CN111855703A - Scanning camera gear shifting device and scanning camera - Google Patents

Abstract

The invention relates to the technical field of scanning cameras, in particular to a scanning camera gear shifting device and a scanning camera, which comprise a base, a driving piece, a gear shifting mechanism and a connecting piece, wherein the driving piece and the gear shifting mechanism are arranged on the base; the driving piece can drive the gear shifting mechanism to shift gears in a first direction through the connecting piece; the gear shifting mechanism is provided with a first circuit board, the first circuit board is provided with a plurality of groups of contacts arranged along a first direction, each group of contacts comprises a positive contact and a negative contact, and when the gear shifting mechanism moves to a gear position, at least one group of positive contacts and at least one group of negative contacts can be conducted with a second circuit board. The invention can reduce the risk of oscillation echo of the pulse signal in the second circuit board and improve the quality of the output pulse signal.

Description

Scanning camera gear shifting device and scanning camera

Technical Field

The invention relates to the technical field of scanning cameras, in particular to a scanning camera gear shifting device and a scanning camera.

Background

In an image converter tube ultrafast imaging system, high-speed scanning pulses have important application, and high-slope leading edge pulses generated by the high-speed scanning pulses can provide fast scanning signals for a deflection system of an image converter tube scanning camera, so that the image converter tube camera can realize fast scanning separation on a time dimension for the ultrafast signals. In a picosecond time resolution scanning camera system, the slope of the scanning pulse signal is required to reach hundreds to thousands of volts per nanosecond; in a repetition frequency synchronous scanning camera system, the working trigger frequency range is 1Hz to 1MHz, and the slope range of the scanning pulse signal is also dozens to hundreds of volts per nanosecond.

The high-slope pulse signal is usually generated by using a MOS transistor or an avalanche transistor, and the slope of the generated pulse signal can be changed only by changing the circuit structure. Different scanning slopes correspond to different scanning speeds of the scanning camera, so that structural components of the scanning pulse generating circuit, which are generally called gear components, need to be replaced when the scanning camera works at different scanning speeds. Generally, a gear component in a scanning pulse generating circuit is a connector manufactured by electronic components such as a capacitor, an inductor, a resistor and the like, manual gear shifting needs manual operation in the use environment of an X-ray scanning camera, and a human body is in danger of X-ray radiation, so that the manual gear shifting is very inconvenient.

The existing automatic gear shifting technology is commonly used as a gear shifting method adopting relay control, namely, a part of area is divided into a scanning gear area in a main scanning circuit, circuit modules with different gears are arranged in the area in parallel, each path is a gear module, each path is connected with the main scanning circuit by adopting a relay, and the relay is controlled to work by a remote instruction, so that only one path of gear module is communicated with a main circuit at each time, and other gear modules are disconnected with the main circuit. This way a remote automatic control of the circuit gear is achieved, but the following disadvantages exist.

(1) Because the relay is added in the scanning circuit and the additional capacitor is introduced, the capacitance reactance of the circuit is increased, and the slope and the linearity of the scanning pulse are influenced.

(2) The impulse response of the circuit becomes slow and the signal trigger delay becomes large.

(3) Because the relay in each path is always connected with the main circuit, the pulse signal generated by the main circuit is easy to generate oscillation echo, and the quality of the output pulse signal is poor.

Disclosure of Invention

Based on the above, the present invention provides a shift device for a scanning camera, which solves the problems of scan pulse influence, increased signal trigger delay, and poor signal output quality in the automatic shift process of the scanning camera.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a gear shifting device of a scanning camera, which comprises a base, a driving piece, a gear shifting mechanism and a connecting piece, wherein the driving piece and the gear shifting mechanism are arranged on the base; the driving piece can drive the shifting mechanism to shift in a first direction through the connecting piece; the gear shifting mechanism is provided with a first circuit board, the first circuit board is provided with a plurality of groups of contacts arranged along the first direction, each group of contacts comprises a positive contact and a negative contact, and when the gear shifting mechanism moves to a gear position, at least one group of the positive contact and the negative contact can be conducted with a second circuit board.

Optionally, the shift mechanism includes a carrier, a sliding member, and the first circuit board disposed on the sliding member, the connecting member is used to connect the driving member and the sliding member, and the driving member can drive the sliding member to slide on the carrier along the first direction through the connecting member.

Optionally, it includes two relative fixed blocks that set up to hold carrier, two the fixed block is all followed the spout has been seted up to the first direction, the slider is equipped with two sliders, two the slider can be followed two the spout slides.

Optionally, the driving part is a linear motor, the connecting part comprises a threaded sleeve and a connecting plate arranged on one side of the threaded sleeve, the threaded sleeve is rotatably connected with a stud of the linear motor, and the connecting plate is fixedly connected with the sliding part.

Optionally, an avoidance groove is formed in the first circuit board and arranged in the first direction, and the stud can move in the avoidance groove.

Optionally, the linear motor is fixed to the base through a fixing plate, the fixing plate includes a first plate and a second plate, the planes of the first plate and the second plate are perpendicular to each other, the linear motor is fixed to the first plate through screws, fixing holes are formed in the second plate, and the screws penetrate through the fixing holes to fix the fixing plate to the base.

Optionally, the fixing hole is a waist-shaped hole, and an opening direction of the waist-shaped hole is perpendicular to the first direction.

Optionally, the linear motor is disposed above the base.

Optionally, the scanning camera gear shifting device further includes a limiting member, and the limiting member can limit a stroke of the gear shifting mechanism.

A scanning camera, comprising the scanning camera gear shifting device according to any one of the above technical solutions.

The invention has the beneficial effects that:

the invention provides a gear shifting device of a scanning camera, which comprises a base, a driving piece, a gear shifting mechanism and a connecting piece, wherein the driving piece and the gear shifting mechanism are arranged on the base; the driving piece can drive the gear shifting mechanism to shift gears in a first direction through the connecting piece; the gear shifting mechanism is provided with a first circuit board, the first circuit board is provided with a plurality of groups of contacts arranged along a first direction, each group of contacts comprises a positive contact and a negative contact, and when the gear shifting mechanism moves to a gear position, at least one group of positive contacts and at least one group of negative contacts can be conducted with a second circuit board.

The driving piece drives the gear shifting mechanism to move through the connecting piece, and in the moving process of the gear shifting mechanism, the positive contact and the negative contact in each group of contacts on the first circuit board are simultaneously connected or separated with or from the second circuit board, so that the positive circuit and the negative circuit on the second circuit board are simultaneously connected or disconnected. In the switching process of the gear, no redundant capacitor device is introduced, the slope normalization of the scanning pulse is facilitated, the circuit shock response is fast, and the signal trigger delay is reduced; in addition, the positive and negative electrode circuits are simultaneously accessed in the gear shifting process, so that the risk of oscillation echo of the pulse signal in the second circuit board is reduced, and the quality of the output pulse signal is improved.

Drawings

Fig. 1 is a schematic structural diagram of a scanning camera gear shifting device provided by an embodiment of the invention;

FIG. 2 is a schematic diagram of a scanning camera shift device according to an embodiment of the present invention engaged with a second circuit board;

fig. 3 is a partial enlarged view of a portion a in fig. 2 according to an embodiment of the present invention.

In the figure:

1. a base; 11. a hole; 2. a linear motor; 21. a fixing plate; 3. a gear shift mechanism; 31. a fixed block; 32. a chute; 33. a slider; 4. a connecting member; 41. a threaded sleeve; 42. a connecting plate; 5. a first circuit board; 51. a contact; 52. an avoidance groove; 6. a second circuit board; 61. connecting sheets; 62. an arc-shaped hook; 7. and a limiting member.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Fig. 1 is a schematic structural diagram of a scanning camera gear shifting device provided by an embodiment of the invention; FIG. 2 is a schematic diagram of a scanning camera shift device according to an embodiment of the present invention engaged with a second circuit board; fig. 3 is a partial enlarged view of a portion a in fig. 2 according to an embodiment of the present invention, and referring to fig. 1 to 3, the embodiment provides a gear shifting device for a scanning camera, which includes a base 1, a driving member and a gear shifting mechanism 3 mounted on the base 1, and a connecting member 4 connecting the driving member and the gear shifting mechanism 3; the driving piece can drive the gear shifting mechanism 3 to shift gears in a first direction through the connecting piece 4; the gear shifting mechanism 3 is provided with a first circuit board 5, the first circuit board 5 is provided with a plurality of groups of contacts 51 arranged along a first direction, each group of contacts 51 comprises a positive contact and a negative contact, and when the gear shifting mechanism 3 moves to a gear position, at least one group of positive contacts and at least one group of negative contacts can be conducted with the second circuit board 6. In this embodiment, specifically, the second circuit board 6 is fixed to the base 1 and located above the first circuit board 5, the first circuit board 5 is provided with seven sets of contacts 51 arranged along the first direction, that is, seven gears, each gear includes two pairs of positive contacts and negative contacts, each pair of positive contacts and negative contacts can communicate with one circuit, and each gear shift can achieve communication between two circuits; in other embodiments, two, three, four, five, six, or eight, ten gears on the first circuit board 5 may be provided, and 3, four, or even ten pairs of contacts 51 may be provided on each gear to communicate multiple circuits on each gear.

In the process that the gear shifting mechanism 3 drives the first circuit board 5 to move, the first circuit board 5 and the second circuit board 6 generate relative displacement, and at the moment, the contact 51 of each gear on the first circuit board 5 is connected or separated with the connecting sheet 61 on the second circuit board 6 at the same time, so that the positive and negative circuits on the second circuit board 6 are connected or disconnected at the same time. In the switching process of the gear, no redundant capacitor device is introduced, so that the influence on the slope of the scanning pulse is favorably reduced, the impact response of the circuit is fast, and the signal trigger delay is reduced. In addition, the positive and negative electrode circuits are simultaneously accessed in the gear shifting process, so that the risk of oscillation echo of the pulse signal in the second circuit board 6 is reduced, and the quality of the output pulse signal is improved.

In the present embodiment, the shift mechanism 3 preferably includes a carrier, a slider 33, and a first circuit board 5 disposed on the slider 33, and the connecting member 4 is used to connect a driving member and the slider 33, and the driving member can drive the slider 33 to slide on the carrier in the first direction through the connecting member 4. The sliding of the sliding part 33 on the bearing part drives the first circuit board 5 and the second circuit board 6 to generate relative displacement, so that the moving process is relatively stable, and the structure is simple and the durability is good.

About bearing the setting of carrier, bear the fixed block 31 that the carrier includes two relative settings, two fixed blocks 31 have all been seted up spout 32 along the first direction, and slider 33 is equipped with two sliders, and two sliders can slide along two spouts 32 respectively. In the present embodiment, specifically, two sliding blocks are disposed on two sides of the sliding member 33, and the openings of the two sliding grooves 32 are disposed opposite to each other. This setting makes slider 33 press from both sides and locates between two fixed blocks 31, has avoided the stack use of slider 33 and fixed block 31, has reduced the thickness size of gearshift 3, and is favorable to slider 33 to slide steadily between two fixed blocks 31. In addition, the sliding groove 32 is convenient to design and process, which is beneficial to improving the design and processing efficiency and reducing the production cost.

Since the contact 51 protrudes from the first circuit board 5, when the first circuit board 5 and the second circuit board 6 are relatively displaced, the connecting sheet 61 on the second circuit board 6 and the contact 51 on the first circuit board 5 are contacted and scraped back and forth. In order to prevent the contact 51 from being scraped off, the connecting sheet 61 is further soldered to the second circuit board 6, the end of the connecting sheet 61 contacting the contact 51 is provided with an arc hook 62, and the back of the arc hook 62 can contact the contact 51, which can improve the service life of the contact 51, and thus the service life of the present embodiment. Of course, in other embodiments, a ball of conductive material may also be soldered to the contact end of the contact 51 and the connecting pad 61.

The driving part is a linear motor 2, the connecting part 4 comprises a threaded sleeve 41 and a connecting plate 42 arranged on one side of the threaded sleeve 41, the threaded sleeve 41 is rotatably connected with a stud of the linear motor 2, and the connecting plate 42 is fixedly connected with the sliding part 33. The linear motor 2 drives the threaded sleeve 41 to move along the axial direction of the threaded stud through the rotating threaded stud. Further, in this embodiment, the precision of the linear motor 2 can be selected to be micron-sized, and the moving step length and the moving speed thereof are both adjustable, so that the linear motor can meet different requirements on the number of gears and the gear switching speed.

In addition, the linear motor 2 is a standard component, and the size of a part matched with the linear motor 2 is easily obtained according to model selection in the design process, so that the design efficiency is improved.

In order to further reduce the assembled size of the present embodiment, the first circuit board 5 is provided with an escape groove 52 provided in the first direction, and the stud is movable in the escape groove 52. In the present embodiment, specifically, the depth and the width of the avoiding groove 52 need to be determined according to the relative position between the stud and the first circuit board 5, and the length of the avoiding groove 52 needs to be determined according to the relative displacement that can be generated between the first circuit board 5 and the stud. In the present embodiment, it is preferable that the width dimension of the avoidance groove 52 is larger than the diameter dimension of the stud, the length dimension of the avoidance groove 52 is larger than the distance between the contacts 51 at both ends on the first circuit board 5, and the depth dimension of the avoidance groove 52 is the same as the thickness dimension of the first circuit board 5. When the first circuit board 5 is processed, a part of the first circuit board is removed, which is beneficial to improving the processing efficiency. This setting makes this embodiment compact structure, can reduce whole scanning camera gearshift's volume. In other embodiments, the avoiding groove 52 may be configured in combination with the specific structure of the connecting element 4 and the specific installation manner of the connecting element 4 and the sliding element 33, so as to ensure that the stud of the linear motor 2 does not interfere with other components during the movement process over the first circuit board 5. For example, the avoiding groove 52 may also be provided in the sliding member 33, and the avoiding groove 52 may also be provided in both the sliding member 33 and the first circuit board 5. Furthermore, a hole 11 is formed in the base 1 below the sliding member 33, the hole 11 penetrates through the base 1, the width of the hole 11 is equal to the width of the sliding member 33, and the length of the hole 11 is greater than the sum of the length of the sliding member 33 and the distance between the two end contacts 51 on the first circuit board 5. This arrangement enables the slider 33 to be slid without interference with the base 1 or the stud of the linear motor 2 to be rotated.

Preferably, the linear motor 2 is fixed to the base 1 through a fixing plate 21, the fixing plate 21 includes a first plate and a second plate, the planes of the first plate and the second plate are perpendicular to each other, the linear motor 2 is fixed to the first plate through screws, and fixing holes are formed in the second plate, and the screws penetrate through the fixing holes to fix the fixing plate 21 to the base 1. In this embodiment, the fixing plate 21 may be an L-shaped plate. Regarding the arrangement of the fixing holes, the fixing holes are waist-shaped holes, and the opening direction of the waist-shaped holes is perpendicular to the first direction. The setting in waist type hole is convenient for adjust the position when installation linear electric motor 2 to make linear electric motor 2's double-screw bolt and the connecting piece 4 that is fixed in gearshift 3 can be better cooperation, avoid because precision error leads to the problem of unable assembly, improve the installation effectiveness.

Because linear electric motor 2 is the metal casing, set up its unsettled in the base 1 top, be favorable to self heat dissipation. The linear motor 2 is disposed above the base 1 in this embodiment.

In this embodiment, preferably, the gear shifting device of the scanning camera further includes a limiting member 7, and the limiting member 7 can limit the stroke of the gear shifting mechanism 3. In this embodiment, when the sliding member 33 in the shift mechanism 3 touches the limiting member 7, the shift mechanism 3 stops moving, and at this time, the stroke of the shift mechanism 3 is set to zero, and the limiting member 7 is arranged to prevent the shift mechanism 3 from colliding with other parts due to a program failure in the moving process. In the present embodiment, specifically, the sliding member 33 moves to the initial position at a fast speed and then moves to the designated position at a slow speed to connect all the contacts 51 of the same shift position with the connecting plate 61, and during the shifting process, all the contacts 51 are not electrified, and the circuit is completed when the shifting process is completed. When the sliding part 33 returns to the initial position, the sliding part touches the limiting part 7, and at the moment, the displacement data of the sliding part 33 is set to zero, so that the influence on gear shifting caused by errors accumulated in the repeated action process is eliminated, and the precision of gears is improved to a certain extent.

A scanning camera comprising a scanning camera gear shifting apparatus as referred to in any of the above embodiments.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A scanning camera gear shifting device is characterized by comprising a base (1), a driving piece and a gear shifting mechanism (3) which are arranged on the base (1), and a connecting piece (4) for connecting the driving piece and the gear shifting mechanism (3); the driving piece can drive the gear shifting mechanism (3) to shift gears in a first direction through the connecting piece (4);

be equipped with first circuit board (5) on gearshift (3), be equipped with on first circuit board (5) and follow multiunit contact (51) that first direction was arranged, every group contact (51) all include anodal contact and negative pole contact, work as when gearshift (3) remove the shelves position, at least a set of anodal contact with the negative pole contact can switch on with second circuit board (6).

2. The scanning camera gear shifting device according to claim 1, characterized in that the gear shifting mechanism (3) comprises a carriage, a slider (33) and the first circuit board (5) arranged on the slider (33), the connecting member (4) being adapted to connect the driving member and the slider (33), the driving member being adapted to drive the slider (33) to slide on the carriage in the first direction via the connecting member (4).

3. The scanning camera gear shifting device according to claim 1, characterized in that the carrier comprises two oppositely arranged fixed blocks (31), both fixed blocks (31) having a sliding slot (32) along the first direction, and the sliding member (33) having two sliding blocks, both sliding blocks being capable of sliding along both sliding slots (32).

4. The scanning camera gearshift of claim 2, wherein the driving member is a linear motor (2), the connecting member (4) comprises a threaded sleeve (41) and a connecting plate (42) disposed on one side of the threaded sleeve (41), the threaded sleeve (41) is rotatably connected to a stud of the linear motor (2), and the connecting plate (42) is fixedly connected to the sliding member (33).

5. The scanning camera gear shifting device according to claim 4, characterized in that an avoidance slot (52) is provided on the first circuit board (5) along the first direction, the stud being movable in the avoidance slot (52).

6. The scanning camera gear shifting device according to claim 4, characterized in that the linear motor (2) is fixed to the base (1) by a fixing plate (21), the fixing plate (21) comprises a first plate and a second plate perpendicular to each other in the plane, the linear motor (2) is fixed to the first plate by a screw, the second plate is provided with a fixing hole, and the screw penetrates through the fixing hole to fix the fixing plate (21) to the base (1).

7. The scanning camera shifting device of claim 6, wherein the fixing hole is a kidney-shaped hole, and the kidney-shaped hole is opened in a direction perpendicular to the first direction.

8. Scanning camera gear shifting device according to claim 6, characterized in that the linear motor (2) is arranged above the base (1).

9. The scanning camera gear shifting device according to claim 1, characterized in that it further comprises a stop (7), said stop (7) being able to limit the travel of said gear shifting mechanism (3).

10. A scanning camera, characterized in that it comprises a scanning camera gear shifting device according to any one of claims 1 to 9.

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