CN116300288A - Projection light machine and projection equipment - Google Patents

Abstract

The application relates to a projection optical machine and projection equipment. The projection optical machine comprises a light source, a light cone, a collimating lens, a focusing lens and a lens, wherein the light cone, the collimating lens, the focusing lens and the lens are sequentially arranged along the propagation path of emergent light of the light source; the light cone is used for collecting emergent light of the light source and emitting light from the light outlet, the collimating lens is used for collimating the light, the focusing lens is used for converging the light towards the lens, and the lens is used for projecting the light; the projection optical machine satisfies the following conditional expression: [ |ra2|, |rb2| ] max is less than or equal to D/2; ra2 is the distance between the incident point of the light directly emitted from the edge of the light outlet on the lens and the optical axis, rb2 is the light reflected from the edge of the light outlet and emitted from the light cone, and D is the effective aperture of the lens. The projection light machine has the advantages of small light loss and high light utilization rate, and is favorable for improving projection brightness.

Description

Projection light machine and projection equipment

technical field

The present application relates to the technical field of projection equipment, in particular to a projection light machine and projection equipment.

Background technique

LCD projection equipment usually includes an illumination system, an LCD display system, and an imaging system. The LCD projector uses Kohler illumination to image the image displayed on the LCD onto the screen through the lens. Compared with projectors based on other principles, such as DLP projectors and LCoS projectors, LCD projectors are cheap and easy to manufacture. However, traditional LCD projectors have the problem of serious light loss, which can easily lead to a decrease in projection brightness and affect the viewing experience.

Contents of the invention

Based on this, it is necessary to provide a projection light engine and projection equipment for the problem of serious light loss in traditional LCD projectors.

A projection light machine, the projection light machine includes a light source and a light cone, a collimating lens, a focusing lens and a lens arranged in sequence along the propagation path of the light emitted by the light source;

Both ends of the light cone are respectively provided with a light inlet and a light outlet, and the light cone is used to receive the outgoing light of the light source through the light inlet and emit the light from the light outlet. The lens is used to collimate the light, the focusing lens is used to converge the light toward the lens, and the lens is used to project the light;

The projection light engine satisfies the conditional formula: [|ra2|, |rb2|]max≤D/2;

Wherein, ra2 is the distance between the incident point on the lens and the optical axis of the light directly emitted at the edge of the light outlet, and rb2 is reflected at the edge of the light outlet and exits the light cone The light rays, the distance between the incident point on the lens and the optical axis, D is the effective aperture of the lens.

The above-mentioned projection light machine, the light-collecting effect of the light cone, the collimating effect of the collimating lens and the focusing effect of the focusing lens can effectively compress the aperture of the outgoing beam of the light source, thereby effectively reducing the light height of the incident lens. Cooperating with ra2 and rb2 less than or The design equal to D/2 can make the light height of the incident lens within the effective aperture range of the lens, which is beneficial to reduce the loss of light, improve the utilization rate of light, and thus improve the projection brightness. At the same time, the reduced light height of the incident lens is also conducive to reducing the effective aperture of the lens, thereby reducing the occupied space and manufacturing cost of the lens, and is beneficial to reducing the overall size of the projection light engine.

In one of the embodiments, the light cone has a first reflective surface and a second reflective surface oppositely arranged, and in the direction along the optical axis from the light inlet to the light outlet, the first The distance between the first reflective surface and the second reflective surface increases gradually.

In one of the embodiments, the projection light machine satisfies the following conditional formula:

Wherein, r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance on the optical axis between the collimating lens and the focusing lens, and d2 is the distance between the optical axis The distance on the optical axis between the focusing lens and the lens, α is the angle between the first reflective surface and the second reflective surface, and θ is the direct emission at the edge of the light outlet The angle between the ray and the optical axis, f1 is the focal length of the collimator lens, and f2 is the focal length of the focusing lens.

In one of the embodiments, the projection light machine satisfies the following conditional formula:

Wherein, r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance on the optical axis between the collimating lens and the focusing lens, and d2 is the distance between the optical axis The distance on the optical axis between the focusing lens and the lens, α is the angle between the first reflective surface and the second reflective surface, and θ is the direct emission at the edge of the light outlet The angle between the ray and the optical axis, f1 is the focal length of the collimator lens, and f2 is the focal length of the focusing lens.

In one of the embodiments, the shape of the light emitting surface of the light source is approximately rectangular, the shape of the light inlet and the light exit of the light cone is approximately rectangular, the shape of the cross section of the light cone is approximately rectangular, and In a direction along the optical axis from the light inlet to the light outlet, the cross-sectional area of the light cone gradually increases.

In one of these embodiments,

The length of the light emitting surface of the light source is greater than or equal to 12.5 mm and less than or equal to 14 mm, and the width is greater than or equal to 6 mm and less than or equal to 7.2 mm; and/or,

The length of the light inlet is greater than or equal to 12.7mm and less than or equal to 14.5mm, and the width is greater than or equal to 6.2mm and less than or equal to 7.7mm; the length of the light outlet is greater than or equal to 92mm and less than or equal to 100mm , the width is greater than or equal to 54mm and less than or equal to 60mm; the distance on the optical axis between the light inlet and the light outlet is greater than or equal to 55mm and less than or equal to 60mm.

In one of these embodiments,

The focal length of the collimating lens is greater than or equal to 70 mm and less than or equal to 85 mm; and/or,

The focal length of the focusing lens is greater than or equal to 110 mm and less than or equal to 125 mm; and/or,

The distance on the optical axis between the light outlet and the collimating lens is less than or equal to 0.6 mm; and/or,

The distance on the optical axis between the collimating lens and the focusing lens is greater than or equal to 18 mm and less than or equal to 20 mm.

In one of the embodiments, the projection light engine further includes a polarizer, the polarizer is arranged between the collimating lens and the focusing lens, and the polarizer is used to convert light into polarized light .

In one of the embodiments, the light source includes a light emitting diode made by a eutectic process.

In one embodiment, the power density of the light source is greater than or equal to 0.82W/mm ² and less than or equal to 1.1W/mm ² .

A projection device includes the light projection machine according to any one of the above embodiments.

Description of drawings

Fig. 1 is a schematic structural diagram of a projection light machine in some embodiments.

Fig. 2 is a schematic diagram of the structure of a light cone in some embodiments.

Fig. 3 is a schematic diagram of the angles of the exiting light cones of the first ray and the second ray in some embodiments.

Fig. 4 is a schematic diagram of the light path of light exiting from the edge of the light outlet after one reflection of the light cone in some embodiments.

Fig. 5 is a schematic diagram of the light path of light exiting from the edge of the light exit after two reflections of the light cone in some embodiments.

Reference signs:

10. Projector light machine; 11. Light source; 12. Light cone; 121. Light inlet; 122. Light outlet; 123. First reflective surface; 124. Second reflective surface; 125. Third reflective surface; 126. The first Four reflective surfaces; 13, collimating lens; 14, light modulation element; 15, focusing lens; 16, lens; 17, optical axis; 18, first light; 19, second light; 21, polarizer.

Detailed ways

In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

In the description of the present application, it should be understood that if any of these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", " Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application.

In addition, if these terms "first" and "second" appear, these terms are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, unless otherwise clearly specified and limited, if any terms such as "mounted", "connected", "connected" and "fixed" appear, these terms should be interpreted in a broad sense. For example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or it can be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, or it can be the internal communication of two components Or the interaction relationship between two elements, unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In this application, unless otherwise clearly specified and limited, if there is a similar description that the first feature is "on" or "under" the second feature, the meaning may be that the first and second features are in direct contact, or The first and second features are in indirect contact through an intermediary. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that, if an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions are used for purposes of illustration only and are not intended to be exclusive implementation.

Referring to Fig. 1, Fig. 1 shows a schematic structural diagram of a projection light machine 10 in an embodiment of the present application. The projection light machine 10 provided by the present application can be used in projection equipment such as a projector, and the projection equipment can be configured with a projection screen. The optical machine 10 is configured to project light toward the projection screen to form images on the projection screen.

In some embodiments, the optical projection machine 10 includes a light source 11 and a light cone 12 , a collimator lens 13 , a light modulation element 14 , a focusing lens 15 and a lens 16 sequentially arranged along the light propagation path of the light source 11 . The light source 11 is used to emit light, and the light source 11 includes but not limited to light emitting elements such as light emitting diodes (LED). The light cone 12 is used to collect the outgoing light of the light source 11 and emit the light toward the collimating lens 13 . The collimating lens 13 is used for collimating the light emitted from the light cone 12 , for example, converging the diverging light beams so that the light beams roughly form parallel light. The light modulation element 14 is used to modulate the collimated light, so that the light projected by the projector 10 onto the projection screen can form a specific image or image, or improve the imaging quality of the light projected on the projection screen. The type of the light modulation element 14 is not limited, it can be designed according to the light modulation requirements of the projector 10 , and the type of the light modulation element 14 includes but not limited to a liquid crystal display (LCD). The focusing lens 15 is used for converging the light modulated by the light modulating element 14 and emitting it toward the lens 16 . The lens 16 can adjust the light and project the light onto the projection screen, so as to improve the imaging quality of the light on the projection screen.

1 and 2, in some embodiments, the two ends of the light cone 12 are provided with a light inlet 121 and a light outlet 122 respectively, the light source 11 can be correspondingly arranged at the light inlet 121, and the light outlet 122 faces the alignment A straight lens 13 is provided. In some embodiments, the shape of the light emitting surface of the light source 11 is roughly rectangular, the light inlet 121 and the light outlet 122 of the light cone 12 can be roughly rectangular, and the cross-section of the light cone 12 can also be roughly rectangular to accommodate the light source 11. and the shape of the projection screen to obtain a good imaging effect. In some embodiments, in the direction along the optical axis 17 of the projector 10 from the light inlet 121 to the light outlet 122, the cross-sectional area of the light cone 12 gradually increases to effectively collect the light from the light source 11 and The light exits toward the collimating lens 13 . In some embodiments, the inner wall of the light cone 12 has a first reflective surface 123 and a second reflective surface 124 oppositely arranged, and the first reflective surface 123 and the second reflective surface 124 can correspond to two sides of the cross section of the light cone 12 respectively long side. In the direction along the optical axis 17 from the light inlet 121 to the light outlet 122, the distance between the first reflective surface 123 and the second reflective surface 124 gradually increases, and part of the light emitted by the light source 11 can be reflected on the first reflective surface 123. And/or after one or more reflections on the second reflective surface 124 , the light is emitted from the light outlet 122 , so that the light cone 12 can collect the light emitted by the light source 11 . Certainly, another part of light emitted by the light source 11 may directly strike the collimating lens 13 without being reflected by the first reflective surface 123 and the second reflective surface 124 .

1 and 3 , it can be understood that the emitted light from the light source 11 exits from the light outlet 122 , passes through the collimating lens 13 , the light modulating element 14 and the focusing lens 15 to form a beam projected onto the lens 16 . Wherein, part of the light emitted from the edge of the light outlet 122 corresponds to the outermost beam of the beam projected on the lens 16 , and the light emitted from the edge of the light outlet 122 determines the height of the beam projected on the lens 16 . The light emitted from the light cone 12 at the edge of the light outlet 122 includes at least two parts, one part is directly emitted from the light outlet 122 without reflection at the edge of the light outlet 122, and the other part is reflected at the edge of the light outlet 122 and exits. The light emitting cone 12 is, for example, reflected at the edge of the first reflective surface 123 or the second reflective surface 124 away from the light source 11 to emit the light cone 12 . For the convenience of description, in this application, the light that is directly emitted at the edge of the light outlet 122 is called the first light 18, and the light that is reflected at the edge of the light outlet 122 is called the second light 19, as shown in FIG. 1 In the illustrated embodiment, different types of dotted lines are used to illustrate the trend of part of the first light ray 18 and the second light ray 19 . Of course, the first light 18 may also undergo one or more reflections inside the light cone 12 to reach the light outlet 122 , and then directly exit from the edge of the light outlet 122 .

In some embodiments, the light projection machine 10 satisfies the conditional formula: [|ra2|, |rb2|]max≤D/2; wherein, ra2 is the incident light on the lens 16 of the light directly emitted at the edge of the light outlet 122 The distance between the point and the optical axis 17, that is, the distance between the incident point of the first light ray 18 on the lens 16 and the optical axis 17, rb2 is the light that is reflected at the edge of the light outlet 122 and exits the light cone 12, The distance between the incident point on the lens 16 and the optical axis 17 , that is, the distance between the incident point of the second light 19 on the lens 16 and the optical axis 17 , D is the effective aperture of the lens 16 . The height of the light beam projected on the lens 16 is determined by the light from the exit light cone 12 from the light outlet 122, that is, by the first light 18 and the second light 19. Therefore, the design of the first light 18 and the second light 19 on the lens 16 The incident height is less than or equal to half of the effective aperture of the lens 16, which can effectively limit the light beam projected on the lens 16 within the effective aperture range of the lens 16, and the light beam can fully enter the lens 16 and be projected onto the projection screen by the lens 16 , so as to effectively reduce the damage of light and improve the utilization rate of light. It can be understood that, the light rays exiting the light cone 12 from other positions of the light exit 122, and the light exiting the light cone 12 from the edge of the light exit 122 at an angle different from the first light 18 and the second light 19, appear in the lens 16 The incident heights on the lens 16 are all smaller than the first light rays 18 and the second light rays 19, so the incident heights of the first light rays 18 and the second light rays 19 on the lens 16 are designed so that the light beams projected on the lens 16 are all within the 16 in the effective aperture range.

The projection light machine 10, the light collection effect of the light cone 12, the collimation effect of the collimator lens 13 and the focusing effect of the focusing lens 15 can effectively compress the aperture of the outgoing light beam of the light source 11, thereby effectively reducing the light height of the incident lens 16, Cooperating with the design that ra2 and rb2 are less than or equal to D/2, the height of the light incident on the lens 16 can be kept within the effective aperture range of the lens 16, which is beneficial to reduce the loss of light, improve the utilization rate of light, and thus increase the projection brightness. At the same time, the reduced height of light entering the lens 16 is also beneficial to reducing the effective aperture of the lens 16 , thereby reducing the occupied space and manufacturing cost of the lens 16 , and reducing the overall size of the projector 10 .

Further, referring to FIG. 1 and FIG. 3 , in some embodiments, when the first light ray 18 exits the light cone 12 from the edge of the light outlet 122 , the angle between the first light ray 18 and the optical axis 17 is 0.5α+θ ; The first light ray 18 shoots on the collimating lens 13 from the light cone 12, and the distance between the incident point on the collimating lens 13 and the optical axis 17 is called ra, and ra satisfies:

ra=r+d*tan(0.5α+θ)

Wherein, r is the distance between the edge of the light outlet 122 of the light cone 12 and the optical axis 17, that is, the distance between the exit point of the first light ray 18 at the light outlet 122 and the optical axis 17, and d is the distance between the light outlet 122 and the optical axis 17. The distance between the collimating lenses 13 in the direction of the optical axis 17, α is the angle between the first reflective surface 123 and the second reflective surface 124, that is, the section of the light cone 12 shown in Figure 1 and the first reflective surface 123 and the angle between the extended line of the side corresponding to the second reflective surface 124, θ is the angle between the first light ray 18 and the first reflective surface 123 or the second reflective surface 124 when it exits the light port 122, When the first light 18 emerges from the first reflective surface 123, θ is the angle between the first light 18 and the first reflective surface 123; when the first light 18 emerges from the second reflective surface 124, θ is the first The included angle between the light 18 and the second reflective surface 124 .

When the first light ray 18 exits from the collimating lens 13 and impinges on the focusing lens 15, the first light ray 18 satisfies the conditional formula:

ra1=r+d1*tanθa1

Wherein, θa1 is the angle between the first ray 18 and the optical axis 17 when it exits the collimator lens 13, that is, the angle between the first ray 18 and the optical axis 17 when it enters the focusing lens 15, and f1 is the angle between the collimator lens 13 The focal length, ra1 is the distance between the incident point of the first light ray 18 on the focusing lens 15 and the optical axis 17, and d1 is the distance on the optical axis 17 between the collimating lens 13 and the focusing lens 15.

When the first light ray 18 emerges from the focusing lens 15 and hits the light incident surface of the lens 16, the first light ray 18 satisfies the conditional formula:

ra2=ra1+d2*tanθa2

Wherein, θa2 is the angle between the first ray 18 and the optical axis 17 when it exits the focusing lens 15, that is, the angle between the first ray 18 and the optical axis 17 when it enters the light incident surface of the lens 16, and f2 is the focusing lens The focal length of 15, ra2 is the distance between the incident point of the first light ray 18 on the lens 16 and the optical axis 17, and d2 is the distance on the optical axis 17 between the focusing lens 15 and the incident surface of the lens 16.

From the above relationship, it can be deduced that:

In some embodiments, the light projection machine 10 satisfies the following conditional formula:

When the above conditional formula is satisfied, by designing the relationship between r, d1, d2, α, θ, f1 and f2 and the effective aperture of the lens 16, the incident point of the first light ray 18 on the lens 16 can be located at the lens 16 within the range of the effective aperture, so that the first light 18 can be effectively received by the lens 16, reducing light loss and improving light utilization. It can be understood that the first light rays 18 emitted from the first reflective surface 123 and the second reflective surface 124 are respectively located on both sides of the optical axis 17 when they enter the lens 16, wherein the definition of the light above the optical axis 17 in FIG. The ra2 of the first ray 18 is a positive value, and the ra2 value of the first ray 18 located below the optical axis 17 in FIG. 1 is defined as a negative value.

And for the second light ray 19, when the second light ray 19 exits the light cone 12 from the edge of the light outlet 122, the angle between the second light ray 19 and the optical axis 17 is 0.5α-θ; 12 is incident on the collimating lens 13, the distance between the incident point on the collimating lens 13 and the optical axis 17 is called rb, and rb satisfies:

rb=r+d*tan(0.5α-θ)

Wherein, r is the distance between the edge of the light outlet 122 of the light cone 12 and the optical axis 17, that is, the distance between the exit point of the second light ray 19 at the light outlet 122 and the optical axis 17, and d is the distance between the light outlet 122 and the optical axis 17. The distance between the collimating lenses 13 in the direction of the optical axis 17, α is the angle between the first reflective surface 123 and the second reflective surface 124, that is, the section of the light cone 12 shown in Figure 1 and the first reflective surface 123 and the angle between the extended line of the side corresponding to the second reflective surface 124, θ is the angle between the first reflective surface 123 or the second reflective surface 124 when the second light 19 exits the light port 122, When the second light ray 19 emerges from the first reflective surface 123, θ is the angle between the second light ray 19 and the first reflective surface 123; when the second light ray 19 emerges from the second reflective surface 124, θ is the second angle. The included angle between the light 19 and the second reflective surface 124 .

When the second light ray 19 exits from the collimating lens 13 and impinges on the focusing lens 15, the second light ray 19 satisfies the conditional formula:

rb1=r+d1*tanθb1

Wherein, θb1 is the angle between the second ray 19 and the optical axis 17 when it exits the collimator lens 13, that is, the angle between the second ray 19 and the optical axis 17 when it enters the focusing lens 15, and f1 is the angle between the collimator lens 13 rb1 is the distance between the incident point of the second light ray 19 on the focusing lens 15 and the optical axis 17 , and d1 is the distance on the optical axis 17 between the collimating lens 13 and the focusing lens 15 .

When the second light ray 19 exits from the focusing lens 15 and hits the light incident surface of the lens 16, the second light ray 19 satisfies the conditional formula:

rb2=rb1+d2*tanθb2

Wherein, θb2 is the angle between the second ray 19 and the optical axis 17 when it exits the focusing lens 15, that is, the angle between the second ray 19 and the optical axis 17 when it enters the light incident surface of the lens 16, and f2 is the focusing lens The focal length of 15, rb2 is the distance between the incident point of the second light 19 on the lens 16 and the optical axis 17, and d2 is the distance on the optical axis 17 between the focusing lens 15 and the incident surface of the lens 16.

From the above relationship, it can be deduced that:

In some embodiments, the light projection machine 10 satisfies the following conditional formula:

When the above conditional expression is satisfied, by designing the relationship between r, d1, d2, α, θ, f1 and f2 and the effective aperture of the lens 16, the incident point of the second light ray 19 on the lens 16 can be located at the lens 16 within the range of the effective aperture, so that the second light 19 can be effectively received by the lens 16, reducing light loss and improving light utilization. It can be understood that, when the second light rays 19 exiting from the first reflective surface 123 and the second reflective surface 124 are incident on the lens 16, they are respectively located on both sides of the optical axis 17, wherein the definition of the light above the optical axis 17 in FIG. The rb2 of the second light ray 19 is a positive value, and the rb2 value of the second light ray 19 located below the optical axis 17 in FIG. 1 is defined as a negative value.

It should be noted that, when the light inlet 121 and the light outlet 122 are both rectangular, FIG. 1 may be a line connecting the midpoints of the two long sides of the light inlet 121 of the light projector 10 and the two long sides of the light outlet 122. The cross-sectional schematic diagram of the plane where the line connecting the midpoints of . 1 and 2, the light cone 12 can also include a third reflective surface 125 and a fourth reflective surface 126 opposite to each other. corresponding to the short side. It can be understood that when the light exits from the short edge of the light exit 122, that is, exits from the edge of the third reflective surface 125 and the fourth reflective surface 126 away from the light source 11, it can also pass through the pairs of r, d1, d2, α, The design of θ, f1 and f2 makes the incident height of the light on the lens 16 within the effective aperture range of the lens 16. At this time, θ is when the light exits from the edge of the third reflective surface 125 and the fourth reflective surface 126 away from the light source 11, The specific design and derivation process of the included angle with the third reflective surface 125 or the fourth reflective surface 126 is based on the above-mentioned records, and will not be repeated here.

It can be understood that the light emitted by the light source 11 is reflected for different times in the light cone 12 and then exits the light outlet 122, and the light exits the light outlet 122 and the first reflective surface 123 or the second reflective surface 124. The angle θ is also different, and the θ value that takes place in the light cone 12 after one or two reflections is taken as an example below. Of course, the number of reflections of the light in the light cone 12 is not limited to one or two times, and can also be three times, Four times and more times. As shown in FIG. 1 and FIG. 4 , when the light is reflected once in the light cone 12 and then exits the light outlet 122, for example, when the light is reflected at the light inlet 121, that is, point A shown in FIG. 4 , the reflection at point A The path is known from the law of sines:

Wherein, x is the length of the line of the cross section of the light cone 12 corresponding to the light inlet 121, for example, it can be the width of the light inlet 121, α is the angle between the first reflective surface 123 and the second reflective surface 124, and y1 is When light is reflected from the light cone 12 once and exits at the edge of the light outlet 122 , the cross section of the light cone 12 corresponds to the length of the lines of the first reflective surface 123 or the second reflective surface 124 .

It can be seen that:

It can be seen that:

It can be seen from this that when the section of the light cone 12 corresponds to the length y of the line of the first reflective surface 123 or the second reflective surface 124 satisfies:

, the light is reflected once in the light cone 12 and then exits from the light outlet 122 . Please refer to Figure 4 again. The reflection path at point A is known from the law of sines:

It can be seen that:

It can be seen from this that when the light cone 12 satisfies:

, the light emitted by the light source 11 is emitted after a reflection in the light cone 12, and the value of θ can be obtained from the following conditional formula:

1 and 5, when the light is reflected twice in the light cone 12, it is emitted from the light outlet 122, for example, at the light inlet 121, which is the point A shown in FIG. 5, and the first reflective surface 123 or When reflection takes place at the point B place shown in Figure 5 on the second reflective surface 124, the reflection path at the point A place can be known by the law of sine:

Among them, z1 is the path length traveled by the light from point A to point B.

It can be seen that:

The reflection path at point B is known from the law of sines:

Wherein, y2 is the length of the line corresponding to the first reflective surface 123 or the second reflective surface 124 in the cross section of the light cone 12 when the light just exits from the edge of the light outlet 122 after two reflections by the light cone 12 .

It can be seen that:

It can be seen that:

It can be seen that:

It can be seen from this that when the section of the light cone 12 corresponds to the length y of the line of the first reflective surface 123 or the second reflective surface 124 satisfies:

, the light is reflected once in the light cone 12 and then exits from the light outlet 122 . Please refer to Figure 5 again, we can see that:

Wherein, θ1 is the angle between the light reflected at the point A and the plane where the light inlet 121 is located.

The reflection path at point A is known from the law of sines:

Among them, z1 is the length of the path that the light travels from point A to point B.

It can be seen that:

The reflection path at point B is known from the law of sines:

Wherein, y2 is the length of the line corresponding to the first reflective surface 123 or the second reflective surface 124 in the cross section of the light cone 12 when the light just exits from the edge of the light outlet 122 after being emitted twice in the light cone 12 . It can be seen that:

It can be seen that:

It can be seen from this that when the light cone 12 satisfies:

, the light emitted by the light source 11 is reflected twice in the light cone 12 and then emitted from the light outlet 122. The value of θ can be obtained by solving the following conditional expression:

In some embodiments, the length of the light emitting surface of the light source 11 is greater than or equal to 12.5 mm and less than or equal to 14 mm, and the width is greater than or equal to 6 mm and less than or equal to 7.2 mm. The length of the light inlet 121 is greater than or equal to 12.7mm and less than or equal to 14.5mm, and the width is greater than or equal to 6.2mm and less than or equal to 7.7mm. The length of the light outlet 122 is greater than or equal to 92mm and less than or equal to 100mm, and the width is greater than or equal to 54mm and less than or equal to 60mm. The distance between the light inlet 121 and the light outlet 122 on the optical axis 17 is greater than or equal to 55 mm and less than or equal to 60 mm. The focal length of the collimator lens 13 is greater than or equal to 70mm and less than or equal to 85mm. The focal length of the focusing lens 15 is greater than or equal to 110 mm and less than or equal to 125 mm. The distance between the light outlet 122 and the collimator lens 13 on the optical axis 17 is less than or equal to 0.6 mm. The distance between the collimating lens 13 and the focusing lens 15 on the optical axis 17 is greater than or equal to 18 mm and less than or equal to 20 mm. If the above numerical range is satisfied, the structure of the projection light machine 10 can be reasonably designed so that the structural features meet the above-mentioned embodiments, so that the outgoing light of the light source 11 passes through the light cone 12, the collimating lens 13, the light modulation element 14 and the focusing lens. After 15, the incident height on the lens 16 is within the range of the effective aperture of the lens 16, which can effectively improve the utilization rate of light.

It can be understood that the collimating lens 13 and the focusing lens 15 may include one lens with optical power, or may include multiple lenses with optical power, as long as the corresponding collimating or focusing functions can be realized. The setting of the lens 16 is also not limited, and the lens 16 can include one or more lenses with optical power to adjust the light and improve the imaging quality of the projection light machine 10. The specific setting of the lens 16 can be based on the light. Adjustment and imaging needs are designed and not limited in this application. In some embodiments, the lenses in the lens 16 , the collimating lens 13 and the focusing lens 15 are arranged coaxially, and the common axis of each lens can be understood as the optical axis 17 of the optical projection machine 10 . In some embodiments, the light source 11 can be fixedly connected to the light cone 12 by any suitable connection means such as glue, so that the light emitted by the light source 11 can be collected by the light cone 12 to the greatest extent.

In some embodiments, the light projection machine 10 may include heat insulating glass, which may be arranged between the collimating lens 13 and the light modulation element 14, and the heat insulating glass can isolate the light source 11 from the heat of the light cone 12, Avoid damage to the light modulation element 14 or other components due to excessive temperature. In some embodiments, the projection light machine 10 may further include a polarizer 21, the polarizer 21 is arranged between the collimator lens 13 and the light modulation element 14, and the polarizer 21 is used to convert light into polarized light, for example The outgoing light of the light source 11 is converted into linearly polarized light, so as to adapt to the setting of the LCD. In some embodiments, the polarizer 21 can be integrated with heat-insulating glass, for example, the polarizer 21 is made of heat-insulating glass, which is beneficial to compress the volume of the light projector 10 and improve user experience.

In some embodiments, the light source 11 includes LEDs made by eutectic process, and the power density of the LED input into the light source 11 may be greater than or equal to 0.82W/mm ² and less than or equal to 1.1W/mm ² . The use of eutectic process LEDs as the light source 11 is beneficial to increase the power density of the input light source 11, so that the light source 11 of the same area can emit light with greater intensity, thus helping to reduce the size of the light output surface of the light source 11 while meeting the lighting requirements , which in turn is beneficial to reduce the aperture of the lens 16, compress the occupied space of the projector 10, and reduce the manufacturing cost. Simultaneously, the light-emitting surface area of the light source 11 is reduced, which is also conducive to reducing the incident angle of the outgoing light of the light source 11 on the collimator lens 13 and the polarizer 21, and the incident angle of the light on the polarizer 21 is reduced, which is conducive to improving The polarization efficiency of the polarizer 21 reduces light loss on the polarizer 21 , which is beneficial to further improving the utilization rate of light and improving projection brightness. Of course, the improvement of the power density of the light source 11 is also beneficial to reduce the heat generated by the light source 11 when emitting light, to reduce the temperature of the light source 11 and the light cone 12 , and to improve the heat dissipation performance of the projector 10 .

In some embodiments, the present application also provides a projection device. The projection device includes a casing and the light projection machine 10 as described in any of the above embodiments. The light projection machine 10 is set in the casing, and the casing can be used for The mechanical structure of each component in the projection light machine 10 is installed. The projection device includes but is not limited to a projector, and the projection device can project the output light of the projection light machine 10 onto a projection screen for imaging. Using the above-mentioned projection light engine 10 in the projection device has low light loss and high light utilization rate, which is conducive to improving the brightness of projection imaging, thereby enhancing the viewing experience.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A light projection machine, characterized in that, the light projection machine comprises a light source and a light cone, a collimating lens, a focusing lens and a camera lens arranged in sequence along the propagation path of the outgoing light of the light source; Both ends of the light cone are respectively provided with a light inlet and a light outlet, and the light cone is used to receive the outgoing light of the light source through the light inlet and emit the light from the light outlet. The lens is used to collimate the light, the focusing lens is used to converge the light toward the lens, and the lens is used to project the light; The projection light engine satisfies the conditional formula: [|ra2|, |rb2|]max≤D/2; Wherein, ra2 is the distance between the incident point on the lens and the optical axis of the light directly emitted at the edge of the light outlet, and rb2 is reflected at the edge of the light outlet and exits the light cone The light rays, the distance between the incident point on the lens and the optical axis, D is the effective aperture of the lens. 2. The optical projection machine according to claim 1, characterized in that, the light cone has a first reflective surface and a second reflective surface oppositely arranged, and is directed from the light inlet along the optical axis to the In the direction of the light outlet, the distance between the first reflective surface and the second reflective surface gradually increases. 3. The projection light machine according to claim 2, wherein the projection light machine satisfies the following conditional formula:

Wherein, r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance on the optical axis between the collimating lens and the focusing lens, and d2 is the distance between the optical axis The distance on the optical axis between the focusing lens and the lens, α is the angle between the first reflective surface and the second reflective surface, and θ is the direct emission at the edge of the light outlet The angle between the ray and the optical axis, f1 is the focal length of the collimator lens, and f2 is the focal length of the focusing lens. 4. The projection light machine according to claim 2, wherein the projection light machine satisfies the following conditional formula:

Wherein, r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance on the optical axis between the collimating lens and the focusing lens, and d2 is the distance between the optical axis The distance on the optical axis between the focusing lens and the lens, α is the angle between the first reflective surface and the second reflective surface, and θ is the direct emission at the edge of the light outlet The angle between the ray and the optical axis, f1 is the focal length of the collimator lens, and f2 is the focal length of the focusing lens. 5. The optical projection machine according to claim 1, wherein the shape of the light-emitting surface of the light source is roughly rectangular, the shape of the light inlet and the light outlet of the light cone is roughly rectangular, and the shape of the light cone The shape of the cross section of the cone is roughly rectangular, and the area of the cross section of the light cone increases gradually along the direction along the optical axis from the light inlet port to the light outlet port. 6. The projection light machine according to claim 5, characterized in that, The length of the light emitting surface of the light source is greater than or equal to 12.5 mm and less than or equal to 14 mm, and the width is greater than or equal to 6 mm and less than or equal to 7.2 mm; and/or, The length of the light inlet is greater than or equal to 12.7mm and less than or equal to 14.5mm, and the width is greater than or equal to 6.2mm and less than or equal to 7.7mm; the length of the light outlet is greater than or equal to 92mm and less than or equal to 100mm , the width is greater than or equal to 54mm and less than or equal to 60mm; the distance on the optical axis between the light inlet and the light outlet is greater than or equal to 55mm and less than or equal to 60mm. 7. The projection light machine according to claim 1, characterized in that, The focal length of the collimating lens is greater than or equal to 70 mm and less than or equal to 85 mm; and/or, The focal length of the focusing lens is greater than or equal to 110 mm and less than or equal to 125 mm; and/or, The distance on the optical axis between the light outlet and the collimating lens is less than or equal to 0.6 mm; and/or, The distance on the optical axis between the collimating lens and the focusing lens is greater than or equal to 18 mm and less than or equal to 20 mm. 8. The optical projection machine according to claim 1, characterized in that, the optical projection machine further comprises a polarizer, the polarizer is arranged between the collimating lens and the focusing lens, the polarizers for converting light into polarized light; and/or, The light source includes a light emitting diode made by a eutectic process. 9 . The light projection machine according to claim 1 , wherein the power density of the light source is greater than or equal to 0.82 W/mm ² and less than or equal to 1.1 W/mm ² . 10. A projection device, characterized in that the projection device comprises the light projection machine according to any one of claims 1-9.

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