Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to solve the problems that the vibrating diaphragm mechanism of the telephone receiver in the prior art can only improve the low-frequency performance of bass and can not improve the high-frequency performance of the vibrating diaphragm mechanism.
To this end, the invention provides a vibrating diaphragm mechanism applied to a receiver, comprising
A fixed frame with a hollow inner cavity;
One end of the reed is a root side which is connected with the fixed frame through a fixed end, and gaps are formed between the other sides of the reed and the fixed frame and the reed is suspended in the hollow inner cavity;
And an air flow channel formed between the upper and lower surfaces of the fixing frame and the reed in order to seal the gap.
Preferably, the above-mentioned vibrating diaphragm mechanism applied to the receiver, the edge is shaped such that the end of the suspended end opposite to the fixed end on the reed has at least one unfilled corner.
Further preferably, the above vibrating diaphragm mechanism applied to the receiver has two unfilled corners, and the end of the suspended end is trapezoidal or triangular.
Preferably, in the vibrating diaphragm mechanism for a receiver, at least one treble hole is formed in a suspension end of the reed opposite to the fixed end, and Gao Yinkong is distributed in a range of 2/3-1 of a length of the reed from the fixed end in a direction perpendicular to the root side of the reed.
Still preferably, in the diaphragm mechanism for a receiver, at least one bass hole is formed on a fixed end of the reed, the bass hole is distributed in a range of 1/3 of a length of the reed from the fixed end in a direction perpendicular to the root side of the reed, and a caliber of the bass hole is larger than a caliber of Gao Yinkong.
More preferably, in the vibrating diaphragm mechanism applied to a receiver, the reed is further provided with at least one middle sound hole, and the middle sound hole is distributed in a range of 1/3-2/3 of the length of the reed from the fixed end in a direction that the reed is perpendicular to the root side.
Further preferably, in the diaphragm mechanism applied to the receiver, the caliber of the middle sound hole is larger than the caliber of Gao Yinkong and smaller than the caliber of the bass sound hole.
Preferably, the aperture of the bass hole is 0.1mm-1mm;
The caliber of the middle sound hole is 0.01-0.1 mm, and the caliber of Gao Yinkong is 0.003-0.01 mm.
Preferably, in the vibrating diaphragm mechanism applied to the receiver, on the reed, an end of the unfilled corner, which faces the fixed end, is located in a region of the reed where the Gao Yinkong is located.
Preferably, the fixed end of the reed is provided with an elongated hole extending along the root side.
Preferably, in the vibrating diaphragm mechanism applied to the receiver, at least one notch recessed inwards is formed on a side edge of the reed perpendicular to the root side.
Preferably, in the vibrating diaphragm mechanism applied to the receiver, a metal sheet is disposed on a surface of the reed, which is opposite to the sound membrane, and the metal sheet has elasticity greater than that of the reed and thickness smaller than that of the reed.
Preferably, the thickness of the reed is gradually increased from the suspension end to the other end far from the suspension end, and/or
The elasticity of the suspension end is greater than that of the fixed end.
The technical scheme of the invention has the following advantages:
1. The vibrating diaphragm mechanism applied to the telephone receiver provided by the invention comprises a fixed frame, a reed and a sound diaphragm. The fixing frame is provided with a hollow inner cavity, one end of the reed is a root side and is connected with the fixing frame through a fixing end, gaps are formed between other side edges of the reed and the fixing frame, the reed is suspended in the hollow inner cavity, the shape of the edge of the reed corresponding to the side edge of the gap is determined according to the vibration frequency required by the reed, the reed is driven by an electromagnetic mechanism to do reciprocating vibration, a sound membrane is fixed on the fixing frame and covers the reed, and an air flow channel formed by the gaps and between the fixing frame and the upper surface and the lower surface of the reed is sealed.
The vibrating diaphragm mechanism with the structure determines the edge shape of the reed corresponding to the side edge of the gap according to the vibration frequency required by the reed, namely, the edge shape of the suspension end opposite to the fixed end on the reed is changed to change the vibration frequency required by high-pitched sound when the reed vibrates, so that the reed is transferred with an air resonance point, and the high-frequency performance of the receiver is improved. And the sound membrane is not provided with any hole, after the sound membrane is fixed on the fixed frame, the sound producing cavity in the receiver can be isolated from the mounting cavity by the sound membrane, and the gas in the two cavities can not be communicated, so that the sealing performance of the sound producing cavity is ensured. In addition, the reed and the vibrating reed are combined into a whole, a conduction rod is not required to be arranged, only the electromagnetic driving mechanism is required to directly drive the reed to vibrate, the diaphragm mechanism is fixed on the fixed frame in advance before being mounted on the receiver, and the diaphragm mechanism is used as a whole and can be mounted on the shell of the receiver only through the fixed frame, so that the mounting process of the receiver is simplified.
2. The vibrating diaphragm mechanism applied to the telephone receiver provided by the invention has the edge shape that the end part of the suspension end opposite to the fixed end on the reed is provided with at least one unfilled corner. Due to the design of the unfilled corner, the smaller the width of the suspension end of the reed is under the premise of unchanged length of the reed, the higher the frequency of reed vibration is, and the improvement of high-frequency performance is facilitated.
3. The vibrating diaphragm mechanism applied to the telephone receiver provided by the invention has the advantages that at least one high-pitched sound hole is formed in the suspension end, opposite to the fixed end, of the reed, and Gao Yinkong is distributed in the range of 2/3-1 of the length of the reed from the fixed end in the direction of the reed vertical to the root side. The vibrating diaphragm mechanism with the structure is characterized in that a high-pitch hole is formed in the high-pitch sounding position of the reed to change the vibration frequency of the reed material, so that the resonance point of the reed and air resonance is shifted, the high-pitch vibration frequency is adjusted, and the high-frequency performance of the receiver is improved.
4. The vibrating diaphragm mechanism applied to the telephone receiver provided by the invention has the advantages that the fixed end of the reed is provided with at least one bass hole, the bass holes are distributed in the range of 1/3 of the length of the reed from the fixed end in the direction of the reed vertical to the root side, and the caliber of the bass hole is larger than that of Gao Yinkong. The bass hole is arranged to change the vibration frequency of the reed material, so that the resonance point of the reed and air resonance is shifted to adjust the vibration frequency of bass, thereby improving the low-frequency performance of the receiver.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The present embodiment provides a vibrating diaphragm mechanism applied to a receiver, as shown in fig. 1 to 3, including a fixed frame 1, a reed 2 and a sound membrane 3. Wherein the fixed frame 1 is provided with a hollow inner cavity.
The reed 2 is made of magnetic conductive materials, such as iron-nickel alloy, as shown in fig. 1, one end of the reed 2 is a root side and is connected with the fixed frame 1 through a fixed end 21, a gap 5 is reserved between the other side and the fixed frame 1, the reed 2 is suspended in the hollow inner cavity, one end of the reed 2 opposite to the fixed end 21 is a suspended end 22, the suspended end 22 is driven by an electromagnetic mechanism to vibrate reciprocally, as shown in fig. 3, the sound membrane 3 is all attached to the whole fixed frame 1 and covers the reed 2, and an air flow channel formed between the fixed frame 1 and the upper surface and the lower surface of the reed 2 by the gap 5 is sealed. For example, glue is provided on one side surface of the sound membrane 3 at positions corresponding to the fixing frame 1 and the reed 2, and the sound membrane 3 is fixed to the fixing frame 1 and the reed 2 by the glue. That is, the sound membrane 3 seals the gap 5 between the fixed frame 1 and the reed 2, and the sound membrane 3 is not provided with any holes, so that the gas on one side of the fixed frame 1 cannot pass through the sound membrane 3 to the space on the other side.
The shape of the edge of the reed 2 corresponding to the side of the gap 5 is determined according to the vibration frequency required for the reed 2 to improve the high-pitched performance of the reed 2 vibration. As shown in fig. 3, the edge shape of the side edge of the reed 2 is such that two unfilled corners 221 are provided at the end of the suspended end 22 of the reed, and the end of the suspended end 22 is trapezoidal. With respect to the reed 2, the smaller the width of the suspending end 22 is, the easier and the higher the vibration frequency of the suspending end 22 is, and the better the high-frequency performance of improving the vibration of the reed 2 is, on the premise that the length of the reed 2 is not changed. That is, the vibration frequency of the reed 2 itself is changed so that the resonance point between the reed 2 and the air is shifted, thereby improving the high-frequency performance of the reed 2 vibration. Optimally, the two unfilled corners 221 make the end of the free end 22 of the reed 2 triangular, or tapered. If the high frequency performance of the vibration of the reed 2 is only slightly improved, the area of the two unfilled corners 221 can be reduced, or only one unfilled corner 221 can be provided.
As shown in fig. 1, six treble holes 26 are provided in the suspension end 22 of the reed 2, and the treble holes 26 are distributed in the range of 2/3-1 of the length of the reed 2 from the fixed end 21 in the direction perpendicular to the root side of the reed 2. For example, the aperture of the treble hole 26 is in the range of 0.003mm to 0.01mm, for example, 0.003mm, 0.004mm, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.01mm, etc., in which the smaller the aperture of the treble hole 26 is, the higher the frequency of vibration of the reed 2 is, the better the audio performance of the treble is improved, but after the aperture of Gao Yinkong is less than 0.003mm, the improvement degree of the treble is still at the improvement degree when the aperture of the treble hole 26 is 0.003mm, and at this time, after the aperture is reduced again, it exceeds the polarity value of the treble pushing energy, and even if the aperture is reduced again, the treble is not further improved, which is related to the material and structural performance of the reed 2 itself. Of course, the aperture of the treble hole 26 may be designed to be larger than 0.01mm, and the improvement of the treble is weak, and the treble is hardly improved further. In short, by means of Gao Yinkong, the high-frequency performance of the high-pitched sound can be further improved without changing the length of the reed 2.
For the reed, when the width of the reed 2 is unchanged, the smaller the length of the reed 2, the better the performance of improving bass is, and in order not to affect the high-frequency performance, in the embodiment, on the premise of not reducing the length of the reed 2, the middle-tone hole 25 and the bass hole 24 are formed on the reed 2 to improve the medium-frequency performance and the low-frequency performance of the reed vibration, and in the process of improving the treble, the middle-tone and the bass, any hole structure is not formed on the sound membrane 3.
As shown in fig. 1, the fixed end 21 of the reed 2 is provided with two bass holes 24, and the bass holes 24 are distributed in the range of 1/3 of the length of the reed 2 from the fixed end 21 in the direction of the vertical root side of the reed 2 (the direction indicated by the arrow in fig. 1). The aperture of the bass hole 24 is generally controlled within the range of 0.1mm-1mm, for example, 0.1mm, 0.12mm, 0.13mm, 0.14mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm and the like, and the aperture of the bass hole 24 can be smaller than 0.1mm, which also improves the low frequency performance, but the improvement effect is weaker, and the aperture of the bass hole 24 can be larger than 1mm, but after the aperture of the bass hole 24 is larger than 1mm, the degree of improving the low frequency performance is the same as that when the aperture of the bass hole 24 is 1mm, because the aperture of the bass hole 24 exceeds the limit range of the bass push energy, even if the aperture is increased again, the bass hole is not improved any more. When the aperture of the bass hole 24 is in the range of 0.1mm-1mm, the larger the aperture of the bass hole 24 is, the smaller the frequency of the reed 2 vibration is, and the better the quality of bass is. The two bass holes 24 can be uniformly distributed or not on the fixed end 21 of the reed 2, the bass holes 24 are uniformly distributed to ensure that the bass is improved more regularly, and the bass holes 24 are unevenly distributed to ensure that the bass has a plurality of vibration frequencies at the same time, so that the quality of the bass is richer and plump.
As shown in figure 1, four middle-pitch holes 25 are also formed in the reed 2, the middle-pitch holes 25 are distributed in the range of 1/3-2/3 of the length of the reed 2 from the fixed end 21 in the direction of the vertical root side of the reed 2, and the caliber of the middle-pitch holes 25 is larger than the caliber of Gao Yinkong and smaller than the caliber of the bass holes 24. In general, the aperture of the center hole 25 is controlled to be in the range of 0.01mm to 0.1mm, for example, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc., and in this range, the higher the aperture of the center hole 25 tends to be at the intermediate value, the higher the frequency of vibration thereof, the better the center frequency performance is improved, the lower the vibration frequency is, the weaker the effect of improving the center sound thereof is, but the improvement effect is still provided.
The middle or high pitch holes 25, 26 may be uniformly or unevenly distributed on the reed 2. The middle tone holes 25 or the high tone holes 26 are uniformly distributed, the middle tone performance or the high frequency performance of the improved sound is more regular, and the middle tone holes 25 or the high tone holes 26 are unevenly distributed, the middle tone or the high frequency range of the improved sound is wider, and the sound is richer and plump.
The reed 2 is divided into three areas, namely a bass area, a midrange area and a treble area, from the fixed end 21 of the reed 2 along the direction vertical to the root side of the reed 2, wherein the three areas are respectively provided with a bass hole 24, a midrange hole 25 and a Gao Yinkong to change the vibration frequency of the reed 2, further change the low-frequency performance, the medium-frequency performance and the high-frequency performance of the reed 2 vibration, and design the aperture size of each hole to ensure that the apertures of the bass hole 24, the midrange holes 25 and the Gao Yinkong are in an effective range, thereby maximally improving the low-frequency performance, the medium-frequency performance and the high-frequency performance of the reed 2 vibration, improving the bass, the midrange and the tre of the receiver, and making the sound of the receiver better in quality and the sound more graceful and full. One end of the unfilled corner 221 on the suspension end 22, which faces the fixed end 21, is located in the area where the treble hole 26 is located, and under the cooperation of the unfilled corner 221 and Gao Yinkong, the treble performance can be further improved, so that the treble emitted by the receiver is richer and graceful.
The shape of the bass holes 24, the midrange holes 25 and Gao Yinkong is preferably a circular hole, so that the bass holes 24, the midrange holes 25 and Gao Yinkong can be manufactured on the reed 2 conveniently.
As shown in FIG. 2, the thickness of the reed 2 is flush with the thickness of the fixed frame 1, so that the fixed frame 1 and the reed 2 can be conveniently manufactured in an integrated forming manner, and the width of a gap 5 reserved between the reed 2 and other side plates of the fixed frame 1 is generally controlled to be 0.1mm-0.5mm, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm and the like. Preferably, the fixing frame 1 is in the shape of a rectangular frame, and the corresponding floor reed 2 is a rectangular plate, or as shown in fig. 5, the fixing frame 1 is in the shape of a circular frame, and the corresponding floor reed 2 is a circular plate.
The sound membrane 3 is made of elastic metal material, such as beryllium bronze. Or may be a non-metallic material such as plastic.
Corresponding to the gap 5 between the fixed frame 1 and the reed 2, the sound membrane 3 is formed with a corresponding first protrusion along the gap 5, which protrudes towards the fixed surface facing away from the sound membrane 3. For example, the sound membrane 3 is fixed on the bottom surface of the fixed frame 1, and then the first protrusion protrudes downward, below the bottom surface of the fixed frame 1. For another example, when the sound membrane 3 is fixed on the top surface of the fixed frame 1, the first protrusion protrudes upwards, and the two fixing modes of the sound membrane 3 are that the first protrusion is not located in the gap 5, so that the air quantity of the sound membrane 3 is increased, and the sound production of the receiver is changed.
For the material of the fixing frame 1, the material of the fixing frame 1 can be the same as that of the reed 2, for example, the fixing frame 1 and the reed 2 are made of magnetic materials, so that the fixing frame is convenient to be integrally formed, and the structure of the fixing frame 1 and the reed 2 can be prepared only by arranging the gap 5 on the plate.
As shown in fig. 4 and 6, two notches 23 are formed on the side edge of the reed 2 perpendicular to the root side and concave inwards, and the notches 23 change the stiffness, namely the vibration elasticity, of the reed 2, so that the reed 2 is easier to vibrate, and the sensitivity of the reed 2 to vibration is improved. Preferably, the notch 23 is opened at both sides of the fixing portion near the reed 2.
As shown in fig. 4, the fixed end 21 of the reed 2 is provided with an elongated hole 211 extending along the root side, and the elongated hole 211 is arranged to reduce the fixed point between the fixed frame 1 and the reed 2, increase the stiffness of the reed 2, reduce the electromagnetic force required by the reed 2 to vibrate, and thus change the frequency response frequency of the air sounding by the sound membrane 33.
As shown in fig. 7, a metal sheet 6 is provided on a surface of the reed 2 facing away from the sound film 4, and the metal sheet 6 has an elasticity greater than that of the reed 2 and a thickness smaller than that of the reed 2. The metal sheet 6 is preferably made of a non-magnetic material, such as stainless steel, copper, plastic, aluminum, etc., so that the vibration elasticity of the reed is increased, and the reed 2 is easier to vibrate and has better vibration sensitivity.
In the diaphragm mechanism in this embodiment, the area occupied by the unfilled corner 221 at the edge of the reed 2 corresponding to the side edge of the gap is determined according to the required vibration frequency of the reed 2, so as to change the vibration frequency required by high-pitched sound when the reed 2 vibrates, and shift the reed 2 from an air resonance point, thereby improving the high-frequency performance of the receiver. And do not offer any hole on the sound membrane 3, after the sound membrane 3 is fixed on fixed frame 1, sound membrane 3 just can keep apart the sound production cavity in the receiver and the installation cavity, and the gas in two cavities just can not communicate, guarantees the sealing performance of sound production cavity. In addition, the existing reed and the vibrating reed are combined into a whole, a conductive rod is not required to be arranged alone, only the reed 2 is required to be directly driven to vibrate by the electromagnetic driving mechanism, the sound membrane 3 is fixed on the fixed frame 1 in advance before the vibrating diaphragm mechanism is mounted on the telephone receiver, and the vibrating diaphragm mechanism is used as a whole and can be mounted on the shell of the telephone receiver only through the fixed frame 1, so that the mounting process of the telephone receiver is simplified.
Alternatively, the reed 2 may be made of a non-magnetic material, such as beryllium copper, single aluminum, etc., as shown in fig. 2, and a magnet 4, such as a magnet, is disposed on a surface of the reed 2 facing away from the sound membrane 3, and the electromagnetic driving mechanism drives the reed 2 to vibrate to produce sound by driving the magnet 4. The magnets 4 may be one piece or two pieces, or three pieces, etc., and the specific number may be determined according to actual requirements.
As a modification, the shapes of the bass holes 24, the midrange holes 25 and Gao Yinkong may be square holes, tapered holes, or holes of other shapes, such as polygonal holes, and the shapes of the three types of holes may be the same or different, depending on the actual use situation.
Alternatively, the sound membrane 3 may be made of a non-metallic material, such as plastic. As a deformation, the thickness of the reed 2 is smaller than that of the fixing frame 1, and the fixing frame 1 only has to play a role of fixing and supporting, and the smaller the thickness of the reed 2 is, the more easily the reed vibrates.
As an alternative embodiment, the fixing frame 1 and the reed 2 may also have other shapes, for example, the fixing frame 1 is circular, the reed 2 is regular polygon, for example, hexagon, octagon, or quadrangle, or diamond, or trapezoid, etc., and the shapes of the fixing frame 1 and the reed 2 may be designed according to the actual needs of the customer.
As an alternative embodiment, the first projection on the membrane 3 can also be embedded in the gap 5 between the fixed frame 1 and the reed 2. As deformation, the first bulge is not required, and the sound membrane 3 is a tiled membrane, so that the sound membrane 3 is driven to vibrate and sound by air only through elasticity in the process of vibrating the reed 2.
As a variant, the thickness of the reed 2 may also gradually increase from the free end 22 to the fixed end 21 of the reed 2, and under the same electromagnetic driving force, the thinner the free end 22 is, the easier it is to vibrate, the higher the frequency of vibration is, which is beneficial to improving the high-pitched part of the receiver, while the fixed end 21 is large in vibration amplitude, but small in vibration frequency, which is beneficial to improving the low-pitched part thereof. Or the reed 2 is made of different materials so that the elasticity of the suspended end 22 of the reed 2 is greater than that of the fixed end 21 thereof, thereby improving the high-pitched part of the suspended end 22 of the reed 2 and the low-pitched part at the fixed end 21.
As an alternative embodiment, as shown in fig. 6, the material of the fixing frame 1 may be different from that of the reed 2, for example, the reed 2 is a magnetic conductive material, and the fixing frame 1 is an alloy material, for example, stainless steel. At this time, it is necessary to manufacture the reed 2 separately from the fixing frame 1, and finally install the reed 2 in the fixing frame 1, thereby forming a combination of the fixing frame 1 and the reed 2. For example, the fixed end 21 of the reed 2 is formed with a connecting end, and the reed 2 is fixedly connected with the fixed frame 1 by matching the connecting end with a groove formed on the inner wall surface of the fixed frame 1, or at least one connecting piece is independently arranged to connect the fixed end 21 of the reed 2 with the fixed frame 1.
Alternatively, a plurality of notches 23 may be formed on both side walls of the reed 2, for example, three, four, five, etc., or only one notch 23 may be formed on one side wall of the reed 2. As a modification, the side wall surface of the reed 2 may not be provided with the notch 23. As a modification, the above-described elongated hole 211 may not be provided in the fixed end 21.
As an alternative embodiment, the number of the bass holes 24 may be one, three, four, five, etc., and the low-frequency performance of the reed 2 may be changed by only opening at least one bass hole 24 in the bass region of the reed 2. Similarly, the number of the middle sound holes 25 can be one, two, three, five, six, seven and the like, and the reed 2 can be provided with at least one middle sound hole 25 only in the middle sound area, and the number of Gao Yinkong can be one, two, three, four, five, seven, eight and the like, and the reed 2 can be provided with at least one high sound hole 26 only in the high sound area.
Alternatively, the reed 2 may be provided with no middle hole 25, no Gao Yinkong and no middle hole 24, no high hole 26, no low hole 24 and no middle hole 24, or only a low hole 24, no middle hole 25, or no high hole 26. As a further modification, the above-described bass holes 24, midrange holes 25 and Gao Yinkong may not be provided.
Alternatively, the reed 2 may be made of a magnetically conductive material having better stiffness or elasticity to increase the vibration elasticity of the reed without providing the metal sheet 6.
Alternatively, the shape of the unfilled corner 221 may be other shapes, such as a square, pentagon, hexagon, etc., or other irregular pattern.
As a further modification, the shape of the edge of the reed 2 corresponding to the side of the gap 5 may be other shapes besides the unfilled corner, for example, a V-shaped opening formed at the end of the suspended end 22, or an irregular-shaped opening may be formed, and the width of the reed 2 may be reduced to change the high-pitched vibration frequency of the reed, or the shape of the edge of the reed corresponding to the side of the gap may be determined according to the required vibration frequency of the reed 2, only when the length of the reed 2 is kept unchanged.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.