Bidirectional projection device

Abstract

The utility model relates to a bidirectional projection device, which comprises a double-lens projector and a light splitting mechanism, a light splitting mechanism and a light emitting mechanism are arranged in the double-lens projector, the double-lens projector comprises a first lens and a second lens which are opposite in direction, and the light splitting mechanism is located between the first lens and the second lens and located on a path of a light path of the light emitting mechanism. According to the utility model, through the arrangement of the dual-lens projector, the light splitting mechanism and other components, after the LED matrix light source and the LCE liquid crystal screen are matched with each other to project a picture through the matching relationship between the light splitting mechanism and the dual-lens projector, the projected light irradiates on the spectroscope, and at the moment, part of the light is reflected out along the direction towards the lens II; the light splitting effect is achieved by arranging the total reflection mirror, the first lens and the second lens, and the effect of refracting the light irradiating towards the direction of the total reflection mirror is achieved by arranging the total reflection mirror, the first lens and the second lens.

Description

Technical Field

[0001] This utility model relates to the field of projection equipment technology, and specifically to a two-way projection device. Background Technology

[0002] Current teaching projectors generally adopt a single-lens, unidirectional projection design, meaning they only project images onto the screen in the direction of the students. This traditional structure reveals significant drawbacks in practical teaching applications: when teachers adopt a standard teaching posture facing the students, they cannot directly observe the projected content. According to research data from the education department, teachers need to turn around to check the projected image an average of 12-15 times during a 45-minute class, with each turn taking approximately 3-5 seconds, accumulating 1-1.5 minutes of effective teaching time lost. Frequent turning not only disrupts the continuity of teaching and causes a disordered pace of knowledge explanation, but also leads to chronic strain on the cervical and lumbar spine. According to statistics from educational and medical institutions, teachers who use traditional projection equipment for extended periods have a 37% higher incidence of cervical spine diseases than the general population.

[0003] Furthermore, modern teaching emphasizes the expansion and interaction of knowledge, requiring teachers to flexibly adjust their explanations based on feedback from the classroom. However, existing projection methods force teachers to interrupt eye contact with students when expanding on knowledge points, frequently turning around to check the content of PPT slides, the progress of images and text, and the position of blackboard writing. This greatly limits the efficiency of classroom interaction, especially in emerging scenarios such as remote teaching and blended learning, where this inconvenience is even more pronounced and seriously affects teaching effectiveness. Therefore, there is an urgent need for an innovative device that can achieve two-way projection to meet the comprehensive needs of modern teaching for efficiency, comfort, and interactivity. Utility Model Content

[0004] Based on the above description, this utility model provides a two-way projection device to solve the problem that traditional projectors require teachers to frequently turn their heads during teaching, resulting in greater spinal burden and reduced teaching efficiency.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a two-way projection device, comprising: a dual-lens projector and a beam splitting mechanism;

[0006] The dual-lens projector is internally equipped with a beam splitting mechanism and a light-emitting mechanism. The dual-lens projector includes a first lens and a second lens facing opposite directions. The beam splitting mechanism is located between the first lens and the second lens and is located on the optical path of the light-emitting mechanism.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the dual-lens projector includes a projector housing, with a first lens and a second lens respectively disposed on both sides of the outer surface of the projector housing, and the first lens and the second lens extending into the interior of the projector housing.

[0009] Furthermore, the first and second lenses are preferably identical lenses, and they are oriented in opposite directions.

[0010] Furthermore, the light-emitting mechanism includes an LED matrix light source and an LCE liquid crystal screen disposed inside the projector housing. The direction of the LED matrix light source toward the LCE liquid crystal screen is perpendicular to the direction of the axis of the second lens and the first lens. The direction of the LED matrix light source toward the LCE liquid crystal screen is from C to D.

[0011] Furthermore, the beam splitting mechanism includes a beam splitter and a total reflection mirror. Inside the projector housing, an LED matrix light source, an LCE liquid crystal screen, a beam splitter, and a total reflection mirror are arranged sequentially along the C to D direction. The total reflection mirror has a 45-degree angle with the axis of the first lens.

[0012] Furthermore, the beam splitter includes a first right-angled prism and a second right-angled prism, the two first right-angled prisms and the second right-angled prism form a cube, and a beam-splitting diaphragm is disposed between the first right-angled prism and the second right-angled prism, the beam-splitting diaphragm having an angle of 45 degrees with the axis of the second lens.

[0013] Furthermore, the beam splitter and the total reflection mirror are symmetrically distributed in a direction perpendicular to CD, with the reflective surface of the beam splitter facing one side of the second lens and the reflective surface of the total reflection mirror facing one side of the first lens.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0015] 1. This utility model sets up a dual-lens projector and a beam splitting mechanism, etc. Through the cooperation between the beam splitting mechanism and the dual-lens projector, the LED matrix light source and the LCE LCD screen work together to project the image. The projected light shines on the beam splitter. At this time, part of the light is reflected out along the direction towards the second lens, and the remaining part of the light shines towards the total reflection mirror, thus achieving the beam splitting effect.

[0016] 2. By setting up the total reflection mirror, lens one, and lens two, the effect of refracting light rays shining towards the total reflection mirror is achieved. The refracted light rays are then projected out from one of the lenses, thus achieving the effect of simultaneously projecting the same image from both lens one and lens two. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a two-way projection device provided in an embodiment of this utility model;

[0018] Figure 2 for Figure 1 Internal structure diagram;

[0019] Figure 3 This is a schematic diagram of the projection device in use according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram illustrating the usage of a traditional projector in the existing technology.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Projector housing; 2. Lens 1; 3. Lens 2; 4. LED matrix light source; 5. LCE LCD screen; 6. Beam splitter; 61. First right-angle prism; 62. Beam splitter; 63. Second right-angle prism; 7. Total reflection mirror. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0026] In traditional teaching settings, projectors, as a common display tool, typically project images in only one direction. This unidirectional projection method has certain limitations. For example, in a classroom, teachers often need to frequently turn around to check the content projected onto the blackboard or screen in order to interact and explain with students. This frequent movement not only affects the continuity of teaching but may also lead to less smooth communication between teachers and students. To solve this problem, this utility model proposes a bidirectional projection device that can project approximately the same image simultaneously in two opposite directions, thereby greatly improving teaching efficiency and interactivity. It is described below:

[0027] Please see Figure 1 and Figure 2 A two-way projection device includes: a dual-lens projector and a beam splitting mechanism;

[0028] The dual-lens projector has a beam splitting mechanism and a light-emitting mechanism inside. The dual-lens projector includes a first lens 2 and a second lens 3 facing opposite directions. The beam splitting mechanism is located between the first lens 2 and the second lens 3 and is located on the path of the light-emitting mechanism.

[0029] The dual-lens projector includes a projector housing 1. Lens 2 and lens 3 are respectively provided on both sides of the outer surface of the projector housing 1. Lens 2 and lens 3 extend into the interior of the projector housing 1. Lens 2 and lens 3 are preferably identical lenses and face opposite directions.

[0030] Specifically, the dual-lens projector is one of the core components of this device, cleverly integrating a beam-splitting mechanism and a light-emitting mechanism to achieve bidirectional projection. The projector's casing (projector casing 1) is a robust and well-sealed structure used to protect the internal optical and electronic components, while providing stable support for the entire device. On the outer surface of the casing, lens 2 and lens 3 are respectively located on both sides. These two lenses face completely opposite directions, allowing images to be projected onto two different projection screens.

[0031] To ensure the quality and consistency of the projected images, lenses 1 and 2 are made of identical lenses. This ensures that the two lenses have the same optical parameters, such as focal length, aperture size, and light transmittance, so that the images projected from the two lenses are basically consistent in terms of size, sharpness, and color.

[0032] The light-emitting mechanism includes an LED matrix light source 4 and an LCE liquid crystal screen 5 disposed inside the projector housing 1. The direction of the LED matrix light source 4 toward the LCE liquid crystal screen 5 is perpendicular to the direction of the axis of lens 2 3 and lens 1 2. The direction of the LED matrix light source 4 toward the LCE liquid crystal screen 5 is from C to D.

[0033] Specifically, the light-emitting mechanism is the key component for generating image light. Located inside the projector housing 1, it provides the light source for the projected image. The LED matrix light source 4 is a high-efficiency light-emitting element composed of multiple LED beads, capable of emitting uniform and bright light. Under the control of the LED matrix light source 4, this light shines onto the LCE LCD screen 5 in a specific direction and intensity. The LCE LCD screen 5 then modulates the light, controlling the transmittance of each pixel according to the input image signal, thereby forming the desired image on the LCD screen.

[0034] The direction of the LED matrix light source 4 toward the LCE LCD screen 5 is perpendicular to the axis of lens 2 and lens 3. Specifically, the light shines from the C to D direction. This perpendicular layout allows the light to pass through the LCE LCD screen 5 and then strike the subsequent beam-splitting mechanism at a suitable angle, providing a good light path for achieving bidirectional projection.

[0035] Based on the above, the projector housing 1, lens, LED matrix light source 4 and LCE LCD screen 5 are the existing structure of the projector. The LED matrix light source 4 emits light when powered on and generates images through the LCE LCD screen 5. The generated light shines on the beam splitting mechanism along the direction of CD.

[0036] The beam splitting mechanism includes a beam splitter 6 and a total reflection mirror 7. Inside the projector housing 1, along the direction from C to D, are arranged an LED matrix light source 4, an LCE liquid crystal screen 5, a beam splitter 6, and a total reflection mirror 7. The total reflection mirror 7 has a 45-degree angle between it and the axis of the lens 2. The beam splitter 6 includes a first right-angled prism 61 and a second right-angled prism 63. The two first right-angled prisms 61 and the second right-angled prisms 63 form a cube. A beam splitting diaphragm 62 is arranged between the first right-angled prism 61 and the second right-angled prism 63. The beam splitting diaphragm 62 has a 45-degree angle between it and the axis of the lens 3.

[0037] Specifically, the beam splitter is a key component for achieving bidirectional projection. It is located between lens 1 (2) and lens 2 (3) and is situated along the optical path of the light-emitting mechanism. The main function of the beam splitter is to split the image light generated by the light-emitting mechanism into two beams, which are then projected onto the directions of the two lenses respectively, thereby achieving bidirectional projection. This beam splitter includes a beam splitter (6) and a total reflection mirror (7), which are arranged sequentially from C to D inside the projector housing (1). Together with the LED matrix light source (4), the LCE liquid crystal screen (5), and other components, they form a complete optical path system.

[0038] The beam splitter 62 and the total reflection mirror 7 are symmetrically distributed in a direction perpendicular to CD. The reflecting surface of the beam splitter 62 faces the side of lens 2 3, and the reflecting surface of the total reflection mirror 7 faces the side of lens 1 2.

[0039] The beam splitter 6 is one of the core components of the beam-splitting mechanism. It consists of two right-angled prisms: a first right-angled prism 61 and a second right-angled prism 63. These two right-angled prisms are identical in structure and size, and they are tightly joined together to form a cube shape. Between the two prisms, a special beam-splitting diaphragm 62 is placed, which is crucial for achieving the beam-splitting function. The beam-splitting diaphragm 62 has a 45-degree angle with the axis of the lens 3. This specific angle setting allows light to be split into two beams according to a certain ratio when it shines on the beam-splitting diaphragm 62. One beam penetrates the beam-splitting diaphragm 62, while the other beam is reflected by the beam-splitting diaphragm 62. Based on the above, the beam splitter 6 (preferably a beam splitter with a 50:50 splitting ratio) achieves the effect of beam splitting. When the image light generated by the LED matrix light source 4 and the LCE LCD screen 5 interacts and shines on the surface of the beam splitter 6, part of the light penetrates the beam splitting film 62 and shines towards the total reflection mirror 7. The remaining light is reflected towards the lens 3 under the action of the beam splitting film 62. The angle between the reflected light and the light shining on the surface of the beam splitter 6 is 90 degrees, and the reflected light is parallel to the axis of the lens 3. The reflected light is projected from the lens 3 onto the projection screen A to form image one. The light shining on the surface of the total reflection mirror 7 is reflected towards the lens 2. The angle between the reflected light and the light shining on the surface of the total reflection mirror 7 is 90 degrees, and the reflected light is parallel to the axis of the lens 2. The reflected light is projected from the lens 2 onto the projection screen B to form image two. At this time, image one and image two are basically the same, although there may be slight differences, but they still meet the requirements for teaching use.

[0040] Specifically, the total internal reflection mirror 7 is another important component of the beam splitting mechanism. It is located behind the beam splitter 6, forming a 45-degree angle with the axis of lens 1. The function of the total internal reflection mirror 7 is to completely reflect the light that strikes its surface, allowing the light to be projected onto lens 2 in a predetermined direction. The beam splitter 62 and the total internal reflection mirror 7 are symmetrically distributed in a direction perpendicular to CD. This symmetrical layout allows the light, after passing through the beam splitter 6 and the total internal reflection mirror 7, to be projected in two different directions, thus achieving a bidirectional projection effect. The reflective surface of the beam splitter 62 faces the side of lens 2 3, while the reflective surface of the total internal reflection mirror 7 faces the side of lens 2. This orientation ensures that the light is reflected and projected along the correct path.

[0041] In summary, when the internal components of the projector work together to generate image light, this light sequentially illuminates the surfaces of the beam splitter 6 and the total reflection mirror 7. The beam splitter 6 splits the light into two beams. One beam is projected from lens 2 3 and projects image one onto the projection screen A. The other beam illuminates the surface of the total reflection mirror 7 and is projected from lens 1 2, projecting image two onto the projector B. This achieves the projection of approximately the same image from different directions, allowing teachers and students to see the PPT content simultaneously when facing each other. This facilitates the teacher's presentation and avoids the need for frequent turning around.

[0042] To further explain the bidirectional projection device proposed in this embodiment of the present invention, the implementation steps for achieving bidirectional projection are now described below:

[0043] First, the LED matrix light source 4 begins to emit light after being powered on, producing uniform and bright light. Under the control of the LED matrix light source 4, this light shines onto the LCE LCD screen 5 in a specific direction. The LCE LCD screen 5 precisely controls the transmittance of each pixel based on the input image signal, thereby forming the desired image on the LCD screen. The formed image light shines along the C to D direction onto the beam-splitting mechanism, ready for the next beam-splitting operation.

[0044] When the image light shines on the surface of the beam splitter 6, the beam splitter 62 begins to function. Because there is a 45-degree angle between the beam splitter 62 and the axis of the second lens 3, the light rays are split into two beams according to a certain ratio when they hit the beam splitter 62. One portion of the light penetrates the beam splitter 62 and continues along its original path towards the total reflection mirror 7; while the other portion of the light is reflected by the beam splitter 62, forming a 90-degree angle with the light rays that hit the surface of the beam splitter 6, and the reflected light is parallel to the axis of the second lens 3. The reflected light is projected out from the second lens 3, forming image one on the projection screen A. Image one contains the image information generated by the light-emitting mechanism and can be clearly displayed to viewers facing the second lens 3, such as students in a classroom.

[0045] Meanwhile, the light rays penetrating the beam splitter 62 continue to illuminate the surface of the total reflection mirror 7 along the light path. There is a 45-degree angle between the total reflection mirror 7 and the axis of lens 2. After illuminating the surface of the total reflection mirror 7, the light rays are reflected according to the law of reflection. The reflected light rays form a 90-degree angle with the light rays illuminating the surface of the total reflection mirror 7, and the reflected light rays are parallel to the axis of lens 2. The reflected light rays are projected out from lens 2, forming image two on the projection screen B. Image two also contains image information generated by the light-emitting mechanism and can be clearly displayed to viewers facing the direction of lens 2, such as a teacher in a classroom.

[0046] Due to the special design and layout of the beam splitter 6 and the total reflection mirror 7, images one and two are essentially identical in content. Although minor differences may exist during actual projection, such as slight variations in light intensity or minor image distortion, these differences are acceptable for teaching purposes and will not significantly affect the teaching effect. Therefore, this two-way projection device can project approximately the same image simultaneously in two opposite directions, allowing both teachers and students to clearly see the PPT content when facing each other. This greatly improves the convenience and interactivity of teaching, avoids the need for teachers to frequently turn around to check the projected content, and thus provides a more efficient and convenient solution for teaching activities.

[0047] In summary, the innovation of this two-way projection device lies in its unique beam-splitting mechanism design and dual-lens projector structure. By cleverly utilizing the optical characteristics of the beam splitter 6 and the total reflection mirror 7, it achieves the simultaneous projection of approximately identical images in two opposite directions. This two-way projection method has significant application value in the field of education, significantly improving teaching efficiency and interactivity. Compared with traditional unidirectional projectors, this device has the following significant advantages:

[0048] 1. Improve teaching efficiency: When teachers and students are facing each other, they can see the projected content simultaneously, eliminating the need for teachers to frequently turn around to check the projection screen. This ensures the continuity and smoothness of teaching, making the teaching process more efficient.

[0049] 2. Enhanced interactivity: Two-way projection makes communication between teachers and students more natural and smooth. Teachers can better observe students' reactions and adjust teaching content and methods in a timely manner, while students can also focus more on the teaching content and actively participate in classroom interaction.

[0050] 3. Compact and stable structure: The dual-lens projector and beam splitting mechanism of this device are compactly designed, and the layout of each component is reasonable. It can realize the function of bidirectional projection in a limited space, while ensuring the stability and reliability of the device, making it suitable for use in various teaching environments.

[0051] 4. High image quality: By selecting high-quality optical components and precise optical design, this device can project clear, bright and color-accurate images, meeting the high requirements for image quality in teaching.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bidirectional projection device, characterized by, The utility model relates to a double-lens projector and a light splitting mechanism. The double-lens projector comprises lens one (2) and lens two (3) facing opposite directions, and the light splitting mechanism is located between lens one (2) and lens two (3) and on the light path of the light emitting mechanism. The double-lens projector comprises a projector housing (1), and lens one (2) and lens two (3) are arranged on the outer surface of the projector housing (1) on both sides, respectively, and extend into the interior of the projector housing (1).

2. The bidirectional projection apparatus according to claim 1, wherein Lens one (2) and lens two (3) are preferably identical lenses and face opposite directions.

3. The bidirectional projection apparatus according to claim 2, wherein The light emitting mechanism comprises an LED matrix light source (4) and an LCE liquid crystal screen (5) arranged in the interior of the projector housing (1), and the direction of the LED matrix light source (4) towards the LCE liquid crystal screen (5) is perpendicular to the axis direction of lens two (3) and lens one (2), and the direction of the LED matrix light source (4) towards the LCE liquid crystal screen (5) is the direction of C to D.

4. The bidirectional projection apparatus according to claim 2, wherein The light splitting mechanism comprises a light splitting mirror (6) and a total reflection mirror (7), and the interior of the projector housing (1) is sequentially provided with the LED matrix light source (4), the LCE liquid crystal screen (5), the light splitting mirror (6), and the total reflection mirror (7) in the direction of C to D, and the total reflection mirror (7) and the axis of lens one (2) form an included angle of 45 degrees.

5. The bidirectional projection apparatus according to claim 2, wherein The light splitting mirror (6) comprises a first right-angle triangular prism (61) and a second right-angle triangular prism (63), and the two first right-angle triangular prisms (61) and the second right-angle triangular prism (63) form a cube, a beam splitting film (62) is arranged between the first right-angle triangular prism (61) and the second right-angle triangular prism (63), and the beam splitting film (62) and the axis of lens two (3) form an included angle of 45 degrees.

6. The bidirectional projection apparatus according to claim 5, wherein The beam splitting film (62) and the total reflection mirror (7) are symmetrically distributed in a direction perpendicular to C-D, the reflection surface of the beam splitting film (62) faces one side of lens two (3), and the reflection surface of the total reflection mirror (7) faces one side of lens one (2).

7. The bidirectional projection apparatus according to claim 6, wherein ​

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