41results about How to "Wide directivity" patented technology

A light-emitting device is provided that can extract light in all directions and that has wide directivity. This light-emitting device includes: an elongated bar-shaped package extending sideways, the package being formed such that a plurality of leads are formed integrally with a first resin with part of the leads exposed; a light-emitting element that is fixed onto at least one of the leads and that is electrically connected to at least one of the leads; and a second resin sealing the light-emitting element. In the light-emitting device, the first resin and the second resin are formed of optically transparent resin, and the leads have outer lead portions used for external connection and protruding sideways from both left and right ends of the package.

A speaker of the present invention includes the following: a diaphragm that includes an inner periphery coupled to a voice coil, and a corrugation provided at the intermediate position between the inner periphery and an outer periphery; a speaker edge for supporting the outer periphery of the diaphragm; and a damping member attached to an outer peripheral part of the diaphragm outside the vicinity of an outer periphery of the corrugation. The effective vibration area of an inner peripheral part of the diaphragm inside an inner periphery of the corrugation is substantially half or less of the total effective vibration area. The damping member is configured as a damping portion by extending an overlap portion of the speaker edge overlapping with the diaphragm to the vicinity of the outer periphery of the corrugation. This configuration can suppress the vibration transmission at high frequencies to the outer peripheral part of the diaphragm outside the corrugation, allows only the inner peripheral part of the diaphragm inside the corrugation to mainly vibrate at high frequencies, and also can suppress a resonance in the outer peripheral part of the diaphragm outside the corrugation. Thus, the speaker can have both an excellent high frequency response and an excellent mid-high frequency response.

A speaker apparatus includes a speaker unit including a magnet configured to provide a magnetic field; and a membrane disposed in the magnet field, configured to be vibratable in a first direction, and configured to emit a sound in a second direction perpendicular to the first direction; and a blocking unit disposed at the membrane, configured to block a first region of the membrane having a first height along the first direction from being exposed and configured to expose a second region of the membrane having a second height, a sum of the first and the second heights corresponds to a total height of the membrane, wherein the first height of the membrane blocked by the blocking unit is less than a half of a wavelength corresponding to a maximum frequency in a frequency domain of the sound emitted from the membrane.

The present invention provides a radome that can have a wide vertical radiation patter, as well as an antenna device provided with the radome, and a radar apparatus provided with the antenna device. The radome (10) includes an outer wall (11) having a side cross-section formed in a substantially semi-circular shape, and an inner wall (12) arranged at the inner side of the outer wall. The inner wall includes a first inner wall (211) and second inner walls (212). The first inner wall is arranged, in the side view, so as to be spaced from the outer wall by the fixed smallest gap (dc) within a range from a midpoint (Pc) on the circumference of the outer wall to prescribed distance positions toward both ends (Pe). Each second inner wall is composed of a flat plate which has an end connected with the end of the first inner wall and has a plane parallel to the straight line between the midpoint (Pc) and the center (Po). Therefore, the smallest gap (de) between the outer wall and the inner wall near the ends (Pe) of the outer wall becomes wider than the smallest gap (dc) between the outer wall and the inner wall near the midpoint (Pc) of the outer wall.

An electroacoustic transducer includes a diaphragm including a pair of convex surfaces respectively including convex surfaces of a pair of longitudinal split tubular members. A valley is formed between one side portions of the pair of longitudinal split tubular members. The electroacoustic transducer further includes: a converter configured to convert between a vibration of the diaphragm in a depth direction of the valley and an electric signal corresponding to the vibration; and a supporter supporting other side portions of the pair of longitudinal split tubular members of the diaphragm so as to allow the other side portions to vibrate in a vibration direction of the vibration.

An electroacoustic transducer is provided and includes: a diaphragm having a pair of longitudinal split tubular surfaces arranged next to each other, a valley being formed between respective side portions of the pair of longitudinal split tubular surfaces; a converter including a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm such that the diaphragm is vibratable along the depth direction of the valley. A tubular portion is provided at an intermediate portion of the valley to couple the diaphragm and the voice coil to each other, and the tubular portion extends in the depth direction of the valley.

The invention relates to a panel loudspeaker. The panel loudspeaker comprises a vibrating diaphragm, a piezoelectric device and an outer frame with at least one opening end. The vibrating diaphragm is arranged on the outer part of the outer frame. One end of the vibrating diaphragm is fixed on the opening ends of the outer frame. One end of the piezoelectric device is fixed on the vibrating film and then is surrounded by the outer frame. A positive electrode conductive area and a negative electrode conductive area are arranged on the piezoelectric device. The positive electrode conductive area and the negative electrode conductive area are respectively connected with conductive electrodes. The panel loudspeaker is characterized in that the panel loudspeaker is ultra-thin and sound quality is high.

A microphone array device including microphone capsules and at least one processing unit configured to receive output signals of the microphone capsules, dynamically steer an audio beam based on the received output signal of the microphone capsules, and generate and provide an audio output signal based on the received output signal of the microphone capsules. The processing unit is configured to operate in a dynamic beam mode where at least one focused audio beam is formed that points towards a detected audio source and in a default beam mode where a broader audio beam is formed that covers substantially a default detection area. The microphone array may be incorporated into a conference system.

There is provided a boundary microphone inside which a unidirectional microphone unit is contained, the microphone including: a base plate; and a cover plate attached onto an upper face side thereof, wherein a thin and long tubular groove acting as an acoustic tube for making unidirectivity of the microphone unit a narrow directivity is formed on the base plate side, and therein, the microphone unit is contained. In order to prevent liquid from entering the tubular groove from the outside, between a peripheral edge part of the cover plate and the upper face of the base plate, a spacer that is composed of a water repellent thin film material and allows an inside of the tubular groove and outside air to communicate via acoustic resistance with a thin air layer is disposed so as to enclose an entire periphery of the tubular groove.