Projector with stray light elimination structure

Abstract

The utility model relates to a projector with a stray light elimination structure. The projector comprises a shell, a vertically upward light cup assembly arranged in the shell, a horizontal air duct located above the light cup assembly, and an LCD module arranged in the horizontal air duct. One end of the horizontal air duct is provided with a circulating fan which enables air flow on the upper and lower sides of the LCD module to circulate and convect, and the side wall of the other end is provided with a boss and a first reflection slope from bottom to top; the boss is provided with a second reflection inclined plane which reflects the light vertically and upwards. A horizontal light emitting channel is arranged above the horizontal air channel, a mounting position is arranged in the light emitting channel, a light blocking part located over the second reflection inclined plane is arranged at the lower end of the mounting position, and a light blocking plate for blocking light from the first reflection inclined plane is arranged at the position, located above the LCD module, of the lower portion of the light emitting channel; through cooperation of the first reflection inclined plane, the second reflection inclined plane and the light barrier, stray light can be effectively blocked and filtered, and the image quality of the projector can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of projectors, in particular to a projector with a stray light elimination structure. Background Art

[0002] A projector is a device that can project images or videos onto a screen. It can be connected to external devices such as computers, VCDs, DVDs, BDs, game consoles, DVs, etc. through different interfaces and play corresponding video signals. With the continuous development of modern projector technology, the integration of parts in projectors is getting higher and higher, and their size is getting smaller and smaller, so projectors are widely used in homes, offices, schools and entertainment venues. In a projector, a light output device is required, such as a projector's optical engine, to provide light source projection. The optical engine transmits light through the LCD liquid crystal module and then reflects the light to the lens. The lens focuses the light to project a clear picture.

[0003] In the prior art, the optical path structure of the projector is not reasonably designed, and the arrangement of the optical path structure cannot be fully utilized to simplify the overall structure of the projector. The side wall of the shell located on the backlight side of the LCD liquid crystal module will reflect the light reflected from this part into the lens. In order to reduce the influence of this part of stray light on the image quality, the common method in the industry is to change the reflectivity of the optical path surface, such as sticking some foam with low reflectivity, tape, etc. on the inner wall of the shell. However, this method can only reduce the influence of stray light, but cannot be completely isolated. The stray light reflected by the foam and tape will still enter the lens and have a certain influence on the image quality, and it will also make the optical path structure more complicated. Therefore, in order to optimize the existing projector, it is necessary to propose a projector with a stray light elimination structure while ensuring the rationality of the optical path structure and eliminating the influence of the optical path stray light on the image quality. Utility Model Content

[0004] The purpose of the utility model is to provide a projector with a stray light elimination structure in view of the deficiencies of the prior art, and the projector with the stray light elimination structure can well solve the above-mentioned problems.

[0005] In order to achieve the above requirements, the technical solution adopted by the utility model to solve its technical problems is:

[0006] A projector with a stray light elimination structure is provided, comprising a shell, wherein a vertically upward light cup assembly, a horizontal air duct located above the light cup assembly, and an LCD module arranged in the horizontal air duct are arranged in the shell; a circulating fan for circulating airflows on the upper and lower sides of the LCD module is arranged at one end of the horizontal air duct, and a boss and a first reflecting slope are arranged from bottom to top on the side wall of the other end; a second reflecting slope for reflecting light vertically upward is arranged on a side wall of the boss facing the light cup assembly; a horizontal light outlet channel is arranged in the shell above the horizontal air duct, a mounting position for mounting a reflector is arranged in the light outlet channel above the LCD module, a light blocking portion located directly above the second reflecting slope is arranged at the lower end of the mounting position, and a light blocking plate for blocking light from the first reflecting slope is arranged at the lower part of the light outlet channel located above the LCD module.

[0007] In the projector with the stray light elimination structure of the utility model, the first reflective inclined surface is arc-shaped and its concave surface faces the LCD module.

[0008] In the projector with the stray light elimination structure of the utility model, the side end surface of the LCD module is horizontally opposite to the middle part of the first reflective inclined surface.

[0009] In the projector with the stray light elimination structure of the utility model, the light blocking plate is in the shape of a long strip and is arranged along the width direction of the light exit channel.

[0010] In the projector with the stray light elimination structure of the utility model, the light blocking plate is integrally connected with the housing.

[0011] In the projector with the stray light elimination structure of the utility model, a heat-insulating glass is further arranged between the LCD module and the optical cup assembly, and the heat-insulating glass is horizontally opposite to the second reflective inclined surface.

[0012] The utility model describes a projector with a stray light elimination structure, wherein a vertical air duct connected to the horizontal air duct is provided in the shell at one end thereof, a partition plate is vertically provided in the vertical air duct, the upper end of the partition plate abuts against one end of the LCD module, the circulating fan is provided in the vertical air duct and is located on a side of the partition plate facing the light cup, a vent is provided on the partition plate corresponding to the circulating fan, and a heat dissipation fin is penetrated through the inner wall of the vertical air duct, and the heat dissipation fin is located on a side of the partition plate away from the circulating fan.

[0013] In the projector with the stray light elimination structure described in the utility model, the heat dissipation fins are provided in plurality and are arranged in a matrix in the longitudinal direction.

[0014] The beneficial effects of the utility model are as follows: the light on the backlight side of the LCD module can be directly reflected upwards by the first reflecting bevel and blocked by the light blocking portion, and the stray light that intends to enter the lens can be blocked by the cooperation of the second reflecting bevel and the light blocking plate, thereby preventing the reflected stray light emitted by the optical cup and located on the side of the LCD liquid crystal module away from the lens from entering the lens and thus affecting the imaging of the projector, and effectively improving the picture quality of the projector. At the same time, the circulating fan can also be used to circulate the heat dissipation of the LCD module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0016] Figure 1 It is a rear view of the projector with the stray light elimination structure of the utility model.

[0017] Figure 2 yes Figure 1 AA section view.

[0018] Figure 3 yes Figure 2 A magnified view of the local structure at the position of the first reflecting surface. DETAILED DESCRIPTION

[0019] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0022] Moreover, the terms "up, down, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be combined with the technical solution in the embodiments of the utility model for a clear and complete description. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0024] The projector with the stray light elimination structure in the preferred embodiment of the utility model is as follows Figure 1-3As shown, it includes a housing 10, in which a vertically upward optical cup assembly 20 is arranged, a horizontal air duct 30 located above the optical cup assembly 20, and an LCD module 40 arranged in the horizontal air duct 30. The optical cup assembly 20 specifically includes an optical cup body 21 and a rear Fresnel lens 22 sealed on the light outlet of the optical cup body 21, and the lower end of the optical cup body 21 is a light source 50 and a heat sink 60 for dissipating heat for the light source 50. Correspondingly, a heat fan 70 for blowing air to cool the heat sink 60 is arranged on the housing 10. A circulating fan 80 for circulating airflow on the upper and lower sides of the LCD module 40 is arranged at one end of the horizontal air duct 30, and a boss 90 and a first reflective slope 100 are arranged on the side wall of the other end from bottom to top. A second reflective slope 91 for reflecting light vertically upward is provided on one side wall of the boss 90 facing the optical cup assembly 20; a horizontal light outlet channel 110 is provided above the horizontal air duct 30 in the housing 10, and a focusing lens 120 is provided in the light outlet end of the light outlet channel 110. After installation, the lens 120 is located above the circulation fan 80. A mounting position 140 for mounting a reflector 130 is provided above the LCD module 40 in the light outlet channel 110, and a light blocking portion 141 located directly above the second reflective slope 91 is provided at the lower end of the mounting position 140, and a light blocking plate 150 for blocking light from the first reflective slope 100 is provided at the lower part of the light outlet channel 110 located above the LCD module 40. In addition, a front Fresnel lens 240 is embedded on the upper inner wall of the horizontal air duct. The light emitted by the light source passes through the rear Fresnel lens 22, the LCD module and the front Fresnel lens 240 in sequence and enters the lens 120 through the reflector. When working, the light 200 on the backlight side of the LCD module 40 can be directly reflected upward through the first reflecting bevel 100 and blocked by the light blocking portion 141, and the stray light that wants to enter the lens 120 can be blocked by the cooperation of the second reflecting bevel 91 and the light blocking plate 150, thereby preventing the reflected stray light 300 emitted by the light cup and located on the side of the LCD liquid crystal module away from the lens 120 from entering the inside of the lens 120, thereby affecting the imaging of the projector, and can effectively improve the picture quality of the projector. At the same time, the circulating fan 80 can also be used to circulate and dissipate heat for the LCD module 40.

[0025] In this embodiment, the first reflective inclined surface 100 is arc-shaped and its concave surface faces the LCD module 40 . The arc shape is more conducive to the flow of airflow, so that the airflow can circulate smoothly from the bottom to the top of the LCD module 40 .

[0026] In this embodiment, the side end surface of the LCD module 40 is horizontally opposite to the middle of the first reflective inclined surface 100 to achieve the purpose of evenly distributing the airflow, so that the convection of the LCD module 40 is more uniform.

[0027] In this embodiment, the light blocking plate 150 is in a long strip shape and is disposed along the width direction of the light output channel 110 to increase the light blocking area of ​​the light blocking portion 141 and ensure that stray light in the left and right directions can be blocked.

[0028] In this embodiment, the light blocking plate 150 is integrally connected to the housing to facilitate manufacturing and processing while reducing assembly steps.

[0029] In this embodiment, a heat-insulating glass 160 is further provided between the LCD module 40 and the optical cup assembly 20. The heat-insulating glass 160 is horizontally opposite to the second reflective slope 91 to reduce the heat radiated from the optical cup body 21 to the LCD module 40. At the same time, it can also form two upper and lower opposite air ducts 170 below the LCD module 40, so that the lower air duct can divert the airflow to the upper surface of the heat-insulating glass 160, and the air duct further dissipates the heat.

[0030] In this embodiment, a vertical duct 180 connected to the horizontal duct 30 is provided at one end of the shell 10, and a partition plate 190 is vertically provided in the vertical duct 180. The upper end of the partition plate 190 abuts against one end of the LCD module 40. The circulation fan 80 is arranged in the vertical duct 180 and is located on the side of the partition plate 190 facing the light cup. A vent 210 is provided on the partition plate 190 corresponding to the circulation fan 80. A heat dissipation fin 220 is penetrated through the inner wall of the vertical duct 180. The heat dissipation fin 220 is located on the side of the partition plate 190 away from the circulation fan 80. Through the cooperation of the circulation fan 80, the partition plate, the vent 210 and the heat dissipation fin 220, the LCD module 40 and the insulation glass 160 can be quickly cooled to avoid excessive internal temperature. At the same time, the heat dissipation fin 220 embedded in the shell can also transfer a certain amount of heat to the shell for dissipation, which speeds up the heat dissipation speed and ensures the sealing of the inside of the shell.

[0031] In this embodiment, a plurality of heat dissipation fins 220 are provided and arranged in a matrix in the longitudinal direction, so that convection airways 230 are formed between adjacent heat dissipation fins 220 in the upper, lower, left, and right directions, further increasing the contact area with the convection air and achieving the purpose of improving the heat dissipation speed.

[0032] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A projector with a stray light elimination structure, characterized in that: The invention comprises a shell, wherein a vertically upward optical cup assembly, a horizontal air duct located above the optical cup assembly, and an LCD module located in the horizontal air duct are arranged in the shell; a circulating fan for circulating airflow on the upper and lower sides of the LCD module is arranged at one end of the horizontal air duct, and a boss and a first reflecting bevel are arranged on the side wall of the other end from bottom to top; a second reflecting bevel for reflecting light vertically upward is arranged on a side wall of the boss facing the optical cup assembly; a horizontal light outlet channel is arranged above the horizontal air duct in the shell, a mounting position for mounting a reflector is arranged above the LCD module in the light outlet channel, a light blocking portion located directly above the second reflecting bevel is arranged at the lower end of the mounting position, and a light blocking plate for blocking light from the first reflecting bevel is arranged at the lower part of the light outlet channel located above the LCD module.

2. The projector with stray light elimination structure according to claim 1, characterized in that: The first reflective inclined surface is arc-shaped and its concave surface faces the LCD module.

3. The projector with stray light elimination structure according to claim 2, characterized in that: The side end surface of the LCD module is horizontally opposite to the middle part of the first reflective inclined surface.

4. The projector with stray light elimination structure according to claim 1, characterized in that: The light blocking plate is in a long strip shape and is arranged along the width direction of the light exit channel.

5. The projector with stray light elimination structure according to claim 4, characterized in that: The light blocking plate is integrally connected to the housing.

6. The projector with stray light elimination structure according to claim 1, characterized in that: A heat-insulating glass is also provided between the LCD module and the optical cup assembly, and the heat-insulating glass is horizontally opposite to the second reflective inclined surface.

7. The projector with stray light elimination structure according to claim 1, characterized in that: A vertical air duct connected to the horizontal air duct is provided in the shell at one end thereof, a partition plate is vertically provided in the vertical air duct, an upper end of the partition plate abuts against one end of the LCD module, the circulation fan is provided in the vertical air duct and is located on a side of the partition plate facing the light cup, a vent is provided on the partition plate corresponding to the circulation fan, a heat dissipation fin is penetrated through the inner wall of the vertical air duct, and the heat dissipation fin is located on a side of the partition plate away from the circulation fan.

8. The projector with stray light elimination structure according to claim 7, characterized in that: The heat dissipation fins are provided in plurality and arranged in a matrix in the longitudinal direction.

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