Stage lights with precise scanning angle positioning

Abstract

The utility model provides a stage light with precise scanning angle positioning, the stage light comprises: a base; a support arm, pivoted on the base; a lamp head, pivoted between the support arms; a driving assembly, used to drive the lamp head and / or the support arm to rotate; the pivot axis of the lamp head or the pivot axis of the support arm is connected with a detection wheel, during the rotation of the lamp head or the support arm, the maximum rotation angle of the detection wheel relative to its own zero position is less than 360°, and the rotation angle of the detection wheel relative to its own zero position is detected by a first absolute angle encoder; the pivot axis of the driving assembly is connected with a driving wheel, and the rotation angle of the driving wheel relative to its own zero position is detected by a second absolute angle encoder. The utility model improves the accuracy of the rotation angle detection of the stage light.

Description

Technical Field

[0001] The utility model relates to the technical field of stage lamps, in particular to a stage lamp with accurate scanning angle positioning. Background Art

[0002] With the expansion of stage venues, some stages are built far away from stage lights, or some extra-large performances have large stages, and stage lights need to illuminate at a very long distance, so the positioning of stage lights is required to be accurate enough to avoid deviations during long-distance projection. In some application scenarios, after the motor is started, the projection position of the light spot must be the same as before power-on, or the offset must be within a very small range.

[0003] Some existing lamps use angle detectors installed on the shaft of the driving motor of the lamp head or support arm to indirectly measure the rotation angle of the lamp head or support arm. However, the transmission belt between the driving motor and the pivot shaft of the lamp head or support arm generally has a certain elasticity, and sometimes there will be tooth jumping, so the final angle measurement result will deviate from the actual result. The angle detectors of other lamps are directly attached to the pivot shaft of the lamp head or support arm to directly measure its rotation angle, but this will be affected by the accuracy of the angle detector. The accuracy of the photoelectric encoder and magnetic encoder in the angle detector is limited, and the inductive encoder has high accuracy but high cost. Therefore, the existing conventional stage lights are not suitable for low-cost solutions for precise long-distance projection positioning. Summary of the invention

[0004] The utility model provides a stage light with accurate scanning angle positioning, which is used to solve the defect of low precision in the detection of rotation angle of the stage light in the prior art and improve the detection precision of the rotation angle of the stage light.

[0005] The utility model provides a stage light with accurate scanning angle positioning, comprising:

[0006] Base;

[0007] A support arm, pivotally connected to the base;

[0008] A lamp holder, pivotally connected between the support arms;

[0009] A driving assembly, used for driving the lamp head and / or the supporting arm to rotate;

[0010] The pivot axis of the lamp holder or the pivot axis of the support arm is connected with a detection wheel, and during the rotation of the lamp holder or the support arm, the maximum rotation angle of the detection wheel relative to its own zero position is less than 360°, and the rotation angle of the detection wheel relative to its own zero position is detected by a first absolute angle encoder;

[0011] The pivot shaft of the driving assembly is connected to a driving wheel, and the rotation angle of the driving wheel relative to its own zero point position is detected by a second absolute angle encoder.

[0012] According to a stage light with precise scanning angle positioning provided by the utility model, the second absolute angle encoder is an absolute photoelectric angle encoder.

[0013] According to a stage light with precise scanning angle positioning provided by the utility model, the photoelectric angle encoder includes a code disk, a first photoelectric angle detector and a second photoelectric angle detector;

[0014] The code disc comprises an inner ring, an outer ring and a fixing hole, wherein the inner ring is located inside the outer ring, and the fixing hole is used to fix the code disc on the driving wheel;

[0015] The first photoelectric angle detector is used to detect the rotation angle of the inner ring;

[0016] The second photoelectric angle detector is used to detect the rotation angle of the outer ring.

[0017] According to a stage lamp with precise scanning angle positioning provided by the utility model, the pivot shaft of the lamp head is connected with a driven wheel, the maximum rotation angle of the pivot shaft of the lamp head is less than 360°, and the driven wheel directly serves as the detection wheel.

[0018] According to the stage lamp with precise scanning angle positioning provided by the utility model, the driven wheel connected to the pivot shaft of the lamp head and the driving wheel connected to the driving assembly driving the lamp head to rotate are both located in the support arm.

[0019] According to a stage light with precise scanning angle positioning provided by the utility model, the support arm is connected to a driven wheel relative to a pivot axis of the base, the maximum rotation angle of the pivot axis is greater than 360°, and the detection wheel is directly or indirectly engaged with the driven wheel to convert the angle detection of the driven wheel exceeding 360° to an angle within 360° of the detection wheel for detection.

[0020] According to the stage light with precise scanning angle positioning provided by the utility model, the rotation angle of the support arm is 500° to 700°.

[0021] According to a stage light with precise scanning angle positioning provided by the utility model, the driven wheel and the detection wheel connected to the pivot axis of the support arm relative to the base are located in the base, and the driving wheel connected to the driving assembly that drives the support arm to rotate is located in the support arm.

[0022] According to a stage lamp with precise positioning of scanning angle provided by the utility model, the support arm is provided with a wire passing hole relative to the pivot axis of the base.

[0023] According to a stage light with precise scanning angle positioning provided by the utility model, the maximum rotation angle of the detection wheel is 345° to 359°.

[0024] According to a stage light with precise scanning angle positioning provided by the utility model, the first absolute angle encoder is an absolute magnetic angle encoder.

[0025] The utility model provides a stage light with precise scanning angle positioning. During the rotation of the lamp head or the support arm, a first absolute angle encoder is used to obtain the rotation angle of a detection wheel connected to the pivot shaft of the lamp head or the support arm relative to its own zero point position. A second absolute angle encoder is used to obtain the rotation angle of a driving wheel connected to the pivot shaft of a driving component relative to its own zero point position. By using two absolute angle encoders arranged at different positions to perform rotation angle detection, the accuracy of rotation angle detection of the stage light is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the stage light with accurate scanning angle positioning provided by the utility model;

[0028] Figure 2 This is a schematic diagram of the assembly structure of a stage light with precise scanning angle positioning provided by the utility model;

[0029] Figure 3 It is an exploded schematic diagram of a stage light with accurate positioning of scanning angle provided by the utility model;

[0030] Figure 4 This is a schematic diagram of the rotation angle detection control process of the stage light with accurate scanning angle positioning provided by the utility model;

[0031] Figure 5 It is a structural schematic diagram of a photoelectric encoder for stage lights with accurate scanning angle positioning provided by the utility model;

[0032] Figure 6 This is a schematic diagram of the circuit structure of a stage light with precise scanning angle positioning provided by the utility model;

[0033] Figure 7 The utility model is a schematic diagram of pulses output by the outer ring photoelectric switch channel of the photoelectric encoder in the stage light with accurate scanning angle positioning.

[0034] Reference numerals:

[0035] 01: lamp holder; 02: support arm; 03: drive assembly; 04: base; 05: second absolute angle encoder; 1: code disc 1; 11: inner ring; 12: outer ring; 13: fixing hole; 2: first photoelectric angle detector; 3: second photoelectric angle detector; 4: side gear assembly; 5: stepper motor; 6: motor drive and control board; 7: fixing frame; 8: wire sleeve; 9: encoder bearing belt; 10: horizontal sleeve assembly; 11: horizontal sleeve fixing frame; 12: spindle fixing plate; 13: first magnetic encoder fixing frame; 14: first copper column; 15: first photoelectric angle detector; 16: magnet; 17: encoder plate fixing sleeve; 18: encoder sleeve fixing plate; 19: encoder bearing belt; 20: second magnetic encoder fixing frame; 21: second copper column. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Combine the following Figures 1 to 7 The utility model is a stage light with accurate scanning angle positioning, comprising:

[0038] Base 04;

[0039] The support arm 02 is pivotally connected to the base 04;

[0040] The lamp head 01 is pivotally connected between the support arms 02;

[0041] A driving assembly 03, used for driving the lamp head 01 and / or the supporting arm 02 to rotate;

[0042] The pivot axis of the lamp holder 01 or the pivot axis of the support arm 02 is connected with a detection wheel. During the rotation of the lamp holder 01 or the support arm 02, the maximum rotation angle of the detection wheel relative to its own zero position is less than 360°, and the rotation angle of the detection wheel relative to its own zero position is detected by a first absolute angle encoder 15;

[0043] The pivot shaft of the driving assembly 03 is connected to a driving wheel, and the rotation angle of the driving wheel relative to its own zero position is detected by a second absolute angle encoder 05 .

[0044] like Figure 1 As shown, the support arm 02 is pivotally connected to the base 04 to form a U-shaped support arm. The lamp head 01 is pivotally connected between the two arms of the U-shaped support arm.

[0045] Figure 2 This is the assembly diagram of the stage light. Figure 3 yes Figure 2 The driving assembly 03 includes a stepping motor 5, and the rotation of the stepping motor 5 drives the lamp head 01 and / or the support arm 02 to rotate.

[0046] The detection wheel is the encoder plate fixed shaft sleeve 17. When the detection wheel rotates infinitely, the maximum rotation angle is greater than 360°, and it returns to the zero position after each rotation. In this embodiment, the maximum rotation angle of the detection wheel relative to its own zero position is limited to less than 360°.

[0047] The zero position of the rotation angle of the detection wheel or driving wheel relative to its own zero position is different from the zero position of the maximum rotation angle of the detection wheel relative to its own zero position. The rotation angle of the detection wheel or driving wheel relative to its own zero position refers to the angle of rotation of the driving wheel or the detection wheel when the lamp head 01 or the support arm 02 is at a certain angle (usually the extreme position of rotation of the lamp head 01 or the support arm 02).

[0048] The first absolute angle encoder 15 is used to detect the rotation angle of the detection wheel relative to its own zero position, and the second absolute angle encoder 05 is used to detect the rotation angle of the driving wheel relative to its own zero position. Among them, the absolute angle encoder refers to an angle encoder that can know any angle position within one circle after power failure and restart, but cannot count the number of circles.

[0049] The first absolute angle encoder 15 is arranged on the encoder plate fixing sleeve 17, the second absolute angle encoder 05 is arranged on the side gear assembly 4, the side gear assembly 4 is arranged on the stepping motor 5, and the side gear assembly 4 is the driving wheel.

[0050] The first magnetic encoder fixing frame 13 , the first copper column 14 , the second magnetic encoder fixing frame 20 and the second copper column 21 are used to fix the first absolute angle encoder 15 and the encoder plate fixing sleeve 17 on the spindle fixing plate 12 .

[0051] A magnet 16, an encoder sleeve fixing plate 18 and an encoder bearing belt 19 are also provided between the first magnetic encoder fixing frame 13 and the second magnetic encoder fixing frame 20. The magnet 16 is located between the first absolute angle encoder 15 and the encoder plate fixing sleeve 17, the encoder plate fixing sleeve 17 is fixed on the encoder sleeve fixing plate 18, and the encoder bearing belt 19 is sleeved on the encoder plate fixing sleeve 17.

[0052] The stage light also includes a motor drive and control board 6, which is connected to the first absolute angle encoder 15 and the second absolute angle encoder 05. The motor drive and control board 6 calculates the rotation period of the driving wheel according to the first absolute angle encoder 15 and the transmission ratio between the detection wheel and the driving wheel, and calculates the full rotation angle of the driving wheel in combination with the rotation angle of the driving wheel in the current rotation period detected by the second absolute angle encoder 05, and again obtains the current position of the lamp head 01 or the support arm 02 through the transmission ratio between the detection wheel and the driving wheel. One complete rotation period is one circle. The control process of the stage light rotation angle detection is as follows. Figure 4 shown.

[0053] This embodiment uses a first absolute angle encoder to obtain the rotation angle of the detection wheel connected to the pivot shaft of the lamp head or the support arm relative to its own zero point position during the rotation of the lamp head or the support arm, and uses a second absolute angle encoder to obtain the rotation angle of the driving wheel connected to the pivot shaft of the driving component relative to its own zero point position. By using two absolute angle encoders set at different positions to perform rotation angle detection, the accuracy of rotation angle detection of the stage light is improved.

[0054] On the basis of the above embodiment, in this embodiment, the second absolute angle encoder 05 is an absolute photoelectric angle encoder.

[0055] The second absolute angle encoder 05 may also be an inductive or capacitive angle encoder.

[0056] Based on the above embodiments, Figure 5 As shown, in this embodiment, the second absolute angle encoder 05 includes a code disk 1, a first photoelectric angle detector 2 and a second photoelectric angle detector 3;

[0057] The code disc 1 comprises an inner ring 11, an outer ring 12 and a fixing hole 13, wherein the inner ring 11 is located inside the outer ring 12, and the fixing hole 13 is used to fix the code disc 1 on the driving wheel;

[0058] The first photoelectric angle detector 2 is used to detect the rotation angle of the inner ring 11;

[0059] The second photoelectric angle detector 3 is used to detect the rotation angle of the outer ring 12 .

[0060] The code disc 1 in the prior art has only an outer ring 12. The code disc 1 in this embodiment includes an outer ring 12 and an inner ring 11, and a first photoelectric angle detector 2 is added to detect the rotation angle of the inner ring 11. Figure 6 Add inner circle horizontal and vertical photoelectric drive circuits.

[0061] For example, Figure 7 As shown, when the second absolute angle encoder 05 rotates clockwise, the waveform output by the outer ring photoelectric switch channel A leads the waveform output by channel B by 90°, the waveform output by channel A, W1, is high level, and the waveform output by channel A, W2, is low level, and the pulse signal is sent to the MCU (Microcontroller Unit) for addition counting. When the outer ring photoelectric switch encoder rotates counterclockwise, the waveform output by channel A lags 90° behind the waveform output by channel B, the waveform output by channel A, W1, is high level, and the waveform output by channel A, W2, is low level, and the pulse signal is sent to the MCU for subtraction counting, so that forward or reverse rotation can be distinguished and the relevant angle can be measured at the same time.

[0062] On this basis, if a higher precision subdivision is required, as the number of subdivisions increases, more outer ring gratings are required, but to a certain extent, the processing requirements are higher, which increases the production cost and design difficulty. This embodiment adds inner ring photoelectric switch detection to improve the relevant resolution, such as using interpolation to further improve the resolution. Add a dedicated additional code channel, and the series of pulse signals output by the additional code channel of the inner ring are superimposed with the pulse signals output by the A and B channels of the outer ring in the interpolator according to different coefficients to form a signal output with different phase shifts, thereby subdividing the output signal of the additional code channel and generating additional low-order valid values. For example, in a 19-bit absolute photoelectric angle encoder, the interpolator generates 18 level signals. The phase difference between every two AB signals of the outer ring photoelectric is π / 8, so 36 precisely divided points are inserted in the least significant numerical interval of the 14-bit encoder, which is equivalent to the output of an additional 5-bit binary number, so that the resolution of the absolute photoelectric angle encoder is increased from 2 to the 14th power to 2 to the 19th power, and the angular displacement is less than 3 seconds, thereby improving the accuracy of angle detection.

[0063] On the basis of the above-mentioned embodiment, in this embodiment, the pivot shaft of the lamp holder 01 is connected with a driven wheel, the maximum rotation angle of the pivot shaft of the lamp holder is less than 360°, and the driven wheel directly serves as the detection wheel.

[0064] The driven wheel connected to the pivot shaft of the lamp holder 01 is a horizontal sleeve assembly 10. The horizontal sleeve assembly 10 is sleeved with an encoder bearing belt 9 and a wire sleeve 8. The fixing frame 7 and the horizontal sleeve fixing frame 11 are used to fix the horizontal sleeve assembly 10 on the main shaft fixing plate 12.

[0065] On the basis of the above-mentioned embodiment, in this embodiment, the driven wheel connected to the pivot shaft of the lamp head 01 and the driving wheel connected to the driving assembly 03 driving the lamp head to rotate are both located in the support arm 02 .

[0066] On the basis of the above-mentioned embodiment, in this embodiment, the support arm 02 is connected to a driven wheel at a pivot axis relative to the base 04, the maximum rotation angle of the pivot axis is greater than 360°, and the detection wheel is directly or indirectly engaged with the driven wheel to convert the angle detection of the driven wheel exceeding 360° to an angle within 360° of the detection wheel for detection.

[0067] The detection wheel and the driven wheel can be indirectly meshed through a belt.

[0068] On the basis of the above embodiment, the rotation angle of the support arm 02 in this embodiment is 500° to 700°.

[0069] The support arm can rotate up to 540°.

[0070] Based on the above embodiments, in this embodiment, the driven wheel and the detection wheel connected to the pivot axis of the support arm 02 relative to the base 04 are located in the base 04, and the driving wheel connected to the driving component 03 that drives the support arm 02 to rotate is located in the support arm 02.

[0071] On the basis of the above-mentioned embodiment, in this embodiment, a through-hole is provided on the pivot axis of the support arm 02 relative to the base 04 .

[0072] On the basis of the above embodiment, the maximum rotation angle of the detection wheel in this embodiment is 345° to 359°.

[0073] On the basis of the above embodiment, in this embodiment, the first absolute angle encoder 15 is an absolute magnetic angle encoder.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A stage light with precise scanning angle positioning, characterized in that: include: Base; A support arm, pivotally connected to the base; A lamp holder, pivotally connected between the support arms; A driving assembly, used for driving the lamp head and / or the supporting arm to rotate; The pivot axis of the lamp holder or the pivot axis of the support arm is connected with a detection wheel, and during the rotation of the lamp holder or the support arm, the maximum rotation angle of the detection wheel relative to its own zero position is less than 360°, and the rotation angle of the detection wheel relative to its own zero position is detected by a first absolute angle encoder; The pivot shaft of the driving assembly is connected to a driving wheel, and the rotation angle of the driving wheel relative to its own zero point position is detected by a second absolute angle encoder.

2. The stage light with precise scanning angle positioning according to claim 1, characterized in that: The second absolute angle encoder is an absolute photoelectric angle encoder.

3. The stage light with precise scanning angle positioning according to claim 2, characterized in that: The photoelectric angle encoder comprises a code disc, a first photoelectric angle detector and a second photoelectric angle detector; The code disc comprises an inner ring, an outer ring and a fixing hole, wherein the inner ring is located inside the outer ring, and the fixing hole is used to fix the code disc on the driving wheel; The first photoelectric angle detector is used to detect the rotation angle of the inner ring; The second photoelectric angle detector is used to detect the rotation angle of the outer ring.

4. The stage light with precise scanning angle positioning according to claim 1, characterized in that: The pivot shaft of the lamp holder is connected with a driven wheel, the maximum rotation angle of the pivot shaft of the lamp holder is less than 360°, and the driven wheel directly serves as the detection wheel.

5. The stage light with precise scanning angle positioning according to claim 4, characterized in that: The driven wheel connected to the pivot shaft of the lamp head and the driving wheel connected to the driving assembly driving the lamp head to rotate are both located in the support arm.

6. The stage light with precise scanning angle positioning according to claim 1, characterized in that: The support arm is connected to a driven wheel at a pivot axis relative to the base, the maximum rotation angle of the pivot axis is greater than 360°, and the detection wheel is directly or indirectly engaged with the driven wheel to convert the angle detection of the driven wheel exceeding 360° to an angle within 360° of the detection wheel for detection.

7. The stage light with precise scanning angle positioning according to claim 6, characterized in that: The rotation angle of the support arm is 500° to 700°.

8. The stage light with precise scanning angle positioning according to claim 6, characterized in that: The driven wheel and the detection wheel connected to the pivot axis of the support arm relative to the base are located in the base, and the driving wheel connected to the driving assembly that drives the support arm to rotate is located in the support arm.

9. The stage light with precise scanning angle positioning according to claim 6, characterized in that: The support arm is provided with a through-hole on the pivot axis relative to the base.

10. The stage light with precise scanning angle positioning according to claim 1, characterized in that: The maximum rotation angle of the detection wheel is 345° to 359°.

11. The stage light with precise scanning angle positioning according to claim 1, characterized in that: The first absolute angle encoder is an absolute magnetic angle encoder.

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