CN201984218U - Holographic optical path system - Google Patents
Holographic optical path system Download PDFInfo
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- CN201984218U CN201984218U CN2011200987570U CN201120098757U CN201984218U CN 201984218 U CN201984218 U CN 201984218U CN 2011200987570 U CN2011200987570 U CN 2011200987570U CN 201120098757 U CN201120098757 U CN 201120098757U CN 201984218 U CN201984218 U CN 201984218U
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- holographic
- hologram
- lens
- light path
- emitting module
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Abstract
The utility model provides a holographic optical path system, which comprises a laser emitting module for supplying the system with a light source, a holographic lens used for performing collimation, wave filtering and deflection to the light emitted by the laser emitting module, and a hologram provided with a sighting and differentiation image, wherein the holographic lens and the laser emitting module are arranged on the same optic axis; the hologram is arranged on the exit optical path of the holographic lens; and a laser diode and an beam expander used for further expanding the divergence angle of the beam emitted by the laser diode are arranged in the laser emitting module. The holographic optical path system is simpler and more compact, has a more flexible mode, and overcomes the problems of the conventional holographic aiming device that the optical path system therein has poor coaxality and rather long structural length of the system.
Description
Technical field
The utility model relates to a kind of holographic light path system, especially a kind of holographic light path system applicable to the laser hologram sighting device.
Background technology
It is a kind of novel tool of taking aim at that application is just moved towards at the twentieth century end that tool is taken aim in holography, it is that holography is used the first time on small arms, once appearance, just caused huge repercussion in the civil and military field with its particular performances, it has been used in the part army of the U.S. and Germany at present.
Holography is taken aim at tool and is utilized the diffraction differentiation virtual image of holographic optical elements (HOE) to aim at, and has that pointing velocity is fast, good concealment and a little advantage affected by environment.Take aim at tool with other and compare, it has openr visual field, can realize the aiming of the full visual field.Can be contained in easily on any firearms, install rapidly reliably, promptly not influence the use of the original mechanical type gunsight of firearms, also not influence and dispose telescope, night vision goggles etc. thereafter.The brightness of aiming differentiation image can be adjusted as required, to adapt to different targets.
The opticator that tool is taken aim in holography is the core of whole device, wherein comprise LASER Light Source, hologram aiming diffraction element and other complementary optical device, the optical element of opticator is few more, the structure of taking aim at tool can do compact and portable more, be that 2 points that tool will be paid close attention to are taken aim in the holography described in the patent of ZL200920218958.2 as the patent No.: 1, take aim at concrete long-pending as far as possible little, weight is light as far as possible; 2, being used to the differentiation image of the hologram that aims at must be clear, and in use to overcome the pointing error that temperature variation is brought, but it independently assembles LD and concavees lens, to bring the big problem of coaxial adjusting difficulty, transmission hologram matched filter and the light path system that concavees lens are formed also exist relative long partially, the defective that the light path system pattern is single relatively of structure simultaneously; And the patent No. is to utilize catoptron to make the folding operation of laser in the patent of ZL200810071050.3, also has the bigger defective of system length.
The utility model content
The purpose of this utility model is to provide that a kind of structure is more succinct, compactness and light path system pattern aim at light path system more flexibly, takes aim at existing light path system alignment difference and the bigger problem of system architecture length in the tool to solve existing holography.
For reaching above-mentioned purpose, the utility model provides a kind of holographic light path system, comprise the laser emitting module that is used to system that light source is provided, be used for that light to laser emitting module emission collimates, the holographic lens of filtering and deviation and have the hologram of aiming differentiation image, its special character is that holographic lens and laser emitting module are on the same optical axis; Hologram is on the emitting light path of holographic lens; The beam expander spare that the angle of divergence of the light beam that is provided with a laser diode in the laser emitting module and is used for this laser diode is sent further enlarges.
Above-mentioned laser diode is the laser diode of the red visible light wave of emission, the laser diode of the visible light wave of transmitting green, the laser diode of emission blue visible light ripple or the laser diode of emission infrared waves.
Above-mentioned beam expander spare is monolithic negative lens, extender lens group or holographic extender lens.
Above-mentioned holographic lens is positioned at the rear or the below of described laser emitting module; The place ahead that described hologram is positioned over this holographic lens on the upper side, and the two parallel placement or approximate parallel placement.
Above-mentioned holographic lens is transmission-type or reflective holographic lens.
Above-mentioned hologram is transmission-type or reflective hologram.
Advantage applies of the present utility model is in the following aspects:
1, because system source directly utilizes a laser emitting module to supply with, so laser beam just can reach enough big beam area in short distance;
2, the beam expander spare in the laser emitting module select for use more flexibly, this beam expander spare can be monolithic negative lens in the traditional optical element or extender lens group, also the holographic extender lens that can make for holographic optics etc.
3, the light wave that sends of the laser diode in the utility model light path system can be taken aim at the red visible light wave of using in the tool for routine, it also can be green visible light wave, can according to circumstances cooperate difference to take aim at the application need of tool, promptly this light path system promptly can be applied to the ruddiness holography and takes aim at tool and also can be used for novel green glow holography and take aim at tool.
4, for guaranteeing the depth of parallelism of holographic lens diffracted beam, the light beam that incides holographic lens must be propagated along the normal direction of lens, light path system of the present utility model adopts laser emitting module directly light beam to be incided on the holographic lens, has avoided light path system to add the accent concentricity problem that other optical element causes before holographic lens.
5, light path system can adopt the reflective holographic lens, utilizes the reflective holographic lens, makes the travel path of light beam collapsiblely in the horizontal direction to carry out, and makes structure more compact, and the holography structure of taking aim at tool can be done more succinctly and weight can be lighter like this.
6, the utility model mutual compensation relationship between the angle of diffraction when coupling between holographic lens and hologram two optical elements is used has carried out detailed elaboration, make that the range of application of system architecture is wider, can select suitable light path system more flexibly for use at different accuracy requirements.
Description of drawings
Light path system synoptic diagram when Fig. 1 is the use of the parallel placement coupling with transmissive hologram of reflective holographic lens.
The light path system synoptic diagram of Fig. 2 when parallel placement is used for reflective holographic lens and reflection hologram mate.
Fig. 3 is that reflective holographic lens and transmissive hologram are mated the light path system synoptic diagram when having certain angle to place use.
Fig. 4 is holographic lens and the incident angle of hologram and the situation of change analysis synoptic diagram of angle of diffraction when the wave length shift of laser beam.
Embodiment
As shown in Figure 1, be provided with in the implementation case: a laser emitting module 1 of forming by laser diode 6 and beam-expanding system 7, be used for that diverging light to laser emitting module 1 emission collimates, the holographic lens 2 of filtering and deviation, this holographic lens 2 is positioned at the rear of laser emitting module 1, and is on the same optical axis with laser emitting module 1; The place ahead that a hologram 3 that has aiming differentiation image, this hologram 3 are positioned over holographic lens 2 on the upper side, and with holographic lens 3 parallel placements or near on the parallel emitting light path that is placed on holographic lens 3.
Wherein be provided with a laser diode 6 in the laser emitting module 1, a beam expander spare 7, this laser diode can also can be for launching the diode of red visible light wave for the diode of the visible light wave of transmitting green, the angle of divergence that this beam expander spare is used for light beam that laser diode is sent further enlarges, this beam expander can be for expanding any beam expander spare of bundle to the light beam that laser diode sends, such as simple monolithic negative lens, extender lens group or holographic extender lens etc., this beam expander spare is made into a module with laser diode, can make the emitted laser bundle is the bigger divergent beams of the angle of divergence, the area of divergent beams just can reach in short distance according to full holographic lens, shortened the length of light path system, thereby make the assembling of light path system more easy, also make the structure simple and stable more of product of this light path system.
By being not difficult to find out among this figure, the central ray of the divergent beams of laser emitting module 1 emission is incident on the holographic lens 2 along the normal direction of holographic lens 2, in the example of this figure, holographic lens 2 will change a branch of directional light of propagating obliquely at a certain angle along the diverging light that normal direction incident is come into, be incident upon on the hologram 3, because the hologram 3 in this example is transmissive hologram that record the differentiation image, so eyes 4 see through hologram 3 is seen the holography differentiation figure on it at the rear of hologram 3 image (virtual image) 5.
Basic identical in the effect of each element shown in accompanying drawing 2 and the accompanying drawing 3 and the attached system shown in Figure 1 just do not done one by one at this and not described in detail.
Angle of diffraction situation of change and compensation relationship between holographic lens and the hologram once set forth during the wave length shift of the laser beam of sending with regard to laser emitting module below.
The angle of diffraction of diffraction optical element can change with the variation of optical maser wavelength, and holographic lens all is a diffraction optical element with the hologram that has aiming differentiation pattern, and they all defer to holographic ultimate principle and diffraction of light law.Because the less stable of common laser diode, its emitted laser wavelength can change with temperature, and wave length shift can cause the angle of diffraction of holographic element to change, and the position of the aiming that diffraction light became of the hologram in hologram aiming differentiation image will produce displacement along with the variation of angle of diffraction.Solve optical maser wavelength and change the follow-up pointing error problem that causes, will make holographic lens and hologram mate use, to eliminate the sight picture displacement that wavelength variations causes.
Light path system with reflective holographic lens and transmissive hologram is an example, and holographic lens and the hologram mutual compensation principle between the angle of diffraction variable quantity when the wavelength variations is carried out following explanation:
As shown in Figure 4, the central light beam of supposing laser emitting module 1 incides on the holographic lens 2 with angle [alpha], when generating laser when in use temperature changes, its wavelength will change thereupon, because holographic lens 2 and hologram 3 all are diffraction optical elements, so the angle of diffraction β of holographic lens 2 also can change along with the drift of wavelength, among the figure, the variable quantity of caused holographic lens 2 angle of diffraction β when Δ β is light wavelength lambda changes delta λ; γ is the incident angle of hologram, the variable quantity of the incident angle of hologram when Δ γ is wavelength variations Δ λ, and θ is the angle of diffraction of hologram, the angle of diffraction variable quantity of hologram when Δ θ is light wavelength lambda changes delta λ.
Because holographic lens 2 and hologram 3 all are diffraction optical element, so its angle of diffraction is all followed holographic ultimate principle and diffraction of light law.According to grating equation, the incident angle and the relation between the angle of diffraction of holographic lens are as follows:
d1(sinα+sinβ)＝λ (1)
α is the incident angle of holographic lens 2 in the formula, and β is the angle of diffraction of holographic lens 2, and d1 is the spacing between 2 liang of interference fringes of holographic lens, i.e. the grating cycle of often saying in the holographic grating.
The angle of diffraction and the relation between the incident angle of same hologram 3 also can be drawn by the diffraction law:
d2(sinγ+sinθ)＝λ (2)
γ is the incident angle of hologram 3 in the formula, and θ is the angle of diffraction of hologram 3, and d2 is the spacing between 3 liang of interference fringes of hologram, promptly is the grating cycle of often saying in the holographic grating.
When the wavelength variable quantity of laser instrument was Δ λ, the angle of diffraction variable quantity of holographic lens 2 was Δ β, and (2) formula can be changed into
d1【sinα+(sin(β+Δβ)】＝λ+Δλ (3)
Equally, when the wavelength variable quantity of laser instrument was Δ λ, the incident angle of light of hologram 3 and diffraction light angle also can change, and its variable quantity is set at Δ γ and Δ θ respectively as shown in the figure, and (3) formula just can be rewritten as like this:
d2【sin(γ+Δγ)+sin(θ+Δθ)】＝λ+Δλ (4)
According to following formula as can be known, the diffraction light that make hologram 3 must make Δ θ=0 not with wavelength variations; Guarantee the precision of hologram aiming, must guarantee the normal direction of the differentiation pattern of hologram 3 at hologram 3, so should make θ=0, (4) formula can be rewritten as like this:
d2(sin(γ+Δγ)＝λ+Δλ (5)
Can be when the wave length shift by (4) and (5) two formulas, the condition that the differentiation image that guarantee hologram 3 remains at the normal direction of hologram 3 is:
d1【sinα+(sin(β+Δβ)】＝d2sin(γ+Δγ)＝λ+Δλ (6)
Because the effect of holographic lens 2 mainly is that the diverging light that generating laser incident is come is converted into directional light, the depth of parallelism of this directional light can directly influence the image space of the differentiation image of hologram 3, if the depth of parallelism is bad, can directly influence pointing accuracy, think the depth of parallelism that guarantees the holographic lens diffraction light, generally can make the normal direction incident of light beam that generating laser sends along holographic lens 2, i.e. α=0, (6) formula can be rewritten as like this:
d1sin(β+Δβ)＝d2sin(γ+Δγ) (7)
By (7) formula as can be known, want to eliminate fully the problem that hologram 3 differentiation images that wavelength variations causes depart from hologram 3 normals, can only make the parameter of holographic lens 2 and hologram 3 satisfy (7) formula, satisfy the simplest mode of (7) formula allow exactly parameter in (7) satisfy below two formulas:
d1＝d2 (8)
β+Δβ＝γ+Δγ (9)
Formula (8) surface, the fringe period of holographic lens 2 and hologram 3 must equate; The angle of diffraction of the surperficial holographic lens 2 of formula (9) and the incident angle of hologram 3 should equate.
Above-mentioned the analysis showed that, want to eliminate fully the problem that differentiation image on the hologram 3 that wavelength variations causes departs from hologram 3 normals, will make holographic lens 2 when making, just have identical spatial frequency with hologram 3, and keeping parallelism is placed and just can be eliminated the influence of wave length shift to the hologram aiming precision fully when using, and light path system as shown in Figure 1 and Figure 2 is exactly to satisfy wherein two kinds of this condition.
Actual when making product, for making structure compact more and pattern is more versatile and flexible, also can partly eliminate the influence of wave length shift to the hologram aiming precision, so just can make holographic lens and hologram have certain included angle, the pointing error that 2 pairs of holograms 3 of holographic lens are caused because of wave length shift is only carried out the part compensation, as long as finally can guarantee that the pointing accuracy of holographic aiming device has been an acceptable by calculating, so this light path system also can be made the pattern of Fig. 3.
Claims (9)
1. holographic light path system, comprise the laser emitting module that is used to system that light source is provided, be used for that light to laser emitting module emission collimates, the holographic lens of filtering and deviation and have the hologram of aiming differentiation image, it is characterized in that: described holographic lens and described laser emitting module are on the same optical axis; Described hologram is on the emitting light path of described holographic lens; The beam expander spare that the angle of divergence of the light beam that is provided with a laser diode in the described laser emitting module and is used for this laser diode is sent further enlarges.
2. holographic light path as claimed in claim 1 system is characterized in that: described laser diode is the laser diode of the red visible light wave of emission, the laser diode of the visible light wave of transmitting green, the laser diode of emission blue visible light ripple or the laser diode of emission infrared waves.
3. holographic light path as claimed in claim 1 or 2 system, it is characterized in that: described beam expander spare is monolithic negative lens or holographic extender lens or extender lens group.
4. holographic light path as claimed in claim 1 or 2 system, it is characterized in that: described holographic lens is positioned at the rear or the below of described laser emitting module; The place ahead that described hologram is positioned over this holographic lens on the upper side, and the two parallel placement or approximate parallel placement.
5. holographic light path as claimed in claim 4 system, it is characterized in that: described holographic lens is transmission-type or reflective holographic lens.
6. holographic light path as claimed in claim 5 system, it is characterized in that: described hologram is transmission-type or reflective hologram.
7. holographic light path as claimed in claim 3 system, it is characterized in that: described holographic lens is positioned at the rear or the below of described laser emitting module; The place ahead that described hologram is positioned over this holographic lens on the upper side, and the two parallel placement or approximate parallel placement.
8. holographic light path as claimed in claim 7 system, it is characterized in that: described holographic lens is transmission-type or reflective holographic lens.
9. holographic light path as claimed in claim 8 system, it is characterized in that: described hologram is transmission-type or reflection hologram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200987570U CN201984218U (en) | 2011-04-06 | 2011-04-06 | Holographic optical path system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200987570U CN201984218U (en) | 2011-04-06 | 2011-04-06 | Holographic optical path system |
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| CN201984218U true CN201984218U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200987570U Expired - Lifetime CN201984218U (en) | 2011-04-06 | 2011-04-06 | Holographic optical path system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141678A (en) * | 2011-04-06 | 2011-08-03 | 西安华科光电有限公司 | Holographic light path system |
| CN102520512A (en) * | 2012-01-14 | 2012-06-27 | 西安华科光电有限公司 | Holographic optical path |
| US10775689B2 (en) | 2017-06-21 | 2020-09-15 | Coretronic Corporation | Illumination system and projection apparatus |
-
2011
- 2011-04-06 CN CN2011200987570U patent/CN201984218U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141678A (en) * | 2011-04-06 | 2011-08-03 | 西安华科光电有限公司 | Holographic light path system |
| CN102520512A (en) * | 2012-01-14 | 2012-06-27 | 西安华科光电有限公司 | Holographic optical path |
| US10775689B2 (en) | 2017-06-21 | 2020-09-15 | Coretronic Corporation | Illumination system and projection apparatus |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110921 |
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| CX01 | Expiry of patent term |