CN219697735U - DVS performance testing device - Google Patents

Abstract

The utility model provides a DVS performance testing device which comprises a shell, a testing main control board and a bracket, wherein the testing main control board is in signal connection with portable electronic equipment. The test main control board is fixed in the shell, the shell is provided with a first accommodating cavity, and the portable electronic equipment can be fixed in the first accommodating cavity when the test is performed; and be provided with the leg joint in the bottom of casing, therefore, the support can support the casing during the test, and the support can also support test main control board and the electronic equipment that is fixed in the casing. Because the test main control board and the electronic equipment can be fixedly contained in the shell, the space of the whole machine can be saved, and the whole structure is compact and convenient to carry. Meanwhile, due to the arrangement of the support, the whole equipment can be moved at will, the whole equipment can be stabilized at any position through the support, and further performance test of the DVS image sensor of the portable electronic equipment can be carried out under various scenes, so that actual requirements are met.

Description

DVS performance testing device

Technical Field

The utility model belongs to the field of product testing, and particularly relates to a DVS performance testing device.

Background

DVS (Dynamic Vision Sensor, dynamic visual sensor) is a new type of image sensor. Unlike conventional CMOS or CCD sensors, DVS is an image sensor that mimics the human eye's optic nerve, driven by events, and when the intensity of illumination changes beyond a certain threshold, stronger or weaker events are generated, and DVS image sensors have the advantages of high single pixel resolution, low power consumption, fast response, etc. With the development of smart phones, DVS image sensors are applied to devices such as mobile phones. DVS image sensors are required to perform performance tests when applied to portable electronic devices such as cellular phones. However, in the related art, the related testing device for connecting the DVS module and the electronic device to form the test object is generally bulky, and is generally disposed at a fixed position, so that the DVS module is difficult to move and carry, and is not suitable for application of the DVS module to a testing scene of the portable electronic device, and does not meet the actual requirements.

Disclosure of Invention

The utility model aims to provide a DVS performance testing device, which aims to solve the technical problem that in the related art, a related testing device for connecting a DVS module with electronic equipment to form a test object is not suitable for applying the DVS module to a testing scene of portable electronic equipment.

In order to solve the technical problems, the utility model provides a DVS performance testing device for a portable electronic device, which comprises a shell, a testing main control board accommodated in and fixed to the shell, and a bracket assembled at the bottom of the shell, wherein the shell is provided with a first accommodating cavity for accommodating and fixing the portable electronic device, a DVS module is integrated on the testing main control board, a yielding hole opposite to the DVS module is formed in the shell, and the testing main control board is used for being connected with the portable electronic device through signals.

Further, the shell comprises a frame body and a first cover body, a first groove is formed in one side of the frame body, and the first cover body covers the first groove to form the first accommodating cavity.

Further, the first groove is provided with first threaded columns distributed along the circumferential direction of the first groove, the first cover body is provided with first threaded holes corresponding to the positions of the first threaded columns, and the first cover body is fixedly connected with the frame body through screws.

Further, the first cover body is provided with a first through opening, and when the portable electronic device is fixed between the first groove and the first cover body, the screen of the portable electronic device faces the first opening.

Further, a second groove is formed in the other side, away from the first groove, of the frame body, the shell further comprises a second cover body, the second cover body covers the second groove to form a second accommodating cavity, the test main control board is accommodated and fixed in the second accommodating cavity, and the abdication hole is formed in the second cover body.

Further, a second threaded hole is formed in the periphery of the test main control board, a second threaded column corresponding to the second threaded hole is arranged in the second groove, and the test main control board is fixedly connected with the second groove through a screw.

Further, the DVS performance testing apparatus further includes a cooling fan disposed on one side of the test main control board, the second cover is provided with a second opening that is communicated with the second groove, and the cooling fan protrudes from the second opening to the outer side of the second cover.

Further, the housing further includes a heat dissipation protection cover having a vent hole, and the heat dissipation protection cover is fixed on one side of the second cover body facing away from the frame body and covers the heat dissipation fan.

Further, the testing device further comprises a base fixed on the bottom side of the shell, a mounting plate combined with the bottom side of the base to form a third accommodating cavity, and a secondary battery fixed in the third accommodating cavity, wherein the secondary battery is used for being electrically connected with the portable electronic equipment and the testing main control board.

Further, the bracket comprises a fixed block fixed on the bottom side of the mounting plate and a plurality of supporting feet which are equidistantly encircling the fixed block and rotatably connected with the fixed block.

Compared with the related art, the DVS performance testing device has the beneficial effects that:

the DVS performance testing device comprises a shell, a testing main control board and a support, wherein the testing main control board is fixed in the shell, a first accommodating cavity is formed in the shell, and when testing is carried out, the portable electronic equipment can be fixed in the first accommodating cavity; and be provided with the leg joint in the bottom of casing, therefore, the support can support the casing during the test, and the support can also support test main control board and the electronic equipment that is fixed in the casing. Because test main control board and electronic equipment all can be fixed to accept in the casing to can practice thrift complete machine space, overall structure is compact, and accept test main control board in the casing, can protect test main control board from external disturbance, prevent that test main control board from appearing phenomena such as short circuit or circuit break, thereby can prevent that the complete machine is impaired. Meanwhile, due to the arrangement of the support, the whole equipment can be moved at will, the portable electronic equipment is convenient to carry, the whole equipment can be stabilized at any position through the support, and further performance testing of the DVS image sensor of the portable electronic equipment can be performed under various scenes, and the practical requirements are met.

The test main control board is integrated with a DVS module and is connected with the portable electronic equipment through signals. In the test process, the test main control board converts the double MIPI signals in the DVS module into single MIPI signals and controls the single MIPI signals to be output to the portable electronic equipment, so that a test object can be formed. It should be understood that the testing device of the present solution further includes a testing unit, where the testing unit is connected to the test object and is used for testing the test object, so as to implement performance testing when the DVS module is applied to the portable electronic device; the test unit is the same as the test unit of the related art, and the test principle of the test unit on the test object is also the same, which is not described herein. The DVS module is arranged in the yielding hole of the shell, so that the shell can be prevented from blocking the view angle of the DVS module, the imaging of the DVS module is not influenced, and the DVS performance test of the test unit on the test object can be ensured not to be influenced. In addition, the DVS module of the scheme can be combined with other common camera modules to form a double-shot module or a multi-shot module, and then the double-shot module and the portable electronic equipment are connected to form a test object, or the multi-shot module and the portable electronic equipment are connected to form the test object, so that the DVS performance test of the test unit on each test object can be realized, and the performance test of the double-shot module or the multi-shot module when applied to the portable electronic equipment such as a mobile phone can be realized. Further, the DVS module of the test main control board has extremely strong compatibility, can be compatible with portable electronic equipment of various types, and is suitable for DVS performance test of different types of portable electronic equipment.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other drawings may be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a DVS performance test apparatus according to an embodiment of the present utility model;

fig. 2 is an exploded view of a DVS performance testing apparatus in accordance with an embodiment of the present utility model.

In the drawings, each reference numeral denotes: 1. a housing; 11. a frame; 111. a second groove; 1111. a second threaded post; 12. a first cover; 121. a first threaded hole; 122. a first opening; 13. a second cover; 131. a relief hole; 132. a second opening; 14. a heat dissipation protective cover; 2. testing a main control board; 21. a DVS module; 22. a second threaded hole; 3. a bracket; 31. a fixed block; 32. supporting feet; 4. a base; 5. a mounting plate; 6. a secondary battery; 100. a portable electronic device.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1-2, the utility model provides a DVS performance testing apparatus for testing DVS performance of a portable electronic device 100, which includes a housing 1, a testing main control board 2 accommodated in and fixed to the housing 1, and a bracket 3 assembled at the bottom of the housing 1, wherein the housing 1 has a first accommodating cavity for accommodating and fixing the portable electronic device 100, the testing main control board 2 is integrated with a DVS module 21, the housing 1 is provided with a yielding hole 131 opposite to the DVS module 21, and the testing main control board 2 is used for signal connection with the portable electronic device 100.

The DVS performance testing apparatus of the present disclosure includes a housing 1, a testing main control board 2, and a bracket 3, where the testing main control board 2 is fixed in the housing 1, and the housing 1 is provided with a first accommodating cavity, and when testing, the portable electronic device 100 may be fixed in the first accommodating cavity; and the bracket 3 is provided to be connected to the bottom of the housing 1, so that the bracket 3 can support the housing 1, and the test main control board 2 and the portable electronic device 100 fixed to the housing 1 during testing. Because the test main control board 2 and the portable electronic device 100 can be fixedly contained in the shell 1, the whole machine space can be saved, the whole structure is compact, and the test main control board 2 is contained in the shell 1, so that the test main control board 2 can be protected from external interference, short circuit or open circuit and other phenomena of the test main control board 2 are prevented, and the whole machine can be prevented from being damaged. Meanwhile, the support 3 is arranged, so that the whole equipment can be moved at will, the portable electronic equipment is convenient to carry, the whole equipment can be stabilized at any position through the support 3, further, the performance test of the DVS image sensor of the portable electronic equipment 100 can be carried out under various scenes, and the actual requirements are met.

The test main control board 2 is integrated with a DVS module 21, and the test main control board 2 is in signal connection with the portable electronic device 100. In the test process, the test main control board 2 converts the dual MIPI signals in the DVS module 21 into single-path MIPI signals, and controls the single-path MIPI signals to be output to the portable electronic device 100, so that a test object can be formed. It should be understood that the test apparatus of the present embodiment further includes a test unit connected to the test object for testing the test object, so as to implement performance test when the DVS module 21 is applied to the portable electronic device 100; the test unit is the same as the test unit of the related art, and the test principle of the test unit on the test object is also the same, which is not described herein. The DVS module 21 is opposite to the yielding hole 131 of the housing 1, so that the housing 1 can be prevented from blocking the view angle of the DVS module 21, and the imaging of the DVS module 21 is not affected, thereby ensuring that the DVS performance test of the test unit on the test object is not affected. In addition, the DVS module 21 of the present embodiment may be further combined with other common camera modules to form a dual-camera module or a multi-camera module, and then the dual-camera module is connected with the portable electronic device 100 to form a test object, or the multi-camera module is connected with the portable electronic device 100 to form a test object, so that the DVS performance test of the test unit on each test object can be also implemented, and thus the performance test when the dual-camera module or the multi-camera module is applied to the portable electronic device 100 such as a mobile phone can be implemented. Further, the DVS module 21 of the test master control board 2 of the present embodiment has very strong compatibility, and can be compatible with portable electronic devices 100 of various models, and is suitable for DVS performance tests of portable electronic devices 100 of different models.

Further, the housing 1 includes a frame 11 and a first cover 12, one side of the frame 11 is provided with a first groove, and the first cover 12 covers the first groove to form a first accommodating cavity.

Specifically, the portable electronic device 100 may include a mobile phone, a tablet computer, and the like as a main body of a test object, where the first groove is a square groove structure matched with the shape of the main body of the test object, and the first cover 12 is a corresponding rectangular structure; the first cover body 12 is detachably connected with the frame body 11; before testing, the mobile phone can be placed in the first groove, the first groove is covered by the first cover body 12, and one surface of the first cover body 12 supports the mobile phone, so that the mobile phone can be stably placed between the first cover body 12 and the frame body 11, the whole space can be saved, and the structure is compact. And the outermost edge of the first groove is also provided with an annular groove, so that the peripheral side of the first cover body 12 can be abutted against the groove wall of the annular groove, and the whole structure is more compact.

Further, the first groove is provided with first screw columns arranged along the circumferential direction thereof, the first cover 12 is provided with first screw holes 121 corresponding to the positions of the first screw columns, and the first cover 12 is fixedly connected with the frame 11 through screws.

Specifically, in this embodiment, three first threaded columns are distributed at equal intervals on two sides of the first groove in the vertical direction, six first threaded holes 121 are correspondingly formed in the first cover 12, before testing, after the portable electronic device 100 such as a mobile phone is placed in the middle area of the first groove, screws penetrate through the first threaded holes 121 and the first threaded columns, the first cover 12 and the frame 11 are assembled and connected, and therefore the first cover 12 can support the mobile phone, and the mobile phone is stably stored in the first groove. Because the first threaded columns are uniformly arranged on two sides of the first groove, the first threaded holes 121 are uniformly arranged on two sides of the first cover body 12, and therefore the stress on two sides of the frame body 11 and the first groove is balanced, and the mobile phone can be stored in the first accommodating cavity more stably. After the test is finished, the screw can be screwed out to separate the first cover body 12 from the frame body 11, so that the mobile phone and the like can be easily taken out, and the detachable connection between the portable electronic device 100 and the testing device is realized.

In some embodiments, the number of first threaded posts and first threaded holes 121 may be provided with two, four or eight, ten or twelve, etc.; in other embodiments, the first cover 12 and the frame 11 may be detachably connected by a snap connection, a hinge connection, or the like.

Further, the first cover 12 is provided with a first opening 122 therethrough, and when the portable electronic device 100 is fixed between the first recess and the first cover 12, the screen thereof faces the first opening 122.

Specifically, when the main body of the test object is a mobile phone, the first opening 122 is rectangular, and the area of the first opening 122 is smaller than that of the mobile phone, so that the mobile phone can be supported by the first cover 12 in the test process, and the mobile phone cannot fall out from the first opening 122, thereby ensuring that the mobile phone is stably placed in the first accommodating cavity. In the DVS performance testing process, the mobile phone display interface may be clearly seen from the mobile phone screen through the first opening 122, and the mobile phone may be manually operated through the first opening 122, so as to facilitate the operation in the testing process.

Further, the other side of the frame 11, which is away from the first groove, is provided with a second groove 111, the housing 1 further includes a second cover 13, the second cover 13 covers the second groove 111 to form a second accommodating cavity, the test main control board 2 is accommodated in and fixed to the second accommodating cavity, and the abdicating hole 131 is provided in the second cover 13.

Specifically, the first groove and the second groove 111 are located at two opposite sides of the frame 11, the test main control board 2 is of a rectangular structure, the second groove 111 is a square groove matched with the test main control board 2 in shape, and the test main control board 2 is fixed on the groove wall of the second groove 111 and is contained in the second groove 111, so that the whole machine space can be saved, and the structure is compact. An annular groove is further formed in the outermost edge of the second groove 111, so that the peripheral side of the second cover 13 can be abutted against the groove wall of the annular groove, the overall structure is more compact, the appearance is attractive, and the second cover 13 has the effects of decoration and beautification.

Further, a second threaded hole 22 is formed in the peripheral side of the test main control board 2, a second threaded column 1111 corresponding to the second threaded hole 22 is formed in the second groove 111, and the test main control board 2 is fixedly connected with the second groove 111 through screws.

Specifically, in this embodiment, the four corners of the test main control board 2 are respectively provided with a second threaded hole 22, four second threaded columns 1111 are disposed at corresponding positions of the second grooves 111, and then the screws penetrate through the second threaded holes 22 and the second threaded columns 1111, so that the test main control board 2 can be stably assembled in the second grooves 111.

In some embodiments, the number of second threaded posts 1111 and second threaded holes 22 may be provided with two, six, eight, etc., and evenly distributed; in other embodiments, the first cover 12 and the frame 11 may be detachably connected by a snap connection, a hinge connection, or the like.

Further, in this embodiment, three third threaded columns are distributed on two sides of the second groove 111 at equal intervals in the vertical direction, and six third threaded holes are correspondingly formed on the second cover 13, and then the second cover 13 is assembled and connected with the frame 11 by passing through the second threaded holes 22 and the second threaded columns 1111 through screws, so as to realize stable connection between the second cover 13 and the frame 11. Because the third screw thread post evenly sets up in second recess 111 both sides, and the third screw hole evenly sets up in second lid 13 both sides, consequently the atress of framework 11 and second recess 111 both sides is balanced, can guarantee overall structure's stability, non-deformable.

In some embodiments, the number of third threaded posts and third threaded holes may be provided with two, four or eight, ten or twelve, etc.; in other embodiments, the second cover 13 and the frame 11 may be detachably connected by a snap connection, a hinge connection, or the like.

Further, the DVS performance testing apparatus further includes a cooling fan disposed on one side of the testing main control board 2, the second cover 13 is provided with a second opening 132 that is communicated with the second groove 111, and the cooling fan protrudes from the second opening 132 outside the second cover 13.

In the testing process, the test main control board 2 generates heat, so that a cooling fan needs to be arranged on one side of the test main control board 2, protrudes out of the outer side of the second cover body 13 and is communicated with the outside, the wind direction of the cooling fan faces the heating surface of the test main control board 2, and the test main control board 2 can be cooled through the running of the cooling fan, so that the test main control board 2 can run for a long time without generating heat, and the quality of the whole equipment is ensured.

Further, the housing 1 further includes a heat dissipation protective cover 14 having a vent hole, and the heat dissipation protective cover 14 is fixed to a side of the second cover 13 facing away from the frame 11 and covers the heat dissipation fan.

The heat radiation protection cover 14 is provided with a plurality of ventilation holes, so that external cold air flow can flow to the heat radiation fan through the ventilation holes, and the heat radiation fan accelerates the flow speed of the cold air flow, thereby cooling the test main control board 2. By providing the heat radiation protection cover 14, it is possible to prevent the heat radiation fan from contacting the outside during operation to cause personal injury or damage to the article.

Further, the testing device further comprises a base 4 fixed on the bottom side of the casing 1, a mounting plate 5 combined with the bottom side of the base 4 to form a third accommodating cavity, and a secondary battery 6 fixed in the third accommodating cavity, wherein the secondary battery 6 is used for being electrically connected to the portable electronic device 100 and the testing main control board 2.

Specifically, in this embodiment, the secondary battery 6 may be a charger, the base 4 and the frame 11 are both in a cuboid structure, the bottom area of the base 4 is larger than the bottom area of the frame 11, and the base 4 is made of an aluminum alloy material and has a certain structural strength, so that the base 4 may support the frame 11, and thus the base 4 may support the housing 1, and the portable electronic device 100 and the test main control board 2 fixedly assembled in the housing 1. The bottom side of the frame 11 is provided with a fourth threaded column, the top side of the base 4 is provided with a fourth threaded hole corresponding to the fourth thread, and the frame 11 is fixedly connected with the base 4 through screws. The number of the fourth screw posts and the fourth screw holes is not particularly limited. The mounting plate 5 is the rectangle structure the same with base 4 bottom area size, is provided with the fifth screw thread post in the four corners of base 4 bottom side, and mounting plate 5 four corners is provided with the fifth screw hole, and base 4 and mounting plate 5 pass through screw fixation assembly. The base 4 and the mounting plate 5 are fixed to form a third accommodating chamber, so that the charger baby can be stably accommodated in the third accommodating chamber. The charger baby is electrically connected with the test main control board 2 and the portable electronic device 100, so that power can be supplied to the two.

Further, the bracket 3 includes a fixed block 31 fixed to the bottom side of the mounting plate 5, and a plurality of supporting legs 32 surrounding the fixed block 31 at equal intervals and rotatably connected to the fixed block 31.

Specifically, in the present embodiment, the fixing block 31 is in a flat cylindrical structure, three supporting legs 32 are rotatably connected with the fixing block 31, and rotational damping exists between the supporting legs 32 and the fixing block 31. In a normal state, three support legs 32 may be combined, and the three support legs 32 are in contact with each other and vertically connected to the mounting plate 5. When the portable electronic device is used, the three supporting legs 32 can be separated, the three supporting legs 32 are arranged on the periphery of the fixed block 31 in a scattering mode, an operator can control the separation degree of the three supporting legs 32, and accordingly the position of the fixed block 31 on the vertical height can be adjusted, and the heights of the shell 1, the base 4, the mounting plate 5 and the like can be adjusted due to the fact that the shell 1, the base 4, the mounting plate 5 and the like are mounted on the top of the fixed block 31, and then the height positions of the portable electronic device 100 and the testing main control board 2DVS can be adjusted. The support legs 32 and the fixed blocks 31 have rotation damping, so that after an operator separates the three support legs 32 to a target state, the three support legs 32 can be stably in the target state without sliding and rotating by themselves, and the stability of the support 3 is ensured.

In some embodiments, the number of support feet 32 may be four, five, six, or the like. In other embodiments, the fixing block 31 may have a square column structure, and four supporting feet 32 may be disposed on four sides of the fixing block 31.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.

The foregoing is a description of the embodiments of the present utility model, and is not to be construed as limiting the utility model, since modifications in the detailed description and the application scope will become apparent to those skilled in the art upon consideration of the teaching of the embodiments of the present utility model.

Claims (10)

1. The DVS performance testing device is used for testing the DVS performance of the portable electronic equipment and is characterized by comprising a shell, a testing main control board and a bracket, wherein the testing main control board is accommodated in and fixed to the shell, the bracket is assembled at the bottom of the shell, the shell is provided with a first accommodating cavity for accommodating and fixing the portable electronic equipment, a DVS module is integrated on the testing main control board, a yielding hole opposite to the DVS module is formed in the shell, and the testing main control board is used for being connected with the portable electronic equipment through signals.

2. The DVS performance testing device of claim 1, wherein the housing includes a frame and a first cover, a first recess is formed in one side of the frame, and the first cover covers the first recess to form the first receiving cavity.

3. The DVS performance testing device according to claim 2, wherein the first groove is provided with first threaded columns arranged along a circumferential direction thereof, the first cover is provided with first threaded holes corresponding to the positions of the first threaded columns, and the first cover is fixedly connected with the frame by screws.

4. The DVS performance testing apparatus of claim 2, wherein the first cover is provided with a first opening therethrough, and the screen of the portable electronic device faces the first opening when the portable electronic device is fixed between the first recess and the first cover.

5. The DVS performance testing apparatus of claim 2, wherein a second groove is formed on the other side of the frame facing away from the first groove, the housing further includes a second cover, the second cover covers the second groove to form a second accommodating cavity, the test main control board is accommodated in and fixed to the second accommodating cavity, and the yielding hole is formed in the second cover.

6. The DVS performance testing device of claim 5, wherein the peripheral side of the test master control board is provided with a second threaded hole, the second groove is provided with a second threaded post corresponding to the second threaded hole, and the test master control board is fixedly connected with the second groove by a screw.

7. The DVS performance testing device of claim 5, further comprising a cooling fan disposed on one side of the test main board, wherein the second cover is provided with a second opening communicating with the second groove, and the cooling fan protrudes from the second opening to the outside of the second cover.

8. The DVS performance testing device of claim 7, wherein the housing further comprises a heat dissipating protective cover having vent holes, the heat dissipating protective cover being secured to a side of the second cover facing away from the frame and covering the heat dissipating fan.

9. The DVS performance testing device according to any of claims 1 to 8, further comprising a base fixed to the bottom side of the housing, a mounting plate that cooperates with the bottom side of the base to form a third receiving cavity, and a secondary battery fixed to the third receiving cavity, the secondary battery being for electrical connection to the portable electronic device and the test main board.

10. A DVS performance testing apparatus according to claim 9 wherein the bracket includes a fixed block secured to the underside of the mounting plate and a plurality of support legs equally spaced around and rotatably connected to the fixed block.