Projection ray machine
By setting light blocking elements behind the dimmable light path assembly of the projector, the laser offset light ray is avoided to directly illuminate the shell, and the plastic shell is easily burned through, leaking light and burning under laser irradiation, improving the safety of the equipment.
Patent Information
- Application Number
- CN202420770707.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-04-12
AI Technical Summary
The plastic shell of existing laser projectors is prone to burn through, leak light, and burn under long-term laser irradiation, which poses safety hazards.
A projector is designed to selectively block offset light by providing light blocking elements behind the dimmable light path assembly to prevent it from illuminating the shell directly, thereby preventing the shell from being overheated and deformed.
It effectively avoids concentrated laser irradiation of the plastic shell, improves the safety of the projector, and prevents accidents such as burning through, light leakage, and combustion of the shell.
Smart Images
Figure CN222896337U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a projection optical machine. Background Art
[0002] Laser projectors use laser as the projection light source, which has the advantages of high brightness, high color reproduction and high contrast. Laser beams are highly concentrated and have extremely high energy density, so laser projectors have higher requirements in terms of safety and reliability.
[0003] One type of laser projector mainly uses metal materials such as aluminum alloy and magnesium-aluminum alloy to form its shell. The shell formed by the above metal materials needs to be machined and surface-film treated after die-casting, which is complex and costly. Another type of laser projector mainly uses resin materials to form its shell. Although the shell formed by the above resin material is conducive to simplifying the process and reducing costs, there is a risk of being burned by the high temperature of the laser beam. If the laser beam is irradiated for a long time, the shell may burn through and leak light, leading to safety accidents such as combustion. Therefore, for the shell formed by resin materials, higher requirements are placed on flame retardancy and linear thermal expansion. Utility Model Content
[0004] The present disclosure discloses a projection optical machine, which can avoid concentrated laser irradiation on a plastic housing and improve safety.
[0005] In a first aspect, the present disclosure relates to a projection optical machine, comprising: a housing, which is provided with a projection window and surrounds a hollow space connected to the projection window; a first lens group, located in the hollow space, for receiving and emitting a first light; an adjustable optical path component, located in the hollow space and on the optical path of the first light, for adjusting the propagation path of the first light and emitting it as a second light; and a light blocking element, located on the optical path of the second light, for blocking a portion of the second light to prevent the portion of the second light from directly irradiating the housing;
[0006] Another part of the second light is emitted from the projection window as image light, and the first light, the second light and the image light all include lasers.
[0007] Wherein, the adjustable optical path component includes a reflector, the projection optical engine also includes a prism, the light blocking element is located between the reflector and the prism, and the prism is used to project the image light from the light blocking element to the projection window.
[0008] Wherein, the light blocking element is a sheet structure with an opening at the center.
[0009] The second light includes a first portion of light and a second portion of light, the opening is used to transmit the first portion of light as the image light, and the second portion of light is reflected by the light blocking element.
[0010] The second part of the second light is diffusely reflected on the surface of the light blocking element.
[0011] Wherein, a divergence angle of the second light is smaller than a divergence angle of the light reflected by the light blocking element.
[0012] The second light includes a first portion of light and a second portion of light, the opening is used to transmit the first portion of light as the image light, and the second portion of light is absorbed by the light blocking element.
[0013] The reflector has a reflective surface for reflecting the second light, and the surface of the light-blocking element for reflecting or absorbing the second portion of light faces the reflective surface.
[0014] Wherein, the light blocking element is made of metal.
[0015] Wherein, the projection light engine comprises two light blocking elements which are arranged at an interval.
[0016] The projection light machine provided by the present invention includes a first lens group, an adjustable light path component and a light blocking element located in a plastic shell; the light blocking element is located on the light path behind the adjustable light path component, and selectively blocks part of the light from the second light from the adjustable light path component that has undergone path deviation to prevent it from directly irradiating the shell, which is beneficial to prevent the laser from being concentrated on the plastic shell, thereby preventing the shell from burning through, light leakage from the projection light machine, combustion accidents, etc. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a schematic diagram of the structure of a projection optical machine in an embodiment provided by the present disclosure.
[0019] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the projection optical machine.
[0020] Figure 3 for Figure 2 Schematic diagram of the planar structure of the first light blocking sheet.
[0021] Figure 4 yes Figure 2 Schematic diagram of the light propagation path in the projection light path of the projection optical machine shown.
[0022] Main component symbols
[0023] Projection light machine 100
[0024] Housing 10
[0025] Projection Window 11
[0026] Hollow Space 12
[0027] Projection light path 20
[0028] First lens group 21
[0029] First lens 211
[0030] Fly-eye lens 212
[0031] Second lens 213
[0032] Adjustable optical path component 22
[0033] Reflector 221
[0034] Reflective surface 222
[0035] First light blocking element 23
[0036] Opening 231
[0037] Surface 232
[0038] The second light blocking element 24
[0039] Second lens group 25
[0040] The third lens 251
[0041] Prism 252
[0042] First Light L1
[0043] Second Light L2
[0044] First part light L21
[0045] Part II Light L22
[0046] Image light L0
[0047] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0048] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.
[0049] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a component centered thereon. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a component centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0050] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0051] Please also read Figure 1 and Figure 2 The projection light machine 100 provided in the embodiment of the present disclosure includes a housing 10 and a projection light path component 20. The housing 10 is provided with a projection window 11 and surrounds a hollow space 12 connected to the projection window 11. The projection light path component 20 is located in the hollow space 12 and is used to project the image light L0 from the projection window 11 out of the hollow space 12. The projection light L0 is projected onto a projection medium (e.g., a screen, a wall) to present a projection image.
[0052] At least part of the housing 10 is made of plastic. The image light L0 includes laser. In this embodiment, the image light L0 is laser. The projection optical path component 20 includes a fixed optical path component and an adjustable optical path component, and the adjustable optical path component includes, for example, a position-adjustable reflector for changing the direction of the light beam.
[0053] During the propagation of the laser in the projection light path 20, there is a possibility that the light path may be offset (that is, there is an angle or direction deviation between the actual light path and the preset path). If the light path is offset and the laser is concentrated on the plastic part of the shell 10, it is easy to cause the risk of overheating, deformation, or even combustion of the irradiated plastic part, thereby damaging the shell 10 and causing danger. In the embodiment of the present disclosure, a light blocking element is provided in the projection light path 20 to block the light whose light path is offset, so as to prevent the light whose light path is offset from directly irradiating the shell, which is beneficial to improve the problem of overheating, deformation, or even combustion caused by directly irradiating the plastic part of the shell when the light path is offset.
[0054] In addition, due to the adjustability of the adjustable optical path component, the emitted laser light is more likely to have optical path deviation. In the disclosed embodiment, by arranging a light blocking element after the adjustable optical path component in the projection optical path 20, the optical path variation effect is better improved.
[0055] See also Figure 2 In this embodiment, the projection optical path component 20 includes a first lens group 21, an adjustable optical path component 22, a first light blocking element 23, a second light blocking element 24 and a second lens group 25 which are sequentially located on the optical path. The first lens group 21 and the second lens group 25 constitute the above-mentioned fixed optical path component. By arranging the first light blocking element 23 and the second light blocking element 24 after the adjustable optical path component 22 (that is, arranging the first light blocking element 23 and the second light blocking element 24 on the path of the light emitted from the adjustable optical path component 22), the first light blocking element 23 and the second light blocking element 24 block the offset light from irradiating the plastic part of the housing 10 in the adjustable range of the adjustable optical path component 22.
[0056] In other embodiments of the present disclosure, the projection light path component 20 may include a plurality of adjustable light path components 22 , and the projection light path component 20 may accordingly be provided with one or more light blocking elements for each adjustable light path component 22 .
[0057] In this embodiment, the projection optical path 20 includes a light source (not shown) for emitting the first light L1. The first lens group 21 is used to receive and modulate the first light L1 and then emit it to the adjustable optical path component 22. The adjustable optical path component 22 is used to adjust the propagation optical path of the first light L1 from the first lens group 21 and emit it as the second light L2. The first light blocking element 23 and the second light blocking element 24 allow part of the second light L2 to pass through and prevent another part of the second light L2 from passing through. The part of the second light L2 emitted from the second light blocking element 23 is defined as the image light L0. The second lens group 25 is used to modulate the received image light L0 and then emit it from the projection window 11 of the housing 10.
[0058] In this embodiment, the light source light, the first light L1, the second light L2 and the image light L0 are lasers. In other embodiments of the present disclosure, the light source light, the first light L1, the second light L2 and the image light L0 may be partially lasers (eg, including both lasers and fluorescence).
[0059] In this embodiment, the first lens group 21 includes a first lens 211, a fly-eye lens 212, and a second lens 213. The first lens 211 is used to receive and collimate the light from the light source, that is, to convert the light from the light source into parallel light. The fly-eye lens 212 is used to receive the parallel light and focus the parallel light and transmit it to the second lens 213. The second lens 213 is used to homogenize the light from the fly-eye lens 212 and then emit it as the first light L1.
[0060] In this embodiment, the adjustable optical path component 22 includes a reflector 220 having a reflective surface 221. The reflective surface 221 is used to receive and reflect the second light L2 from the second lens 213. The propagation paths of the first light L1 and the second light L2 are different. In other embodiments of the present disclosure, the adjustable optical path component 22 can be other types of optical elements, such as a lens, a lens group, etc.
[0061] During the manufacturing process of the projection light machine 100 of this embodiment, each optical element in the first lens group 21 (including the first lens 211, the fly-eye lens 212 and the second lens 213) is directly fixed to a preset position on the housing 10 by means of locking screws, dispensing glue, pressing with elastic devices, etc., with a preset placement angle to guide and modulate the light of the light source.
[0062] Due to the existence of the work error, the beam of the first light L1 emitted from the first lens group 21 may be offset. In this embodiment, the propagation path of the first light L1 is adjusted by the adjustable optical path component 22 to improve the beam shape and compensate for the accumulated work error generated by the first lens group 21.
[0063] Different from the first lens group 21, during the installation of the adjustable optical path component 22, the adjustable optical path component 22 is not directly fixed to the housing 10, but the placement angle of the adjustable optical path component 22 is adjusted first. By continuously adjusting the angle of the adjustable optical path component 22, the inclination angle of the reflective surface 221 is adjusted, thereby adjusting the propagation direction of the second light L2. When the propagation direction of the second light L2 is consistent with the preset direction, the adjustment of the adjustable optical path component 22 is stopped, and the adjustable optical path component 22 is fixed at the current placement angle.
[0064] For the adjustable optical path component 22, due to its adjustable property during the manufacturing process of the projection optical machine 10, the optical path (including the first light L1, the second light L2 and the image light L0) is prone to deviation. That is, in addition to propagating along the preset optical path and angle, a small part of the second light L2 may propagate along a non-preset optical path, and finally easily irradiate on the housing 10.
[0065] Since the second light L2 emitted by the adjustable optical path component 22 is a laser, and the housing 10 is made of plastic, when the laser is concentratedly irradiated on the housing 10, it is easy to burn through the housing 10, resulting in light leakage and / or burning. In the disclosed embodiment, the first light blocking element 23 and the second light blocking element 24 change the propagation path of the light with the above-mentioned emission light path deviation to prevent it from being concentrated on the housing 10.
[0066] See also Figure 3, the first light blocking element 23 is a sheet-like structure with an opening 231 in the center. In this embodiment, the first light blocking element 23 has a rectangular plane profile and a circular opening 231 is opened in the center. In other embodiments of the present disclosure, the opening 231 may also be rectangular or irregular in shape. The shape of the opening 231 may be related to the requirements of the subsequent projection light path.
[0067] The first light blocking element 23 has a surface 232 facing the adjustable optical path component 22. The second light L2 emitted from the adjustable optical path component 22 is directly incident on the first light blocking element 23 without passing through any optical element. The second light L2 includes a first portion of light L21 and a second portion of light L22. The second portion of light L22 is located at the periphery of the first portion of light L21. That is, the divergence angle of the second portion of light L22 is greater than the divergence angle of the first portion of light L21.
[0068] The first portion of light L21 is incident on the area where the opening 231 is located, and is transmitted from the opening 231 to the second light blocking element 24. The second portion of light L21 is incident on the surface 232 of the adjustable light path component 22. The first light blocking element 21 is made of an opaque material, and the second portion of light L21 incident on the surface 232 is prevented from propagating to the subsequent light path of the projection light path 20.
[0069] See also Figure 4 In this embodiment, the surface 232 of the first light blocking element 23 is used to reflect the second portion of light L21. Figure 4 It can be seen intuitively from the circled areas A and B that the light reflected from the surface 232 is more dispersed than the second portion of light L22 incident on the surface 232, which is beneficial to prevent the laser from being concentrated on the housing 10. The reflection effect of the second light blocking element 24 on the light can be referred to in Figure 4 The reflection effect of the first light blocking element 23 on light is not described in detail.
[0070] Furthermore, the surface 232 is a rough surface, and the surface 232 of the first light blocking element 23 is used to diffusely reflect the second portion of light L21 , which makes the light reflected from the surface 232 more divergent, and better avoids the light from radiating the housing 10 in a concentrated manner.
[0071] In other embodiments of the present disclosure, the surface 232 is used to absorb at least a portion of the second portion of light L22 , which helps to reduce the amount of light irradiated on the housing 10 , thereby helping to avoid damaging the housing 10 .
[0072] The first light blocking element 23 is made of heat-resistant and high-temperature resistant material to avoid being damaged by the laser. In this embodiment, the first light blocking element is made of metal. When the first light blocking element 23 is used to absorb the second part of the light 232, it is necessary to use a material with better thermal conductivity.
[0073] In this embodiment, the second light blocking element 24 and the first light blocking element 23 have substantially the same material, structure and function, which will not be described in detail. In other embodiments of the present disclosure, the first light blocking element 23 and the second light blocking element 24 may have different materials, structures, and / or functions.
[0074] In other embodiments of the present disclosure, the projection optical path 20 may include other numbers (e.g., one or more than three) of light blocking elements. The number of light blocking elements is related to the length of the optical path, the divergence angle of the light, the amount of light, the distance between the optical elements, the size of the space in the housing 10, the cost of the projection optical machine 100, etc.
[0075] In other embodiments of the present disclosure, the first light blocking element 23 and the second light blocking element 24 may be disposed at different positions.
[0076] In other embodiments of the present disclosure, the first light blocking element 23 and the second light blocking element 24 may be arranged non-adjacently. That is, in other embodiments of the present disclosure, other optical elements are arranged between the first light blocking element 23 and the second light blocking element 24. The second light emitted from the first light blocking element 23 is incident on the second light blocking element 24 after passing through the above-mentioned “other optical elements”.
[0077] Please refer to Figure 2 In this embodiment, the second lens group 25 includes a third lens 251 and a prism 252 which are sequentially arranged on the optical path of the image light L0. The third lens 251 is used to focus the image light L0 onto the prism 252, and the prism 252 is used to guide the image light L0 to be emitted from the projection window 11.
[0078] The projection light machine 100 provided in the embodiment of the present disclosure includes a first lens group 21, an adjustable light path component 22, a first light blocking element 23 and a second light blocking element 24 located in a plastic shell 10; the first light blocking element 23 and the second light blocking element 24 are located on the optical path behind the adjustable light path component 22, and selectively block (reflect or absorb) the second part of the light L22 in the second light L2 that has undergone path deviation to prevent it from directly irradiating the shell, which is beneficial to prevent the laser from being concentrated on the plastic shell 10, thereby preventing the shell from burning through, light leakage from the projection light machine 100, combustion accidents, etc.
[0079] The above descriptions are merely embodiments of the present disclosure and are not intended to limit the patent scope of the present disclosure. Any equivalent structure or equivalent process transformation made using the contents of the present disclosure specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present disclosure.
Claims
1. A projection optical machine, characterized in that: include: A shell body having a projection window and surrounding a hollow space connected to the projection window; A first lens group is located in the hollow space and is used to receive and emit the first light; An adjustable optical path component, located in the hollow space and on the optical path of the first light, and used for adjusting the propagation path of the first light and then emitting it as the second light; as well as a light blocking element, located on the optical path of the second light, and used for blocking part of the second light to prevent the part of the second light from directly irradiating the housing; Another part of the second light is emitted from the projection window as image light, and the first light, the second light and the image light all include lasers.
2. The projection optical machine according to claim 1, characterized in that: The adjustable optical path component includes a reflector, the projection light engine also includes a prism, the light blocking element is located between the reflector and the prism, and the prism is used to project the image light from the light blocking element to the projection window.
3. The projection optical machine according to claim 2, characterized in that: The light blocking element is a sheet-like structure with an opening at the center.
4. The projection optical machine according to claim 3, characterized in that: The second light includes a first portion of light and a second portion of light. The opening is used to transmit the first portion of light as the image light, and the second portion of light is reflected by the light blocking element.
5. The projection optical machine according to claim 4, characterized in that: The second part of the second light is diffusely reflected on the surface of the light blocking element.
6. The projection optical machine according to claim 4, characterized in that: A divergence angle of the second light is smaller than a divergence angle of the light reflected by the light blocking element.
7. The projection optical machine according to claim 3, characterized in that: The second light includes a first portion of light and a second portion of light. The opening is used to transmit the first portion of light as the image light, and the second portion of light is absorbed by the light blocking element.
8. The projection optical machine according to claim 4 or 7, characterized in that: The reflector has a reflective surface for reflecting the second light, and a surface of the light blocking element for reflecting or absorbing the second portion of light faces the reflective surface.
9. The projection optical machine according to any one of claims 1 to 7, characterized in that: The light blocking element is made of metal.
10. The projection optical machine according to any one of claims 1 to 7, characterized in that: The projection light engine comprises two light blocking elements which are spaced apart from each other.