CN115218140A

CN115218140A - Optical system for multi-mode combined dimming and method for adjusting illuminance of optical system

Info

Publication number: CN115218140A
Application number: CN202210971479.8A
Authority: CN
Inventors: 郭玮宏; 蒋旋; 原晓峰; 李涛
Original assignee: Commercial Aircraft Corp of China Ltd
Current assignee: Commercial Aircraft Corp of China Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-10-21
Anticipated expiration: 2042-08-12
Also published as: CN115218140B

Abstract

The invention relates to an optical system for multi-mode combined dimming, which comprises: a light source; a condenser lens disposed around at least a portion of the light source to condense light emitted from the light source and output the condensed light toward a predetermined direction; a lens assembly disposed on a light path of the converged light rays and parallelizing and homogenizing the converged light rays; and a mechanical dimming structure attached to the light source for changing a position of the light source relative to the collection optic. Therefore, the position of the light source relative to the condenser lens is adjusted, so that the light emitting intensity of the optical system can be dynamically adjusted according to the use requirement, the light can be adjusted in combination with the light adjusting mode of the light source, and the whole light adjusting range of the optical system is remarkably enlarged. In addition, the invention also relates to a method for adjusting the illumination of the optical system.

Description

Optical system for multi-mode combined dimming and method for adjusting illuminance of optical system

Technical Field

The present invention relates to an optical system, and more particularly, to a high power, multi-mode combination dimming optical system, which can be used for high power lighting fixture design or optical environment simulation in a laboratory. In addition, the invention also relates to a method for adjusting the illumination of the optical system.

Background

In the fields of laboratories, outdoor lighting, aircraft exterior lighting and the like, the demand on high-power lighting lamps is wide. The current light source technologies such as LED and HID (high-pressure gas discharge light source) also gradually realize the commercialization of high-power products, the power of LED module is about tens of watts, and the power of HID light source is about tens of kilowatts. However, due to the limitations of heat dissipation and volume, the realization of high-power lamp products is still difficult. For example, a high-power product required for a solar simulator needs to realize ultra-high brightness of 150000lx central illuminance, which is difficult to realize with an LED light source, and only HID (high-pressure gas discharge light source) can be adopted.

In a high-power light source, the HID is relatively mature, the spectral characteristics are good, the heat dissipation requirement of the LED is too large, and the spectrum is single. At present, the main stream of high-power lamps still mainly adopt HID light sources.

Dimming (brightness and darkness) of the LED light source is continuous variable dimming, but the conventional HID dimming adopts a driving dimming manner, and the dimming range is only about 60% -100%. Therefore, realizing ultra-high brightness light source and realizing deep dimming (below 40%) are a pair of technical contradictions.

Accordingly, there is a significant need to provide an improved optical system that overcomes one or more of the shortcomings of the prior art.

Disclosure of Invention

The invention aims to provide a high-power multi-mode combined dimming uniform optical system to realize curing and batch production of high-power illuminating lamps, and related technologies can also be applied to high-power aircraft illuminating light source designs such as landing lamps and navigation lamps or optical environment simulation of various illumination tests.

According to an aspect of the present invention, there is provided an optical system for multi-mode combination dimming, the optical system may include:

a light source;

a condensing lens that may be disposed around at least a portion of the light source to condense light emitted from the light source and output the condensed light toward a predetermined direction;

a lens assembly which may be disposed on a light path of the converged light rays and parallelizes and homogenizes the converged light rays; and

a mechanical dimming structure attachable to the light source for changing a position of the light source relative to the collection optic.

Therefore, the light intensity of the optical system can be dynamically adjusted according to the use requirement by adjusting the position of the light source relative to the condenser lens, and the light can be adjusted by combining with the light adjusting mode of the light source, so that the whole light adjusting range of the optical system is remarkably enlarged.

According to the above aspect of the present invention, preferably, the lens assembly may include:

a first lens that diverges an exit angle of the converged light beam;

a second lens arranged downstream of the first lens and comprising an array of fly-eye lenses for homogenizing and, in cooperation with the first lens, collimating the light beam.

In this way, the light beam condensed by the condenser lens can be output as a homogenized and parallelized light beam.

According to the above aspect of the present invention, preferably, the second lens may include a plurality of individual discrete lenses, the discrete lenses being in a hexagonal structure, and the discrete lenses abutting each other to form a fly-eye lens array in a honeycomb arrangement. The plurality of discrete lenses can break up the light beam from the first lens to achieve homogenization of the light beam/ray.

According to the above aspect of the present invention, preferably, the mechanical dimming structure may include:

a drive motor;

the movable bracket bears the light source; and

and the fixed moving track bears the moving bracket, so that the moving bracket is driven by the driving motor to move along the fixed moving track.

The movable support is controlled to move along the fixed movable track through the motor, so that the light source is driven to move, the distance between the light source and the condensing lens is changed, the light intensity of the optical system can be dynamically adjusted conveniently and reliably according to use requirements, and automation can be realized.

According to the above aspect of the present invention, preferably, the mechanical dimming structure is capable of varying the actual output (e.g., actual illuminance) of the optical system within a range of 50% -100% of the actual output (e.g., actual illuminance) of the light source by changing the position of the light source with respect to the condenser lens. In this way, the entire dimming range of the optical system is further expanded on the basis of the dimming mode of the light source itself, for example, so that the actual output of the light source varies within a range of 30% to 100% of the rated output of the light source.

According to the above aspect of the present invention, preferably, the optical system for multi-mode combination dimming may further include an exit aperture disposed downstream of the second lens, and the exit aperture controls an exit aperture or an exit area. The light-emitting diaphragm can further enlarge the whole dimming range of the optical system by changing the light-emitting caliber or the light-emitting area.

According to the above aspect of the present invention, preferably, the optical system for multi-mode combination dimming may further include a heat dissipation system including a first axial flow fan disposed upstream of the condenser lens and an air guide duct disposed between the first axial flow fan and the condenser lens. Through the heat dissipation system, heat near a heat source is guided and exhausted through the axial flow fan, so that long-time and high-power work of the optical system is realized.

According to the above aspect of the present invention, preferably, the light source may include a high-pressure gas discharge light source. For example, the high-pressure gas discharge light source may be a metal halide lamp, and may be driven to dim such that its actual output varies within a range of 60% -100% of its rated output, thereby expanding the overall dimming range of the optical system while satisfying a high-power luminous flux output.

According to another aspect of the present invention, there is provided a method of adjusting the illuminance of an optical system according to the above aspect, which may comprise the steps of:

by means of driving dimming of the high-pressure gas discharge light source, the actual output of the light source is changed within the range of 60% -100% of the rated output of the light source, so that a first-stage dimming light beam is obtained;

the actual output of the first stage dimmed beam is caused to vary within 30% -100% of the nominal output of the light source by means of the mechanical dimming structure.

The use requirements can thus be met by the optical system of the invention, the disadvantages of the prior art are overcome and the intended objects are achieved.

Drawings

To further clarify the optical system according to the invention, the invention will be described in detail with reference to the drawings and the detailed description in which:

FIG. 1 is a schematic diagram of an optical structure of an optical system for multi-mode combination dimming according to a non-limiting embodiment of the present invention;

FIG. 2 is a schematic diagram of a second lens of an optical system for multi-mode combined dimming according to a non-limiting embodiment of the present invention;

FIG. 3 is a schematic diagram of a mechanical dimming architecture of an optical system for multimodal combined dimming according to a non-limiting embodiment of the present invention;

FIG. 4 is a schematic perspective view of an optical system for multi-mode combined dimming according to a non-limiting embodiment of the present invention; and

fig. 5 is a schematic diagram of a heat dissipation system of a multimode combined dimming optical system according to a non-limiting embodiment of the present invention.

The figures are purely diagrammatic and not drawn true to scale.

List of reference numbers in the figures and examples:

100-multi-mode combined dimming optical system comprising:

10-a light source;

20-a condenser;

a 30-lens combination comprising:

31-a first lens;

32-a second lens;

32A-discrete lens;

40-a mechanical dimming structure comprising:

41-drive motor;

42-moving the support;

43-a fixed moving track;

50-a light-emitting diaphragm;

60-a heat dissipation system comprising:

61-a first heat dissipating axial fan;

62-air duct.

Detailed Description

It is to be understood that the invention may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices illustrated in the attached drawings, and described in the specification are simply exemplary embodiments of the inventive concepts disclosed and defined herein. Thus, specific orientations, directions or other physical characteristics relating to the various embodiments disclosed should not be considered limiting unless expressly stated otherwise.

Fig. 1 is a schematic diagram of an optical structure of an optical system 100 for multi-mode combination dimming according to a non-limiting embodiment of the present invention.

As shown and by way of non-limiting example, a multi-mode combination-dimming optical system 100 (hereinafter also referred to simply as optical system 100) may include a light source 10, a collection optic 20, a lens combination 30, and a mechanical dimming structure 40.

The light source 10 may be disposed inside the condenser lens 20, and the light source 10 may be, for example, a high power light source for satisfying a light flux output providing a large load. For example, the light source 10 may be a high-pressure gas discharge light source (HID), and the high power light source 10 can achieve ultra high brightness of central illuminance (illumination intensity, lux or Lux) of 150000lx so as to be used as a light source of a solar simulator. Alternatively, the light source 10 may also be a high-power LED light source. The traditional HID dimming mode adopts a driving dimming mode, and the dimming range is about 60% -100%. By way of non-limiting example, the light source 10 may be a metal halide lamp.

With continued reference to fig. 1, a collection optic 20, which may be in the form of an ellipsoidal axicon collection optic as shown in the drawings, may be disposed around at least a portion of the light source 10 and surround the light source 10 in a plurality of directions (e.g., the five directions shown in the drawings). This arrangement can condense the light emitted from the light source 10 and output the condensed light toward a predetermined direction, for example, a direction not surrounded by the ellipsoidal axicon condenser, i.e., toward the right as viewed in fig. 1.

As shown in fig. 1, the lens assembly 30 may include a first lens 31 and a second lens 32 sequentially disposed on an optical path of the light condensed by the condenser lens 20. For example, the first lens 31 may diverge the exit angle of the condensed light beam; and the second lens 32 may converge the light rays so that the light beams passing through the first lens 31 and the second lens 32 are substantially parallel light beams, i.e., parallelize the light beams. Of course, alternatively, it is also possible that the first lens 31 may continue to converge the exit angle of the converged light beam; and the second lens 32 may diverge the light rays as long as the light beams passing through the first lens 31 and the second lens 32 are substantially parallel light beams.

Fig. 2 is a schematic diagram of the second lens 32 of the optical system 100 for multi-mode combination dimming according to a non-limiting embodiment of the present invention.

As shown and by way of non-limiting example, second lens 32 may include a plurality of individual discrete lenses 32A, each discrete lens 32A may be a hexagonal structure, and adjacent discrete lenses 32A abut one another to form a cellular arrangement of fly-eye lens arrays that may redirect light passing through each discrete lens 32A to form a relatively uniform brightness light beam, i.e., homogenize the light beam. For example, the light from each discrete lens is interleaved with the light from at least one adjacent discrete lens to homogenize the light beam.

In the embodiment shown in the drawings, the first lens 31 may be an axicon lens, and each discrete lens 32A in the second lens 32 may be a concave lens or a convex lens, as long as the lens combination 30 formed by the first lens 31 and the second lens 32 can form the light converged by the condenser lens 20 into a parallel and uniform light beam. Accordingly, a person skilled in the art may adjust the position, curvature, and arrangement order of the first and

second lenses

31 and 32, and may include additional lenses to achieve a desired effect.

Preferably, the positions of the first and

second lenses

31 and 32 relative to the light source 10 or the condenser lens 20 are also adjustable, for example, manually or automatically.

A mechanical dimming structure 40 may be attached to the light source 10 for changing the position of the light source 10 relative to the collection optic 20.

Fig. 3 is a schematic diagram of a mechanical dimming structure 40 of an optical system 100 for multimodal combined dimming according to a non-limiting embodiment of the present invention.

As shown and by way of non-limiting example, the mechanical dimming structure 40 may include a driving motor 41, a moving bracket 42, and a fixed moving rail 43.

For example, the drive motor 41 may be a drive motor, such as a stepper motor, to achieve as fine an adjustment range as possible, e.g. an adjustment with a continuously variable approach position.

The moving bracket 42 may be used to carry the light source 10 and may be driven by the driving motor 41, for example, the moving bracket 42 may be a substantially U-shaped structure shown in the drawings and carries the light source 10 in the middle.

The fixed moving rail 43 may carry the moving bracket 42, and may include two guide rails disposed in parallel, for example, two branches of a substantially U-shaped structure carrying the moving bracket 42 are fitted to the two guide rails of the fixed moving rail 43, so that the moving bracket 42 is driven by the driving motor 41 to move along the fixed moving rail 43.

With this structure, the driving motor 41 may drive the light source 10 to reciprocate, i.e., change the position of the light source 10 with respect to the condenser 20 (i.e., change the position of the light source 10 with respect to the focal point of the condenser 20), so that the actual output (e.g., actual illuminance) of the optical system for multimodal combination dimming 100 varies within a range of 60% -100% of the actual output (e.g., actual illuminance) of the light source 10.

Referring back to fig. 1, the optical system 100 for multi-mode combination dimming may further include an exit stop 50 disposed downstream of the second lens 32, and the exit stop 50 may be used to control an exit aperture or an exit area.

Fig. 4 is a schematic perspective view of a multimode combined dimming optical system 100 according to a non-limiting embodiment of the present invention.

As shown in fig. 1 and 4, light emitted from the high power light source 10 is reflected by a condenser 20 (e.g., an ellipsoidal axicon condenser), then is modulated by the light modulation grating 60, and then is converged and irradiated onto the first lens 31 (e.g., an axicon lens), and is homogenized by the second lens 32 (e.g., a fly eye lens array) after the exit angle of the light is adjusted, and then exits through the exit diaphragm 50, that is, the high power light source 10 is imaged on the exit diaphragm 50. If the light exit diaphragm 50 is regarded as a surface light source composed of a collection of point light sources, the illumination surface is a superposition of the illumination effects of all the point light sources, and a very uniform illumination effect can be obtained.

As a non-limiting example, in the multi-mode combined dimming optical system 100, the mechanical dimming mode is used as a supplement to the driving dimming mode, and the mechanical dimming is used to realize dimming in the range of 30% to 70%, so that the dimming range of the whole set of system reaches 30% to 100%, and the dimming range is expanded by nearly 1 time. For example, mechanical dimming and driving dimming may be multiplicative, i.e., the light output at that time can be adjusted to about 50% by mechanical dimming regardless of the state of the driving dimming. In other words, assuming that the current light source output is 100%, 50% -100% output can be achieved with mechanical dimming. However, assuming that the current light source output is 60% and mechanical dimming is adopted to 50% thereof, an output of 60% × 50% =30%, that is, 30% of the current light source output (illuminance) can be achieved for the entire optical system 100.

Thus, in application, driving dimming may be first applied at the 60% -100% stage of the light source output, and if necessary, the light source output may be fixed at 60% of its output, and then dimming within 30% -60% of its output may be achieved by mechanical dimming, for example, by means of the mechanical dimming structure 40. Thereby, dimming in the range of 30% -100% of the optical system 100 for the entire multimode combination dimming can be achieved, i.e., the intensity (illuminance) of the light beam actually output is made to vary in the range of 30% -100% of the intensity (illuminance) of the light beam of the rated output of the light source 10.

In one embodiment, from 100% to 30% light output conditions are achieved, with the measured illumination levels as shown in the following table:

measured illuminance (output) example table output by optical system 100

As a preferred embodiment, the multimode combined dimming optical system 100 may further include a heat dissipation system 60. Fig. 5 is a schematic diagram of a heat dissipation system 60 of an optical system 100 for multi-mode combination dimming according to a non-limiting embodiment of the present invention.

As shown, the heat dissipation system 60 may include a first axial heat dissipation fan 61 disposed upstream of the condenser 20 and a duct 62 disposed between the first axial heat dissipation fan 61 and the condenser 20. The axial flow fan may be any fan type known in the art for dissipating heat and therefore will not be described in detail herein.

According to the heat dissipation requirement, the interior of the multi-mode combination dimming optical system 100 may be divided into two cavities, i.e., a front cavity and a rear cavity, by taking the ellipsoidal condenser as a boundary, and the first axial cooling fan 61 (e.g., the rear axial cooling fan) drives air to be input from the air inlet of the air guide pipe 62, and the air passes through the heat source surface and then is guided and removed by the second axial cooling fan 73 (e.g., the front axial cooling fan) to take away heat.

As described above and by way of non-limiting example, a method of adjusting the illuminance of an optical system 100 for multi-mode combined dimming may comprise the steps of:

firstly, the actual output of the light source 10 can be varied within the range of 60% -100% of the rated output of the light source 10 by means of the driving dimming of the high-pressure gas discharge light source to obtain a first-stage dimming light beam; then, on the basis of the driving dimming, the actual output of the first stage dimming light beam is varied within a range of 30% -70% of the rated output of the light source 10 by means of the mechanical dimming structure 40.

Preferably, driving dimming of the high-pressure gas discharge light source is preferentially used (for example, by adjusting the magnitude of the current supplied to the light source 10) to obtain a continuously variable and stably varying dimming range as much as possible. If the desired illumination of the output light beam is not achieved after the driving dimming, the output of the light source 10 can be kept at a minimum by the driving dimming, and then the illumination of the light beam output by the light source 10 is further reduced by the mechanical dimming structure 40. In this way, it is possible in combination to achieve a regulating amplitude which varies at least in the range 30% -70% of the nominal output of the light source 10.

Of course, the above adjustment steps are exemplary and those skilled in the art may make adjustments as needed, such as first performing mechanical dimming and then performing driving dimming, or both, alternately, without departing from the scope of the present invention.

The terms "upstream", "downstream" and the like for indicating the order as used herein, which denote the orientation or direction, are used solely for the purpose of enabling a person having ordinary skill in the art to better understand the concepts of the invention as embodied in the preferred embodiments and are not intended to limit the invention. Unless otherwise specified, all sequences, orientations, or orientations are used for the purpose of distinguishing one element/component/structure from another element/component/structure only, and do not imply any particular order, sequence of operations, direction, or orientation, unless otherwise specified. For example, in an alternative embodiment, the "first lens" may be the "second lens".

In summary, the optical system 100 for multi-mode combination dimming according to the embodiments of the present invention overcomes the disadvantages of the prior art and achieves the intended purpose.

Although the multimode combination dimming optical system of the present invention has been described in connection with the preferred embodiments, it will be understood by those of ordinary skill in the art that the above examples are intended to be illustrative only and are not intended to be limiting. Therefore, various modifications and changes can be made to the present invention within the spirit and scope of the claims, and these modifications and changes will fall within the scope of the claims of the present invention.

Claims

1. An optical system (100) for multi-mode combined dimming, the optical system comprising:

a light source (10);

a condenser lens (20) disposed around at least a portion of the light source (10) to condense light emitted from the light source (10) and output the condensed light toward a predetermined direction;

a lens assembly (30) disposed on an optical path of the converged light rays and parallelizing and homogenizing the converged light rays; and

a mechanical dimming structure (40) attached to the light source (10) for changing the position of the light source (10) relative to the collection optic (20).

2. The optical system (100) for multi-mode combined dimming according to claim 1, wherein the lens combination (30) comprises:

a first lens (31) that diverges an exit angle of the converged light beam;

a second lens (32) arranged downstream of the first lens (31) and comprising an array of fly-eye lenses for homogenizing the light beam and cooperating with the first lens (31) to parallelize the light beam.

3. The optical system (100) for multimodal combined dimming according to claim 2, characterized in that the second lens (32) comprises a plurality of individual discrete lenses (32A), the discrete lenses (32A) are of hexagonal structure and the discrete lenses (32A) abut against each other to form a fly eye lens array of honeycomb arrangement.

4. The optical system (100) for multi-mode combined dimming according to claim 2, wherein the mechanical dimming structure (40) comprises:

a drive motor (41);

a mobile carriage (42) carrying the light source (10); and

a fixed moving track (43) carrying the moving carriage (42) such that the moving carriage (42) is driven by the drive motor (41) to move along the fixed moving track (43).

5. The optical system (100) for multimodal combined dimming according to claim 4, wherein the mechanical dimming structure (40) is capable of varying the actual output of the optical system (100) for multimodal combined dimming by changing the position of the light source (10) with respect to the condenser lens (20) in a range of 50-100% of the actual output of the light source (10).

6. The optical system (100) for multimodal combined dimming as claimed in claim 2, wherein the optical system (100) for multimodal combined dimming further comprises an exit stop (50) arranged downstream of the second lens (32), the exit stop controlling an exit aperture or an exit area.

7. The optical system (100) for multi-mode combination dimming according to any of claims 1-6, characterized in that the optical system (100) for multi-mode combination dimming further comprises a heat dissipation system (60) comprising a first axial heat dissipating fan (61) arranged upstream of the condenser mirror (20) and a wind guiding duct (62) arranged between the first axial heat dissipating fan (61) and the condenser mirror (20).

8. The optical system (100) for multimodal combined dimming according to any of claims 1-6, wherein the light source (10) comprises a high pressure gas discharge light source.

9. A method of adjusting the illuminance of an optical system (100) as claimed in claim 8, the method comprising the steps of:

-varying the actual output of the light source (10) within the range of 60% -100% of the rated output of the light source (10) by means of driving dimming of the high pressure gas discharge light source to obtain a first level dimmed light beam;

-varying the actual output of the first level dimming light beam by means of the mechanical dimming structure (40) within a range of 30% -100% of the rated output of the light source (10).