Miniature multichannel optical fiber rotary connector

Abstract

The invention relates to the technical field of optical fiber communication, and discloses a miniature multichannel optical fiber rotary connector, which comprises a stator shell, a central rotating shaft and a rotor shell, and is characterized in that the rotor shell drives the central rotating shaft to rotate along the axis of the stator shell through a transmission mechanism, and the transmission ratio of the transmission mechanism is 2: 1; the end, close to the stator shell, of the center rotating shaft is fixedly connected with a prism adjusting base, a prism sleeve is installed in an inner cavity of the prism adjusting base in an extruding and suspending mode, the Dove prism is bonded to an inner cavity of the prism sleeve, and the optical axis of the Dove prism coincides with the axis of the center rotating shaft in an adjusting mode. The diameter of an inner hole, close to one end of the Dove prism, of the central rotating shaft is larger than the maximum diameter of the Dove prism. According to the invention, under the same shell size, a larger light transmission area can be obtained by adjusting the mounting position of the Dove prism; a dense optical fiber collimator array is obtained by adopting optical fiber collimators with small deflection angles, and dense multi-optical-path channel arrangement can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber communication, in particular to a miniature multi-channel optical fiber rotary connector. Background Art

[0002] Fiber optic rotary connector is a 360-degree unlimited rotation device used for transmitting optical communication. Its main function is to prevent signal interruption when transmitting optical fiber signals. Fiber optic rotary connector is realized based on the optical transmission characteristics of dove prism. When the dove prism rotates at an angular velocity of ω, the image formed by the dove prism rotates at an angular velocity of 2ω. Therefore, if the rotation speed ratio between the object and the dove prism is 2:1, the image formed by the object can be kept stationary.

[0003] Conventional fiber slip rings are large in size and have fewer channels. For example, the technical solution disclosed in the patent [CN111487726A-A miniaturized multi-channel fiber optic rotary connector] can only achieve 4 channels within a diameter of 25 mm. The Dove prism installation adopts a more complex sleeve structure, which occupies the main light-passing surface of the axis and limits the maximum light-passing diameter. In addition, ordinary micro collimators generally have an output angle of about 1 degree, and the bonding size is large, which cannot effectively utilize the space, limiting the number of channels inside the fiber optic rotary connector and the number of signal transmissions. . Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a miniature multi-channel fiber optic rotary connector, which solves the problem that the existing miniaturized fiber optic rotary connector occupies the main light-transmitting surface of the axis when installing a Dove prism, limits the maximum light-transmitting diameter, and at the same time limits the number of optical path transmission channels.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A miniature multi-channel optical fiber rotary connector comprises a stator housing, a central rotating shaft and a rotor housing, wherein the rotor housing drives the central rotating shaft to rotate along the axis of the stator housing through a transmission mechanism, the transmission ratio of the transmission mechanism is 2:1, a prism adjustment seat is fixedly connected to one end of the central rotating shaft close to the stator housing, a prism sleeve is extruded and suspended in the inner cavity of the prism adjustment seat, a dove prism is bonded to the inner cavity of the prism sleeve, the optical axis of the dove prism is adjusted to coincide with the axis of the central rotating shaft, and an inner hole of the end of the central rotating shaft close to the dove prism is larger than the maximum diameter of the dove prism.

[0009] Preferably, the prism adjustment seat has four groups of adjustment holes evenly distributed in a ring shape along the central axis, and the prism sleeve is fixed in the adjustment holes by suspended compression through screws connected by threads.

[0010] Preferably, a stator-end optical fiber collimator and a rotor-end optical fiber collimator are respectively provided at one end of the stator housing and the rotor housing inner cavity close to the central rotating axis, and the stator-end optical fiber collimator and the rotor-end optical fiber collimator are both bonded and fixed to an adhesive sleeve through an adhesive glass tube, the adhesive glass tube is bonded and fixed to the optical fiber collimator, and the adhesive sleeves are respectively fixedly provided in the stator housing and the rotor housing inner cavity.

[0011] Preferably, the stator-end optical fiber collimator and the rotor-end optical fiber collimator are both miniature optical fiber collimators with a deviation angle of less than 0.1 degrees.

[0012] Preferably, the transmission mechanism includes a stator bevel gear sleeve, a rotor bevel gear sleeve and a transmission bevel gear. The inner cavity of the stator housing is fixedly connected to the stator bevel gear sleeve, and the inner cavity of the rotor housing is fixedly connected to the rotor bevel gear sleeve. The rotor bevel gear sleeve and the stator bevel gear sleeve are driven by a group of transmission bevel gears to drive the central rotating shaft to rotate along the axial direction. The rotor bevel gear sleeve, the stator bevel gear sleeve and the transmission bevel gear form a planetary gear train, and the transmission bevel gear can rotate on the central rotating shaft.

[0013] Preferably, the number of teeth on the rotor bevel gear sleeve is consistent with that on the stator bevel gear sleeve, the gear ratio between the rotor bevel gear sleeve and the transmission bevel gear is 42:38, and the module is 0.2-0.3.

[0014] Preferably, the number of teeth on the rotor bevel gear sleeve is consistent with that on the stator bevel gear sleeve, and the gear ratio between the rotor bevel gear sleeve and the transmission bevel gear is 34:24, and the module is 0.5.

[0015] (III) Beneficial effects

[0016] The present invention has the following beneficial effects:

[0017] (1) The micro multi-channel fiber optic rotary connector of the present invention can accurately adjust the optical axis of the suspended Dove prism and the axis of the central rotation axis through the prism adjustment seat by arranging a prism sleeve at one end of the central rotation axis; at the same time, an inner hole larger than the maximum diameter of the Dove prism is opened at one end of the central rotation axis. Under this installation method, the passing area of ​​the light path through the hole is effectively increased, ensuring the high coaxiality of the Dove prism and the central rotation axis, so that the entire fiber optic rotary connector can be arranged with fiber optic collimators of more channels to form a transmission mode with more light path channels.

[0018] (2) The miniature multi-channel optical fiber rotary connector adopts an optical fiber collimator with a deflection angle of 0.1 degrees, so that the inner hole gap of the bonding glass tube can be within 0.1. The collimator arrangement can achieve an outer diameter of 19 mm for 7 channels. The outer diameter of the outer shell is 25 mm, and 12 channels can be arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention in the AA direction;

[0021] Figure 3 It is a schematic diagram of the layout structure of the transmission mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the prism adjustment seat of the present invention;

[0023] Figure 5 It is a schematic diagram of the layout structure of the Dove prism and the central rotation axis of the present invention;

[0024] Figure 6 This is a schematic diagram of the 12-channel layout structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the 7-channel layout structure of the present invention.

[0026] In the figure: 1. stator housing; 2. stator end optical fiber collimator; 21. bonding sleeve; 22. bonding glass tube; 3. Dove prism; 31. prism adjustment seat; 32. prism sleeve; 33. adjustment hole; 4. central rotation axis; 5. stator bevel gear sleeve; 6. rotor housing; 7. rotor bevel gear sleeve; 8. rotor end optical fiber collimator; 9. transmission bevel gear. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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] See also Figure 1The present invention provides a technical solution: a miniature multi-channel optical fiber rotary connector, comprising a stator housing 1, a central rotating shaft 4 and a rotor housing 6. The rotor housing 6 drives the central rotating shaft 4 to rotate along the axis of the stator housing 1 through a transmission mechanism. The transmission ratio of the transmission mechanism is 2:1. A prism adjustment seat 31 is fixedly connected to one end of the central rotating shaft 4 close to the stator housing 1. A prism sleeve 32 is extruded and suspended in the inner cavity of the prism adjustment seat 31. A dove prism 3 is bonded to the inner cavity of the prism sleeve 32. The optical axis of the dove prism 3 is adjusted to coincide with the axis of the central rotating shaft 4. The inner hole of the central rotating shaft 4 close to the end of the dove prism 3 is larger than the maximum diameter of the dove prism 3.

[0029] The present invention, through the prism sleeve 32 arranged at one end of the central rotating shaft 4, can accurately adjust the optical axis of the suspended dove prism 3 and the axis of the central rotating shaft 4 through the prism adjustment seat 31 to adjust the coincidence; at the same time, an inner hole larger than the maximum diameter of the dove prism 3 is opened at one end of the central rotating shaft 4. Under this installation method, the passing area of ​​the light path through the hole is effectively increased, and the high coaxiality of the dove prism 3 and the central rotating shaft 4 is ensured, so that the entire optical fiber rotary connector can be arranged with optical fiber collimators of more channels, forming a transmission mode with more optical path channels.

[0030] Reference Figure 4 and 5 As shown, in this embodiment, four groups of adjustment holes 33 are evenly distributed along the central axis on the prism adjustment seat 31, and the prism sleeve 32 is suspended and squeezed by screws connected by threads in the adjustment holes 33. The 6 degrees of freedom of the dove prism 3 in the prism sleeve 32 are adjusted by using 8 screws to adjust the holes 33, and the optical axis of the dove prism 3 is adjusted to coincide with the axis of the central rotation axis 4, which effectively increases the passing area of ​​the light path through the hole, ensures the high coaxiality of the dove prism 3 and the central rotation axis 4, and enables the entire optical fiber rotary connector to be equipped with more channels of optical fiber collimators, forming a transmission mode with more optical path channels.

[0031] In this embodiment, a stator-end optical fiber collimator 2 and a rotor-end optical fiber collimator 8 are respectively provided at one end of the inner cavity of the stator housing 1 and the rotor housing 6 close to the central rotating axis 4. The stator-end optical fiber collimator 2 and the rotor-end optical fiber collimator 8 are both bonded and fixed to the bonding sleeve 21 through a bonding glass tube 22. The bonding glass tube 22 is bonded and fixed to the optical fiber collimator. The bonding sleeve 21 is respectively fixedly provided in the inner cavity of the stator housing and the rotor housing 6.

[0032] Reference Figure 2 and 3As shown, in this embodiment, both the stator-end fiber collimator 2 and the rotor-end fiber collimator 8 use miniature fiber collimators with a deflection angle of less than 0.1 degrees. By using a fiber collimator with a deflection angle of 0.1 degrees, the inner hole gap of the bonding glass tube 22 can be achieved within 0.1. The collimator arrangement can achieve an outer diameter of 19 mm and 7 channels. The outer diameter of the outer shell is 25 mm, and 12 channels can be arranged. Usually, there is a deflection angle when the fiber collimator beam is output, which is specified as point accuracy in the industry. The larger the deflection angle, the larger the inner hole size of the bonding glass tube 22, the larger the area of ​​the arrangement of the same number of paths, and the smaller the number of channels.

[0033] In this embodiment, the inner cavity of the stator housing 1 is fixedly connected to a stator bevel gear sleeve 5, and the inner cavity of the rotor housing 6 is fixedly connected to a rotor bevel gear sleeve 7. The rotor bevel gear sleeve 7 and the stator bevel gear sleeve 5 are driven by a group of transmission bevel gears 9 to drive the central rotating shaft 4 to rotate along the axial direction. The rotor bevel gear sleeve 7, the stator bevel gear sleeve 5 and the transmission bevel gear 9 form a planetary gear train, and the transmission bevel gear can rotate on the central rotating shaft 4.

[0034] In this embodiment, the number of teeth on the rotor bevel gear sleeve 7 is consistent with that on the stator bevel gear sleeve 5, the gear ratio between the rotor bevel gear sleeve 7 and the transmission bevel gear 9 is 42:38, and the module is 0.2-0.3.

[0035] In this embodiment, the number of teeth on the rotor bevel gear sleeve 7 is consistent with that on the stator bevel gear sleeve 5, and the gear ratio between the rotor bevel gear sleeve 7 and the transmission bevel gear 9 is 34:24, and the module is 0.5.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, 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 process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniature multi-channel optical fiber rotary connector, comprising a stator housing, a central rotating shaft and a rotor housing, wherein the rotor housing drives the central rotating shaft to rotate along the axis of the stator housing through a transmission mechanism, and the transmission ratio of the transmission mechanism is 2:1, characterized in that: A prism adjustment seat is fixedly connected to one end of the central rotating shaft close to the stator shell, a prism sleeve is extruded and suspended in the inner cavity of the prism adjustment seat, a dove prism is bonded to the inner cavity of the prism sleeve, the optical axis of the dove prism is adjusted to coincide with the axis of the central rotating shaft, and an inner hole of the central rotating shaft close to one end of the dove prism is larger than the maximum diameter of the dove prism.

2. A miniature multi-channel optical fiber rotary connector according to claim 1, characterized in that: The prism adjustment seat is provided with four groups of adjustment holes evenly distributed in a ring along the central axis, and the prism sleeve is fixed in the adjustment holes by screws connected by threads and pressed in the air.

3. A miniature multi-channel optical fiber rotary connector according to claim 2, characterized in that: A stator-end optical fiber collimator and a rotor-end optical fiber collimator are respectively provided at one end of the stator shell and the rotor shell inner cavity close to the central rotating axis. The stator-end optical fiber collimator and the rotor-end optical fiber collimator are both bonded and fixed to the bonding sleeve through a bonding glass tube. The bonding glass tube is bonded and fixed to the optical fiber collimator. The bonding sleeves are respectively fixedly provided in the stator shell and the rotor shell inner cavity.

4. The micro multi-channel optical fiber rotary connector according to claim 3, characterized in that: The stator end optical fiber collimator and the rotor end optical fiber collimator are both miniature optical fiber collimators with a deviation angle of less than 0.1 degrees.

5. A miniature multi-channel optical fiber rotary connector according to any one of claims 1 to 4, characterized in that: The transmission mechanism includes a stator bevel gear sleeve, a rotor bevel gear sleeve and a transmission bevel gear. The inner cavity of the stator housing is fixedly connected to the stator bevel gear sleeve, and the inner cavity of the rotor housing is fixedly connected to the rotor bevel gear sleeve. The rotor bevel gear sleeve and the stator bevel gear sleeve are driven by a group of transmission bevel gears to drive the central rotating shaft to rotate along the axial direction. The rotor bevel gear sleeve, the stator bevel gear sleeve and the transmission bevel gear form a planetary gear system, and the transmission bevel gear can rotate on the central rotating shaft.

6. The micro multi-channel optical fiber rotary connector according to claim 5, characterized in that: The number of teeth on the rotor bevel gear sleeve is consistent with that on the stator bevel gear sleeve, the gear ratio between the rotor bevel gear sleeve and the transmission bevel gear is 42:38, and the module is 0.2-0.

3.

7. The micro multi-channel optical fiber rotary connector according to claim 5, characterized in that: The number of teeth on the rotor bevel gear sleeve is consistent with that on the stator bevel gear sleeve, and the gear ratio between the rotor bevel gear sleeve and the transmission bevel gear is 34:24, and the module is 0.5.

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