A tooling fixture

Abstract

An embodiment of the present invention provides a jig, which relates to the field of semiconductor laser equipment. The jig includes a first clamping part and a second clamping part. The first clamping part includes a first connecting part and a first clamping plate fixedly connected to the first connecting part. The second clamping part includes a second connecting part and a second clamping plate fixedly connected to the second connecting part. The first clamping plate and the second clamping plate are arranged opposite to each other. An adjustment component is connected between the first connecting part and the second connecting part. A sealing ring is provided on the side of the first clamping plate facing the second clamping plate. The present invention can seal the light hole of the shell when other modules are installed in the semiconductor laser, prevent dust from entering the shell, protect the optical fiber assembly from contamination, improve production efficiency, reduce the repair rate of the internal lens of the laser, and reduce costs.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor laser equipment, and in particular to a tooling fixture. Background Art

[0002] Semiconductor lasers have the advantages of small size, light weight, high reliability and low cost, and have been widely used in various fields, such as process processing, laser pumping, medical beauty, automotive radar, etc. The existing fiber coupling method is: laser chip emits light, optical components converge and transmit laser, and optical fiber components couple laser and transmit. Semiconductor lasers include: housing, laser chip, optical components and optical fiber components.

[0003] Research has found that in the prior art, when installing a laser module in a housing, dust easily enters the end of the installed optical fiber assembly, causing the optical fiber assembly to become dirty, requiring the laser pumping lens to be repaired, or even causing the lens to be scrapped, increasing material loss and high costs. Summary of the invention

[0004] The purpose of the present invention includes providing a tooling fixture, which can seal the light hole of the shell during the baking, transfer process, cleaning process of the semiconductor laser module and the installation of other modules, prevent dust in the shell from entering the light hole, protect the optical fiber component from contamination, improve production efficiency, reduce the return rate of the internal lens of the laser, and reduce costs.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides a jig for use in the preparation of a semiconductor laser. The jig comprises a first clamping portion and a second clamping portion. The first clamping portion comprises a first connecting portion and a first clamping plate connected to the first connecting portion. The second clamping portion comprises a second connecting portion and a second clamping plate connected to the second connecting portion. The first clamping plate and the second clamping plate are arranged opposite to each other, an adjustment component is connected between the first connecting portion and the second connecting portion, and the adjustment component is used to adjust the distance between the first clamping portion and the second clamping portion. A sealing ring is arranged on one side of the first clamping plate facing the second clamping plate, so as to seal the light-through hole of the semiconductor laser.

[0007] The sealing ring is embedded in the first clamping plate, and the sealing ring is protrudingly arranged on the surface of the first clamping plate on one side close to the second clamping plate;

[0008] A groove is also provided on one side of the first clamping plate facing the second clamping plate, and the groove is located in the sealing ring. An air inlet and an air outlet connected to the groove are also provided on the first clamping plate.

[0009] In an optional embodiment, the air inlet is provided with a first sealing member, and the air outlet is provided with a second sealing member.

[0010] In an optional embodiment, a guiding mechanism is further provided between the first connecting portion and the second connecting portion.

[0011] In an optional embodiment, the guide mechanism includes a guide column and a guide hole, the guide column is fixedly connected to the second connecting portion, the guide hole is provided on the first connecting portion, and the guide column and the guide hole are slidably matched.

[0012] In an optional embodiment, the adjustment assembly includes a screw, one end of which is threadedly connected to the second connecting part, the other end of which is rotatably connected to the first connecting part, and the second connecting part is provided with a threaded through hole that cooperates with the screw.

[0013] In an optional embodiment, one end of the screw rod close to the second connecting portion extends out of the second connecting portion and is connected to a knob.

[0014] In an optional embodiment, an elastic member is further provided between the first connecting portion and the second connecting portion, and two ends of the elastic member are respectively connected to the first connecting portion and the second connecting portion.

[0015] In an optional embodiment, the first clamping portion further includes a fixing block, and the fixing block is connected to an end of the first clamping plate close to the first connecting portion.

[0016] The beneficial effects of the fixture provided by the embodiment of the present invention include:

[0017] The jig of the present invention is applied to the preparation of a semiconductor laser, and the jig comprises a first clamping portion and a second clamping portion. The first clamping portion comprises a first connecting portion and a first clamping plate fixedly connected to the first connecting portion. The second clamping portion comprises a second connecting portion and a second clamping plate fixedly connected to the second connecting portion. The first clamping plate and the second clamping plate are arranged opposite to each other. An adjustment component is connected between the first connecting portion and the second connecting portion. The adjustment component is used to adjust the distance between the first clamping portion and the second clamping portion. A sealing ring is provided on one side of the first clamping plate facing the second clamping plate, so as to seal the light-through hole of the semiconductor laser.

[0018] The present invention arranges a first clamping plate and a second clamping plate relatively to each other. When the first clamping plate and the second clamping plate are closed, the housing position where the optical fiber assembly is installed can be clamped, and the sealing ring corresponds to the light-through hole of the housing of the semiconductor laser, thereby sealing the light-through hole of the housing. The optical fiber assembly is inserted into the light-through hole from the other side of the housing, and the end of the optical fiber assembly is in the sealed space to prevent the optical fiber assembly from being contaminated. The present invention can seal the light-through hole during the baking, process transfer and cleaning of the semiconductor laser module, prevent dust in the housing from entering the light-through hole, protect the optical fiber assembly from being contaminated, improve production efficiency, reduce the repair rate of the internal lens of the laser, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of the fixture provided in this embodiment from a first viewing angle;

[0021] Figure 2 A schematic diagram of a portion of the structure of the fixture provided in this embodiment from a first viewing angle;

[0022] Figure 3 A schematic diagram of the structure of the fixture provided in this embodiment from a second viewing angle;

[0023] Figure 4 A first cross-sectional view of the fixture provided in this embodiment;

[0024] Figure 5 A second cross-sectional view of the fixture provided in this embodiment.

[0025] Icons: 100-tool fixture; 10-first clamping part; 11-first connecting part; 12-first clamping plate; 13-sealing ring; 14-groove; 15-air inlet; 151-air inlet channel; 152-first sealing member; 16-air outlet; 161-air outlet channel; 162-second sealing member; 17-fixing block; 18-groove; 20-second clamping part; 21-second connecting part; 22-second clamping plate; 30-screw; 31-guide column; 32-elastic member; 33-knob. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] Please refer to Figure 1-Figure 5 The embodiment of the present invention provides a fixture 100, which is used for preparing a semiconductor laser. The semiconductor laser includes: a housing, a laser chip, an optical component and an optical fiber component. The fixture 100 in this embodiment is used to seal the end of the optical fiber component extending into the housing after the optical fiber component is installed on the housing.

[0033] Specifically, a light-through hole is provided on the shell. The optical fiber assembly extends into the light-through hole from the outside of the shell so that the end of the optical fiber assembly is located in the light-through hole. The laser chip and the optical assembly are located in the cavity of the shell, and are used to inject laser into the light-through hole for optical coupling. The fixture 100 in this embodiment is used to clamp the side wall of the shell where the light-through hole is provided after the optical fiber assembly is installed, that is, after the optical fiber assembly is inserted into the light-through hole, so as to seal the light-through hole and prevent the optical fiber assembly from being contaminated. It is understandable that after the optical fiber assembly is contaminated, the laser chip and the lens of the optical assembly need to be repaired, and even the lens may be scrapped, which increases material loss, manpower investment, and cost. The fixture 100 of this embodiment can prevent the optical fiber assembly from being contaminated, thereby reducing the probability of repairing the semiconductor laser and reducing production costs.

[0034] The jig 100 of this embodiment includes a first clamping part 10 and a second clamping part 20. The first clamping part 10 includes a first connecting part 11 and a first clamping plate 12 fixedly connected to the first connecting part 11. The second clamping part 20 includes a second connecting part 21 and a second clamping plate 22 fixedly connected to the second connecting part 21. The first clamping plate 12 and the second clamping plate 22 are arranged opposite to each other. An adjustment component is connected between the first connecting part 11 and the second connecting part 21. The adjustment component is used to adjust the spacing between the first clamping part 10 and the second clamping part 20. A sealing ring 13 is provided on one side of the first clamping plate 12 facing the second clamping plate 22 to seal the light-through hole of the semiconductor laser. The first clamping plate 12 and the second clamping plate 22 are arranged opposite to each other. When the first clamping plate 12 and the second clamping plate 22 are closed, the side wall position of the housing where the light-through hole is opened can be clamped, and the sealing ring 13 corresponds to the light-through hole of the housing, thereby sealing the light-through hole of the housing. The end of the optical fiber assembly is in the light-through hole and is located in the sealed space to prevent the optical fiber assembly from being contaminated.

[0035] In one embodiment, the sealing ring 13 is made of a deformable material such as rubber, silicone, etc. When the first clamping plate 12 contacts the side wall of the housing of the semiconductor laser, the sealing ring 13 can be tightly fitted with the housing at the edge of the light-through hole, preventing dirt such as dust and impurities from entering the light-through hole through the gap between the first clamping plate 12 and the housing of the semiconductor laser, thereby preventing the optical fiber assembly disposed in the light-through hole from being contaminated. Preferably, the sealing ring 13 is made of a material that is not easy to adhere to dust, so as to prevent dirt such as dust and impurities from adhering to the sealing ring 13, thereby ensuring that the optical fiber assembly is not contaminated during the use or removal of the sealing ring 13.

[0036] Optionally, in this embodiment, the sealing ring 13 is circular, and its diameter is larger than the diameter of the light-through hole. In other embodiments, the sealing ring 13 can be square or other shapes, as long as the light-through hole is located in the sealing ring 13 during sealing. The present invention does not limit the shape of the sealing ring 13.

[0037] It should be understood that the present application does not limit the setting position of the sealing ring 13. Technical personnel in this field can reasonably select the setting position of the sealing ring 13 according to the actual application scenario. It is only necessary to ensure that the light-through hole set in the shell of the semiconductor laser can be sealed to achieve the technical effect of avoiding the dirt of the optical fiber component set in the light-through hole.

[0038] In order to further prevent the optical fiber assembly from being contaminated, a groove 14 is further provided on the side of the first clamping plate 12 facing the second clamping plate 22. The groove 14 is located in the sealing ring 13. The first connecting portion 11 is further provided with an air inlet 15 and an air outlet 16 connected to the groove 14. By providing the groove 14 in the sealing ring 13, and providing the air inlet 15 and the air outlet 16 corresponding to the groove 14, gas is blown into the groove 14 through the air inlet 15, and the gas enters the light-through hole through the groove 14. As the flow rate of the blown gas increases, the gas forms a gas circulation in the light-through hole, and the gas circulation takes away dirt such as dust and impurities in the light-through hole and discharges them through the air outlet 16. That is, by providing the groove 14, the air inlet 15 and the air outlet 16, gas can be introduced into the light-through hole of the housing for purging, thereby further preventing the optical fiber assembly from being contaminated.

[0039] The groove 14 is arranged in the sealing ring 13 and corresponds to the light-through hole, so that when air is blown into the groove 14 through the air inlet 15 , the gas can enter the light-through hole through the groove 14 .

[0040] In an optional embodiment, the size of the notch of the groove 14 is not less than the size of the aperture of the light-through hole to ensure the flow rate and flow rate of the gas entering the light-through hole. It should be understood that the present application does not limit the shape of the groove 14, and it is only necessary to ensure that when air is blown into the groove through the air inlet 15, the gas can enter the light-through hole through the groove 14.

[0041] In this embodiment, the first clamping part 10 and the second clamping part 20 are both made of steel. In other embodiments, the first clamping part 10 and the second clamping part 20 may also be made of other materials, such as metal materials such as aluminum, or non-metal materials such as plastic. As long as the first clamping part 10 and the second clamping part 20 can be stably clamped on the housing, the present invention does not limit the material of the fixture 100.

[0042] In this embodiment, the width of the first clamping plate 12 is smaller than the width of the first connecting portion 11. In other embodiments, the width of the first clamping plate 12 may be equal to the width of the first connecting portion 11. As long as the first clamping plate 12 can completely cover the light-through hole of the housing, the present invention is not limited thereto.

[0043] Furthermore, the sealing ring 13 on the first clamping plate 12 protrudes from the surface of the first clamping plate 12 on the side facing the second clamping plate 22. When the first clamping plate 12 and the second clamping plate 22 clamp the side wall of the shell, one side of the second clamping plate 22 abuts against the outer wall of the shell, and the sealing ring 13 first fits against the inner wall of the shell. As the first clamping plate 12 and the second clamping plate 22 gradually close, the gap between the sealing ring 13 and the inner wall of the shell gradually decreases, and finally a tight fit is achieved, which can maximize the sealing performance.

[0044] Furthermore, an air inlet channel 151 is connected between the air inlet 15 and the groove 14. An air outlet channel 161 is connected between the air outlet 16 and the groove 14. The air inlet channel 151 and the air outlet channel 161 are both configured as linear channels, which can prevent dust or impurities from being blocked and retained by the inner wall of the channel during the purging process, and can also enhance the purging effect.

[0045] Optionally, in other embodiments, the air inlet channel 151 and the air outlet channel 161 may also be configured in other shapes. As long as the air inlet and air outlet can be maintained, dust, impurities and other dirt in the light hole can be cleaned by blowing, and the present invention does not limit this.

[0046] In order to prevent the first clamping portion 10 and the second clamping portion 20 from shifting, in this embodiment, a guide column 31 is further provided between the first connecting portion 11 and the second connecting portion 21. One end of the guide column 31 is fixed to the second connecting portion 21. The other end of the guide column 31 is slidably connected to the first connecting portion 11.

[0047] It should be understood that the present application does not limit the connection and matching relationship between the guide column 31 and the first connection part 11. It only needs to ensure that when the first connection part 11 and the second connection part 21 move relative to each other, the movement process of the first connection part 11 or the second connection part 21 can be kept stable and the movement path does not deviate. Those skilled in the art can select a movable connection form such as a threaded connection according to the actual application scenario.

[0048] Specifically, a guide hole is formed on the first connecting portion 11. One end of the guide post 31 is inserted into the guide hole and can move along the axis of the guide hole.

[0049] Optionally, in this embodiment, one end of the guide post 31 is fixed to the second connection portion 21, and the other end is slidably connected to the first connection portion 11. In other embodiments, one end of the guide post 31 may be slidably connected to the second connection portion 21, and the other end may be fixed to the first connection portion 11. As long as the first clamping portion 10 and the second clamping portion 20 can move along the guide post 31, the present invention is not limited thereto.

[0050] In this embodiment, there are two guide posts 31, which are respectively arranged on both sides of the adjustment assembly. In other embodiments, the number of guide posts 31 can be one or more than two. The guide posts 31 can also be arranged in different planes, as long as the first clamping portion 10 and the second clamping portion 20 can move along the guide posts 31, the present invention does not limit this.

[0051] Further, the adjustment assembly includes a screw rod 30. One end of the screw rod 30 is threadedly connected to the second connection portion 21. The other end of the screw rod 30 is rotatably connected to the first connection portion 11. Specifically, the screw rod 30 can be rotatably connected to the first connection portion 11 through a bearing. The second connection portion 21 is provided with a threaded through hole that cooperates with the screw rod 30. It can be understood that by rotating the screw rod 30 in the forward or reverse direction, the first clamping portion 10 and the second clamping portion 20 can be moved closer or farther away.

[0052] Furthermore, in order to facilitate the rotation of the screw rod 30 , one end of the screw rod 30 close to the second connection portion 21 extends out of the second connection portion 21 and is connected to a knob 33 at the end.

[0053] In order to further remove dust, the bottom and side surfaces of the groove 14 are smooth. Specifically, in this embodiment, the first clamping plate 12 is set to a metal material. The bottom and side surfaces of the groove 14 can be polished. It is understood that the surface of the groove 14 is set to a smooth surface to prevent dust from remaining in the groove 14 when the light hole is purged.

[0054] In this embodiment, a first sealing member 152 is provided at the air inlet 15, and a second sealing member 162 is provided at the air outlet 16. It should be noted that in this embodiment, the time for blowing the groove 14 is approximately about 5 seconds. When blowing is not performed, the air inlet 15 and the air outlet 16 need to be sealed to prevent dirt such as dust or impurities from entering the groove 14 through the air inlet 15 / air outlet 16 and contaminating the optical fiber assembly disposed in the light hole. Specifically, the first sealing member 152 and the second sealing member 162 are both sealing rubber covers.

[0055] The first clamping portion 10 also includes a fixing block 17. The fixing block 17 is connected to one end of the first clamping plate 12 near the first connecting portion 11. A groove 18 is provided on the side of the fixing block 17 near the first clamping plate 12. It is understandable that when the height of the shell is inconsistent, the setting of the fixing block 17 can ensure that it abuts against the shell in the height direction and is clamped. The groove 18 is provided on the fixing block 17 to prevent the first clamping portion 10 from abutting against the edges of other components to avoid failure to clamp. It should be understood that the groove 18 is provided on the side of the fixing block 17 near the first clamping plate 12 in the present application in order to adapt to the stepped shell to ensure the adaption and abutment of the fixing block 17 and the shell. In actual applications, those skilled in the art can adaptively adjust the shape of the fixing block 17 according to the structure of the shell to ensure that the fixing block 17 abuts firmly against the shell.

[0056] In this embodiment, an elastic member 32 is further connected between the first connection portion 11 and the second connection portion 21. Specifically, the elastic member 32 is a spring, which is sleeved on the screw rod 30 and the guide column 31. It can be understood that the provision of the elastic member 32 facilitates the reset of the fixture 100; in addition, the provision of the elastic member 32 has a shock-absorbing and buffering function, which is used to absorb the vibration and impact force generated during the relative movement of the first connection portion 11 and the second connection portion 21, thereby improving the damping performance of the screw rod 30 and the guide column 31 and extending the service life of the screw rod 30 and the guide column 31.

[0057] Furthermore, a clearance opening is provided on the second clamping plate 22. It is understandable that the second clamping plate 22 is clamped on the outer wall of the housing, and the position of the clearance opening corresponds to the position of the optical fiber assembly to ensure that the optical fiber assembly can pass through, and avoid the optical fiber assembly being bent and damaged when the fixture 100 is clamped on the housing of the semiconductor laser.

[0058] In summary, the beneficial effects of the jig 100 for preparing a semiconductor laser provided by the embodiment of the present invention are:

[0059] The jig 100 of the present invention is applied to the preparation of a semiconductor laser, and the jig comprises a first clamping portion 10 and a second clamping portion 20. The first clamping portion 10 comprises a first connecting portion 11 and a first clamping plate 12 fixedly connected to the first connecting portion 11. The second clamping portion 20 comprises a second connecting portion 21 and a second clamping plate 22 fixedly connected to the second connecting portion 21. The first clamping plate 12 and the second clamping plate 22 are arranged opposite to each other. An adjustment component is connected between the first connecting portion 11 and the second connecting portion 21. The adjustment component is used to adjust the distance between the first clamping portion 10 and the second clamping portion 20. A sealing ring 13 is provided on the side of the first clamping plate 12 facing the second clamping plate 22. A groove 14 is also provided on the side of the first clamping plate 12 facing the second clamping plate 22. The groove 14 is located in the sealing ring 13. An air inlet 15 and an air outlet 16 connected to the groove 14 are also provided on the first connecting portion 11 to seal the light-through hole of the semiconductor laser.

[0060] The present invention arranges the first clamping plate 12 and the second clamping plate 22 relatively. When the first clamping plate 12 and the second clamping plate 22 are closed, the housing position where the optical fiber assembly is installed can be clamped, and the sealing ring 13 corresponds to the light-through hole of the housing of the semiconductor laser, thereby sealing the light-through hole of the housing. The optical fiber assembly is inserted into the light-through hole from the other side of the housing, and the end of the optical fiber assembly is in the sealed space to prevent the optical fiber assembly from being contaminated. The present invention can seal the light-through hole during the baking, transfer and cleaning processes of the semiconductor laser module, prevent dust in the housing from entering the light-through hole, protect the optical fiber assembly from contamination, improve production efficiency, reduce the repair rate of the internal lens of the laser, and reduce costs.

[0061] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A fixture, characterized in that: Applied to the preparation of semiconductor lasers, the fixture comprises: a first clamping part and a second clamping part; The first clamping portion includes a first connecting portion and a first clamping plate connected to the first connecting portion; The second clamping portion includes a second connecting portion and a second clamping plate connected to the second connecting portion; The first clamping plate and the second clamping plate are arranged opposite to each other; An adjustment component is connected between the first connecting portion and the second connecting portion, so as to adjust the distance between the first clamping portion and the second clamping portion; A sealing ring is provided on one side of the first clamping plate facing the second clamping plate, so as to seal the light-through hole of the semiconductor laser; The sealing ring is embedded in the first clamping plate, and the sealing ring is protrudingly arranged on the surface of the first clamping plate on one side close to the second clamping plate; A groove is also provided on one side of the first clamping plate facing the second clamping plate, the groove is located in the sealing ring, and an air inlet and an air outlet connected to the groove are also provided on the first clamping plate; When the first clamping plate and the second clamping plate are closed, the side wall position of the light-through hole of the housing of the semiconductor laser can be clamped, and the sealing ring corresponds to the light-through hole of the housing, thereby sealing the light-through hole.

2. The fixture according to claim 1, characterized in that: The air inlet is provided with a first sealing member, and the air outlet is provided with a second sealing member.

3. The fixture according to claim 1, characterized in that: A guiding mechanism is also provided between the first connecting portion and the second connecting portion.

4. The fixture according to claim 3, characterized in that: The guide mechanism comprises a guide column and a guide hole, wherein the guide column is fixedly connected to the second connecting portion, the guide hole is provided on the first connecting portion, and the guide column and the guide hole are slidably matched.

5. The fixture according to claim 1, characterized in that: The adjustment assembly includes a screw rod, one end of which is threadedly connected to the second connecting portion, the other end of which is rotatably connected to the first connecting portion, and the second connecting portion is provided with a threaded through hole that matches the screw rod.

6. The fixture according to claim 5, characterized in that: One end of the screw rod close to the second connection part extends out of the second connection part and is connected to a knob.

7. The fixture according to claim 1, characterized in that: An elastic member is further provided between the first connection portion and the second connection portion, and two ends of the elastic member are respectively connected to the first connection portion and the second connection portion.

8. The fixture according to claim 1, characterized in that: The first clamping portion further includes a fixing block connected to an end of the first clamping plate close to the first connecting portion.

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