Self-adaptive temperature field device for lithium tantalate single crystal growth

Abstract

The utility model discloses a lithium tantalate single crystal growth self-adaptive temperature field device, which belongs to the technical field of crystal growth equipment and comprises an induction coil and a metal crucible positioned on a middle shaft in the induction coil, a heat preservation cylinder is rotatably arranged on the outer surface of the metal crucible, and an upper cover covering the metal crucible is arranged at the top of the heat preservation cylinder. A seed rod is arranged on a middle shaft in the metal crucible, penetrates through the upper cover and is connected with the upper cover in an up-down sliding manner; a rotating assembly used for achieving rotation of the metal crucible is arranged at the bottom of the metal crucible, a transmission assembly used for achieving rotation of the heat preservation cylinder is arranged on the rotating assembly, and a lifting assembly used for achieving lifting of the rotating assembly is arranged at the bottom of the rotating assembly. Rotation of the metal crucible is achieved through the rotating assembly, convection and temperature distribution of melt are optimized, the uniformity of crystal growth is improved, the transmission assembly and the rotating assembly work in a matched mode, the heat preservation cylinder drives the seed rod to rotate, and the stability of a temperature field is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crystal growth equipment, in particular to a self-adaptive temperature field device for growing lithium tantalate single crystals. Background Art

[0002] Lithium tantalate (LiTaO3) single crystal is an important optoelectronic functional material, widely used in acousto-optic devices, optical modulators, and nonlinear optical devices. However, traditional single crystal growth methods (such as the Czochralski method) have the following technical problems in actual production:

[0003] Currently, temperature field devices generally use induction heating. During induction heating, asymmetric crystal shape is easily caused by asymmetric insulation, which affects the crystal quality. For this reason, we propose an adaptive temperature field device for growing lithium tantalate single crystals. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the utility model provides an adaptive temperature field device for growing lithium tantalate single crystals. The rotating assembly realizes the rotation of the metal crucible, optimizes the convection and temperature distribution of the melt, and improves the uniformity of crystal growth. The transmission assembly works in conjunction with the rotating assembly, so that the insulation cylinder drives the seed crystal rod to rotate, further improving the temperature field stability.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A self-adaptive temperature field device for growing lithium tantalate single crystals comprises an induction coil and a metal crucible located at the center axis of the induction coil. A heat-insulating cylinder is rotatably provided on the outer surface of the metal crucible. An upper cover covering the metal crucible is provided on the top of the heat-insulating cylinder. A seed crystal rod is provided at the center axis of the metal crucible. The seed crystal rod penetrates the upper cover and is connected to the upper cover in an upward and downward sliding manner.

[0007] The bottom of the metal crucible is provided with a rotating assembly for rotating the metal crucible, the rotating assembly is provided with a transmission assembly for rotating the heat preservation cylinder, and the bottom of the rotating assembly is provided with a lifting assembly for lifting the rotating assembly;

[0008] The rotating assembly includes a rotating toothed disc, which is located on the bottom surface of the metal crucible, and the metal crucible is rotated by rotating the rotating toothed disc;

[0009] The transmission assembly includes a ring gear and a gear. The ring gear is coaxially sleeved on the outside of the rotating gear plate. The gear is located between the ring gear and the rotating gear plate and meshes with each other. A connecting rod is provided at the center of the top surface of the gear to be rotatably connected to the bottom surface of the insulation cylinder.

[0010] As a preferred solution of the adaptive temperature field device for growing lithium tantalate single crystals described in the utility model, the rotating component also includes a motor, a positioning cylinder is connected to the center of the bottom surface of the rotating gear disk, a limiting shaft is provided inside the lower end of the positioning cylinder for sliding up and down, and the output shaft of the motor is connected to the bottom end of the limiting shaft.

[0011] As a preferred solution of the adaptive temperature field device for growing lithium tantalate single crystals described in the utility model, the outer surface of the limiting shaft is axially connected with a reinforcing rib, the inner wall of the positioning cylinder is provided with a guide groove corresponding to the reinforcing rib, the reinforcing rib is located inside the guide groove and is connected for up and down sliding, and the reinforcing rib and the guide groove are engaged in the circumferential direction.

[0012] As a preferred solution of the adaptive temperature field device for growing lithium tantalate single crystals described in the utility model, the lifting assembly includes a lifting cylinder and a fixed ring, the fixed ring is rotatably provided with an outer surface of a positioning cylinder, the telescopic end of the lifting cylinder is connected to the fixed ring, and a fixing frame is connected between the bottom surface of the gear ring and the side wall of the fixed ring.

[0013] As a preferred solution of the adaptive temperature field device for growing lithium tantalate single crystals described in the utility model, the bottom surface of the insulation cylinder is provided with a sleeve hole corresponding to the connecting rod, and the connecting rod and the sleeve hole are movably sleeved and rotatably connected to each other.

[0014] As a preferred solution of the adaptive temperature field device for growing lithium tantalate single crystals described in the present invention, the upper and lower ends of the insulation cylinder are sealed and rotatably connected to the outer surface of the metal crucible, and there is a cavity between the insulation cylinder and the metal crucible.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The metal crucible is rotated by the rotating assembly, which optimizes the convection and temperature distribution of the melt and improves the uniformity of crystal growth. The transmission assembly works in conjunction with the rotating assembly to enable the insulation cylinder to drive the seed crystal rod to rotate, further improving the temperature field stability and avoiding crystal defects caused by temperature gradients, supporting the stable growth of high-quality single crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of an adaptive temperature field device for growing lithium tantalate single crystals.

[0018] Figure 2 This is a schematic diagram of the positioning tube of a self-adaptive temperature field device for growing lithium tantalate single crystals.

[0019] Figure 3 This is a schematic diagram of the insulation cylinder of a self-adaptive temperature field device for growing lithium tantalate single crystals.

[0020] Figure 4 Schematic diagram of a rotating gear disk for a self-adaptive temperature field device for growing lithium tantalate single crystals.

[0021] Among them: 1. Induction coil; 2. Metal crucible; 3. Insulation cylinder; 4. Upper cover; 5. Seed crystal rod; 6. Rotating gear disc; 7. Positioning cylinder; 8. Guide groove; 9. Limit shaft; 10. Motor; 11. Reinforcement rib; 12. Lifting cylinder; 13. Gear ring; 14. Fixing ring; 15. Fixing frame; 16. Hole; 17. Gear; 18. Connecting rod. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Example

[0026] Please refer to Figures 1 to 4 As shown, the utility model provides an adaptive temperature field device for growing lithium tantalate single crystals, comprising an induction coil 1 and a metal crucible 2 located at the central axis inside the induction coil 1, a heat preservation cylinder 3 being rotatably provided on the outer surface of the metal crucible 2, a top cover 4 covering the metal crucible 2 being provided on the top of the heat preservation cylinder 3, a seed crystal rod 5 being provided at the central axis inside the metal crucible 2, the seed crystal rod 5 penetrating the upper cover 4 and being connected by sliding up and down;

[0027] A rotating assembly for rotating the metal crucible 2 is provided at the bottom of the metal crucible 2, a transmission assembly for rotating the heat preservation cylinder 3 is provided on the rotating assembly, and a lifting assembly for lifting the rotating assembly is provided at the bottom of the rotating assembly;

[0028] The rotating assembly includes a rotating toothed disc 6, which is located on the bottom surface of the metal crucible 2. The rotation of the metal crucible 2 is achieved by the rotation of the rotating toothed disc 6. The rotating assembly also includes a motor 10. The bottom center of the rotating toothed disc 6 is connected to a positioning cylinder 7. A limit shaft 9 is provided inside the lower end of the positioning cylinder 7 so as to slide up and down. The output shaft of the motor 10 is connected to the bottom end of the limit shaft 9. A reinforcing rib 11 is axially connected to the outer surface of the limit shaft 9. A guide groove 8 is provided on the inner wall of the positioning cylinder 7 corresponding to the reinforcing rib 11. The reinforcing rib 11 is located inside the guide groove 8 and is slidably connected up and down. The reinforcing rib 11 is engaged with the guide groove 8 in the circumferential direction.

[0029] The metal crucible 2 is controlled to rotate by rotating the toothed disc 6, thereby optimizing the flow field and thermal field distribution of the melt, reducing the radial temperature gradient, and the rotational motion optimizes the shape and stability of the solid-liquid interface, reducing the thermal stress inside the crystal, and reducing the formation of cracks and defects;

[0030] The transmission assembly includes a ring gear 13 and a gear 17. The ring gear 13 is coaxially sleeved on the outside of the rotating gear plate 6. The gear 17 is located between the ring gear 13 and the rotating gear plate 6 and meshes with each other. A connecting rod 18 is provided at the center of the top surface of the gear 17 and is rotatably connected to the bottom surface of the insulation cylinder 3.

[0031] The design of the transmission assembly enables the insulation cylinder 3 to rotate synchronously with the crucible, further stabilizing the temperature field. The insulation cylinder 3 drives the seed crystal rod 5 to rotate, and dynamic regulation makes the melt convection more balanced, ensuring the uniformity of crystal composition and improving product quality.

[0032] The lifting assembly includes a lifting cylinder 12 and a fixing ring 14. The fixing ring 14 is rotatably provided with the outer surface of the positioning cylinder 7. The telescopic end of the lifting cylinder 12 is connected to the fixing ring 14. A fixing frame 15 is connected between the bottom surface of the gear ring 13 and the side wall of the fixing ring 14.

[0033] A sleeve hole 16 is provided on the bottom surface of the insulation tube 3 corresponding to the connecting rod 18. The connecting rod 18 and the sleeve hole 16 are movably sleeved and rotatably connected to each other. The upper and lower ends of the insulation tube 3 are sealed and rotatably connected to the outer surface of the metal crucible 2. There is a cavity between the insulation tube 3 and the metal crucible 2.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-adaptive temperature field device for growing lithium tantalate single crystals, comprising an induction coil (1) and a metal crucible (2) located at the center axis of the induction coil (1), characterized in that: A heat-insulating cylinder (3) is rotatably provided on the outer surface of the metal crucible (2); an upper cover (4) covering the metal crucible (2) is provided on the top of the heat-insulating cylinder (3); a seed crystal rod (5) is provided on the inner central axis of the metal crucible (2); the seed crystal rod (5) penetrates the upper cover (4) and is connected by sliding up and down; A rotating assembly for rotating the metal crucible (2) is provided at the bottom of the metal crucible (2), a transmission assembly for rotating the heat-insulating cylinder (3) is provided on the rotating assembly, and a lifting assembly for lifting the rotating assembly is provided at the bottom of the rotating assembly; The rotating assembly comprises a rotating toothed disc (6), wherein the rotating toothed disc (6) is located on the bottom surface of the metal crucible (2), and the rotation of the metal crucible (2) is achieved by the rotation of the rotating toothed disc (6); The transmission assembly comprises a ring gear (13) and a gear (17), wherein the ring gear (13) is coaxially sleeved on the outside of the rotating toothed disc (6), and the gear (17) is located between the ring gear (13) and the rotating toothed disc (6) and meshes with each other. A connecting rod (18) rotatably connected to the bottom surface of the heat preservation cylinder (3) is provided at the center of the top surface of the gear (17).

2. The self-adaptive temperature field device for growing lithium tantalate single crystals according to claim 1, characterized in that: The rotating assembly further comprises a motor (10), a positioning cylinder (7) is connected to the center of the bottom surface of the rotating gear disc (6), a limiting shaft (9) is provided inside the lower end of the positioning cylinder (7) for sliding up and down, and an output shaft of the motor (10) is connected to the bottom end of the limiting shaft (9).

3. The self-adaptive temperature field device for growing lithium tantalate single crystals according to claim 2, characterized in that: The outer surface of the limiting shaft (9) is axially connected with a reinforcing rib (11), and the inner wall of the positioning cylinder (7) is provided with a guide groove (8) corresponding to the reinforcing rib (11). The reinforcing rib (11) is located inside the guide groove (8) and is connected to slide up and down. The reinforcing rib (11) and the guide groove (8) are engaged in a circumferential direction.

4. The self-adaptive temperature field device for growing lithium tantalate single crystals according to claim 1, characterized in that: The lifting assembly comprises a lifting cylinder (12) and a fixing ring (14); the fixing ring (14) is rotatably provided with an outer surface of a positioning cylinder (7); the telescopic end of the lifting cylinder (12) is connected to the fixing ring (14); and a fixing frame (15) is connected between the bottom surface of the gear ring (13) and the side wall of the fixing ring (14).

5. The self-adaptive temperature field device for growing lithium tantalate single crystal according to claim 1, characterized in that: The bottom surface of the heat-insulating cylinder (3) is provided with a sleeve hole (16) corresponding to the connecting rod (18); the connecting rod (18) and the sleeve hole (16) are movably sleeved and rotatably connected to each other.

6. The self-adaptive temperature field device for growing lithium tantalate single crystals according to claim 1, characterized in that: The upper and lower ends of the heat-insulating cylinder (3) are in sealed rotational connection with the outer surface of the metal crucible (2), and a cavity is provided between the heat-insulating cylinder (3) and the metal crucible (2).

Images