CN113219770A - Optical machine module and projection equipment - Google Patents

Optical machine module and projection equipment Download PDF

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Publication number
CN113219770A
CN113219770A CN202110567684.3A CN202110567684A CN113219770A CN 113219770 A CN113219770 A CN 113219770A CN 202110567684 A CN202110567684 A CN 202110567684A CN 113219770 A CN113219770 A CN 113219770A
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China
Prior art keywords
prism
assembly
light
light beam
prism assembly
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CN202110567684.3A
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Chinese (zh)
Inventor
王宇
阴亮
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Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
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Priority to CN202110567684.3A priority Critical patent/CN113219770A/en
Publication of CN113219770A publication Critical patent/CN113219770A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3152—Modulator illumination systems for shaping the light beam

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

The application discloses ray apparatus module and projection equipment belongs to projection technical field. The optical-mechanical module comprises a light valve, a prism device and a lens component which are arranged along a light path in sequence; the prism device includes: the prism assembly is arranged on the driving component, the prism assembly is used for guiding the received light beams to the light valve through total reflection, the light valve is used for guiding the received light beams to the prism assembly, the prism assembly is used for guiding the light beams provided by the light valve to the lens assembly, and the lens assembly is used for projecting an image picture based on the projection; the driving part is used for driving the prism assembly to vibrate, so that the vibrating mirror can be omitted, the structure of the optical machine module is simple, the problems that the optical machine module is complex in structure, the assemblies are more and the size of the projection equipment is large in the related technology can be solved, and the effects of simplifying the optical machine module structure and reducing the size of the optical machine module are achieved.

Description

Optical machine module and projection equipment
Technical Field
The application relates to the technical field of projection, in particular to an optical machine module and projection equipment.
Background
The laser projection technology is a new projection display technology, and the main advantages of the laser light source include high brightness, bright color and low energy consumption, so that the laser projection technology has the characteristics of high picture contrast and clear imaging, and therefore, the laser projection technology becomes the mainstream development direction in the market. With the development of projection display technology and markets, in order to enable laser display projection technology to be applied to more scenes, a miniaturized projection apparatus is required. The structure of the optical-mechanical module in the projection equipment has a large influence on the volume of the projection equipment.
An optical-mechanical module is used for projection equipment and comprises a Digital micro-mirror Device (DMD), a prism assembly, a galvanometer assembly and a lens assembly, wherein light beams emitted by the DMD assembly are guided to the prism assembly, the prism assembly receives the light beams and emits the light beams to the galvanometer assembly, and the galvanometer assembly deflects the light beams and then emits the light beams to the lens assembly. When the optical-mechanical module is used, the information carried on the outgoing light beam of the DMD can generate pixel deviation at the galvanometer component and is superposed at the lens component, so that higher resolution is achieved.
However, the optical mechanical module has a complex structure, many components and a large volume.
Disclosure of Invention
The embodiment of the application provides an optical machine module and projection equipment. The technical scheme is as follows:
according to a first aspect of the application, a ray apparatus module is provided, the ray apparatus module includes: a light valve, a prism device and a lens component which are arranged along the light path in sequence;
the prism device includes: the prism assembly is arranged on the driving component, the prism assembly is used for guiding received light beams to the light valve through total reflection, the light valve is used for guiding the received light beams to the prism assembly, the prism assembly is used for guiding the received light beams to the lens assembly, the lens assembly is used for projecting image pictures based on the received light beams, and the driving component is used for driving the prism assembly to vibrate.
Optionally, the prism assembly comprises a first triangular prism comprising a first face, a second face and a third face connected end to end, the first face of the first triangular prism being adapted to receive and direct a light beam towards the second face;
when the prism assembly is in use, the incidence angle of the principal ray of the light beam incident from the first surface on the second surface is larger than the critical angle of total reflection, so that the light beam incident from the first surface is reflected to the third surface by the second surface, the third surface is used for guiding the light beam to the light valve and guiding the light beam emitted from the light valve to the second surface, and the second surface is used for guiding the light beam incident from the third surface to the second triangular prism.
Optionally, the first triangular prism satisfies:
Figure BDA0003081487500000021
the m is an incident angle of a principal ray incident from the first surface on the second surface, the z is an incident angle of the first received light beam, the a is an included angle between the first surface and the second surface, the n is a refractive index of the first prism, and the θ is a maximum deflection angle of the prism assembly when the prism assembly vibrates along the first axis.
Optionally, the driving component is configured to drive the prism assembly to vibrate with a first axis as an axis, where the first axis is perpendicular to the first surface and the second surface and passes through a first point, and the first point is an intersection point of an optical axis of the light valve and the third surface.
Optionally, the optical mechanical module further includes a light homogenizing assembly and a light path assembly, the light homogenizing assembly is configured to receive a light beam and guide the processed light beam to the light path assembly, the light path assembly is configured to guide the received light beam to the prism assembly, and the prism assembly is further configured to guide the received light beam from the light path assembly to the light valve.
Optionally, the driving component is configured to drive the prism assembly to vibrate about a second axis, which is perpendicular to the first axis.
In another aspect, there is provided a prism apparatus including: the prism assembly is arranged on the driving component, the prism assembly is used for guiding received light beams to the light valve through total reflection, the light valve is used for guiding the received light beams to the prism assembly, the prism assembly is used for guiding the received light beams to the lens assembly, the lens assembly is used for projecting image pictures based on the received light beams, and the driving component is used for driving the prism assembly to vibrate.
Optionally, the prism assembly comprises a first triangular prism comprising a first face, a second face and a third face connected in series, the first face of the first triangular prism being configured to receive and direct a light beam towards the second face;
when the prism assembly vibrates, the incidence angle of the principal ray of the light beam incident from the first surface on the second surface is larger than the total reflection critical angle, so that the second surface reflects the light beam incident from the first surface to the third surface, the third surface is used for guiding the light beam to the light valve and receiving the light beam emitted by the light valve to be guided to the second surface, and the second surface is used for guiding the light beam incident from the third surface to the second triangular prism.
Optionally, the driving component is configured to drive the prism assembly to vibrate with a first axis as an axis, where the first axis is perpendicular to the first surface and the second surface and passes through a first point, and the first point is an intersection point of an optical axis of the light valve and the third surface.
In another aspect, a projection apparatus is provided, where the projection apparatus includes any of the optical mechanical modules described above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
an opto-mechanical module is provided that includes a light valve, a prism device, and a lens assembly, wherein the prism device includes a prism assembly and a drive component. The prism assembly is used for guiding the received light beams to the light valve through total reflection, the driving part can drive the prism assembly to vibrate at high frequency, light emitted from the light valve to the prism assembly can be emitted to the lens assembly along different light paths at different moments respectively, and emitted to the projection screen by the lens assembly, the light beams at different moments can be superposed on the projection screen, so that a vibrating mirror can be omitted, the structure of the optical-mechanical module is simpler, the problems that the optical-mechanical module is complex in structure, the assemblies are more and the size is possibly larger in the related technology can be solved, and the effects of simplifying the optical-mechanical module structure and reducing the size of the optical-mechanical module are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of an implementation environment provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of an opto-mechanical module according to the related art;
fig. 3 is a schematic structural diagram of an optical-mechanical module according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an optical path of a prism provided in an embodiment of the present application;
FIG. 5 is a schematic view of a deflection of a prism assembly according to an embodiment of the present application;
fig. 6 is a schematic view of a picture projected by the optical-mechanical module according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another optical-mechanical module according to an embodiment of the present disclosure;
fig. 8 is a schematic view of another image projected by the optical-mechanical module according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of a prism device according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an implementation environment according to an embodiment of the present disclosure, which may include a projection device 10 and a projection curtain 20.
The projection apparatus 10 may include an optical module 11 and a light source device 12. The light source device 12 is used for providing a light source to the optical module 11, and the optical module 11 is used for projecting a predetermined pattern onto the projection curtain 20 according to the light source provided by the light source device 12.
The projection curtain 20 is used for carrying the pattern projected by the optical module 11. The projection screen 20 may be made of various materials, such as Polyvinyl chloride (PVC), metal, glass fiber, glass beads, etc., and the present embodiment is not limited thereto.
Fig. 2 is a schematic structural diagram of an optical-mechanical module in the related art. The optical-mechanical module 30 includes a Digital Micromirror Device (DMD)31, a prism assembly 32, a galvanometer assembly 33, and a lens assembly 34 sequentially arranged along a light path direction, wherein the lens assembly 34 includes a lens 341 and a lens 342. When the light beam is emitted from the dmd 31 to the prism assembly 32, the prism assembly 32 receives the light beam and emits the light beam to the galvanometer assembly 33, the galvanometer assembly 33 deflects the light beam and then emits the light beam to the lens 341, and the light beam is emitted from the lens 341 and then enters the lens 342. When the optical-mechanical module operates, the vibrating mirror assembly 33 can vibrate, so that light beams emitted by the digital micro-mirror device 31 can respectively emit to the lens assembly 34 from different light paths at different moments after reaching the vibrating mirror assembly 33, and emit to the projection screen by the lens assembly 34, and the light beams at different moments can be superposed on the projection screen to improve the resolution of images displayed on the projection screen.
In one technical scheme, a galvanometer component is arranged in an optical mechanical module, the galvanometer component can be arranged between a prism component and a lens component, when a light beam is emitted from a digital micro-mirror device and then penetrates through protective glass to the prism component, the prism component receives the light beam and emits the light beam to the galvanometer component, the galvanometer component comprises a galvanometer structural part and a galvanometer, the galvanometer structural part provides power for the galvanometer so that the galvanometer can deflect to enable the light beam to deviate, then the light beam is respectively emitted to the lens component along different light paths at different moments through the lens component so as to improve the resolution of projection equipment formed by the optical mechanical module, a structure formed by the galvanometer structural part and the galvanometer has a certain volume, when the structure is arranged between the lens component and the prism component, in order to avoid the structure from influencing the prism component and the lens component, a certain distance needs to be reserved between the structure and the lens component as well as the prism component, as shown in fig. 2, the distance between the prism assembly 33 and the galvanometer assembly 34 may be 4 mm, the distance between the galvanometer assembly 34 and the lens assembly 35 may be 3 mm, the thickness of the galvanometer optical glass may be about 2 mm, and the distance a between the prism assembly 33 and the lens assembly 35 ranges from 9 mm to 17 mm, which makes the distance between the prism assembly 33 and the lens assembly 35 larger, and further causes the volume of the optical module to be larger.
In another technical scheme, a vibrating mirror assembly in the optical-mechanical module can be placed between the prism assembly and the digital micro-mirror device, the vibrating mirror assembly comprises a vibrating mirror structural part and a vibrating mirror, the vibrating mirror structural part provides power for the vibrating mirror, and the vibrating mirror deflects to enable a light beam to deviate, so that the resolution of projection equipment formed by the optical-mechanical module is improved. The structure that the mirror structure and the mirror that shakes constitute has certain volume, and when setting up this structure between digital micro mirror device and prism subassembly, in order to avoid this structure and prism subassembly and digital micro mirror device to influence each other, all need reserve certain distance between this structure and digital micro mirror device and the prism subassembly, this distance that just makes between digital micro mirror device and the prism subassembly is great, and then leads to the volume of ray apparatus module great.
Above-mentioned ray apparatus module has set up the mirror subassembly that shakes, can make ray apparatus module structure complicated under the normal conditions, and projection equipment's the great thickness of volume is thicker. In addition, in the projection apparatus, the difficulty of designing the optical path and the lens is also high.
The embodiment of the application provides an optical machine module and projection equipment, and can solve the problems in the related art.
Fig. 3 is a schematic structural diagram of an optical-mechanical module according to an embodiment of the present disclosure. The structure of the optical-mechanical module is as follows:
the optical-mechanical module 11 includes a light valve 111, a prism device 112 and a lens assembly 113 sequentially disposed along an optical path.
The prism device 112 includes: the prism assembly 1121 is mounted on the driving component 1122, the prism assembly 1121 is configured to guide a received light beam to the light valve 111 through total reflection, the light valve 111 is configured to guide the received light beam to the prism assembly 1121, the prism assembly 1121 is configured to guide the received light beam to the lens assembly 113, the lens assembly 113 is configured to project an image picture based on the received light beam, and the driving component 1122 is configured to drive the prism assembly 1121 to vibrate so as to increase the resolution of the image picture projected by the lens assembly 113.
In summary, the embodiment of the present application provides an optical mechanical module including a light valve, a prism device and a lens assembly, wherein the prism device includes a prism assembly and a driving component. The prism assembly is used for guiding the received light beams to the light valve through total reflection, the driving part can drive the prism assembly to vibrate at high frequency, light emitted from the light valve to the prism assembly can be emitted to the lens assembly along different light paths at different moments respectively, and emitted to the projection screen by the lens assembly, the light beams at different moments can be superposed on the projection screen, so that the resolution ratio of an image picture projected by the lens assembly is increased, so that a vibrating mirror can be omitted, the structure of the optical machine module is simpler, the problems that the optical machine module is complex in structure, more in assembly and larger in size in the related technology can be solved, and the effects of simplifying the optical machine module structure and reducing the size of the optical machine module are achieved.
As shown in fig. 4, the prism assembly 1121 includes a first triangular prism 11211 and a second triangular prism 11212, the first triangular prism 11211 includes a first face 01, a second face 02, and a third face 03 connected end to end, and the first face 01 of the first triangular prism 11211 is configured to receive a light beam and direct the light beam to the second face 02.
Optionally, the first triangular prism 11211 and the second triangular prism 11212 are glued, an air gap exists between the two prisms, and the distance ranges from 0.003 mm to 0.005 mm.
The driving member 1122 is configured to drive the prism assembly 1121 to vibrate about a first axis n (which is perpendicular to the paper surface) perpendicular to the first surface 01 and the second surface 02 and passing through a first point, which is an intersection point of the optical axis of the light valve 111 and the third surface 03. The prism assembly 1121 can perform high-frequency vibration by being driven by the driving member 1122, thereby realizing offset projection of light beams.
When the prism assembly 1121 is vibrated, an incident angle of a chief ray (the chief ray may refer to a ray passing through the center of an optical module diaphragm) of a light beam incident from the first surface 01 on the second surface 02 is greater than a total reflection critical angle, so that the second surface 02 reflects the light beam incident from the first surface 01 toward the third surface 03, the third surface 03 is used for guiding the light beam to the light valve 111 and guiding the light beam emitted from the light valve 111 to the second surface 02, and the second surface 02 is used for guiding the light beam incident from the third surface 03 to the second prism 11212.
Wherein the first triangular prism 11211 satisfies:
Figure BDA0003081487500000061
where m is an incident angle of a principal ray incident on the first surface 01 at the second surface 02, a is an incident angle of a light beam received by the first surface 01, z is an included angle between the first surface 01 and the second surface 02, n is a refractive index of the first triangular prism 11211, and θ is a maximum deflection angle when the prism assembly 1121 vibrates along the first axis.
In the optical module of the present application, the prism assembly 1121 and the driving component 1122 are utilized to enable the resolution of the light beam emitted from the optical module to be higher than the resolution of the light valve 111, for example, the resolution can be increased from 1080P in the related art to 4K. As shown in fig. 5, the prism assembly 1121 is illustrated as an equivalent prism assembly. When the driving member 1122 drives the prism assembly 1121 to perform high-frequency vibration, the prism assembly 1121 is in the first state (a), and when the prism assembly 1121 is displaced by a certain angle with respect to the first state, the prism assembly 1121 is in the second state (b). As shown in fig. 5(a), when the prism assembly 1121 is in the first state (a), the main light of the light beam emitted from the light valve 111 can be guided to the prism assembly 1121 and emitted perpendicularly to the prism assembly 1121, and the main light beam is not shifted. To achieve the effect of pixel shift, as shown in fig. 5(b), when the prism assembly 1121 is in the second state (b), the driving component 1122 drives the prism assembly 1121 to vibrate to form a deflection angle θ, and after a principal ray passes through the prism assembly 1121, a shift Δ y is generated, and it is known that the refractive index of the prism assembly 1121 is n, the thickness is t, according to the law of refraction:
sinθ＝n sinθ1；
and trigonometric functions:
Figure BDA0003081487500000071
it can be deduced that:
Figure BDA0003081487500000072
using the trigonometric function formula:
sin(θ-θ1)＝sinθcosθ1-cosθsinθ1；
sin2θ+cos2θ＝1；
and the law of refraction can be derived:
Figure BDA0003081487500000073
the driving component 1122 drives the prism assembly 1121 to perform deflection vibration to realize pixel displacement, so that the resolution of the image presented on the projection curtain can be improved. The offset of the prism assembly 1121, which is driven by the driving component 1122 to vibrate, to the light beam is 1/2 pixel pitches, the driving component 1122 can drive the prism assembly 1121 to perform high-frequency vibration in a cyclic reciprocating manner along a third axis (the third axis is an axis coinciding with a diagonal direction of the pixel), when the prism assembly 1121 performs high-frequency vibration along the third axis, the light beam guided out of the prism assembly 1121 forms pixel offset, as shown in fig. 6, which is a schematic diagram of a picture projected by the optical mechanical module provided in the embodiment of the present application. P1 is the initial pixel position, and P2 is the position of the initial pixel after the initial pixel is shifted along the third axis, so that the resolution of the image projected by the lens assembly 113 can be increased.
Fig. 7 is a schematic structural diagram of another optical-mechanical module according to an embodiment of the present disclosure. The structure of the optical-mechanical module is as follows:
the optical mechanical module further includes a light homogenizing assembly 114 and an optical path assembly 115, the light homogenizing assembly 114 is configured to receive a light beam from the light source, optimize a spot shape of a light spot of the incident light beam, homogenize the light beam, and process the light beam to the optical path assembly 115, the optical path assembly 115 includes a first lens 1151, a mirror 1152, and a second lens 1153, the first lens 1151 receives the light beam from the light homogenizing assembly 114 and transmits the light beam to the mirror 1152, the mirror 1152 is configured to reflect the light beam transmitted through the first lens 1151 to the second lens 1153, the second lens 1153 is configured to direct the light beam reflected by the mirror 1152 to the prism device 112, the prism device 112 is further configured to direct the light beam received from the optical path assembly 115 to the light valve 111, and then, the light valve 111 is configured to process the received light beam (i.e., process the light beam) to the prism device 112, the prism device 112 is configured to direct the light beam provided by the light valve 111 to the light valve 113, the lens assembly 113 is used for projecting an image picture based on the received light beam.
Optionally, a piece of protective glass may be disposed between the light valve 111 and the prism device 112 in the optical-mechanical module, and the protective glass is a piece of common transparent glass.
Alternatively, the projection device may include a projection device of a laser light source and a projection device of an LED light source. The projection equipment of LED light source can reach the volume miniaturization, but the projection equipment's of LED light source resolution ratio is mostly 720P, and laser source's projection equipment can improve resolution ratio and display brightness, thereby make projection equipment's picture contrast better, it is more clear to form images, bright in color, luminance is higher, even light subassembly can be used for carrying out the homogenization with the light of the gaussian distribution that the light source provided, the shape that matches digital micro mirror device is put into shape to beam shaping simultaneously, consequently in the ray apparatus module, set up even light subassembly 114 and receive laser beam, before making laser beam get into light path subassembly 115 after through even light subassembly 114, can carry out light beam homogenization and facula optimization earlier.
Optionally, the light homogenizing assembly may be a light guide tube or a fly-eye lens, and may be used to shape and homogenize the laser spot incident from the light source. Beam homogenization refers to the shaping of a beam with uneven intensity distribution into a beam with uniform cross-section distribution through beam transformation. Laser speckle refers to the fact that when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission of light, the light beams form bright or dark spots, creating a random granular intensity pattern.
The light guide pipe is a tubular device formed by splicing four plane reflection sheets, namely a hollow light guide pipe, light rays are reflected for multiple times in the light guide pipe to achieve the effect of light uniformization, the light guide pipe can also adopt a solid light guide pipe, the light inlet and the light outlet of the light guide pipe are rectangles with uniform shapes and areas, light beams enter from the light inlet of the light guide pipe and then are emitted from the light outlet of the light guide pipe, and light beam homogenization and laser spot optimization are completed in the process of passing through the light guide pipe. Fly-eye lenses are generally formed by combining a series of small lenses, two arrays of fly-eye lenses are arranged in parallel to divide the light spot of an input laser beam, and the divided light spots are accumulated by a subsequent focusing lens, so that the light beam is homogenized and the light spot is optimized.
Optionally, the distance b between the prism device 112 and the lens assembly 113 ranges from 4 mm to 12 mm. When a galvanometer component exists between the prism device and the lens component, the distance a between the prism component and the lens component ranges from 9 millimeters to 17 millimeters, wherein the distance between the prism device and the galvanometer component can be 4 millimeters, the distance between the galvanometer component and the lens component head can be 3 millimeters, and the thickness of the galvanometer optical glass can be about 2 millimeters. In the ray apparatus module that this application embodiment provided, replace the mirror assembly that shakes through the prism device, the mirror thickness that shakes and the distance between mirror assembly to the camera lens subassembly and the mirror assembly that shakes to the prism device have been subtracted in other words, the distance between prism device to the camera lens subassembly has reduced 5 millimeters at least, the scope becomes 4 millimeters ~ 12 millimeters, the distance of prism assembly to camera lens subassembly has been shortened effectively, and the structure of ray apparatus module has been simplified, be favorable to miniaturized projection equipment.
Optionally, in another technical solution provided in this embodiment of the present application, the driving component 1122 is configured to drive the prism assembly 1121 assembly to perform a cyclic reciprocating vibration about a first axis and a second axis, where the second axis is perpendicular to the first axis. The two vibration axes are not parallel to each other, so that the pixels can be deviated in two different directions and are crossed with each other, and the resolution of the picture projected on the projection curtain can be further improved.
The amount of displacement of the prism assembly 1121 from the light beam is 1/2 pixel pitches, when the driving member 1122 drives the prism assembly 1121 to perform cyclic reciprocating vibration along an axis, the light beam is displaced by 1/2 pixel pitches perpendicular to the axis, and when the driving member 1122 drives the prism assembly 1121 along the number of axes performing cyclic reciprocating high-frequency vibration, the pixel resolution of the light beam is improved more. When the driving component 1122 drives the prism assembly 1121 to perform high-frequency vibration in a cyclic reciprocating manner along the first axis and the second axis, and the first axis and the second axis are perpendicular to each other, pixels on the light beam are shifted to the right and to the bottom, as shown in fig. 8, which is a schematic diagram of another picture projected by the optical mechanical module provided in the embodiment of the present application. P1 is the initial pixel position, and P2 is the position of the initial pixel after vibration deflection along the horizontal axis and the axis perpendicular to the horizontal axis, so as to improve the resolution of the picture by 4 times of the original resolution, greatly improve the resolution of the picture, and improve the display effect.
In summary, the embodiment of the present application provides an optical mechanical module including a light valve, a prism device and a lens assembly, wherein the prism device includes a prism assembly and a driving component. The prism assembly is used for guiding the received light beams to the light valve through total reflection, the driving part can drive the prism assembly to vibrate at high frequency, light emitted from the light valve to the prism assembly can be emitted to the lens assembly along different light paths at different moments respectively, and emitted to the projection screen by the lens assembly, the light beams at different moments can be superposed on the projection screen, so that the resolution ratio of an image picture projected by the lens assembly is increased, so that a vibrating mirror can be omitted, the structure of the optical machine module is simpler, the problems that the optical machine module is complex in structure, more in assembly and larger in size in the related technology can be solved, and the effects of simplifying the optical machine module structure and reducing the size of the optical machine module are achieved.
Fig. 9 is a schematic structural diagram of a prism device according to an embodiment of the present disclosure. The prism device 112 includes: the prism assembly 1121 is mounted on the driving component 1122, the prism assembly 1121 is used for guiding a received light beam to the light valve 111 through total reflection, the light valve 111 is used for guiding the received light beam to the prism assembly 1121, the prism assembly 1121 is used for guiding the received light beam to the lens assembly 113, and the lens assembly 113 is used for projecting an image picture based on the received light beam;
the driving component 1122 is configured to drive the prism assembly 1121 to vibrate so as to increase the resolution of the image projected by the lens assembly 113.
Wherein the prism assembly 1121 includes a first triangular prism 11211 and a second triangular prism 11212, the first triangular prism 11211 includes a first face 01, a second face 02, and a third face 03 connected end to end, and the first face 01 of the first triangular prism 11211 is configured to receive a light beam and direct the light beam to the second face 02.
Optionally, the first triangular prism 11211 and the second triangular prism 11212 are glued, an air gap exists between the two prisms, and the distance ranges from 0.003 mm to 0.005 mm.
The driving member 1122 is configured to drive the prism assembly 1121 to vibrate about a first axis n (which is perpendicular to the paper surface) perpendicular to the first surface 01 and the second surface 02 and passing through a first point, which is an intersection point of the optical axis of the light valve 111 and the third surface 03. The prism assembly 1121 can perform high-frequency vibration by being driven by the driving member 1122, thereby realizing offset projection of light beams.
When the prism assembly 1121 is vibrated, an incident angle of a chief ray (the chief ray may refer to a ray passing through the center of an optical module diaphragm) of a light beam incident from the first surface 01 on the second surface 02 is greater than a total reflection critical angle, so that the second surface 02 reflects the light beam incident from the first surface 01 toward the third surface 03, the third surface 03 is used for guiding the light beam to the light valve 111 and guiding the light beam emitted from the light valve 111 to the second surface 02, and the second surface 02 is used for guiding the light beam incident from the third surface 03 to the second prism 11212.
Wherein the first triangular prism 11211 satisfies:
Figure BDA0003081487500000101
where m is an incident angle of a principal ray incident on the first surface 01 at the second surface 02, a is an incident angle of a light beam received by the first surface 01, z is an included angle between the first surface 01 and the second surface 02, n is a refractive index of the first triangular prism 11211, and θ is a maximum deflection angle when the prism assembly 1121 vibrates along the first axis.
Optionally, the drive component 1122 is used to drive the prism assembly 1121 to vibrate at a frequency greater than or equal to 30 hz.
The prism assembly 1121 was offset by half a pixel from the beam, for example, by 0.47DMD (DMD having a size of 0.47 inches), which was 2.7 μm. Since the size of the 0.47DMD is much larger than the offset of the light beam after the driving component 1122 drives the prism assembly 1121 to vibrate, the offset of the light beam does not affect the adjustment of the dark band. In the embodiment of the present application, the vibration frequency of the prism assembly 1121 is 30Hz, which is greater than the frequency at which the human eye can start to perceive the image frame, and may be 60 Hz.
In summary, the embodiment of the present application provides an optical mechanical module including a light valve, a prism device and a lens assembly, wherein the prism device includes a prism assembly and a driving component. The prism assembly is used for guiding the received light beams to the light valve through total reflection, the driving part can drive the prism assembly to vibrate at high frequency, light emitted from the light valve to the prism assembly can be emitted to the lens assembly along different light paths at different moments respectively, and emitted to the projection screen by the lens assembly, the light beams at different moments can be superposed on the projection screen, so that the resolution ratio of an image picture projected by the lens assembly is increased, so that a vibrating mirror can be omitted, the structure of the optical machine module is simpler, the problems that the optical machine module is complex in structure, more in assembly and larger in size in the related technology can be solved, and the effects of simplifying the optical machine module structure and reducing the size of the optical machine module are achieved.
Fig. 10 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. The projection apparatus 10 includes a light source device 12 and the optical-mechanical module 11 in any of the above embodiments.
The light source device 12 may include at least one laser and a light beam control component for providing light beams of various colors to the optical mechanical module 11.
The dodging component 114 is used for receiving light beams from a light source, optimizing the shape of light spots of the incident light beams, homogenizing the light beams, processing the light beams and guiding the processed light beams to the light path component 115, the light path component 115 is used for guiding the received light beams to the prism device 112, the prism device 112 is used for guiding the received light beams to the light valve 111 through total reflection, then the light valve 111 is used for processing the received light beams and guiding the processed light beams to the prism device 112, the prism device 112 is also used for guiding the light beams provided by the light valve 111 to the lens component 113, and the lens component 113 is used for projecting image pictures based on the received light beams.
In addition, the projection apparatus 10 in the embodiment of the present application includes the prism assembly 1121 capable of vibrating under the driving of the driving member 1122, and the prism assembly 1121 can improve the resolution of the picture projected by the projection lens, for example, if the resolution of the light valve is 1080p, the resolution of the picture projected by the projection lens can reach 4K through the prism assembly 1121 capable of vibrating under the driving of the driving member 1122. And light valve and projection lens are close to the prism subassembly, have reduced the whole length of ray apparatus module along the optical axis direction, and back working distance reduces simultaneously and can make projection lens's size reduce relatively, and the camera lens design degree of difficulty descends, and the camera lens reduces the lens complexity to obtain projection equipment 10 that the volume is littleer.
Therefore, the projection device 10 including the optical engine module 11 provided in the embodiment of the present application can reduce the distance in both the F1 direction and the F2 direction of the projection device, thereby reducing the volume of the projection device, and achieving a higher resolution.
In summary, the embodiments of the present application provide a projection apparatus including a light source device and an optical-mechanical module, the optical-mechanical module includes an optical-mechanical module, a prism device and a lens assembly, wherein the prism device comprises a prism component and a driving component, the driving component can drive the prism component to vibrate at high frequency, the emergent light of the light valve can respectively emit to the lens component along different light paths at different moments, and the light beams at different moments can be superposed on the projection screen, so as to increase the resolution of the image projected by the lens assembly, thus eliminating the need for a vibrating mirror, and the optical-mechanical module has a simpler structure, and can solve the problems of complicated structure and more components of the optical-mechanical module in the related art, and then lead to the great problem of projection equipment volume, reached and simplified the ray apparatus module structure, and then reduced the effect of projection equipment volume.
After the size of the projection equipment is reduced, the projection equipment can be applied to more scenes, the application field of the projection equipment is expanded, and the user experience is better.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
It should be noted that the terms "first," "second," and "third" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Claims (10)

1. An optical-mechanical module is characterized by comprising a light valve, a prism device and a lens component which are sequentially arranged along an optical path;
the prism device includes: the prism assembly is arranged on the driving component, the prism assembly is used for guiding received light beams to the light valve through total reflection, the light valve is used for guiding the received light beams to the prism assembly, the prism assembly is used for guiding the received light beams to the lens assembly, the lens assembly is used for projecting image pictures based on the received light beams, and the driving component is used for driving the prism assembly to vibrate.
2. The prism assembly of claim 1 wherein the prism assembly comprises a first triangular prism and a second triangular prism, the first triangular prism comprising a first face, a second face, and a third face connected end to end, the first face of the first triangular prism configured to receive and direct a light beam toward the second face;
when the prism assembly vibrates, the incidence angle of the principal ray of the light beam incident from the first surface on the second surface is larger than the total reflection critical angle, so that the second surface reflects the light beam incident from the first surface to the third surface, the third surface is used for guiding the light beam to the light valve and guiding the light beam emitted from the light valve to the second surface, and the second surface is used for guiding the light beam incident from the third surface to the second triangular prism.
3. The prism device according to claim 2, wherein the first triangular prism satisfies:
Figure FDA0003081487490000011
the m is an incident angle of a principal ray incident from the first surface on the second surface, a is an incident angle of a light beam received by the first surface, z is an included angle between the first surface and the second surface, n is a refractive index of the first prism, and θ is a maximum deflection angle of the prism assembly when the prism assembly vibrates along the first axis.
4. The prism device according to claim 2, wherein the driving member is configured to drive the prism assembly to vibrate about a first axis, the first axis being perpendicular to the first surface and the second surface and passing through a first point, the first point being an intersection point of the optical axis of the light valve and the third surface.
5. The opto-mechanical module of any of claims 1-4 further comprising a dodging assembly for receiving and processing the light beam and directing the processed light beam to the optical path assembly, and an optical path assembly for directing the received light beam to the prism assembly, the prism assembly further being configured to direct the light beam received from the optical path assembly to the light valve.
6. The opto-mechanical module of any of claims 1-4 wherein the drive assembly is configured to drive the prism assembly to oscillate about a second axis that is perpendicular to the first axis.
7. A prism assembly, comprising: the prism assembly is arranged on the driving component, the prism assembly is used for guiding received light beams to the light valve through total reflection, the light valve is used for guiding the received light beams to the prism assembly, the prism assembly is used for guiding the received light beams to the lens assembly, the lens assembly is used for projecting image pictures based on the received light beams, and the driving component is used for driving the prism assembly to vibrate.
8. The prism assembly of claim 7 wherein the prism assembly comprises a first triangular prism and a second triangular prism, the first triangular prism comprising a first face, a second face, and a third face connected in series, the first face of the first triangular prism configured to receive and direct a light beam toward the second face;
when the prism assembly vibrates, the incidence angle of the principal ray of the light beam incident from the first surface on the second surface is larger than the total reflection critical angle, so that the second surface reflects the light beam incident from the first surface to the third surface, the third surface is used for guiding the light beam to the light valve and receiving the light beam emitted by the light valve to be guided to the second surface, and the second surface is used for guiding the light beam incident from the third surface to the second triangular prism.
9. The prism device according to claim 7, wherein the driving member is configured to drive the prism assembly to vibrate about a first axis, the first axis being perpendicular to the first surface and the second surface and passing through a first point, the first point being an intersection point of the optical axis of the light valve and the third surface.
10. A projection apparatus, comprising the opto-mechanical module of any of claims 1-6.
CN202110567684.3A 2021-05-24 2021-05-24 Optical machine module and projection equipment Pending CN113219770A (en)

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CN202110567684.3A CN113219770A (en) 2021-05-24 2021-05-24 Optical machine module and projection equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110567684.3A CN113219770A (en) 2021-05-24 2021-05-24 Optical machine module and projection equipment

Publications (1)

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CN113219770A true CN113219770A (en) 2021-08-06

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