Abstract: The present invention is to provide a speaker having a long voice coil bobbin and a plurality of dampers, wherein each of the dampers is formed with a central hole for connecting to the long voice coil bobbin at a position adjacent to a lower or upper end of a cone frame of the speaker for enabling the long voice coil bobbin to stably vibrate due to the balance effect of the dampers. In addition, since a ratio of 3˜6 is defined between the length of the long voice coil bobbin and winding length of a voice coil unit of the speaker, the long voice coil bobbin is able to perform the true frequency and amplitude of mega bass more precisely and transmit the vibration to a diaphragm of the speaker for enhancing the vibration strength of the diaphragm and improving the sound quality and volume of the speaker effectively.

Abstract: A speaker may include a center pole and a voice coil bobbin having a bobbin that may include nonmagnetic and electric conductor layers and insulator layers disposed between the electric conductor layers. An electrostatic capacity, which is formed between the center pole and the voice coil bobbin, is detected and outputted as an electrical signal.

Abstract: A bobbin includes a paper matrix and a plurality of carbon nanotubes dispersed in the paper matrix. A loudspeaker includes a magnetic circuit, a bobbin, a voice coil, a damper, and a diaphragm. The magnetic circuit defines a magnetic gap. The bobbin is located in the magnetic gap and includes a paper matrix and a plurality of carbon nanotubes dispersed in the paper matrix. The voice coil is wounded on the bobbin. The damper is fixed to the bobbin. The diaphragm includes an inner rim fixed to the bobbin and held mechanically by the damper.

Abstract: A speaker may include a voice coil bobbin and a center pole. The voice coil bobbin may include a nonmetallic pipe body as a base of the voice coil bobbin, a first nonmagnetic and electric conductor film which is formed on an inner peripheral face of the pipe body, and a second electric conductor film which is formed on an outer peripheral face of the pipe body such that the first electric conductor film is covered by the second electric conductor film through the pipe body. An electrostatic capacity that is formed between the voice coil bobbin and the center pole is detected and outputted as an electric signal.

Abstract: According to the invention, a whole-surface driven, flat thin loudspeaker that brings about smooth frequency characteristics with split vibration hardly caused is realized, and a voice coil assembly that has high reproduction efficiency and fewer operation failures, and brings about favorable work efficiency in manufacturing and further reduced manufacturing cost, and a loudspeaker using the same are manufactured.

Abstract: A bobbin is a hollow tubular structure formed of a carbon nanotube composite structure. A loudspeaker includes a magnetic circuit; a bobbin; a voice coil; and a diaphragm. The magnetic circuit defines a magnetic gap. The bobbin is located in the magnetic gap. The voice coil is wounded on the bobbin. The diaphragm includes an inner rim fixed to the bobbin. The bobbin is a hollow tubular structure formed of a carbon nanotube composite structure.

Abstract: A bobbin for a loudspeaker includes at least one base and at least one carbon nanotube structure. The at least one carbon nanotube structure is positioned on at least one surface of the base. A loudspeaker includes a magnetic circuit, a bobbin; a voice coil, and a diaphragm. The magnetic circuit defines a magnetic gap. The bobbin is located in the magnetic gap and includes at least one carbon nanotube structure. The voice coil is wounded on the bobbin. The diaphragm includes an inner rim fixed to the bobbin.

Abstract: A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

Abstract: A voice coil bobbin is formed by skinpass rolling of pure titanium. A manufacturing method of a voice coil bobbin includes a process which manufactures a rolled pure titanium material, a process which executes skinpass rolling of the rolled material, and a process which forms the rolled material after the skinpass rolling to manufacture the voice coil bobbin. For example, the rolled pure titanium material is manufactured by a standard manufacturing process of a normal rolled material defined by JISH4600, and the cold rolling for the purpose of the strengthening is executed. The cold rolling is executed under a condition of a rolling ratio equal to or larger than 60%. Thereby, it becomes possible to obtain double hardness of JIS No. 1-kind titanium material (TR270C) and tensile strength larger than double of the JIS No. 1-kind titanium material (TR270C) and close to 6-4 titanium.

Abstract: Voice coil body of a loudspeaker is provided at the outer circumferential wall surface with a supporting section. Diameter of the inner circumference of suspension holder is greater than outer diameter of the voice coil body while diameter of the inner circumference of diaphragm is greater than diameter of the inner circumference of suspension holder for facilitating a gluing of the inner circumferential end of suspension holder and the inner circumferential end of diaphragm on the supporting section and to the voice coil body. By so doing, harmonic distortion of a loudspeaker can be further reduced.

Abstract: The present invention is intended as a method for producing an electromagnetic transducer of variable reluctance type, where the transducer's seismic mass side and load side are mounted together in a first step while the inner and/or outer air gaps are supplied with shims in order to create balanced air gaps in an axial direction between the bobbin core's arms and the inner and outer yokes, whereupon in a second step the bobbin core is fixed through the side piece to an adapter already attached in a corresponding free moving end of a spring suspension, with compliant properties working in an axial direction and arranged between the seismic mass side and the load side in resting state in order to maintain balanced air gaps when finally, in a third step, the shims are removed and the air gaps are released.

Abstract: A speaker may include a center pole, a voice coil bobbin having a nonmetallic pipe body, and a first and a second electrodes which are provided on an inner peripheral face of the pipe body for detecting an electrostatic capacity. The first and the second electrodes are disposed so as to be separated from each other with a predetermined space along an axial direction of the center pole. Further, a stepped portion may be formed in the side circumferential face of the center pole such that, when the voice coil bobbin is operated, a first facing area of the first electrode to the side circumferential face defined by the stepped portion of the center pole increases while a second facing area of the second electrode to the side circumferential face defined by the stepped portion of the center pole decreases by a same amount as an increased amount of the first facing area.

Abstract: According to the invention, a whole-surface driven, flat thin loudspeaker that brings about smooth frequency characteristics with split vibration hardly caused is realized, and a voice coil assembly that has high reproduction efficiency and fewer operation failures, and brings about favorable work efficiency in manufacturing and further reduced manufacturing cost, and a loudspeaker using the same are manufactured.

Abstract: A speaker device includes a magnetic circuit system and a vibration system. The vibration system has a voice coil bobbin, a voice coil wound therearound, a damper, an annular member, a diaphragm and one additional annular member fixed to the voice coil via an adhesive. In the vibration system, the additional annular member and the annular member are arranged on the lower side of the damper and on the upper side of the damper, respectively. A flat portion in the vicinity of the inner peripheral edge portion of the damper is sandwiched between the additional annular member and the annular member.

Abstract: An armored voice coil assembly comprises a former that is impregnated with a curable resin, preferably polyimide resin. Voice coil wire is wound around the outside surface of the former and is then preferably encased with an outer layer of resin impregnated glass fabric wrapped around the voice coil windings, effectively enveloping the voice coil within inner and outer layers of fabric and resin. The armored voice coil assembly is then cured into a solid shape.

Abstract: In a speaker device, each inner peripheral edge portion of a conductive damper and an ordinary damper is fixed to an area in the vicinity of a lower end of a cylindrical portion of a connecting member, and each outer peripheral edge portion of them is fixed to a support member. The conductive and ordinary dampers are attached to an area within a constant winding width of a voice coil. When the speaker device is driven, the voice coil bobbin vibrates in an axial direction of the speaker device. The voice coil bobbin sometimes rolls due to various factors. Since a fulcrum of the rolling is within the winding width, a distance r2 from the fulcrum P11 to an intersection of a central axis of the speaker device and a plane surface including a center in the winding width becomes short, and the bobbin hardly rolls.

Abstract: In an electro-acoustic converter, a frame is bonded to the magnetic circuit, and the diaphragm is bonded to a circumferential edge of the frame. The voice coil is attached to the diaphragm and a part thereof is located in a magnetic gap of the magnetic circuit. The terminal is made of a sheet metal having spring property and electrical conductivity, and a part thereof is fixed to the frame. The terminal has a bent portion and a contact portion, and is electrically connected to the voice coil. The stopper is provided around a portion of the terminal at one side nearer to the frame than the bent portion, and protrudes from a surface of the frame where the contact portion of the terminal protrudes. The stopper restricts bending of the terminal to an extent within a threshold value of reversibility of a material the sheet metal.

Abstract: A speaker diaphragm 1 includes a first diaphragm portion 5, a second diaphragm portion 6 integrally molded with the first diaphragm portion 5, and a bobbin-receiving portion 7 protruding from a back side of a connecting portion between the first diaphragm portion 5 and the second diaphragm portion 6, with one end of a voice coil bobbin 2 being bonded to the bobbin-receiving portion 7. The bobbin-receiving portion 7 includes a first extension 8 extending backwards from the first diaphragm portion 5 and a second extension 9 extending backwards from the second diaphragm portion 6. A bobbin-receiving groove 10 is defined between the first extension 8 and the second extension 9. The voice coil bobbin 2 is inserted in and bonded to the bobbin-receiving groove 10.

Abstract: A portable electronic device includes an electronic component, a spring terminal extending from the electronic component to supply power to the electronic component, a circuit component having a power supply section contacting the spring terminal, and a stopper for restricting a movement of the electronic component. The spring terminal has a reversible deformation limit of elastic deformation. The stopper restricts the movement of the electronic component within the reversible deformation limit of the spring terminal. This portable electronic device prevents a spring pressure of the spring terminal from decreasing, hence supplying power to the electronic component stably.

Abstract: A speaker device includes a terminal member, a connecting member, a conductive damper and a diaphragm. The connecting member has a terminal mounting part. The terminal mounting part has a projecting part and a connecting part. The connecting member has a hole in its upper end portion and a fixing part at its lower end portion. The terminal member is mounted to the terminal mounting part. At this time, the projecting part is inserted into the hole, and the fixing part is inserted into a groove. Thereby, at positions of two spots, the terminal member is physically fixed to the connecting member. The connecting part is connected to the conductive member of the conductive damper. Thus, a soldering operation of the connecting part and the conductive member can be performed easily. Then soldering is performed for the terminal member, a lead wire of a voice coil and the conductive member.

Abstract: A speaker device includes a terminal member, a connecting member, a conductive damper and a voice coil. The terminal member has a first connecting part, a slit, a hole, a second connecting part and a fixing part. The connecting member has a projecting portion on a bent portion and a groove at an area in the vicinity of a lower end of an outer peripheral wall of the cylindrical portion. The terminal member is mounted to the connecting member. A lead wire is wound around the slit of the connecting part, and a portion thereof is soldered. The projecting portion is inserted into the hole. The fixing part is inserted into the groove. The second connecting part is connected to a conductive member of the conductive damper disposed at the area in the vicinity of the lower end of the outer peripheral wall of the cylindrical portion by the soldering.

Abstract: A voice coil includes a bobbin formed of a wooden sheet obtained by slicing natural wood to a predetermined thickness and a coil that surrounds an outer circumference of the bobbin.

Abstract: In a speaker device, when an excessive driving signal larger than a withstand input is inputted to a voice coil, a voice coil bobbin moves with large magnitude. When the voice coil bobbin largely moves on a side opposite to a sound emitting side (downward), each component of the speaker device collides with each other and a large abnormal sound occurs. Therefore, a connecting member and a pot type yoke are designed to collide with each other via a buffer member in an area E1, for example, when the voice coil moves downward with the large magnitude. Namely, the buffer member is attached on a bottom surface of a bent portion of the connecting member, opposite to an upper surface of a cylindrical portion of the pot type yoke, in a circumferential direction.

Abstract: The present invention relates to an electromagnetic vibrator of variable reluctance type, according to a new principle which provides higher efficiency, smaller dimension, and higher reliability compared to known technology. This has been obtained by that the magnetic signal flux generated by the coil is closed through a bobbin body and one or more yokes, and wherein the bobbin body and the yokes are made of laminated metal sheets having good magnetic properties.

Abstract: There is provided a speaker apparatus manufactured by using a voice coil configured so that a lead wire electrically connected to a coil is clamped between an insulating sheet and a bobbin.

Abstract: A voice coil bobbin coupled to a damper is allowed to vibrate in its axis direction within a magnetic circuit including a magnet and a plate supported by a yoke. A range extending between a neutral position of an end of the voice coil bobbin and a portion of the yoke opposing the end of the voice coil bobbin is longer than a range extending between the plate and a neutral position of a portion where the voice coil bobbin is coupled to the damper. A damper ring is fitted around the voice coil bobbin in a position closer to the plate within the portion where the voice coil bobbin is coupled to the damper. A rear face of the damper ring opposing the plate is shaped in face-geometry parallel to a face of the plate opposing the damper ring.

Abstract: An electromagnetic transducer such as an audio loudspeaker, whose diaphragm assembly and motor both have a highly elongated shape in which the long dimension is at least 3× greater than the short dimension. The diaphragm may be obround, and the motor's magnetic air gap may comprise a pair of elongated, parallel, linear gaps. A novel “boxcar” device is used to hold the bobbin and voice coil in an obround shape, maintaining the parallel, linear shape of their elongated sides. The lower suspension may be disposed only at the ends of the motor, enabling the narrowest possible configuration.

Abstract: A full-range speaker device is provided herein that can deliver high-fidelity trebles. The major feature of the present invention lies in that the voice coil is sandwiched between two or more concentric bobbins. As such, out of the same back-and-forth movement of the bobbins, different ranges of sounds are produced through separate bobbins by the diaphragms attached to the bobbins, respectively.

Abstract: A bobbin interconnection assembly in a moving coil loudspeaker is disclosed. The assembly includes a first coupling member fixed to a central region of a diaphragm of the loudspeaker. The assembly also includes a second coupling member that may be removably engaged to the first coupling member. The second coupling member is fixed to an inner rim of an annular damper, and to a voice coil bobbin.

Abstract: In manufacturing a speaker, ultrasonic complex vibration welding is applied at least to: a process of fixedly putting together a magnet, a pot yoke a the pole piece; a process of fixing, to a portion of an inner circumference of a frame, an outer periphery of a spider, which has its periphery fixed to a bobbin; a process of fixing to a portion of the frame an outer circumferential edge of a surround, which has its inner circumferential edge fixed to an outer periphery of a diaphragm whose inner periphery is fixed to the bobbin; and a process of fixedly connecting both ends of each of tinsel leads respectively to terminations of a voice coil and to terminals.

Abstract: An oval speaker apparatus includes a diaphragm whose outer peripheral shape in a plan view is oval or elliptical; an oval or elliptical voice coil for driving the diaphragm; an edge which is joined to an outer periphery of the diaphragm; and a frame to which an outer peripheral edge of the edge is fixed. Further, lead wire which is led out from the voice coil is wired so as to traverse the surface of the edge along the minor-axis direction of the diaphragm, and is provided with slack.

Abstract: A speaker includes a substantially rectangular case having connection terminals at corners, a substantially rectangular voice coil, a diaphragm, and a substantially rectangular magnetic circuit. A lead drawn out from a corner of the voice coil in proximity to one of the connection terminals extends to the vicinity of another corner on a shorter side of the voice coil. The lead is bent, and then is connected to the connection terminal. This configuration can provide a speaker for use in portable equipment, such as a portable telephone, that can meet the requirements of space reduction without impairing characteristics, such as sound quality and sound pressure, and has excellent connection reliability of the terminal and reduced cost.

Abstract: The present invention is directed to methods and apparatus for dissipating heat in a voice coil of a loudspeaker, where at least one of: a bobbin having a substantially cylindrical shaped wall member is operable to support the voice coil, and the wall member includes at least one aperture operable to provide thermal communication from the voice coil through the wall member; and a heatsink is coupled to an outer surface of a bobbin and is in thermal communication with the voice coil.

Abstract: Disclosed is a voice coil mounting structure, which includes a reel, which has a first end mounted with a coil and a second end provided with equiangularly spaced female retaining portions, and a reel holder, which defines an annular space for accommodating the second end of the reel and has female retaining portions provided inside the annular space for engagement with the female retaining portions to lock the reel to the reel holder upon a rotary motion of the reel relative to the reel holder after insertion of the second end of the reel into the annular space.

Abstract: The invention provides a continuous layer of polymer that is shaped to act as the suspension, the former, and an attachment to the diaphragm. The coil may be located within the pocket providing insulation to the coil thus preventing electrical short circuiting of the voice coil as the voice coil expands or contracts based on its operating temperature. The invention also provides an inner flange area of a suspension that may act as a spring generating additional acoustic energy from the compression driver. The inner flange area may also be tuned to vibrate at a predetermined high frequency. Thus, in certain applications, where more acoustic energy is desired at high frequency, the inner flange area may be tuned to provide that extra acoustic energy. To further increase the high frequency energy generated by the compression driver, the diaphragm may be coupled to the bottom side of the inner flange area.

Abstract: A loudspeaker has a diaphragm with a voice coil disposed about its perimeter and extending in a gap into which the flux of an annular rare earth magnet is focused. An opening behind the diaphragm communicates through the speaker frame. The voice coil may have two or more windings that are connected in parallel, and may, e.g., be layered on top of one another, so that the impedance of the coil, as well as its depth in the front/back direction of motion, are low. The voice coil is preferably implemented using a polyamide form or bobbin, which has patterned lead-in conductors embedded therein to bring power to wire windings on the perimeter of the coil. The lead-in conductors extend to, or through, the central opening of a ring magnet, providing a robust ribbon input connection.

Abstract: A transducer (1) includes a transducer axis (2), a membrane (3), a magnet system (6) having an outer magnet system part (7) and an inner magnet system part (8), a moving coil configuration (27) connected to the membrane (3) and having a coil carrier (28) and a moving coil (29) held by the coil carrier (28) in an air gap (14) between the two magnet system parts (7, 8), and guides (36) for rectilinearly guiding the moving coil configuration (27) parallel to the transducer axis (2). The moving coil configuration (27) has a cylindrical boundary surface (42) which, together with a cylindrical boundary surface (15) of the outer magnet system part (7), delimits a cylindrical gap (43) which is acoustically impermeable above a lower limit frequency of at most 100 Hz.

Abstract: A speaker includes: a frame; a magnetic circuit fixed to the frame; a diaphragm fixed to the frame so as to be capable of vibrating in a predetermined direction; a driving force transmitting member connected to the diaphragm; and a damper for supporting the driving force transmitting member, wherein the magnetic circuit is positioned between a first plane and a second plane, the first plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and the second plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and one end of the damper is connected at a position between the first and second planes, and the other end of the damper is connected at another position between the first and second planes.

Abstract: A voice coil bobbin 1 is formed from a material combining a fiber-type material and a ceramic-type-coating agent including metal alkoxide, metal hydroxide, and a colloidal or fine-particulate inorganic substance. The combining process for the ceramic-type-coating agent is performed before or after the fiber-type material is formed into a shape of the voice coil bobbin 1.

Abstract: A loudspeaker includes a bobbin, a coil, a magnetic circuit having a magnetic gap, a first cylinder fixed to the outer surface of the bobbin, a second cylinder connected with the first cylinder, a diaphragm and a damper coupled to the outer circumferential surface of the second cylinder, an edge coupled to the diaphragm, a frame, and terminals. The outer circumference of a yoke constituting the magnetic circuit has a plurality of slits, while the first cylinder and the second cylinder are connected together by a plurality of radially-disposed joints. The loudspeaker has a flat profile yet is compatible with large amplitude and high output power, and capable of reproducing a wide range of sounds from a low tone to a high tone.

Abstract: A loudspeaker comprising a panel-form acoustic member adapted for operation as a bending wave radiator and an electrodynamic moving coil transducer having a voice coil mounted to the acoustic member to excite bending wave vibration in the acoustic member. The junction between the voice coil and the acoustic member is of sufficient length in relation to the size of the acoustic member to represent a line drive such that the acoustic member has a mechanical impedance which has a rising trend with bending wave frequency.

Abstract: In a loudspeaker, even if an interval between a diaphragm and a yoke is small, a lead wire, an end of the coil wire of a voice coil, moves upward and downward in and/or over a cutout portion formed in the yoke, and does not collide with the yoke. The loudspeaker does not have disadvantages, such as noises and disconnection of the end of the coil wire, and can be thin.

Abstract: Speaker design/method positively centering speaker components one with the other with a unique design of the surround and radiator. Surround has a main body extending radially through more than 180°, extending from the body there is a flat outer ring and a flat inner ring at substantially 180° radially around the body from the outer ring with a portion of the main body extending below the inner ring, forming a channel between the inner ring and the body portion that extends below it. The radiator has outer and inner edges with a central opening defined by the inner edge, with the outer edge either blunt or defined by a short downward extending ring. The shape and dimensions of the outer edge of the radiator and the channel are substantially the same outer with the radiator edge fitting snugly within the surround channel.

Abstract: An electromagnetic transducer such as an audio speaker employs a slotted yoke and two suspension components enabling very large excursion relative to the size of the diaphragm which results in improved low frequency output. A first suspension component includes an inner ring, flexible springs, and an outer body. The flexible springs extend through the slots of the yoke and couple the inner ring to the outer body. The inner ring, outer body, and flexible springs of the first suspension component may be of monolithic construction or they may be distinct components coupled together. The inner ring couples to the bobbin of the diaphragm assembly, and the outer body couples to the outer cylindrical surface of the yoke or to a mounting ring which is coupled to the outer cylindrical surface of the yoke. A second suspension component, such as a surround, couples the diaphragm assembly and to the mounting ring.

Abstract: A loudspeaker comprises a frame, a magnetic circuit unit, a vibration unit and a snap fastening device. The frame has a recess. The magnetic circuit unit is received in the recess of the frame. The magnetic circuit unit includes a yoke. The vibration unit is received in the recess of the frame. The snap fastening device connects the yoke, which is inserted into the recess of the frame, to the frame.

Abstract: Supplemental portions are added to lead portions of a voice coil attached to a coil bobbin. The supplemental portions each has a shape, which can be restored repeatedly in response to stress, applied to the lead portions. In the case where stress is exerted on the lead portions under the influence of the pulling stress and compressive stress produced in the winding portion when a large driving current is supplied to the voice coil, the supplemental portions are deformed, thereby preventing the wire breaking at the lead portions.

Abstract: The invention provides a continuous layer of polymer that is shaped to act as the suspension, the former, and an attachment to the diaphragm. The coil may be located within the pocket providing insulation to the coil thus preventing electrical short circuiting of the voice coil as the voice coil expands or contracts based on its operating temperature. The invention also provides an inner flange area of a suspension that may act as a spring generating additional acoustic energy from the compression driver. The inner flange area may also be tuned to vibrate at a predetermined high frequency. Thus, in certain applications, where more acoustic energy is desired at high frequency, the inner flange area may be tuned to provide that extra acoustic energy. To further increase the high frequency energy generated by the compression driver, the diaphragm may be coupled to the bottom side of the inner flange area.

Abstract: In manufacturing a speaker, ultrasonic complex vibration welding is applied at least to: a process of fixedly putting together a magnet, a pot yoke a the pole piece; a process of fixing, to a portion of an inner circumference of a frame, an outer periphery of a spider, which has its periphery fixed to a bobbin; a process of fixing to a portion of the frame an outer circumferential edge of a surround, which has its inner circumferential edge fixed to an outer periphery of a diaphragm whose inner periphery is fixed to the bobbin; and a process of fixedly connecting both ends of each of tinsel leads respectively to terminations of a voice coil and to terminals.

Abstract: In order to prevent electric current from being induced in accordance with variation of magnetic force of a voice coil so that dynamic characteristics of a speaker are enhanced, a magnetic shielding member 1 composed of a magnetic material is disposed between the voice coil 12 and a detection coil 13. And by flowing magnetic force lines generated at the voice coil 13 to the magnetic shielding member 1, the magnetic force lines are prevented from reaching the detection coil 13.

Abstract: A high frequency transducer having a dome diaphragm with a configuration of a bisected ellipse to overcome the distortion and breaking point of prior art even domes at frequencies above 30 kHz. The dome diaphragm having an annular skirt extending therefrom in an integral fashion and connecting to a disc shaped plate of the transducer. A voice coil of cylindrical section being directly connected to the skirt at a region of close proximity to said dome. The dome being constructed of a rigid material such as a metal, an alloy, a metalloid such as, but not limited to, titanium, aluminum, and boron, or a combination thereof. The dome being constructed in accordance with a general formula for an ellipse (x2/a2)+(y2/b2)=1, and a>b. Wherein a is half of the distance of major axis and b is half of the distance of a minor axis.