Projector and ray machine

Abstract

The utility model relates to an optical machine, and the optical machine comprises a light modulation chip which is used for receiving light source light and modulating the light source light into first light and second light which are emitted in different directions; the beam splitter prism is arranged on one side of the light modulation chip and used for guiding the light source light to the light modulation chip and receiving the first light and the second light; the shading module is arranged on the side, away from the light modulation chip, of the beam splitter prism, and the second light irradiates the shading module; the lens module is arranged on one side, far away from the beam splitter prism, of the shading module, and is used for receiving the first light emitted from the beam splitter prism and projecting the first light; wherein the shading module comprises at least two shading pieces, the multiple shading pieces are sequentially arranged in the propagation direction of the second light, and the second light partially irradiates the multiple shading pieces respectively. The ray machine provided by the utility model can reduce the condensation probability of the beam splitter prism, thereby preventing the projection image from generating halo, and facilitating the improvement of the image quality. The utility model also relates to a projector using the optical machine.

Description

Technical Field

[0001] The present application relates to an optical engine and a projector using the optical engine. Background Art

[0002] For a projector optical engine using a Digital Micromirror Device (DMD) as a light modulation chip, since the DMD chip modulates the light from the light source by reflecting the light from the light source through a large number of micromirrors respectively, in addition to the image light projected from the optical engine, there is also ineffective light that is reflected into the optical engine and absorbed by the light blocking sheet or the inner wall of the optical engine. During the use of the optical engine, the ineffective light irradiates inside the optical engine, causing the temperature of the light blocking sheet or the outer shell of the optical engine to rise, and generating a temperature difference with the beam splitting prism inside the optical engine, resulting in the phenomenon of water vapor condensation on the surface of the beam splitting prism, and further causing halo in the image projected by the optical engine, affecting the image quality. Utility Model Content

[0003] The present application discloses an optical engine and a projector using the optical engine, which can reduce the probability of condensation of the beam splitting prism inside the optical engine and ensure the image quality.

[0004] In a first aspect, the present application relates to an optical engine, including:

[0005] A light modulation chip, configured to receive light from a light source and modulate the light from the light source into first light and second light that are emitted in different directions;

[0006] A beam splitting prism, disposed on one side of the light modulation chip, configured to guide the light from the light source to the light modulation chip and configured to receive the first light and the second light;

[0007] A light shielding module, disposed on the side of the beam splitting prism away from the light modulation chip, and the second light irradiates on the light shielding module; and

[0008] A lens module, disposed on the side of the light shielding module away from the beam splitting prism, configured to receive the first light emitted from the beam splitting prism and configured to project and emit the first light;

[0009] Wherein, the light shielding module includes at least two light shielding members, and a plurality of the light shielding members are sequentially disposed along the propagation direction of the second light, and the second light is respectively partially irradiated on the plurality of light shielding members.

[0010] The optical engine disclosed in the embodiments of the present application, by providing a light shielding module including at least two light shielding members, and arranging the plurality of light shielding members in sequence along the propagation direction of the second light, can enable the second light to irradiate different light shielding members in sequence, so that different light shielding members absorb a part of the second light in sequence, and the heat generated after absorbing the second light is distributed on different light shielding members, thereby avoiding too high a temperature difference between other structures where the light is concentrated and the beam splitter prism, reducing the probability of condensation of water vapor on the surface of the beam splitter prism, preventing halos from occurring in the first light projected by the optical engine, and being beneficial to ensuring the image quality.

[0011] In one embodiment, the optical engine further includes a housing and a heat dissipation member. The housing accommodates and fixes the light modulation chip and the beam splitter prism. The heat dissipation member is arranged on one side of the housing along the first direction for conducting the heat inside the housing.

[0012] In one embodiment, the light shielding module includes a first light shielding member. One end of the first light shielding member is connected to the heat dissipation member, and the other end extends along the first direction from the direction of the heat dissipation member and partially covers the side of the beam splitter prism away from the light modulation chip. The first light shielding member at least partially shields the second light.

[0013] In one embodiment, the first light shielding member includes a first light shielding portion and a second light shielding portion. The first light shielding portion is connected to the heat dissipation member and at least partially shields the second light. The second light shielding portion is movably arranged on the heat dissipation member.

[0014] In one embodiment, the second light shielding portion moves along a direction perpendicular to the first direction and parallel to the first light shielding portion to partially shield the second light.

[0015] In one embodiment, the second light shielding portion moves along the first direction to partially shield the second light.

[0016] In one embodiment, the light shielding module further includes a second light shielding member. The second light shielding member is arranged on the side of the first light shielding member away from the beam splitter prism. One end of the second light shielding member is connected to the housing, and the other end of the light shielding member extends from the direction of the housing and partially covers the side of the beam splitter prism away from the light modulation chip.

[0017] In one embodiment, a light passing opening is formed in the second light shielding member, and the first light passes through the light passing opening to enter the lens module.

[0018] In one embodiment, the second light shielding member is integrally formed with the housing.

[0019] In a second aspect, the present application relates to a projector, including:

[0020] The optical engine according to any one of the above embodiments.

[0021] The projector provided by the embodiment of the present application can, by adopting the optical engine in the above embodiment, increase the temperature difference between the beam splitting prism in the optical engine and other structures in the optical engine during use, thereby reducing the probability of water vapor condensing on the surface of the beam splitting prism, and further preventing the first light projected by the optical engine from generating a halo, which is beneficial to ensuring the image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of an optical engine in an embodiment provided by the present application.

[0024] Figure 2 is Figure 1 an exploded structural diagram of...

[0025] Figure 3 It is a schematic diagram of the light distribution on the surface of the beam splitting prism in the embodiment provided by the present application.

[0026] Figure 4 It is a schematic optical path diagram of the optical engine in the embodiment provided by the present application.

[0027] Figure 5 It is a schematic diagram of the light distribution on the surface of the light shielding module in the embodiment provided by the present application.

[0028] Figure 6 It is a schematic structural diagram of the heat dissipation member and the first light shielding member in the embodiment provided by the present application.

[0029] Figure 7 is Figure 6 an exploded structural diagram of...

[0030] Figure 8 It is a schematic structural diagram of the first light shielding member in the first state in the embodiment provided by the present application.

[0031] Figure 9 It is a schematic structural diagram of the first light shielding member in the second state in the embodiment provided by the present application.

[0032] Figure 10 It is a schematic structural diagram of the first light shielding member in the third state in the embodiment provided by the present application.

[0033] Figure 11It is a schematic structural diagram of the first light-shielding member in another embodiment provided by this application.

[0034] Description of main component symbols

[0035] Optical engine 100

[0036] Optical modulation chip 10

[0037] Housing 20

[0038] Beam splitting prism 30

[0039] First prism 31

[0040] Second prism 33

[0041] Surface 331

[0042] First region 32

[0043] Second region 34

[0044] Heat sink 40

[0045] Heat sink fins 41

[0046] Light-shielding module 50

[0047] First light-shielding member 51

[0048] First light-shielding portion 511

[0049] Second light-shielding portion 513

[0050] Second light-shielding member 53

[0051] Light passing port 532

[0052] Galvanometer 60

[0053] Lens module 70

[0054] Light source light L

[0055] First light L1

[0056] Second light L3

[0057] First direction X

[0058] Second direction Y

[0059] The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings. Specific embodiments

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0061] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0062] It should be noted that the concepts such as "first" and "second" mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependent relationships.

[0063] The DMD chip is a light modulation chip with a plurality of micro-reflection units provided on its surface. Each micro-reflection unit has two states of "on" and "off". In different states, the micro-reflection unit deflects to different angles, so as to reflect the light projected onto the micro-reflection unit in different directions. When the DMD chip is applied to the optical engine of a projector, in the "on" state, the micro-reflection unit reflects the received light source light in one direction for emitting, as a part of the image light to be projected onto the projection medium; in the "off" state, the micro-reflection unit reflects the received light source light in another direction for emitting, so as to prevent it from being projected onto the projection medium. Therefore, the DMD chip usually reflects the first light for projecting and forming an image and the second light that does not need to be projected and emitted from the optical engine at the same time. The emission directions of the first light and the second light are different.

[0064] Generally speaking, the structure of the optical engine itself is configured to absorb the second light, so as to prevent the second light from leaking out of the optical engine or being reflected onto the optical path of the first light, which may affect the quality of the projected image. However, since the optical engine generates heat after absorbing the second light, the temperature will rise, and the temperature of the air inside the optical engine will also increase. The beam splitting prism in the optical engine, which is used to guide the light from the light source, the first light, and the second light, usually does not increase much in temperature due to its high light transmittance. Therefore, during the use of the optical engine, a large temperature difference will be generated between the beam splitting prism and other structures in the optical engine, causing the warmer air to flow towards the surface of the cooler beam splitting prism. When it contacts the surface of the beam splitting prism, due to the temperature difference, water vapor in the air will condense, causing water droplets to form on the surface of the beam splitting prism. After the water droplets cover the optical path of the first light, it will affect the first light, resulting in halos in the projected image and affecting the usage effect.

[0065] The condensation of water vapor is affected by multiple factors, including the humidity of the air, the temperature of the surface of the beam splitting prism, and the temperature difference between the beam splitting prism and other structures in the optical engine. Specifically, the higher the humidity of the air, the lower the temperature of the surface of the beam splitting prism, and the higher the temperature difference between the beam splitting prism and other structures in the optical engine, the easier it is for water vapor to condense. The temperature of other structures in the optical engine is related to the overall brightness of the optical engine and the brightness of the played picture. The higher the overall brightness, the higher the energy of the second light received by the optical engine, and the darker the content of the played picture, the higher the proportion of the second light. Therefore, when the optical engine is in an environment with low temperature and high humidity and plays a dark picture in a high-brightness mode, it is more likely to cause condensation on the surface of the beam splitting prism, and the halos in the projected picture are more obvious.

[0066] Please refer to Figure 1 and Figure 2 Referring to FIGS. and, Embodiment 1 of the present application provides an optical engine 100, including an optical modulation chip 10, a housing 20, a beam splitting prism 30, a heat dissipation component 40, a light shielding module 50, a galvanometer 60, and a lens module 70. Among them, the beam splitting prism 30 is used to receive the light from the light source and guide the light from the light source to the optical modulation chip 10. The optical modulation chip 10 is used to modulate the light from the light source into the first light and the second light that are emitted in different directions. The light shielding module 50 is disposed on the side of the beam splitting prism 30 away from the optical modulation chip 10 to receive at least part of the second light. The lens module 70 is disposed on the side of the light shielding module 50 away from the beam splitting prism 30, and is used to receive the first light emitted by the beam splitting prism 30 and project the first light out. The galvanometer 60 is disposed between the light shielding module 50 and the lens module 70 and is used to modulate the first light. The housing 20 is used to accommodate and fix the optical modulation chip 10, the beam splitting prism 30, the light shielding module 50, and the galvanometer 60. The heat dissipation component 40 is disposed on one side of the housing 20 along the first direction X and is used to conduct the heat inside the housing 20.

[0067] Please refer toFigure 3 In this embodiment, on the surface 331 of the beam splitting prism 30 on the side far from the light modulation chip 10, the first light L1 irradiates the center position of the surface 331, and the second light L3 irradiates a corner of the surface 331. The surface 331 is defined with a first area 32 and a second area 34. The first light L1 exits from the beam splitting prism 30 through the first area 32, and the second light L3 passes through the second area 34 and is partially projected onto the light shielding module 50. The light shielding module 50 at least partially covers the second area 34, so that the second light L3 is projected onto the light shielding module 50. During the operation of the optical engine 100, the portion of the second area 34 that is not irradiated by the second light L3 usually has no light passing through. According to the overall brightness during the operation of the optical engine 100, the spot sizes of the first light L1 and the second light L3 will change, and the range of the first area 32 is the maximum brightness that the first light L1 can theoretically reach. In other embodiments, the spot position of the second light L3 will change according to the position of the light modulation chip 10. For example, the position of the spot of the second light L3 can be at the lower left corner, lower right corner, or upper right corner of the first area 32, and the present application does not limit this.

[0068] Please refer to Figure 4 The beam splitting prism 30 includes a first prism 31 and a second prism 33 that are attached to each other. The first prism 31 and the second prism 33 are triangular prisms, and one cylindrical surface of the first prism 31 and the second prism 33 is attached to each other. The light source light L is incident from one side of the first prism 31 and is reflected at the interface between the first prism 31 and the second prism 33, and thus exits from the other side of the first prism 31 onto the light modulation chip 10. The light modulation chip 10 modulates the light source light L into the first light L1 and the second light L3 that exit in two different directions. The first light L1 sequentially passes through the first prism 31 and the second prism 33, and thus exits from the beam splitting prism 30. The second light L3 sequentially passes through the first prism 31 and the second prism 33, and thus is projected onto the light shielding module 50.

[0069] Please refer to Figure 2 、 Figure 4 and Figure 5 The light shielding module 50 includes a first light shielding member 51 and a second light shielding member 53. One end of the first light shielding member 51 is connected to the heat dissipation member 40, and the other end extends along the first direction X from the direction of the heat dissipation member 40 and at least partially covers the side of the beam splitting prism 30 far from the light modulation chip 10. The first light shielding member 51 at least partially blocks the second light. The second light shielding member 53 is disposed on the side of the first light shielding member 51 far from the beam splitting prism 30. One end of the second light shielding member 53 is connected to the housing 20, and the other end of the second light shielding member 53 extends from the direction of the housing 20 and at least partially covers the side of the beam splitting prism 30 far from the light modulation chip 10. A light passing opening 532 is formed in the second light shielding member 53, and the first light L1 passes through the light passing opening 532 to be incident on the lens module 70.

[0070] In this embodiment, the second light-shielding member 53 is integrally formed with the housing 20. In other embodiments, the second light-shielding member 53 can also be fixed to the housing 20 by means of clamping, bonding, screwing, etc. The present application does not limit this.

[0071] Please refer to Figure 6 , a plurality of heat dissipation fins 41 are provided on a side of the heat dissipation member 40 away from the beam splitting prism 30. The heat dissipation member 40 is used to conduct the heat absorbed by the first light-shielding member 51, and increase the contact area with the air through the heat dissipation fins 41, thereby facilitating heat dissipation.

[0072] Please refer to together Figure 6 and Figure 7 , the first light-shielding member 51 includes a first light-shielding portion 511, a second light-shielding portion 513, and a screw 515. The first light-shielding portion 511 is fixedly connected to the heat dissipation member 40 and at least partially shields the second light L3. The second light-shielding portion 53 is movably disposed on the heat dissipation member 40, and the screw 515 is used to fix the relative position of the second light-shielding portion 53 and the heat dissipation member 40. Wherein, the second light-shielding portion 513 moves in a direction perpendicular to the first direction X and parallel to the first light-shielding portion 511 to partially shield the second light L3.

[0073] Specifically, please refer to together Figure 8 , Figure 9 and Figure 10 , in the first state, the second light-shielding portion 513 is completely covered by the first light-shielding portion 511. At this time, the second light L3 is respectively irradiated on the first light-shielding portion 511 and the second light-shielding member 53. And the amount of light of the second light L3 received by the first light-shielding member 51 as a whole is small. Therefore, the temperature of the second light-shielding member 53 after absorbing the second light L is higher. In the second state, the second light-shielding portion 513 partially extends out. At this time, the first light-shielding portion 511, the second light-shielding portion 513, and the second light-shielding member 53 respectively receive a part of the second light L3. The amount of light of the second light L3 received by the first light-shielding member 51 and the second light-shielding portion 53 is similar. Therefore, the temperatures of the first light-shielding member 51 and the second light-shielding member 53 are similar. In the third state, the extended portion of the second light-shielding portion 53 is more. At this time, most of the second light L3 is irradiated on the first light-shielding member 51, and a small part is irradiated on the second light-shielding member 53. Therefore, the temperature of the first light-shielding member 51 is higher.

[0074] In the embodiment of the present application, by providing that the first light-shielding member 51 includes a first light-shielding portion 511 and a second light-shielding portion 513 with movable relative positions, the range of the second light L3 covered by the first light-shielding member 51 can be changed, thereby changing the heat generated after the first light-shielding member 51 and the second light-shielding member 53 absorb the second light L3. Since the first light-shielding member 51 is connected to the heat dissipation member 40 and the second light-shielding member 53 is connected to the housing 20, by adjusting the area of the second light L3 received by the first light-shielding member 51, the temperature difference between the heat dissipation member 40 and the housing 20 can be adjusted, thereby avoiding an excessively high temperature difference between each structure in the optical engine 100 and the beam splitting prism 30, and further avoiding the generation of water mist.

[0075] In another embodiment, please refer to Figure 11 , the first light-shielding portion 511 and the second light-shielding portion 513 can also be arranged such that the second light-shielding portion 513 moves along the first direction X to partially block the second light L3, thereby changing the area of the second light L3 blocked by the first light-shielding member 51. In other embodiments, the second light-shielding portion 513 can also move in other directions parallel to the first light-shielding portion 513 to adjust the area of the second light L3 blocked by the first light-shielding member 51. The ratio of the first light-shielding member 51 to the second light-shielding member 53 can also be preset and fixed, and the present application does not limit this.

[0076] In other embodiments, the light-shielding module 50 can also include three or more light-shielding members. The multiple light-shielding members are arranged in sequence along the emission direction of the second light L3 and respectively receive a part of the second light L3, and the present application does not limit this.

[0077] The galvanometer 60 is used to deflect periodically to change the refraction and emission direction of the first light L1, so that the first light L1 can be projected at different positions periodically, thereby expanding the number of pixels of the projected image and improving the resolution of the projected image.

[0078] In the optical engine 100 provided by the embodiment of the present application, by providing that the light-shielding module 50 includes multiple light-shielding members, a part of the second light can be absorbed respectively, so that the temperature difference between each part in the optical engine 100 and the beam splitting prism 30 is relatively small, the probability of water vapor condensing on the surface of the beam splitting prism 30 can be reduced, which is beneficial to avoiding the phenomenon of halos in the image of the first light L1 projected by the optical engine 100, beneficial to ensuring the image quality, and improving the use experience.

[0079] The embodiment of the present application also provides a projector, which includes the optical engine 100 in the above embodiment. By providing that the light-shielding module 50 includes multiple light-shielding members, a part of the second light can be absorbed respectively, so that the temperature difference between each part in the optical engine 100 and the beam splitting prism 30 is relatively small, the probability of water vapor condensing on the surface of the beam splitting prism 30 can be reduced, which is beneficial to avoiding the phenomenon of halos in the image of the first light L1 projected by the projector, beneficial to ensuring the image quality, and improving the use experience.

[0080] The above are only embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. An optical machine, characterized in that: include: A light modulation chip, used for receiving light from a light source, and modulating the light from the light source into a first light and a second light emitted in different directions; a beam splitter prism, disposed on one side of the light modulation chip, for guiding the light from the light source to the light modulation chip, and for receiving the first light and the second light; a light shielding module, arranged on a side of the beam splitter prism away from the light modulation chip, and the second light is irradiated onto the light shielding module; as well as a lens module, arranged on a side of the light shielding module away from the beam splitter prism, for receiving the first light emitted from the beam splitter prism, and for projecting the first light; Wherein, the shading module includes at least two shading members, and the plurality of shading members are arranged in sequence along the propagation direction of the second light, and the second light is partially irradiated on the plurality of shading members respectively.

2. The optical machine according to claim 1, characterized in that: It also includes a shell and a heat sink, wherein the shell accommodates and fixes the light modulation chip and the beam splitter prism, and the heat sink is arranged on one side of the shell along a first direction to conduct heat inside the shell.

3. The optical machine according to claim 2, characterized in that: The shading module includes a first shading member, one end of which is connected to the heat sink, and the other end extends from the heat sink along the first direction and partially covers the side of the beam splitter prism away from the light modulation chip, and the first shading member at least partially blocks the second light.

4. The optical machine according to claim 3, characterized in that: The first light shielding member includes a first light shielding portion and a second light shielding portion. The first light shielding portion is connected to the heat sink and at least partially shields the second light. The second light shielding portion is movably disposed on the heat sink.

5. The optical machine according to claim 4, characterized in that: The second light shielding portion moves in a direction perpendicular to the first direction and parallel to the first light shielding portion to partially shield the second light.

6. The optical machine according to claim 4, characterized in that: The second light shielding portion moves along the first direction to partially shield the second light.

7. The optical machine according to claim 3, characterized in that: The shading module also includes a second shading member, which is arranged on a side of the first shading member away from the dichroic prism, one end of the second shading member is connected to the shell, and the other end of the second shading member extends from the direction of the shell and partially covers the side of the dichroic prism away from the optical modulation chip.

8. The optical machine according to claim 7, characterized in that: The second light shielding member is provided with a light opening, and the first light passes through the light opening to be incident on the lens module.

9. The optical machine according to claim 7, characterized in that: The second light shielding member is integrally formed with the housing.

10. A projector, characterized in that: include: An optical machine according to any one of claims 1 to 9.

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