Seed crystal cleaning rack

Abstract

The seed crystal cleaning frame is used for being placed in a cleaning liquid tank for cleaning seed crystals, the seed crystal cleaning frame comprises a frame body and a seed crystal placing unit, the seed crystal placing unit comprises a plurality of clamping pieces and limiting holes, the clamping pieces are used for clamping cap parts of the seed crystals from the side of the cap parts of the seed crystals in a point contact or line contact mode, and the limiting holes are used for limiting the clamping pieces. The limiting hole is used for allowing the rod part of the seed crystal to pass through along the vertical direction without contacting with the wall of the limiting hole and enabling the seeding end of the rod part to be exposed downwards. Therefore, the contact area with the seed crystal can be reduced, and the sufficiency of the seed crystal during corrosion is improved; the uniformity of the seed crystal during corrosion can be ensured; and the adjacent seed crystals can be prevented from being collided with each other.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of crystal growth, and more particularly to a seed cleaning rack. BACKGROUND

[0002] In crystal growth, especially in crystal growth by the Czochralski method, a seed crystal is usually used to initiate the growth of the crystal.

[0003] Before being installed on a seed holder, the seed crystal needs to be cleaned (i.e. etched) to ensure that the surface of the seed crystal, especially the seed end of the seed crystal, is clean.

[0004] Patent document CN214736104U discloses a seed cleaning device applied to growth of germanium single crystals.

[0005] The seed cleaning device is placed into a cleaning vessel, and the seed cleaning device has a frame body, opposite side plates of the frame body are provided with limiting grooves, and the seed crystal is horizontally placed in the two limiting grooves spaced apart along the axial direction of the seed crystal to support the seed crystal from below. The projection of each limiting groove on the horizontal axial direction is a circular arc and has a certain width in the horizontal axial direction, so the contact between each limiting groove and the seed crystal is surface contact, and the contact place is not fully etched during etching.

[0006] In addition, because the projection of each limiting groove on the horizontal axial direction is a circular arc, the seed crystal will rotate around the axis of the seed crystal (i.e. circumferential rotation), and because the two limiting grooves spaced apart along the axial direction of the seed crystal do not limit the seed crystal in the axial direction, the seed crystal will translate in the axial direction. Thus, the seed crystal is not fixed on the frame body. In this way, the seed crystal has a certain moving space, and when the seed cleaning device is transported or subjected to vibration from the outside, the seed crystal moves, the seed crystal becomes unstable on the frame body, the uniformity of the seed crystal etching is affected, and when the movement is large, there is a risk of collision between adjacent seed crystals. SUMMARY

[0007] In view of the problems in the background art, an object of the present disclosure is to provide a seed cleaning rack which can reduce the contact area with the seed crystal and increase the fullness of the seed crystal during etching.

[0008] Another object of the present disclosure is to provide a seed cleaning rack which can ensure the uniformity of the seed crystal during etching.

[0009] Still another object of the present disclosure is to provide a seed cleaning rack which can prevent adjacent seed crystals from colliding.

[0010] Thus, a seed crystal washing rack for placing into a cleaning liquid tank for cleaning a seed crystal includes a rack body and a seed crystal placing unit, the seed crystal placing unit including a plurality of clamping members for clamping a cap portion of the seed crystal from a side of the cap portion in point contact or line contact and a limiting hole for allowing a stem portion of the seed crystal to pass through in an up-and-down direction without contacting a wall of the limiting hole and allowing a seed crystal drawing end of the stem portion to be exposed downward.

[0011] Advantages of the present disclosure are as follows.

[0012] In the seed crystal washing rack according to the present disclosure, because the plurality of clamping members are used to clamp the cap portion of the seed crystal from the side of the cap portion in point contact or line contact, the point contact or line contact has much smaller contact area than the surface contact of the prior art patent document, so the point contact or line contact portion is corroded more fully than the prior art patent document during the cleaning (i.e. corrosion) in the cleaning liquid tank. In other words, the seed crystal washing rack according to the present disclosure can reduce the contact area with the seed crystal and increase the fullness of the seed crystal when corroded.

[0013] In the seed crystal washing rack according to the present disclosure, because the plurality of clamping members are used to clamp the cap portion of the seed crystal from the side of the cap portion in point contact or line contact and the limiting hole is used to allow the stem portion of the seed crystal to pass through in the up-and-down direction without contacting the wall of the limiting hole and allow the seed crystal drawing end of the stem portion to be exposed downward, the seed crystal is fixed in an upright posture in the seed crystal washing rack, so each seed crystal is limited to move, even when the seed crystal washing rack is transported or subjected to vibration from the outside, the state of the seed crystal on the seed crystal washing rack is stable, thereby being able to ensure the uniformity of the seed crystal when corroded.

[0014] In the seed crystal washing rack according to the present disclosure, by the clamping of the plurality of clamping members and the limiting of the limiting hole, even when the seed crystal washing rack is transported or subjected to vibration from the outside, the adjacent seed crystals placed on the seed crystal washing rack can not have the risk of bumping. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of a seed crystal washing rack according to the present disclosure, in which a seed crystal is not placed on the seed crystal washing rack.

[0016] Figure 2 is a working view of the seed crystal washing rack of Figure 1 , in which one seed crystal is placed on the seed crystal washing rack, and the seed crystal washing rack is placed in a cleaning liquid tank.

[0017] Figure 3 is a modification of Figure 2 .

[0018] Figure 4This is an example of a seed crystal. The image on the left is a top-down perspective, the image in the middle is a bottom-up perspective, and the image on the right is a top-down perspective.

[0019] Figure 5 This is another example of a seed crystal. The image on the left is a top-down perspective, the image in the middle is a bottom-up perspective, and the image on the right is a top-down perspective.

[0020] Figure 6 This is another example of a seed crystal. The image on the left is a top-down 3D view, the image in the middle is a bottom-up 3D view, and the image on the right is a top-down view.

[0021] The reference numerals in the attached figures are explained below.

[0022] 100 Seed Crystal Cleaning Rack with 24 Support Components

[0023] D1 up and down direction 3 upper plate

[0024] D2 Front and rear directions 4 lower plates

[0025] D3 Left and right directions 5 handles

[0026] 1 frame, 200 cleaning fluid tank

[0027] 2 seed crystal placement units, 300 seed crystals

[0028] 21 Clamping Part 300a Cap

[0029] 21a Arc-shaped guide surface 300b Rod section

[0030] 22 limiting holes 300c lead terminal

[0031] 23 vias Detailed Implementation

[0032] The accompanying drawings illustrate embodiments of this disclosure, and it will be understood that the disclosed embodiments are merely examples of this disclosure, which can be implemented in various forms. Therefore, the specific details disclosed herein should not be construed as limiting, but are intended only as the basis for the claims and as an illustrative basis to teach those skilled in the art how to implement this disclosure in various ways.

[0033] Reference Figures 1 to 6 According to this disclosure, the seed crystal cleaning rack 100 is used to place the seed crystal 300 in the cleaning liquid tank 200.

[0034] The seed crystal cleaning rack 100 comprises a rack body 1 and a seed crystal placing unit 2. The seed crystal placing unit 2 comprises a plurality of clamping members 21 for clamping the cap portion 300a of the seed crystal 300 from the side with point or line contact, and a limiting hole 22 for the stem portion 300b of the seed crystal 300 to pass through the limiting hole 22 without contacting the wall of the limiting hole 22 in the up-down direction D1, and the seed crystal 300 is exposed with the seed crystal end 300c downward.

[0035] In the seed crystal cleaning rack 100 according to the present disclosure, because the plurality of clamping members 21 are used to clamp the cap portion 300a of the seed crystal 300 from the side with point or line contact, the contact area is much smaller than the surface contact in the prior art patent document, so the point or line contact is corroded more fully during the cleaning (i.e. corrosion) in the cleaning liquid tank 200. In other words, the seed crystal cleaning rack 100 according to the present disclosure can reduce the contact area with the seed crystal 300 and increase the fullness of the seed crystal 300 during corrosion.

[0036] In the seed crystal cleaning rack 100 according to the present disclosure, because the plurality of clamping members 21 are used to clamp the cap portion 300a of the seed crystal 300 from the side with point or line contact, and the limiting hole 22 is used for the stem portion 300b of the seed crystal 300 to pass through the limiting hole 22 without contacting the wall of the limiting hole 22 in the up-down direction D1, and the seed crystal end 300c is exposed downward, the seed crystal 300 is fixed in an upright position in the seed crystal cleaning rack 100, so that each seed crystal 300 is limited to move, and even when the seed crystal cleaning rack 100 is transported or subjected to vibration from the outside, the state of the seed crystal 300 on the seed crystal cleaning rack 100 is stable, thereby ensuring the uniformity of the seed crystal 300 during corrosion.

[0037] In the seed crystal cleaning rack 100 according to the present disclosure, through the clamping of the plurality of clamping members 21 and the limiting of the limiting hole 22, even when the seed crystal cleaning rack 100 is transported or subjected to vibration from the outside, the adjacent seed crystals 300 placed on the seed crystal cleaning rack 100 can not be at risk of bumping.

[0038] In order to increase the flowability of the cleaning liquid in the cleaning liquid tank 200 and facilitate the observation of the operator, in the example of Figures 1 to 3 In the example of the rack body 1 being hollow in the six sides of up, down, left, right, front and back, in addition, the hollow structure also saves the material usage and reduces the overall weight of the rack body 1.

[0039] The clamping member 21 can be any suitable structure. For example, the clamping member 21 with point contact is spherical or hemispherical (see Figure 3The clamping member 21 above the seed crystal placement unit 2 in the lower right corner); the clamping member 21 with line contact is either entirely cylindrical or partially cylindrical (see Figure 3 (The left clamping member 21 in the seed crystal placement unit 2 at the lower right), or the pyramid (see Figures 1 to 3 ).

[0040] To facilitate the insertion of the cap 300a of the seed crystal 300 into the multiple clamping members 21, Figures 1 to 3 In the example shown, the top of the clamp 21 that is in line contact has an arc-shaped guide surface 21a.

[0041] In the seed crystal placement unit 2, the number and layout of the multiple clamping members 21 can be flexibly selected. For example... Figure 1 and Figure 2 As shown, the plurality of clamping members 21 are two or more and are arranged at equal intervals of 360 degrees within a horizontal plane formed by the front-back direction D2 and the left-right direction D3. In an example not shown, the plurality of clamping members 21 are three, and the three clamping members 21 are used to clamp the seed crystal 300 from the circular cap portion 300a (see reference). Figure 6 The circular cap 300a of the seed crystal 300 is clamped on the side by point contact or line contact. Figure 3 In the example, there are four clamping members 21, which are used to clamp the rectangular part of the seed crystal 300 (see reference). Figure 4 square and Figure 5 The rectangular cap 300a of the seed crystal 300 is clamped by point contact or line contact on the front, back, left and right sides of the cap 300a.

[0042] In addition, such as Figures 1 to 3 As shown, the seed crystal placement unit 2 also includes a through hole 23 and multiple support members 24. The through hole 23 allows the stem portion 300b of the seed crystal 300 to pass through without contacting the wall of the through hole 23 in the vertical direction D1. The multiple support members 24 are distributed around the through hole 23 and form a support horizontal surface located in the horizontal plane formed by the front-back direction D2 and the left-right direction D3, which is composed of discrete line supports or point supports. The support horizontal surface is used to support the bottom side of the cap portion 300a of the seed crystal 300 from below. Similarly, the discrete line supports or point supports have a much smaller contact area compared with the prior art patent documents, and the discrete line supports or point supports will be corroded more thoroughly compared with the prior art patent documents. That is to say, the seed crystal cleaning rack 100 according to this disclosure can reduce the contact area with the seed crystal 300 and increase the thoroughness of the seed crystal 300 during corrosion.

[0043] Specifically, the support member 24 is hemispherical (e.g., Figure 3 The multiple supports 24 in the seed crystal placement unit 2 at the upper left are shown) or cylindrical, or partially cylindrical (such as Figures 1 to 3 (As shown).

[0044] Further, in Figures 1 to 3 the example, the seed crystal cleaning rack 100 comprises an upper plate 3 and a lower plate 4 spaced apart from each other in the up-down direction D1, the left and right ends of the upper plate 3 are respectively connected to the frame body 1, and the left and right ends of the lower plate 4 are respectively connected to the frame body 1; the seed crystal placing units 2 are arranged in multiple, the multiple clamping pieces 21, the through holes 23 and the multiple support pieces 24 of each seed crystal placing unit 2 are arranged on the upper surface of the upper plate 3, and the limiting holes 22 of each seed crystal 300 unit are arranged on the upper surface of the lower plate 4.

[0045] In order to improve the cleaning (i.e. corrosion) efficiency, as shown in Figures 1 to 3 the upper plate 3 is multiple, and the multiple upper plates 3 are arranged in the front-rear direction D2; the lower plate 4 is multiple, and the multiple lower plates 4 are arranged in the front-rear direction D2.

[0046] In order to facilitate the taking and placing of the seed crystal placing units 2, as shown in Figures 1 to 3 the seed crystal cleaning rack 100 comprises two handles 5, and the two handles 5 are respectively arranged on the left and right sides of the top of the frame body, and the heights of the two handles 5 are set to be higher than the liquid level of the cleaning liquid in the cleaning liquid tank 200 for the operator to hold with both hands. The heights of the two handles 5 are set to be higher than the liquid level of the cleaning liquid in the cleaning liquid tank 200 can also ensure that the operator's hands will not come into contact with the cleaning liquid (i.e. corrosion liquid), improving the safety of the operator.

[0047] Note that the seed crystal 300 applicable to the seed crystal cleaning rack 100 is not only applicable to the seed crystal for growing crystals by the Czochralski method of germanium material, but also applicable to seed crystals of other materials with the same or similar shape.

[0048] A number of exemplary embodiments are described above with the detail description, but this document is not intended to limit to the explicitly disclosed combinations. Therefore, unless otherwise stated, various features disclosed herein can be combined together to form a number of additional combinations which are not shown for the purpose of simplicity.

Claims

1. A seed cleaning rack for placing into a cleaning liquid tank (200) for cleaning a seed (300), characterized in that, the seed cleaning rack (100) comprises a rack body (1) and a seed placing unit (2), the seed placing unit (2) comprises a plurality of clamping members (21) for clamping a cap portion (300a) of the seed (300) from the side with point or line contact, and a limiting hole (22) for the stem portion (300b) of the seed (300) to pass through without contacting the wall of the limiting hole (22) in the up-down direction (D1) and expose the seed crystal leading end (300c) of the stem portion (300b) downward. 2.The seed cleaning rack according to claim 1, characterized in that, the rack body (1) is hollow in six sides of up-down, left-right, front-back. 3.The seed cleaning rack according to claim 1, characterized in that, the clamping member (21) with point contact is spherical or semi-spherical; the clamping member (21) with line contact is a whole cylinder, a partial cylinder, or a pyramid. 4.The seed cleaning rack according to claim 1, characterized in that, the top end of the clamping member (21) with line contact is provided with an arc-shaped guide surface (21a). 5.The seed cleaning rack according to claim 1, characterized in that, the plurality of clamping members (21) are more than two and are arranged in 360-degree intervals in the horizontal plane formed by the front-back direction (D2) and the left-right direction (D3). 6.The seed cleaning rack according to claim 5, characterized in that, the plurality of clamping members (21) are three, and the three clamping members (21) are used to clamp the cap portion (300a) of the seed (300) from the side with point or line contact; or the plurality of clamping members (21) are four, and the four clamping members (21) are used to clamp the cap portion (300a) of the seed (300) from the side with point or line contact. 7.The seed cleaning rack according to claim 1, characterized in that, the seed placing unit (2) further comprises a through hole (23) for the stem portion (300b) of the seed (300) to pass through without contacting the wall of the through hole (23) in the up-down direction (D1), and a plurality of support members (24) distributed around the through hole (23) and forming a support horizontal plane in the horizontal plane formed by the front-back direction (D2) and the left-right direction (D3), the support horizontal plane is used to support the bottom side of the cap portion (300a) of the seed (300) from below. 8.The seed cleaning rack according to claim 7, characterized in that, the support member (24) is semi-spherical or cylindrical, or partial cylindrical. 9.The seed cleaning rack according to claim 7, characterized in that, The seed crystal cleaning rack (100) comprises an upper plate (3) and a lower plate (4) spaced apart from each other in the up-down direction (D1), the left and right ends of the upper plate (3) are respectively connected to the frame body (1), and the left and right ends of the lower plate (4) are respectively connected to the frame body (1); The seed crystal placing units (2) are arranged in multiple, the multiple clamping pieces (21), the via holes (23) and the multiple supporting pieces (24) of each seed crystal placing unit (2) are arranged on the upper surface of the upper plate (3), and the limiting holes (22) of each seed crystal (300) unit are arranged on the upper surface of the lower plate (4).

10. The seed crystal cleaning rack according to claim 1, wherein, The seed crystal cleaning rack (100) comprises two handles (5), the two handles (5) are respectively arranged on the left and right sides of the top of the frame body, and the heights of the two handles (5) are arranged to be higher than the liquid level of the cleaning liquid in the cleaning liquid tank (200) for the operator to hold with both hands.

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