CN117826514A - Optical machine and projector - Google Patents

Abstract

The present disclosure relates to an optical bench, comprising: the light source module is used for emitting light source light; the zooming module is arranged on one side of the light source module and is used for zooming the light source light and then emitting the zoomed light; the zooming module is also used for changing the zooming multiple of the light source light; the light guide module is arranged on one side of the zooming module, which is far away from the light source module, and is used for receiving and guiding the light source light; the modulation module is used for receiving the light source light transmitted by the light guide module and modulating the light source light into image light; and the lens module is used for receiving the image light and projecting the image light out. The optical machine is beneficial to zooming light source light, so that different lenses are adapted. The present disclosure also relates to a projector.

Description

Optical machine and projector

Technical Field

The disclosure relates to the technical field of laser projection, and in particular relates to a light machine and a projector comprising the light machine.

Background

In a common laser projector, laser is generally guided to a light modulation module, and modulated image light is emitted through a lens. However, when the laser is guided to the light modulation module, the zoom factor of the laser is usually set to match the F number of the lens, and when the lens is replaced or the zoom lens is used, the zoom factor of the laser is not matched with the F number of the lens, so that light energy is lost, and light efficiency is reduced.

Disclosure of Invention

The disclosure discloses an optical machine and a projector, which can maintain high light efficiency when matching lenses with different F numbers.

In a first aspect, the present disclosure relates to an optical bench comprising:

the light source module is used for emitting light source light;

the zooming module is arranged on one side of the light source module and is used for zooming the light source light and then emitting the zoomed light; the zooming module is also used for changing the zooming multiple of the light source light;

the light guide module is arranged at one side of the zooming module, which is far away from the light source module, on the light path and is used for receiving and guiding the light source light emitted by the zooming module;

the modulation module is used for receiving the light source light transmitted by the light guide module and modulating the light source light into image light; and

and the lens module is used for receiving the image light and projecting the image light out.

The light guide module comprises a light homogenizing element and a relay lens group, wherein the light homogenizing element is arranged on the light emitting side of the zoom module and is used for homogenizing the light of the light source; the relay lens group is arranged on one side of the dodging element, which is far away from the zoom module.

The light incident side of the light homogenizing element is overlapped with the focal plane of the zoom module, and the light emergent side of the light homogenizing element is overlapped with the focal plane of the relay lens group.

Wherein, even light component includes fly's eye lens or even one of them of light stick.

The modulation module is overlapped with an equivalent focal plane of one side of the relay lens group, which is far away from the dodging element.

The zoom module comprises a first fixed lens, a compensation lens, a zoom lens and a second fixed lens which are sequentially arranged along the propagation direction of the light source light; the compensation lens and the zoom lens are movably disposed between the first fixed lens and the second fixed lens.

The lens module comprises a variable focus lens.

The light source module comprises a laser and a speckle dissipating component, wherein the laser is used for emitting light source light, and the speckle dissipating component is arranged on the light emitting side of the laser and is used for dissipating speckles of the light source light.

The focal plane of one side of the zooming module, which is close to the light source module, is overlapped with the light outlet of the speckle eliminating assembly.

In a second aspect, the disclosure also relates to a projector including the optical engine described above.

According to the optical machine provided by the disclosure, the zoom module is arranged, so that light source light can be emitted to the modulation module after zooming, and image light emitted from the modulation module is projected and emitted after passing through the lens module, so that an image is formed; the zoom module is arranged to change the zoom multiple of the light source light, so that the F-number of the light source light is adjusted, the F-number of the image light emitted from the modulation module is adjusted, the contrast of the image light can be adjusted when the F-number of the lens module is unchanged, and the F-number of the light source light can be matched with the F-number of the lens by adjusting the corresponding zoom multiple when the F-number of the lens module is changed, so that the light efficiency of the optical machine is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of an optical machine in an embodiment provided in the present disclosure.

Fig. 2 is a schematic structural view of a zoom lens group in one embodiment provided by the present disclosure.

Fig. 3 is a schematic diagram of a zooming process of a zoom lens group in one embodiment provided by the present disclosure.

Fig. 4 is a schematic view of the spot shape of light source light in various embodiments provided by the present disclosure.

Fig. 5 is a schematic structural diagram of an optical machine in another embodiment provided in the present disclosure.

Description of the main reference signs

Optical machine 100, 200

Light source module 10

Laser 11

Mirror 12

Focusing lens 13

Speckle removing assembly 15

Diffusion wheel 151

Optical wand 153

Zoom module 30

First fixed lens 31

Compensation lens 33

Zoom lens 35

Second fixed lens 37

Light guiding module 50

Dodging elements 51, 51a, 51b

Relay lens group 53

First relay lens 531

Second relay lens 533

Beam splitting prism 55

Modulation module 70

Lens module 90

Light source light L1

Image light L2

Distance d

Spots A1, A2, A3

F number range B

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings of the embodiments of the present disclosure, in which it is evident that the described embodiments are only some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

The projector adopting the laser as a light source generally needs a series of optical treatments such as beam expansion, light homogenizing, speckle dissipation, collimation and the like to the laser emitted by the laser, so that the laser can uniformly cover the modulation module, and a clear image is modulated. Therefore, the optical engine of the projector generally includes a zoom optical element group that zooms the laser light. However, the zoom magnification of the laser after determining the optical path is usually set to a constant value, that is, the F-number (the ratio of the focal length to the clear aperture) of the zoom optical element group is also set to a constant value. After the modulation module modulates laser into image light, the image light needs to be projected and emitted through a lens, so that an image is formed by projection, in the projection process, the F number of the lens can influence the quality of the projected and emitted image light, and when the F number of the lens is larger than that of the zoom optical element group, the loss of part of the image light can be caused, so that the light efficiency is seriously reduced, and the brightness and the quality of the projected image are influenced. Therefore, a lens with a specific F number needs to be selected to match with the zoom optical element group, thus restricting the flexibility of the projector.

Referring to fig. 1, an optical engine 100 is provided in the embodiments of the present disclosure, and includes a light source module 10, a zoom module 30, a light guiding module 50, a modulation module 70, and a lens module 90. The light source module 10 is configured to emit light source light L1, and the zoom module 30 is disposed on one side of the light source module 10, configured to zoom the light source light L1, and emit the light source light L1, and configured to change a zoom multiple of the light source light L1. The light guiding module 50 is disposed at a side of the zoom module 30 away from the light source module 10 on the light path, and is configured to receive and guide the light source light L1 emitted from the zoom module 30. The modulation module 70 is configured to receive the light source light L1 transmitted by the light guiding module 50, and modulate the light source light L1 into image light L2. The lens module 90 is used for receiving the image light L2 and projecting the image light L2.

According to the optical engine 100 provided by the embodiment of the disclosure, the zoom multiple of the light source light L1 can be adjusted by setting the zoom module 30, so that the emergent angle of the modulated image light L2 is changed, and then different F numbers of the lens module 90 can be matched in real time when the lens module 90 is a zoom lens or the lens module 90 with different F numbers is replaced, thereby being beneficial to improving the flexibility of the optical engine 100 and ensuring the light efficiency of the optical engine 100. When the F number of the lens module 90 is unchanged, the light beam of the image light L2 can be further concentrated by adjusting the zoom multiple of the light source light L1, so that the contrast of the image is improved.

The light source module 10 includes a laser 11, a mirror 12, a focusing lens 13, and a speckle removing assembly 15. Specifically, the light source module 10 includes at least one laser 11 for emitting laser light as the light source light L1. The reflecting mirror 12 is disposed on the light emitting side of the laser 11, and is used for reflecting the light source light L1 to the focusing lens 13, the focusing lens 13 is used for focusing the light source light L1 reflected by the reflecting mirror 12 to the speckle eliminating component 15, and the speckle eliminating component 15 is used for homogenizing the light source light L1 and emitting.

In the present embodiment, the number of the lasers 11 is three, and three lasers with different colors are emitted respectively, and the combined light of the three lasers is the light source light L1. Specifically, the optical machine 100 may be provided with lasers 11 that emit three primary colors of light, which may be red, green, and blue, respectively, that is, three lasers 11 emit red laser light, green laser light, and blue laser light, respectively, and the three colors of laser light combine into white light source light L1 through the reflecting mirror 12 and the focusing lens 13. In other embodiments, the number of lasers 11 may be one, two or more than four, and each laser 11 may emit laser light with other colors, which is not limited in this disclosure.

The laser 11 may be a vertical cavity surface emitting laser, a gas laser, a semiconductor laser, or the like, and the present disclosure is not limited thereto, and is within the scope of the present disclosure as long as it can emit laser light.

The speckle eliminating assembly 15 includes a diffusion wheel 151 and an optical rod 153, wherein the diffusion wheel 151 is disposed on the light emitting side of the focusing lens 13, and is used for receiving and diffusing the light source light L1 projected and emitted by the focusing lens 13. The light rod 153 is disposed on a side of the diffusion wheel 151 away from the focusing lens 13, and is configured to receive the light source light L1 emitted from the diffusion wheel 151, homogenize the light source light L1, and emit the homogenized light. The light rod 153 has a specific principle that the light source light L1 is internally reflected a plurality of times, so that the coherence of the laser light is reduced, and the effect of eliminating speckle is achieved. The light stick 153 may be a solid structure or a hollow structure, and the light stick 153 may be a column or a cone, which is not limited in this disclosure.

Referring to fig. 2 and 3, the zoom module 30 includes a first fixed lens 31, a compensation lens 33, a zoom lens 35, and a second fixed lens 37 sequentially arranged along a propagation direction of the light source light L1. The compensation lens 33 and the zoom lens 35 are movably disposed between the first fixed lens 31 and the second fixed lens 37. Specifically, the positions of the first fixed lens 31 and the second fixed lens 37 are unchanged, the distance from the first fixed lens 31 to the light emitting side of the light rod 153 is fixed, and the distance from the second fixed lens 37 to the light guiding module 50 is fixed, that is, the distance d from the light rod 153 to the light guiding module 50 is fixed. The zoom module 30 can realize zooming of the light source light L1 by changing the positions of the compensation lens 33 and the zoom lens 35 between the first fixed lens 31 and the second fixed lens 37. The zooming of the light source light L1 is mainly achieved by adjusting the distance between the zoom lens 35 and the first and second fixed lenses 31 and 37, and the continuous zooming of the light source light L1 can be achieved by linearly moving the zoom lens 35. By moving the compensation lens 33, an optical error generated during the movement of the zoom lens 35 can be compensated.

In other embodiments, the zoom module 30 may further include only the first fixed lens 31, the zoom lens 35, and the second fixed lens 37, and the compensation lens 33 is omitted; alternatively, the zoom module 30 may further include other optical elements other than those described in the present embodiment, and the present disclosure is not limited thereto, and any zoom modulation of the light source light L1 is possible within the scope of the present disclosure.

With continued reference to fig. 1, the light guiding module 50 includes a light homogenizing element 51, a relay lens group 53 and a beam splitting prism 55, wherein the light homogenizing element 51 is disposed on the light emitting side of the zoom module 30, and is configured to homogenize the light source light L1 emitted from the zoom module 30. The relay lens group 53 is disposed on a side of the dodging element 51 away from the zoom module 30, and is used for guiding and modulating the light source light L1. Specifically, the light equalizing element 51 is configured to equalize the light source light L1. In this embodiment, the light homogenizing element 51a may be a fly eye lens. The relay lens group 53 includes a first relay lens 531 and a second relay lens 533 for guiding the light source light L1 emitted from the dodging element 51 to the dichroic prism 55. The beam splitter prism 55 is disposed on a side of the relay lens group 53 away from the light equalizing element 51, and is used for guiding the light source light L1 to the modulation module 70 and guiding the image light L2 emitted from the modulation module 70 to the lens module 90.

In this embodiment, the focal plane of the zoom module 30 near the light source module 10 coincides with the light outlet of the speckle eliminating module 15, the focal plane of the zoom module 30 near the light guiding module 50 coincides with the light inlet of the light homogenizing element 51a, the focal plane of the relay lens group 53 near the light homogenizing element 51a coincides with the light outlet of the light homogenizing element 51a, and the modulation module 70 coincides with the equivalent focal plane of the relay lens group 53 far from the light homogenizing element 51 a.

Specifically, the focal plane of the zoom module 30 near the light source module 10 coincides with the light outlet of the light rod 153, so that the light source light L1 emitted from the light rod 153 is easily zoomed. The zoomed light source light L1 is converged to the light incident surface of the light homogenizing element 51a, and a light spot is formed on the light incident surface of the light homogenizing element 51a, so that the light homogenizing element 51a homogenizes the light source light L1, and the zoom multiple of the light source light L1 modulated by the zoom module 30 can be obtained by measuring the size of the light spot on the light incident surface of the light homogenizing element 51 a. The light source light L1 emitted from the light equalizing element 51a passes through the relay lens group 53 so as to be projected onto the modulation module 70 in a fixed size, that is, the light source light L1 emitted in different zoom factors is modulated by the relay lens group 53, and then, the light source light L1 having the same size is formed on the modulation module 70, except that the light source light L1 having different zoom factors is modulated into the image light L2 by the modulation module 70 and emitted at different diffusion angles.

Referring to fig. 4, the cross section of the light rod 153 may be configured to be different shapes, so as to modulate the shape of the light source light L1 and achieve different light homogenizing effects. Specifically, the shape of the cross section of the light rod 153 determines the shape of the cross section of the light source light L1 emitted from the light rod 153, that is, the shape of the light spot incident on the light incident surface of the light equalizing element 51a, and the more nearly circular the cross section, the greater the number of angular distribution profiles of the light source light L1 incident on the modulation module 70, and the better the decoherence effect of the light source light L1. When the cross section of the light rod 153 is a quadrangle, the light spot A1 formed on the light incident surface of the light equalizing element 51a is also a quadrangle as shown in fig. 4 (a). The cross section of the light rod 153 may also be arranged in a pentagon to form a spot A2 as shown in (b) of fig. 4, or in a hexagon to form a spot A3 as shown in (c) of fig. 4. The sectional shape of the optical rod 153 is not limited in the present disclosure.

Taking (a) in fig. 4 as an example, by providing the zoom module 30, the size of the spot A1 formed on the light entrance surface of the light equalizing element 51a can be adjusted so as to correspond to the F-number range B of the lens module 90. When the light spot A1 is inscribed in the range B corresponding to the F number of the lens module 90, the image light L2 converted by the light source light L1 can be completely projected and emitted by the lens module 90. When the range of the light spot A1 is larger than the range B corresponding to the F number of the lens module 90, a portion of the light outside the range B cannot be projected and emitted by the lens module 90, thereby reducing the light efficiency. Therefore, by setting the zoom module 30, the size of the light spot A1 can be modulated, and the diffusion angle of the light source light L1 can be modulated, so that when the F number of the lens module 90 is changed, the modulated image light L2 converted by the light source light L1 can be completely emitted through the lens module 90, and the reduction of the light efficiency is avoided.

According to the optical engine 100 provided by the embodiment of the disclosure, the light source light L1 emitted by the light source module 10 is laser light, so that the light source light L1 has a larger expansion allowance, when the zoom module 30 zooms the light source light L1 by different times, the light homogenizing element 51a can cover the diffusion angles of the light source light L1 under different zoom times, so that the light source light L1 with different zoom times is ensured not to generate larger light efficiency loss when passing through the light guiding module 50 and entering the modulation module 70, and the light efficiency is kept under the condition of realizing different zoom times.

The optical engine 100 provided in the present disclosure is specifically described below with reference to specific embodiments.

Example 1

Referring to fig. 1, in an optical engine 100 according to an embodiment of the disclosure, a light emitting surface of an optical rod 153 is 3mm, that is, a cross-sectional size of a light beam of a light source light L1 emitted from the optical rod 153 is 3mm. The zoom range of the zoom module 30 is 3-6 times continuous zooming. The light equalizing element 51a is a fly eye lens.

Table 1 is a table of the relationship between the size of the light spot on the light incident surface of the light homogenizing element 51a and the F number of the corresponding zoom module 30 when the zoom module 30 zooms the light source light L1 at different zoom multiples in the first embodiment of the present disclosure.

Table 1: zoom multiple, spot size and F number relation table

With continued reference to fig. 3, it can be seen from table 1 that by adjusting the positions of the zoom lens 35 and the compensation lens 33 in the zoom module 30, zooming of the light source light L1 can be achieved, that is, the F number of the zoom module 30 is adjusted, so as to adjust the size of the light spot on the light incident surface of the light homogenizing element 51 a. The lens module 90 with different F numbers is favorable to be matched, or the contrast of the image light L2 is improved when the F number of the lens module 90 is unchanged, so that the brightness of the optical machine is improved, and the energy efficiency is improved.

The modulation module 70 may be a digital micromirror device (Digital Micromirror Devices, DMD) chip, and the light source light L1 is modulated into image light L2 and then emitted to form an image by projection. The modulation module 70 may be any other chip capable of modulating the light source light L1 into the image light L2, which is not limited in the present disclosure.

The lens module 90 may be a zoom lens, and the lens module 90 may directly implement zooming through a single lens, so as to match with the zoom module 30 to implement modulation of the image light L2. The image light L2 emitted from the lens module 90 at different F numbers has different projection ratios, that is, the sizes of the images projected and formed at the same distance are different. In other embodiments, the lens module 90 may also include a plurality of lenses with different F numbers, and the lenses with different F numbers may be switched according to the specific usage scenario.

Example two

Referring to fig. 5, a light engine 200 according to a second embodiment of the disclosure includes a light source module 10, a zoom module 30, a light guiding module 50, a modulation module 70 and a lens module 90. The difference from the first embodiment is that the zoom module 30 of the optical engine 200 of the second embodiment includes only the first fixed lens 31, the zoom lens 35, and the second fixed lens 36, and the compensation lens 33 is omitted. The light homogenizing element 51b of the light guiding module 50 is a light homogenizing rod, the light inlet of the light homogenizing element 51b coincides with the focal plane of the zooming module 30, and the light outlet of the light homogenizing element 51b coincides with the focal plane of the relay lens group 53.

According to the optical engine 100 provided by the embodiment of the disclosure, the zoom module 30 is arranged to be matched with the lens module 90, so that the zoom multiple of the image light L2 can be adjusted, and the use flexibility of the optical engine 100 is improved. By arranging the zoom module 30, the zoom multiple of the light source light L1 can be adjusted when corresponding to the lens modules 90 with different F numbers, thereby avoiding light loss of the image light L2 emitted from the lens modules 90 and being beneficial to improving the light efficiency and the energy efficiency.

The foregoing description is only exemplary embodiments of the present disclosure, and not intended to limit the scope of the disclosure, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present disclosure, or direct or indirect application in other related technical fields are included in the scope of the present disclosure.

Claims (10)

1. A light engine, comprising:

the light source module is used for emitting light source light;

the zooming module is arranged on one side of the light source module and is used for zooming the light source light and then emitting the zoomed light; the zooming module is also used for changing the zooming multiple of the light source light;

the light guide module is arranged at one side of the zooming module, which is far away from the light source module, on the light path and is used for receiving and guiding the light source light emitted by the zooming module;

the modulation module is used for receiving the light source light transmitted by the light guide module and modulating the light source light into image light; and

and the lens module is used for receiving the image light and projecting the image light out.

2. The light engine of claim 1, wherein the light guiding module comprises a light homogenizing element and a relay lens group, the light homogenizing element is arranged on a light emitting side of the zoom module and is used for homogenizing the light source light; the relay lens group is arranged on one side of the dodging element, which is far away from the zoom module.

3. The light engine of claim 2, wherein the light entrance side of the light homogenizing element coincides with the focal plane of the zoom module and the light exit side of the light homogenizing element coincides with the focal plane of the relay lens group.

4. The light engine of claim 2, wherein the light homogenizing element comprises one of a fly eye lens or a light homogenizing rod.

5. The optical engine according to claim 2, wherein the modulation module coincides with an equivalent focal plane of the relay lens group on a side away from the dodging element.

6. The light engine of claim 1, wherein the zoom module comprises a first fixed lens, a compensation lens, a zoom lens, and a second fixed lens arranged in order along a propagation direction of the light source light; the compensation lens and the zoom lens are movably disposed between the first fixed lens and the second fixed lens.

7. The light engine of claim 1, wherein the lens module comprises a variable focus lens.

8. The light engine of claim 1, wherein the light source module comprises a laser for emitting the light source light and a speckle dissipating assembly disposed on a light emitting side of the laser for dissipating the speckle of the light source light.

9. The light engine of claim 8, wherein a focal plane of a side of the zoom module adjacent to the light source module coincides with the light exit of the speckle removing assembly.

10. A projector, comprising:

the light engine of any one of claims 1-9.