development apparatus and image-forming device equipped with the electrically conductive roller.

Abstract: An object is to enhance workability in attachment in a sound generating apparatus that generates sound by vibrating a vibration plate with a vibrator while ensuring acoustic performance as good as that achieved by fastening with fine screw threads. Workability in attaching operation is improved while ensuring acoustic performance as good as that provided by fastening with fine screw threads, by providing first fixing portion that brings engagement portions into screw engagement with each other by rotation by a predetermined angle that can be attained by a user without taking his/her hand that holds a coupler off it and second fixing portion for fixing the coupler to a bracket so as to prevent the coupler from rotating relative to said bracket in a direction to loosen the engagement achieved by said first fixing portion.

Abstract: An object is to enhance workability in attachment in a sound generating apparatus that generates sound by vibrating a vibration plate with a vibrator while ensuring acoustic performance as good as that achieved by fastening with fine screw threads. Workability in attaching operation is improved while ensuring acoustic performance as good as that provided by fastening with fine screw threads, by providing first fixing portion that brings engagement portions into screw engagement with each other by rotation by a predetermined angle that can be attained by a user without taking his/her hand that holds a coupler off it and second fixing portion for fixing the coupler to a bracket so as to prevent the coupler from rotating relative to said bracket in a direction to loosen the engagement achieved by said first fixing portion.

Abstract: A vehicle audio device includes a vibrator (30), a first threaded member (20), a second threaded member (32), and a ring-shaped resilient member (25). The first threaded member (20) includes a tubular portion (22), an external thread (22m) formed on an outer surface of the tubular portion (22), and a flange (24) formed on one end of the tubular portion (22). The resilient member (25) is fitted around the tubular portion (22) of the first threaded member (20) so as to axially oppose the flange (24) of the first threaded member (20). The second threaded member (32) includes a ring-shaped portion (32f) axially opposing the resilient member (25) from the side of the resilient member (25) not opposing the flange (24) of the first threaded member (20). Internal threads (32w) are formed on an inner surface of the ring-shaped portion (32f) and are engageable with the external threads (22m) of the first threaded member (20). The vibrator (30) is mounted to one of the first and second threaded members (20, 32).

Abstract: A flat speaker comprising a vibrating plate including a spiral voice coil, a lead portion extracted from the vice coil and reinforced by the reinforcing member, and an electric supply line; an edge portion supporting the vibrating plate; and a yoke, supporting the edge portion, on which the permanent magnet arranged to face the voice coil. The flat speaker 1 of the invention includes a vibrating membrane 2 of an insulating base film 3 with a spiral or meandering voice coil 4 formed on one or both faces thereof, a permanent magnet 5 arranged on corresponding location facing the voice coil 4; and a yoke 6 on which the permanent magnet 5 is arranged. The vibrating membrane 2 is avoided from hitting the permanent magnet by providing a perforated sheet on the back face of the yoke to control acoustic resistance.

Abstract: An exciter for directly vibrating a board treated for dustproofing and heat dissipation, provided with a vibrator comprised of an outer yoke, a permanent magnet, and inner yoke, having a coil fixed inserted between the outer yoke and inner yoke, and having a coupler member for coupling the exciter to the surface of the board. The coupler member and vibrator are connected by an elastic member. A closed space is formed in the exciter by providing a sealing member between the outer yoke and coupler member. A through hole is formed in the outer yoke. Due to the vibration of the vibrator at the time of coil excitation, air convection is caused through the through hole between the closed space and the outside space.

Abstract: An object is to enhance workability in attachment in a sound generating apparatus that generates sound by vibrating a vibration plate with a vibrator while ensuring acoustic performance as good as that achieved by fastening with fine screw threads. Workability in attaching operation is improved while ensuring acoustic performance as good as that provided by fastening with fine screw threads, by providing first fixing means that brings engagement portions 31 and 41 into screw engagement with each other by rotation by a predetermined angle that can be attained by a user without taking his/her hand that holds a coupler 3 off it and second fixing means for fixing the coupler 3 to a bracket 4 so as to prevent the coupler 3 from rotating relative to said bracket 4 in a direction to loosen the engagement achieved by said first fixing means.

Abstract: A vehicle audio device includes a vibrator (30), a first threaded member (20), a second threaded member (32), and a ring-shaped resilient member (25). The first threaded member (20) includes a tubular portion (22), an external thread (22m) formed on an outer surface of the tubular portion (22), and a flange (24) formed on one end of the tubular portion (22). The resilient member (25) is fitted around the tubular portion (22) of the first threaded member (20) so as to axially oppose the flange (24) of the first threaded member (20). The second threaded member (32) includes a ring-shaped portion (32f) axially opposing the resilient member (25) from the side of the resilient member (25) not opposing the flange (24) of the first threaded member (20). Internal threads (32w) are formed on an inner surface of the ring-shaped portion (32f) and are engageable with the external threads (22m) of the first threaded member (20). The vibrator (30) is mounted to one of the first and second threaded members (20, 32).

Abstract: There is provided a multi-ringed bulb including a plurality of ring bulbs in which a plurality of straight tube portions having an outside diameter of from 12 to 20 mm are connected to each other through bent portions on a same plane. Electrodes are provided hermetically at respective ends of outermost and innermost bulbs of the plurality of ring bulbs. A connection portion connects other adjacent ends of the outermost and innermost bulbs to each other so that the outermost and innermost bulbs communicate with each other, to form a single discharge path. A phosphor layer is formed on inner surfaces of at least the straight tube portions 5a of the inner and outer bulbs. The multi-ringed structure bulb is filled with discharge medium. The above-mentioned structure permits to provide a fluorescent lamp and a lighting apparatus, which have a small strain in the inner and outer bulbs, a high strength and an excellent luminous efficiency.

Abstract: A fluorescent lamp includes: a bulb including bent and straight-tube portions having an external tube diameter of 12 to 20 mm and a tube length of 800 to 2500 mm. The straight portions are disposed generally within the same plane through the bent portions. A pair of end portions with electrodes sealed therein form a single discharge path through the straight tube and bent portions. A phosphor layer is formed on the inner face of the bulb, and a discharge medium including mercury is sealed in the bulb. Thermal deterioration of the phosphor layer formed at the straight tube portions is reduced so deterioration of the initial light flux is suppressed, allowing lighting at higher efficiency. With the above configuration, a fluorescent lamp is compact and capable of light with high efficiency, and with improved light output properties. A light fixture uses this fluorescent lamp.

Abstract: A flat speaker comprising a vibrating plate including a spiral voice coil, a lead portion extracted from the vice coil and reinforced by the reinforcing member, and an electric supply line; an edge portion supporting the vibrating plate; and a yoke, supporting the edge portion, on which the permanent magnet arranged to face the voice coil. The flat speaker 1 of the invention includes a vibrating membrane 2 of an insulating base film 3 with a spiral or meandering voice coil 4 formed on one or both faces thereof, a permanent magnet 5 arranged on corresponding location facing the voice coil 4; and a yoke 6 on which the permanent magnet 5 is arranged. The vibrating membrane 2 is avoided from hitting the permanent magnet by providing a perforated sheet on the back face of the yoke to control acoustic resistance.

Abstract: A fluorescent lamp 1 comprises: a bulb 2 formed by heating bent-portion-formation preordination portions of a single straight-tube-shaped bulb 2a having an external tube diameter of 12 to 20 mm and a tube length of 800 to 2500 mm, forming a plurality of bent portions 2c and straight tube portions 2b adjacent to the bent portions 2c by bending processing, such that the straight portions 2b are disposed generally within the same plane by way of the bent portions 2c, forming in close proximity a pair of end portions 2d and 2d with electrodes 5 and 5 sealed in so as to form a single discharge path through the straight tube portions 2b and bent portions 2c, forming a phosphor layer 4 on the inner face of the bulb, and sealing a discharge medium including mercury; and a base 6 provided on the end portions 2d and 2d of the bulb 2; whereby thermal deterioration of the phosphor layer 4 formed at the straight tube portions 2b is reduced so deterioration of the initial light flux is suppressed, allowing lighting at high

Abstract: A speaker apparatus which does not need insertion of a stand into a speaker box, and which can prevent vibrations occurring in a speaker unit from transmitting to the speaker box by the speaker apparatus itself is provided. Within a speaker box which can be divided into first and second half portions, a plurality of supports extending from a main body portion of a weight radially are fixed at a connecting portion of the speaker box by bolts. A driving portion of a speaker unit is coupled to the main body portion of the weight, and is supported inside the speaker box in a manner that vibrations do not transmit, by the main body portion of the weight acting as a virtual ground. In order to swing the speaker box, a stand and the speaker box are pivotally supported by a pivotally supporting mechanism.

Abstract: There is provided a multi-ringed bulb including a plurality of ring bulbs in which a plurality of straight tube portions having an outside diameter of from 12 to 20 mm are connected to each other through bent portions on a same plane. Electrodes are provided hermetically at respective ends of outermost and innermost bulbs of the plurality of ring bulbs. A connection portion connects other adjacent ends of the outermost and innermost bulbs to each other so that the outermost and innermost bulbs communicate with each other, to form a single discharge path. A phosphor layer is formed on inner surfaces of at least the straight tube portions 5a of the inner and outer bulbs. The multi-ringed structure bulb is filled with discharge medium. The above-mentioned structure permits to provide a fluorescent lamp and a lighting apparatus, which have a small strain in the inner and outer bulbs, a high strength and an excellent luminous efficiency.

Abstract: An exciter for directly vibrating a board treated for dustproofing and heat dissipation, provided with a vibrator comprised of an outer yoke, a permanent magnet, and inner yoke, having a coil fixed inserted between the outer yoke and inner yoke, and having a coupler member for coupling the exciter to the surface of the board. The coupler member and vibrator are connected by an elastic member. A closed space is formed in the exciter by providing a sealing member between the outer yoke and coupler member. A through hole is formed in the outer yoke. Due to the vibration-of the vibrator at the time of coil excitation, air convection is caused through the through hole between the closed space and the outside space.