An optical fiber positioning unit and a limiting device thereof for a spectral astronomical telescope

Abstract

The present invention discloses an optical fiber positioning unit and a limiting device for a spectral astronomical telescope, comprising a fixed sleeve rotatably sleeved on a central rotating shaft, an annular gap formed between the central rotating shaft and the fixed sleeve, and an intermediate rotating sleeve sleeved in the annular gap and capable of freely rotating in the annular gap; a moving contact is fixedly arranged on the central rotating shaft, a stationary contact is fixedly arranged on the fixed sleeve, and an intermediate contact is fixedly arranged on the intermediate rotating sleeve; the moving contact, the stationary contact and the intermediate contact are all located in the annular gap, the moving contact and the stationary contact have a preset gap along the axial direction of the central rotating shaft, the moving contact and the intermediate contact have an overlapping portion along the axial direction of the central rotating shaft, and the intermediate contact can abut against the stationary contact when it rotates to a preset position. The limiting device avoids the problem of optical fiber breakage caused by the loss of control of the central rotating motor.

Description

Technical Field

[0001] The invention relates to the technical field of spectral astronomical telescopes, and in particular to an optical fiber positioning unit and a limiting device thereof for a spectral astronomical telescope. Background Art

[0002] At present, large focal plane spectral survey telescopes (such as my country's LAMOST) all use focal plane partitioning on the focal plane. A dual-degree-of-freedom fiber positioning unit is installed in each cell, using a dual-rotation motion mechanism (such as patent CN2344786). Figure 1 As shown. It includes a central rotating shaft 1 and an eccentric rotating shaft 2 of equal length. Both rotating shafts are driven by a stepper motor after being decelerated by a reducer. Their movement enables the fiber end to reach any position in a circle with a diameter of 33 mm. The computer sends a stepper motor drive pulse to the drive circuit to control the movement of both rotating shafts. A total of 4,000 identical optical fiber units are installed on the entire LAMOST focal plane, so that when the unit drives the fiber end to position, it moves on a small circular plane perpendicular to the unit axis.

[0003] The double-rotation motion mechanism is generally composed of a central rotating part, an eccentric rotating part and a fiber rack. The central rotating part drives the central axis to rotate through the central motor; the eccentric rotating part drives the eccentric axis to rotate through the eccentric motor. In this way, the fiber rack is driven to position the fiber end face in a small circle area on a plane through these two rotations. According to the requirements of the fiber positioning principle, the unit center axis needs to rotate 360 ​​degrees to ensure that the fiber can be positioned in any direction of the small circle, but this rotation must be guaranteed not to be out of control, otherwise if for some reason (such as motor phase loss) the center rotation will continue to rotate uncontrollably and not stop in time, it will cause the central rotating part and the fiber to be entangled, resulting in serious consequences such as fiber breakage.

[0004] In summary, how to solve the problem that the optical fiber is easily broken when the center rotation of the optical fiber positioning unit of the spectral astronomical telescope is out of control has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0005] The purpose of the present invention is to provide an optical fiber positioning unit and a limiting device thereof for a spectroscopic astronomical telescope, so as to solve the problem that the optical fiber is easily broken when the center rotation of the optical fiber positioning unit of the spectroscopic astronomical telescope is out of control.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a limiting device for an optical fiber positioning unit of a spectroscopic astronomical telescope, comprising a fixed sleeve rotatably sleeved on a central rotating shaft, an annular gap formed between the central rotating shaft and the fixed sleeve, and an intermediate rotating sleeve sleeved in the annular gap and capable of freely rotating in the annular gap; a moving contact is fixedly arranged on the central rotating shaft, a stationary contact is fixedly arranged on the fixed sleeve, and an intermediate contact is fixedly arranged on the intermediate rotating sleeve, the moving contact, the stationary contact and the intermediate contact are all located in the annular gap, the moving contact and the stationary contact have a preset gap along the axial direction of the central rotating shaft, the moving contact and the intermediate contact have an overlapping portion along the axial direction of the central rotating shaft, and the intermediate contact can abut against the stationary contact when it rotates to a preset position; and the sum of the radiation occupied angles of the two ends of the moving contact, the two ends of the stationary contact and the two ends of the intermediate contact relative to the central rotating shaft does not exceed 360°.

[0007] Preferably, the moving contact includes a return-to-zero moving contact and a positive rotating contact, the return-to-zero moving contact and the positive rotating contact are located on the same side of the intermediate contact, and the static contact is grounded, the return-to-zero moving contact and the positive rotating contact are respectively connected to their own high-level signals, and the intermediate contact is a conductor. When the driving circuit of the central motor used to drive the central rotating shaft receives a low-level signal from the return-to-zero moving contact or the positive rotating contact, the driving circuit stops sending the driving signal and the central motor stops rotating.

[0008] Preferably, a fixing ring is fixedly provided on the central rotating shaft, and the moving contact is fixed on the fixing ring.

[0009] Preferably, the fixing ring is fixed on the central rotating shaft by pins.

[0010] Preferably, the stationary contact is a columnar body with a semicircular ring-shaped cross section.

[0011] Preferably, the stationary contact is fixed to the fixing sleeve by means of screws.

[0012] Preferably, a planetary internal gear is fixedly disposed on the fixed sleeve, and a pinion gear meshing with the planetary internal gear is disposed on a motor shaft for driving a central motor on the central rotating shaft.

[0013] Preferably, a central backlash eliminating spring arranged axially for eliminating the gap between the gears is also provided in the annular gap.

[0014] Preferably, one end of the intermediate rotating sleeve is axially limited to the end surface of the static contact, and the other end of the intermediate rotating sleeve is provided with an axial limiting portion, and the axial limiting portion is fixed on the central rotating shaft.

[0015] Compared with the background technology introduction, the above-mentioned limiting device of the optical fiber positioning unit for the spectral astronomical telescope includes a fixed sleeve rotatably mounted on the central rotating shaft, an annular gap formed between the central rotating shaft and the fixed sleeve, and an intermediate rotating sleeve mounted in the annular gap and capable of freely rotating in the annular gap; a moving contact is fixedly arranged on the central rotating shaft, a static contact is fixedly arranged on the fixed sleeve, and an intermediate contact is fixedly arranged on the intermediate rotating sleeve; the moving contact, the static contact and the intermediate contact are all located in the annular gap, the moving contact and the static contact have a preset gap along the axial direction of the central rotating shaft, the moving contact and the intermediate contact have an overlapping portion along the axial direction of the central rotating shaft, and the intermediate contact can be against the static contact when it rotates to a preset position; and the sum of the radiation occupied angles of the two ends of the moving contact, the two ends of the static contact and the two ends of the intermediate contact relative to the central rotating shaft does not exceed 360°. In the actual working process of the limit device, after the moving contact on the central rotating shaft rotates (either forward or reverse) until it contacts the intermediate contact, the moving contact and the static contact have a preset gap along the axial direction of the central rotating shaft, so the two will not directly interfere with each other, and the moving contact and the intermediate contact have an overlapping portion along the axial direction of the central rotating shaft, so the moving contact can drive the intermediate rotating sleeve to rotate after contacting the intermediate contact, and when the intermediate contact contacts the static contact, it is limited and cannot continue to rotate, thereby ensuring that the rotation angle of the central rotating shaft is always controlled within the predetermined rotation angle, avoiding the problem of optical fiber breakage caused by the loss of control of the central rotating motor. In addition, since the sum of the radiation occupied angles of the two ends of the moving contact, the two ends of the static contact, and the two ends of the intermediate contact relative to the central rotating shaft does not exceed 360°, it can ensure that the rotation of the central rotating shaft can rotate at least 360°.

[0016] In addition, the present invention also provides an optical fiber positioning unit for a spectroscopic astronomical telescope, including a limiting device, which is the limiting device described in any of the above schemes. Since the above limiting device has the above technical effects, the optical fiber positioning unit for a spectroscopic astronomical telescope having the above limiting device should also have corresponding technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the working principle of the existing double rotary motion mechanism;

[0018] Figure 2 A schematic diagram of the overall structure of an optical fiber positioning unit for a spectroscopic astronomical telescope provided by an embodiment of the present invention;

[0019] Figure 3 A schematic cross-sectional view of a position limiting device provided in an embodiment of the present invention;

[0020] Figure 4 for Figure 3 AA cross-sectional structural diagram of (the moving contact and the middle contact are not in contact at the position shown);

[0021] Figure 5 A schematic diagram of the position of the moving contact when the central rotary shaft according to an embodiment of the present invention rotates forward to the limit position;

[0022] Figure 6 A schematic diagram of the position of the moving contact disengaging from the middle contact during the center rotary shaft returning to zero provided by an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the position of the moving contact in contact with the other side of the intermediate contact during the process of returning the center rotary shaft to zero provided by an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of a moving contact driving an intermediate contact to return to zero position during a process of returning a central rotary shaft to zero provided in an embodiment of the present invention.

[0025] superior Figure 1-Figure 8 middle,

[0026] Center rotating shaft 1, eccentric rotating shaft 2, fixed sleeve 3, annular gap 4, intermediate rotating sleeve 5, moving contact 6, static contact 7, intermediate contact 8, return to zero moving contact 9, positive rotating contact 10, center motor 11, fixed ring 12, center anti-backlash spring 13, axial limiting part 14, center rotating part 15, eccentric rotating part 16, optical fiber rack 17, limiting device 18, eccentric motor 19, eccentric anti-backlash spring 20, screw 21. DETAILED DESCRIPTION

[0027] The core of the present invention is to provide an optical fiber positioning unit and a limiting device thereof for a spectroscopic astronomical telescope, so as to solve the problem that the optical fiber is easily broken when the center rotation of the optical fiber positioning unit of the spectroscopic astronomical telescope is out of control.

[0028] In order to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 2-Figure 8As shown, a limiting device for an optical fiber positioning unit of a spectroscopic astronomical telescope provided by an embodiment of the present invention comprises a fixed sleeve 3 rotatably sleeved on a central rotating shaft 1, an annular gap 4 formed between the central rotating shaft 1 and the fixed sleeve 3, and an intermediate rotating sleeve 5 sleeved in the annular gap 4 and capable of freely rotating in the annular gap 4; a moving contact 6 is fixedly arranged on the central rotating shaft 1, a stationary contact 7 is fixedly arranged on the fixed sleeve 3, and an intermediate contact 8 is fixedly arranged on the intermediate rotating sleeve 5; the moving contact 6, the stationary contact 7 and the intermediate contact 8 are all located in the annular gap, and the moving contact 6 and the stationary contact 7 have a preset gap along the axial direction of the central rotating shaft 1 (it needs to be said here that the moving contact 6 and the stationary contact 7 have a preset gap). It is clear that, generally speaking, the preset gap needs to be designed to be a smaller preset gap value, such as 0.1mm. Because the gap between the moving contact and the static contact along the axial direction of the central rotating shaft is small enough, when the moving contact contacts the static contact through the intermediate contact, their contact points are almost on a straight line, so that the "Abbe principle" can be basically satisfied, greatly reducing the zero return principle error), the moving contact 6 and the intermediate contact 8 have an overlapping portion along the axial direction of the central rotating shaft 1, and the intermediate contact 8 can be against the static contact 7 when it rotates to the preset position; and the sum of the radiation occupation angles of the moving contact 6, the static contact 7 and the intermediate contact 8 relative to the central rotating shaft 1 does not exceed 360°.

[0030] In actual operation, the limit device rotates the moving contact on the central rotating shaft (either forward or reverse) until it contacts the intermediate contact. Since the moving contact and the static contact have a preset gap along the axial direction of the central rotating shaft, the two will not directly interfere with each other. The moving contact and the intermediate contact have an overlapping portion along the axial direction of the central rotating shaft. Therefore, after the moving contact contacts the intermediate contact, it can drive the intermediate rotating sleeve to rotate. When the intermediate contact contacts the static contact, it is limited and cannot continue to rotate, thereby ensuring that the rotation angle of the central rotating shaft is always controlled within the predetermined rotation angle. The specific process of forward and reverse rotation is: during reverse (zero return) operation, the moving contact rotates together with the central rotating shaft. During the rotation, it will first touch the The intermediate contact set on the intermediate rotating sleeve on the central rotating shaft of the empty sleeve immediately drives the intermediate rotating sleeve to rotate together, and then continues to rotate until the moving contact pushes the intermediate rotating sleeve and the intermediate contact hits the static contact, at which time the motor receives the corresponding signal to stop running; in forward operation, the moving contact is first driven by the central rotating shaft to rotate forward and separate from the intermediate contact on the intermediate rotating sleeve, and the moving contact can continue to rotate until it hits the intermediate contact on the other side of the intermediate rotating sleeve, and then pushes the intermediate rotating sleeve to rotate forward together, and finally the intermediate contact hits the other side of the static contact and sends a corresponding signal to the motor, and the motor stops; wherein, the role of the intermediate rotating sleeve is to compensate for the defect that the moving contact cannot rotate a full circle due to the geometric size limitation of itself and the static contact. It can be seen from the working process of the above-mentioned limit device that the limit device avoids the problem of optical fiber breakage caused by the loss of control of the central rotating motor. In addition, since the sum of the radiation occupied angles of the two ends of the moving contact, the two ends of the stationary contact and the two ends of the intermediate contact relative to the central rotating axis does not exceed 360°, it can be ensured that the rotation of the central rotating axis can meet at least 360°.

[0031] In some specific embodiments, the moving contact 6 may specifically include a return-to-zero moving contact 9 and a positive rotation contact 10, the return-to-zero moving contact 9 and the positive rotation contact 10 are located on the same side of the intermediate contact 8, and the static contact 7 is grounded, the return-to-zero moving contact 9 and the positive rotation contact 10 are respectively connected to their own high-level signals, and the intermediate contact 8 is a conductor. When the driving circuit of the center motor 11 used to drive the center rotating shaft 1 receives a low-level signal from the return-to-zero moving contact 9 or the positive rotation contact 10, the driving circuit stops sending the driving signal, and the center motor 11 stops rotating at this time. By detecting the level signals of the return-to-zero moving contact and the positive rotation contact, it is convenient to know whether the center rotating shaft is in a return-to-zero state or in a state of forward rotation to the maximum angle when the center motor stops. Of course, it is understandable that if the center motor and the driving torque are small, the electrical zero position may not be set. When the center rotating shaft and the moving contact thereon drive the intermediate contact to hit the static contact, the center motor is blocked, and the driving circuit stops rotating immediately after detecting that the center motor is blocked.

[0032] The specific structure and working process are as follows: the static contact is grounded, and the intermediate contact on the intermediate rotating sleeve is suspended in the annular gap in the central rotating part and is electrically insulated from the focal plane. However, when the intermediate contact is in contact with the static contact and the moving contact at the same time, the static contact and the moving contact can be electrically connected, and the forward rotation and return to zero moving contacts are respectively connected to their own high-level signals; when returning to zero, the return to zero moving contact first touches the suspended intermediate contact, and the potential will not be pulled down at this time, until the intermediate contact is pushed to touch the static contact, and the grounded static contact pulls the high-level return to zero moving contact down to a low level through the intermediate contact, thereby stopping the drive circuit from driving; similarly, when rotating forward, the forward rotating contact first touches the intermediate contact and pushes the intermediate rotating sleeve to rotate forward, and at this time the forward rotating contact is suspended, and the motor will not stop running until the intermediate contact is pushed to rotate forward and touch the static contact from another direction, and the grounded static contact pulls the high-level forward rotating contact down to a low level through the intermediate contact, thereby stopping the drive circuit from driving, thereby achieving a limiting effect on the central rotating shaft of the central rotating part.

[0033] In some more specific embodiments, a fixing ring 12 is fixedly arranged on the central rotating shaft 1, and the moving contact 6 is fixed on the fixing ring 12. Preferably, the moving contact is fixed on the end surface of the fixing ring, and of course, it can also be fixed at other positions of the fixing ring, such as on the circumference of the fixing ring. By setting a fixing ring on the central rotating shaft to fix the moving contact, the setting and fixing of the moving contact are more convenient and easy to implement.

[0034] In a further embodiment, the fixing ring 12 can be generally fixed on the central rotating shaft 1 by pins. Of course, it can be understood that the above-mentioned fixing method using pins is only a preferred example of the fixing method of the fixing ring in the embodiment of the present invention. In actual application, other fixing methods commonly used by those skilled in the art, such as key connection, etc., can also be used.

[0035] In some more specific embodiments, the structure of the static contact 7 can be a columnar body with a semicircular cross-section, and the columnar body can be fixed to the fixed sleeve 3 by screws 21, or fixed to the fixed sleeve by other fixing methods. Of course, it should be noted that those skilled in the art should be able to understand that the semicircular columnar body is only a preferred example of the structural shape of the static contact in the embodiment of the present invention. In actual application, the static contact structure designed into other structural shapes can also be selected according to actual needs, such as directly installing a fixing pin on the fixed sleeve as a static contact.

[0036] In a further implementation scheme, a planetary internal gear is fixedly provided on the above-mentioned fixed sleeve 3, and a pinion gear meshing with the planetary internal gear is provided on the motor shaft of the central motor 11 installed on the central rotating shaft 1. The central rotating shaft 1 and the central motor 11 are driven to rotate and rotate by the cooperation of the stationary planetary internal gear and the motor pinion. This makes it more convenient to set the position of the motor and the gear, and can achieve the purpose of the reducer. Of course, it can be understood that the above is only a preferred example of an embodiment of the present invention. In actual application, it can also be achieved by the gear cooperation with other types of reducers. Of course, it can also be the other way around, the planetary internal gear is fixed together with the central rotating shaft, and the central motor is fixed on the fixed sleeve. At this time, the central motor rotates in situ, and the planetary internal gear drives the central rotating shaft to rotate.

[0037] In a further embodiment, a central backlash eliminating spring 13 is axially arranged in the annular gap 4 to eliminate the gap between the gears. The arrangement of the central backlash eliminating spring 13 makes the fit between the gears tighter, avoiding the gap from affecting the accuracy of the rotation transmission. It should be noted that, generally speaking, not only the internal transmission of the central rotating part 15 needs to be arranged with a backlash eliminating spring, but also the eccentric rotating part 16 generally has an eccentric backlash eliminating spring 20 arranged therein, which is also for the purpose of improving the accuracy of the transmission.

[0038] It should also be noted that those skilled in the art should be able to understand that the intermediate rotating sleeve 5 needs to be able to rotate freely only within the annular gap 4, but cannot move axially, so it needs to be axially limited, and the specific form of the axial limiting structure can be that one end of the intermediate rotating sleeve 5 is axially limited to the end face of the static contact 7, and the other end of the intermediate rotating sleeve 5 is provided with an axial limiting portion 14, and the axial limiting portion 14 is fixed on the central rotating shaft 1. It should be noted here that the axial limiting portion 14 can be an additional setting kit fixed to the central rotating shaft by threads, or a shoulder can be directly set on the central rotating shaft 1 to achieve limiting. In actual application, it can be selected and set according to the convenience of actual processing and actual needs.

[0039] In addition, the present invention also provides an optical fiber positioning unit for a spectroscopic astronomical telescope, including a limiting device 18, and the limiting device 18 is a limiting device as described in any of the above schemes. Since the above limiting device has the above technical effects, the optical fiber positioning unit for a spectroscopic astronomical telescope having the above limiting device should also have corresponding technical effects, which will not be described in detail here.

[0040] In addition, it should be noted that those skilled in the art should be able to understand that the optical fiber positioning unit for the spectroscopic telescope generally includes a central rotating part 15, an eccentric rotating part 16, and an optical fiber frame 17, wherein the limit device 18 is arranged at the bottom end of the central rotating part 15, and of course, it can also be arranged at other positions of the central rotating part, such as the front end of the central rotating part, the top end of which is connected to the eccentric rotating part 16, the top end of the eccentric rotating part 16 is connected to the optical fiber frame 17, and the optical fiber is fixed on the optical fiber frame 17. Among them, the eccentric rotating part 16 drives the eccentric rotating shaft 2 to rotate through the deflection motor 19.

[0041] The above is a detailed introduction to the optical fiber positioning unit and the position limiting device thereof for the spectroscopic astronomical telescope provided by the present invention. It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0042] It should also be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0043] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A positioning device for an optical fiber positioning unit of a spectral astronomical telescope, characterized in that: The invention comprises a fixed sleeve (3) rotatably mounted on a central rotating shaft (1), an annular gap (4) formed between the central rotating shaft (1) and the fixed sleeve (3), and an intermediate rotating sleeve (5) mounted in the annular gap (4) and capable of freely rotating in the annular gap (4); a moving contact (6) is fixedly mounted on the central rotating shaft (1), a stationary contact (7) is fixedly mounted on the fixed sleeve (3), an intermediate contact (8) is fixedly mounted on the intermediate rotating sleeve (5), and the moving contact (6), the stationary contact (7) and the intermediate contact (8) are fixedly mounted on the intermediate rotating sleeve (5). The intermediate contacts (8) are all located in the annular gap, the movable contact (6) and the stationary contact (7) have a preset gap along the axial direction of the central rotating shaft (1), the movable contact (6) and the intermediate contact (8) have an overlapping portion along the axial direction of the central rotating shaft (1), and the intermediate contact (8) can abut against the stationary contact (7) when the intermediate contact (8) rotates to a preset position; and the sum of the radiation occupied angles of the movable contact (6), the stationary contact (7) and the intermediate contact (8) relative to the central rotating shaft (1) does not exceed 360°; A fixing ring (12) is fixedly arranged on the central rotating shaft (1), and the moving contact (6) is fixed on the fixing ring (12); One end of the intermediate rotating sleeve (5) is axially limited at the end surface of the stationary contact (7), and the other end of the intermediate rotating sleeve (5) is provided with an axial limiting portion (14), and the axial limiting portion (14) is fixed on the central rotating shaft (1).

2. The position limiting device for the optical fiber positioning unit of the spectral astronomical telescope according to claim 1, characterized in that: The moving contact (6) comprises a return-to-zero moving contact (9) and a positive rotating contact (10), the return-to-zero moving contact (9) and the positive rotating contact (10) are located on the same side of the intermediate contact (8), and the stationary contact (7) is grounded. The return-to-zero moving contact (9) and the positive rotating contact (10) are respectively connected to their own high-level signals, and the intermediate contact (8) is a conductor. When a driving circuit for a center motor (11) for driving the center rotating shaft (1) receives a low-level signal from the return-to-zero moving contact (9) or the positive rotating contact (10), the driving circuit stops sending a driving signal, and the center motor (11) stops rotating.

3. The position limiting device for the optical fiber positioning unit of the spectral astronomical telescope according to claim 1, characterized in that: The fixing ring (12) is fixed on the central rotating shaft (1) via pins.

4. The position limiting device for the optical fiber positioning unit of the spectral astronomical telescope according to claim 1, characterized in that: The stationary contact (7) is a columnar body with a semicircular ring-shaped cross section.

5. The position limiting device for the optical fiber positioning unit of the spectral astronomical telescope according to claim 4, characterized in that: The stationary contact (7) is fixed to the fixing sleeve (3) by means of screws (21).

6. The position limiting device for the optical fiber positioning unit of a spectroscopic astronomical telescope according to any one of claims 1 to 5, characterized in that: A planetary internal gear is fixedly arranged on the fixed sleeve (3), and a pinion gear meshing with the planetary internal gear is arranged on the motor shaft of a central motor (11) for driving the central rotating shaft (1).

7. The position limiting device for the optical fiber positioning unit of the spectral astronomical telescope according to claim 6, characterized in that: A central backlash eliminating spring (13) is also arranged axially in the annular gap (4) and is used to eliminate the gap between the gears.

8. An optical fiber positioning unit for a spectroscopic astronomical telescope, comprising a limiting device (18), characterized in that: The limiting device (18) is the limiting device according to any one of claims 1 to 7.

Images