Projection lens module

Abstract

The present invention provides a projection lens module, which includes a lens assembly, a reflector, a housing, a shading structure, a fan and an air guide. The lens assembly has an optical axis. The reflector is arranged on the optical axis of the lens assembly to reflect the light beam transmitted by the lens assembly. The reflector includes opposite reflective surfaces and a backlight surface. The housing covers the reflector and includes a first part and a second part. The second part includes an air inlet and an air outlet, the first part and the reflective surface of the reflector together define a closed space, and the second part and at least a part of the backlight surface of the reflector together define an air guide space. The shading structure extends from the housing and overlaps with the air outlet in the direction of the optical axis. The fan is arranged outside the housing. The air guide connects the fan and the air inlet of the housing, guides the air blown out by the fan to at least a part of the backlight surface, and then leaves through the air outlet. The projection lens module proposed by the present invention can improve the quality of the image.

Description

Technical Field

[0001] The present invention relates to a lens module, and in particular to a projection lens module. Background Art

[0002] Current optical projection devices, such as single beam projectors, are capable of projecting high-quality images, wherein the projection lens of the optical projection device is an important component that affects the image quality of the optical projection device.

[0003] The light beam from an optical projection device is projected onto a screen through a projection lens. Therefore, any imperfections in the projection lens (e.g., dust) are magnified and affect image quality. Furthermore, the projection lens reflects high-energy light beams, which can cause components within the lens (e.g., the reflector) to heat up. The temperature of different areas of the components varies depending on the amount of incident light beam, leading to uneven temperature distribution across the components, which in turn affects the image quality of the optical projection device. Therefore, preventing the projection lens from being affected by dust, uneven temperature distribution, or other imperfections is an urgent problem in the field. Summary of the Invention

[0004] The present invention provides a projection lens module. A first portion of a housing and a reflective surface of a reflector form a sealed space, thereby preventing external dust from falling between the lens assembly and the reflector. Furthermore, a second portion of the housing and a backlight surface of the reflector form an air guide space, and air blown by a fan is guided into the air guide space to cool the reflector. This evenly distributes the temperatures on the reflective surface and the backlight surface of the reflector, thereby improving the image quality of the projection lens module.

[0005] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0006] To achieve one, part, or all of the above-mentioned objectives or other objectives, a projection lens module of the present invention includes a lens assembly, a reflector, a housing, a light shielding structure, a fan, and an air guide. The lens assembly has an optical axis. The reflector is arranged on the optical axis of the lens assembly to reflect the light beam transmitted by the lens assembly, and the reflector includes opposite reflective surfaces and a backlight surface. The housing covers the reflector and includes a first portion and a second portion. The second portion includes an air inlet and an air outlet. The first portion and the reflective surface of the reflector together define a closed space, and the second portion and at least a portion of the backlight surface of the reflector together define an air guide space. The light shielding structure extends from the housing and is located next to the air outlet. The light shielding structure overlaps with the air outlet of the housing in the direction of the optical axis. The fan is arranged outside the housing. The air guide is connected to the fan and the air inlet of the housing to guide the air blown by the fan to at least a portion of the backlight surface and then out through the air outlet.

[0007] Based on the above, the present invention provides a projection lens module in which a sealed space is formed between the first portion of the housing and the reflective surface of the reflector to ensure that no dust is present between the lens assembly and the reflector. The projection lens module forms an air guide space between the second portion of the housing and the backlight surface of the reflector, directing air blown by the fan into the air guide space to cool the reflector, thereby evenly distributing the temperature of the reflector. In addition, the projection lens module uses a light-shielding structure to ensure that light leakage from the reflector does not leak out through the air outlet of the second portion. Thus, the projection lens module of the present invention has dust-proof, heat-dissipating, and light-leakage-proof functions, thereby improving the image quality of the projection lens module.

[0008] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1A FIG. 4 is a side view of a projection lens module according to an embodiment of the present invention.

[0010] Figure 1B FIG1 is a schematic diagram of the air guide member and the air flow in the air guide space of the projection lens module.

[0011] Figure 1C yes Figure 1A Exploded view of the lens module.

[0012] Figure 1D FIG. 1 is a schematic diagram of a reflective surface of a reflector according to an embodiment of the present invention.

[0013] Figure 1E yes Figure 1D Schematic diagram of the backlight side of the reflector.

[0014] Figure 1F yes Figure 1CSchematic diagram of the rear view of the projection lens module.

[0015] Figure 2 FIG. 4 is a schematic rear view of a projection lens module according to another embodiment of the present invention.

[0016] Figure 3 FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention.

[0017] Figure 4A FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention.

[0018] Figure 4B yes Figure 4A A rear view schematic diagram of a projection lens module.

[0019] Figure 5 FIG. 4 is a schematic rear view of a projection lens module according to another embodiment of the present invention.

[0020] Figure 6A FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention.

[0021] Figure 6B yes Figure 6A Schematic diagram of the rear view of the projection lens module.

[0022] Figure 7 FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention. DETAILED DESCRIPTION

[0023] The foregoing and other technical aspects, features, and functions of the present invention are clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. Directional terms (e.g., up, down, left, right, front, or back, etc.) mentioned in the following embodiments are intended solely to refer to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0024] Figure 1A FIG. 4 is a side view of a projection lens module according to an embodiment of the present invention. Figure 1B FIG1 is a schematic diagram of the air guide member and the air flow in the air guide space of the projection lens module. Figure 1C yes Figure 1A In order to clearly show the components of the projection lens module 100a and the flow of gas 200, Figure 1B The housing 130a and the air guide 160a are presented in a perspective manner, and some components are omitted and simplified.

[0025] Please also see Figures 1A to 1C The projection lens module 100a of this embodiment includes a lens assembly 110, a reflector 120 ( Figure 1B ), housing 130a, fan 150a and air guide 160a. The lens assembly 110 has an optical axis A. The housing 130a includes a first housing 130a1 and a second housing 130a2. The housing 130a covers the front end ( Figure 1B ).like Figure 1B As shown, the housing 130a further encloses the reflector 120 to secure the reflector 120 in front of the lens assembly 110. More specifically, the reflector 120 is disposed on the optical axis A of the lens assembly 110. It should be noted that the housing 130a is designed as a combination of a first housing 130a1 and a second housing 130a2 to achieve the function of enclosing the front end of the lens assembly 110 and the reflector 120. The junction of the first housing 130a1 and the second housing 130a2 can achieve a substantially mating effect, but the present invention does not particularly limit the position of the first housing 130a1 and the second housing 130a2.

[0026] The fan 150a is disposed outside the housing 130a, for example, below the lens assembly 110. In this embodiment, the air outlet of the fan 150a is disposed on a side surface 152a of the fan 150a. The fan 150a in this embodiment is, for example, a centrifugal fan, but the present invention is not limited thereto. At least one flow channel 163a ( Figure 1B ), the flow channel 163a is connected to the fan 150a and the housing 130a, so that the wind blown out by the fan 150a enters the housing 130a through the wind guide 160a. Figure 1B As shown, the fan 150 a guides external gas 200 into the flow channel 163 a of the air guide 160 a , and the gas 200 is guided into the housing 130 a through the flow channel 163 a .

[0027] The reflector 120 of this embodiment is, for example, a concave mirror, but the present invention is not limited thereto. The reflector 120 includes opposite reflective surfaces 121 and a backlight surface 124. The reflective surface 121 is used to reflect the light beam (not shown) transmitted by the lens assembly 110. In this embodiment, the reflective surface 121 of the reflector 120 is coated, for example, to reflect the light beam from the lens assembly 110. The light beam travels between the lens assembly 110 and the reflective surface 121 of the reflector 120, and the light beam is reflected by the reflective surface 121 and passes through the light-transmitting element 138 ( Figure 1C ) leaves the projection lens module 100.

[0028] Furthermore, dust or particles between the lens assembly 110 and the reflective surface 121 will affect the propagation of the light beam, thereby affecting the image quality of the projection lens module 100a. Therefore, the housing 130a of this embodiment can be divided into a first portion 131a and a second portion 132a. The first portion 131a and the reflective surface 121 together define a sealed space S1 (for example, the housing 130a is directly connected to the reflector 120), and the second portion 132a and at least a portion of the backlight surface 124 together define a wind guide space S2.

[0029] The light beam travels in the enclosed space S1, and the wind guide space S2 is connected to the wind guide member 160a. The gas 200 flows in the wind guide space S2 to exchange heat with the reflector 120. The enclosed space S1 and the wind guide space S2 do not affect each other.

[0030] In this embodiment, the enclosed space S1 is a dust-tight space. In other words, dust or particles do not fall between the lens assembly 110 and the reflective surface 121, ensuring that the light beam is not affected by external dust or the gas 200 in the air guide space S2 during its travel.

[0031] However, the present invention is not limited to this embodiment. For example, in other embodiments, the first portion 131a, the reflective surface 121, and another portion of the backlight surface 124 collectively define a sealed space S1. Furthermore, the projection lens module 100a of this embodiment may optionally include at least one airtight member 133. The airtight member 133 may be disposed, for example, between the housing 130a and the reflective mirror 120, such that the housing 130a and the reflective surface 121 collectively define the sealed space S1. In other embodiments, the housing 130a may be bonded together to form the sealed space S1 and the air guide space S2 between the reflective mirror 120 and the housing 130a.

[0032] It is worth mentioning that the first portion 131a and the second portion 132a of the present embodiment are not the first shell 130a1 and the second shell 130a2 of the shell 130a ( Figure 1A ), but rather the housing 130a (including the first housing 130a1 and the second housing 130a2) and the reflector 120 define a portion of the enclosed space S1 and a portion of the wind guide space S2.

[0033] For example, the first portion 131a includes a portion of the first shell 130a1 and a portion of the second shell 130a2 ( Figure 1A ), and the second portion 132a includes a portion of the first housing 130a1 and a portion of the second housing 130a2. In this embodiment, the housing 130a is made of opaque material to prevent light leakage from the reflector 120 from affecting the image quality of the projection lens module 100.

[0034] like Figure 1B and Figure 1C As shown, the first portion 131a of the housing 130a of this embodiment includes an opening 137, and the opening 137 is, for example, provided on the first housing 130a1 ( Figure 1C ). Light-transmitting element 138 ( Figure 1C ) is disposed in the opening 137, for example, the light-transmitting element 138 covers the opening 137 and seals it. The light beam reflected by the reflective surface 121 passes through the opening 137 and the light-transmitting element 138 and leaves the projection lens module 100a.

[0035] The second portion 132a of the housing 130a includes an air inlet 134a and an air outlet 135a. Figure 1C As shown, the air inlet 134a and the air outlet 135a of the second portion 132a are disposed in the second housing 130a2, but the present invention is not limited thereto. The air guide 160a includes a first port 161a and a second port 162a. The first port 161a is connected to the fan 150a, and the second port 162a is connected to or extends into the air inlet 134a of the housing 130a. The gas 200 flows into the air guide space S2 from the air inlet 134a and leaves the air guide space S2 from the air outlet 135a.

[0036] The positions of the opening 137 of the first portion 131a of the housing 130a and the air inlet 134a and air outlet 135a of the second portion 132a are not limited to this embodiment. For example, in other embodiments, the air outlet 135a may be disposed on the first housing 130a1.

[0037] When a light beam is incident on the reflective surface 121 of the reflector 120, the energy in the light beam causes the temperature of the reflective surface 121 and the backlight surface 124 of the reflector 120 to rise. Because the light beam is not uniformly incident on the reflector 120, but rather concentratedly incident on a certain area of ​​the reflector 120, this area absorbs more energy. In other words, the temperature distribution on the reflective surface 121 and the backlight surface 124 of the reflector 120 is not uniform.

[0038] The deformation caused by the uneven temperature distribution on the reflective surface 121 and the backlight surface 124 will affect the image quality of the projection lens module 100a. Therefore, the projection lens module 100a of this embodiment uses a fan 150a and an air guide 160a to guide the air blown by the fan 150a to at least a portion of the backlight surface 124 and then exit through the air outlet 135a, thereby cooling the reflector 120 and reducing the temperature difference between different areas on the reflective surface 121 and the backlight surface 124.

[0039] Figure 1D FIG. 1 is a schematic diagram of a reflective surface of a reflector according to an embodiment of the present invention. Figure 1E yes Figure 1D Schematic diagram of the backlight side of the reflector. Please also refer to Figure 1D and Figure 1E , on the reflecting surface 121( Figure 1D ) is a concentrated incident area 122, and the rest is a peripheral incident area 123. Figure 1E ) corresponding to the concentrated incident area 122 is the central area 125, and the remaining area is the peripheral area 126. The range of each area on the reflective surface 121 and the backlight surface 124 is represented by a dotted line. The optical axis A ( Figure 1B ) passes through the concentrated incident area 122 and the central area 125. Therefore, the temperatures of the concentrated incident area 122 and the central area 125 are relatively high, while the temperatures of the peripheral incident area 123 and the peripheral area 126 are relatively low.

[0040] Figure 1F yes Figure 1C In order to clearly show the flow of gas 200 and the alignment relationship between the air guide 160a and the backlight surface 124 of the reflector 120, Figure 1F The housing 130a and the air guide 160a are presented in a perspective manner, and some components are simplified and omitted. Figure 1F As an example, the alignment relationship between the air guide 160 a and the backlight surface 124 is described.

[0041] See also Figure 1F The second port 162a of the air guide 160a is aligned with the lower edge of the central region 125 of the backlight surface 124, directing the gas 200 toward the central region 125 in the direction of the arrow, but the present invention is not limited thereto. The second port 162a does not completely cover the central region 125, but rather partially overlaps with the central region 125, but the present invention is not limited thereto. For example, in other embodiments, the second port 162a may not overlap with the central region 125.

[0042] In addition, if Figure 1A 、 Figure 1C and Figure 1F As shown, the housing 130a of this embodiment partially surrounds the second port 162a of the air guide 160a, so that the joint between the second port 162a and the air inlet 134a is not directly exposed, but the present invention is not limited thereto.

[0043] In addition, if Figure 1F As shown, the size of the second port 162a of the air guide 160a of this embodiment is smaller than or equal to the size of the first port 161a. The sizes of the first port 161a and the second port 162a here refer to the cross-sectional area of ​​the air guide 160a perpendicular to the extension direction.

[0044] The effect of the size difference between the first port 161 a and the second port 162 a on the flow rate and convection coefficient of the gas 200 will be described in detail below.

[0045] The relationship between the flow rate, flow rate and cross-sectional area of ​​the gas 200 is shown in the following equation (1). v is the flow rate, V is the flow velocity, and A is the cross-sectional area.

[0046] Q v =VA……………………(1)

[0047] Here, flow rate Q is the flow rate of the gas 200 generated by fan 150a, and flow velocity V is the flow velocity of the gas 200 at first port 161a or second port 162a. Cross-sectional area A is positively correlated with the size of first port 161a or second port 162a. Here, flow rate Q is a fixed value. Therefore, from equation (1), it can be seen that flow velocity V of gas 200 is inversely proportional to cross-sectional area A. In other words, the smaller the cross-sectional area A, the greater the flow velocity V.

[0048] The relationship between the convection coefficient of the gas 200, the temperature difference of the area to be cooled, and the surface area is shown in the following equation (2). T is the heat, h is the convection coefficient, A is the heat dissipation surface area, and ΔT is the temperature difference.

[0049] Q T =hAΔT……………………(2)

[0050] The heat here Q T is the heat of the area to be cooled (e.g., the central area 125), the heat dissipation surface area A is the surface area of ​​the area to be cooled, the convection coefficient h is positively correlated with the convection capacity of the gas 200, and the temperature difference ΔT is the temperature difference between the solid surface (e.g., the reflective surface 124) and the surrounding environment. T When the heat dissipation surface area A is fixed, the temperature difference ΔT is negatively correlated with the convection coefficient h. In other words, to reduce the temperature difference ΔT, the convection coefficient h must be increased.

[0051] The relationship between the flow velocity V in equation (1) and the convection coefficient h in equation (2) is shown in the following equation (3).

[0052] h∝V 0.8 …………………………………(3)

[0053] As can be seen from equation (3), the flow rate V of gas 200 at the first port 161a or the second port 162a is positively correlated with the convection coefficient h. Therefore, as can be seen from equations (2) and (3), the greater the flow rate V, the higher the convection coefficient h, which in turn reduces the temperature difference ΔT and achieves a better heat dissipation effect. Therefore, as can be seen from equation (1), when the size of the second port 162a is less than or equal to the size of the first port 171a, the flow rate V of gas 200 at the second port 162a can be increased to improve the heat dissipation efficiency of gas 200.

[0054] Although it has been shown in equations (1) to (3) that the size of the first port 161a is larger than the size of the second port 162a ( Figure 1F ), the user can still configure it according to his / her needs so that the size of the first port 161a is equal to the size of the second port 162a.

[0055] Please return Figure 1D and Figure 1E , on the reflecting surface 121( Figure 1D ) of the concentrated incident area 122 and the surrounding incident area 123, a total of six points 1A-6A are taken, and on the backlight surface 124 ( Figure 1E ) in the central region 125 and the peripheral region 126. Points 1A and 2A are located in the concentrated incident region 122, and points 1B and 2B are located in the central region 125.

[0056] When the fan 150a is turned off ( Figure 1B ) and the fan 150a is turned on, the projection lens module 100a is operated and the six points 1A-6A ( Figure 1D ) and six points 1B-6B of the backlight surface 124 ( Figure 1E The measurement results of the temperatures at points 1A-6A and 1B-6B of the projection lens module 100a with the fan 150a turned off and turned on are shown in Table 1 below.

[0057] Table 1

[0058]

[0059]

[0060] The maximum difference in Table 1 is point 1A-6A ( Figure 1D ) and point 1B-6B( Figure 1E) is the difference between the highest and lowest temperatures in each of the projection lens modules. For example, when fan 150a is turned off, the maximum temperature difference on reflective surface 121 of projection lens module 100a is the difference between point 1A and point 6A (14°C), and the maximum temperature difference on backlight surface 124 is the difference between point 5B and point 4B (7°C). When fan 150a is turned on, the maximum temperature difference on reflective surface 121 of projection lens module 100a is the difference between point 1A and point 6A (4°C), and the maximum temperature difference on backlight surface 124 is the difference between point 5B and point 4B (1°C).

[0061] As can be seen, the maximum difference between points 1A-6A of the projection lens module 100a with fan 150a turned on is smaller than the maximum difference between points 1A-6A of the projection lens module with fan 150a turned off, and the maximum difference between points 1B-6B of the projection lens module 100a with fan 150a turned on is smaller than the maximum difference between points 1B-6B of the projection lens module with fan 150a turned off. In other words, the temperature distribution of the reflective surface 121 and the backlight surface 124 of the reflector 120 of the projection lens module 100a with fan 150a turned on is more uniform.

[0062] Please refer to Table 1 to compare the points 1A and 2A ( Figure 1D ) and points 1B and 2B of the central area 125 ( Figure 1E ). As shown in Table 1, the temperature difference at point 1A in the concentrated incident area 122 reached 11°C, and the temperature difference at point 1B reached 8°C. Furthermore, the temperature difference at point 1B in the central area 125 reached 8°C, and the temperature difference at point 2B reached 7°C. In other words, the temperatures of the reflective surface 121 and the backlight surface 124 of the projection lens module 100a were lower when the fan 150a was turned on.

[0063] Thus, it can be seen that the projection lens module 100 with the fan 150a turned on can reduce the temperatures of the concentrated incident area 122 and the surrounding incident area 123, and the central area 125 and the surrounding area 125. It can also further reduce the temperature difference between the concentrated incident area 122 and the surrounding incident area 123 and the central area 125 and the surrounding area 126, thereby uniformly distributing the temperature of the reflector 120. This reduces the impact of the temperature of the reflector 120 and the temperature difference between the concentrated incident area 122 and the surrounding incident area 123 and the central area 125 and the surrounding area 125 on the image quality of the projection lens module 100a.

[0064] Please return Figure 1B Since the housing 130a is provided with an air inlet 134a and an air outlet 135a, in order to prevent light from directly leaving the projection lens module 100a through the air outlet 135a and affecting the user's viewing experience, the projection lens module 100a of this embodiment further includes a light shielding structure 140a. The light shielding structure 140a is used to block light leakage at any angle.

[0065] like Figure 1B As shown, the shading structure 140a extends from the housing 130a and is located beside the air outlet 135a, overlapping with the air outlet 135a of the housing 130a in the direction of the optical axis A, so that the light beam is not directly emitted from the air outlet 138a to the outside.

[0066] The light shielding structure 140a of this embodiment includes a bent cover 142a ( Figure 1B ), but the present invention is not limited thereto. In this embodiment, the light shielding structure 140a is integrally formed with the first housing 130a1, but the present invention is not limited thereto. In other embodiments, the light shielding structure 140a and the housing 130a are separate components. In this embodiment, the air guide 160a is made of an opaque material.

[0067] See also Figure 1C The projection lens module 100a of this embodiment further includes a reflector holder 170. The reflector holder 170 is used to hold the reflector 120 and is fixed to the second housing 130a2. The reflector holder 170 includes two opposing protrusions 172, each of which is provided with a connection hole 173 and a connector 174. The second housing 130a2 includes a protrusion 139 corresponding to the connection hole 173. The protrusion 172 is fixed to the protrusion 139 via the connection hole 173 and the connector 174, thereby fixing the reflector holder 170 to the second housing 130a2.

[0068] The second housing 130a2 of this embodiment further includes a lens barrel fixing seat 136. The lens barrel fixing seat 136 is sleeved on the lens assembly 110 to fix the second housing 130a2 to the lens assembly 110 so that the lens assembly 110 and the reflector 120 do not move relative to each other.

[0069] It can be seen from this that the projection lens module 100a of this embodiment forms a sealed space S1 ( Figure 1B ) to prevent the light beam from being disturbed by external dust. The air guide space S2 formed by the second portion 132a of the housing 130a and the reflector 120, the fan 150a and the air guide 160a ( Figure 1B ) reduces the central incident area 122 and the central area 125 of the reflector 120 ( Figure 1D ) and the surrounding incident area 123 and the surrounding area 126 ( Figure 1E ) between the temperature difference. In addition, the light leakage of the reflector 120 is blocked by the housing 130a, the air guide 160a and the light shielding structure 140a made of opaque material ( Figure 1BThus, the projection lens module 100a of this embodiment has the functions of dust prevention, heat dissipation, and light leakage prevention, so as to improve the image quality of the projection lens module 100a.

[0070] The projection lens module 100a of this embodiment is suitable for a projector (not shown). The projector further includes an illumination module and an optomechanical module (light valve). The projection lens module 100a is used to transmit the light beam (eg, image beam) generated by the optomechanical module out of the projector.

[0071] The following examples illustrate alternative configurations for the fan 150a, air guide 160a, and light shielding structure 140a. It should be noted that the following examples share the same component numbers and some of the same content as the previous examples, with the same reference numbers used to represent the same or similar components, and descriptions of the same technical content will be omitted. For the omitted parts, please refer to the previous examples and will not be repeated in the following examples.

[0072] Figure 2 is a rear view schematic diagram of a projection lens module according to another embodiment of the present invention. Figure 1F and Figure 2 The projection lens module 100b of this embodiment is similar to the projection lens module 100a of the above embodiment. The difference between the two is that the air guide 160b of this embodiment further includes at least one inner partition 164b. The flow channel 163b of the air guide 160b includes a main flow channel 165b and at least one branch flow channel 166b.

[0073] like Figure 2 As shown, flow channel 163b is divided into a main flow channel 165b and two branch flow channels 166b by two inner partitions 164b. Gas 200 is designed to flow through the main flow channel 165b and the branch flow channels 166b. The main flow channel 165b faces the central area 125, while the branch flow channels 166b face the peripheral area 126. Here, the main flow channel 165b includes a third port 167b and a fourth port 168b. The third port 167b is connected to the fan 150a, and the fourth port 168b faces the central area 125. The size of the fourth port 168b is smaller than or equal to that of the third port 167b.

[0074] The branch channel 166b further includes a fifth port 169b, which is the opening of the branch channel 166b and faces at least a portion of the peripheral area 126 and the central area 125. In other words, the air guide 160b of this embodiment primarily guides the air 200 to the central area 125 and a portion of the air 200 to the peripheral area 126, thereby assisting in heat dissipation in the central area 125 and the peripheral area 126.

[0075] Figure 3Schematic diagram of the air guide member and the air flow in the air guide space of the projection lens module according to another embodiment of the present invention. Figure 1B and Figure 3 The projection lens module 100c of this embodiment is similar to the projection lens module 100a of the above embodiment. The difference between the two is that the fan 150a is located in an area other than directly below the reflector 120 and the lens assembly 110, and is in the direction of the optical axis A ( Figure 3 away from the lens assembly 110 in the left and right directions).

[0076] like Figure 3 As shown, the fan 150a of this embodiment does not overlap with the reflector 120 or the lens assembly 110 on the optical axis A, and the total length of the air guide 160c of the projection lens module 100c of this embodiment in the direction of the optical axis A is less than the total length of the air guide 160a of the projection lens module 100a in the direction of the optical axis A. Therefore, the moving path of the gas 200 in the air guide 160c is less than the moving path of the gas 200 in the air guide 160a ( Figure 1B ), thereby further reducing the energy loss of the gas 200 in the air guide 160c. Furthermore, the change in the position of the fan 150a causes the shape of the air guide 160c to change, but this does not affect the dustproof, heat dissipation, and light leakage prevention functions of the projection lens module 100c.

[0077] Figure 4A FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention. Figure 4B yes Figure 4A A rear view of the projection lens module. Figure 4A and Figure 4B The projection lens module 100d of this embodiment is similar to the projection lens module 100c of the above embodiment. The difference between the two embodiments is that the fan 150a of this embodiment is located in an area other than directly below the lens module 110 and the reflector 120. Figure 4B As shown, the fan 150a is located on the optical axis A ( Figure 4A ), more specifically, on the left side of the optical axis A and the reflector 120.

[0078] like Figure 4A As shown, the fan 150a of this embodiment is larger in the direction of the optical axis A than the fan 150a of the projection lens module 100c ( Figure 3 ) is closer to the reflector 120, so that the total length of the projection lens module 100d along the optical axis A of this embodiment is shorter than the total length of the projection lens module 100c along the optical axis A, thereby reducing the size of the projection lens module 100d along the optical axis A.

[0079] Of course, the user can configure the fan 150a and the flow channel 163d according to their needs to achieve a better heat dissipation effect without affecting the dust-proof and light-leakage-proof functions of the projection lens module 100c.

[0080] Figure 5 FIG. 4 is a schematic rear view of a projection lens module according to another embodiment of the present invention. Figure 5 Schematic diagram of the flow of gas 200 in the wind guide space S2 of the projection lens module 100e and Figure 4A Similar. See Figure 5 The projection lens module 100e of this embodiment is similar to the projection lens module 100d of the above embodiment. The difference between the two is that the fan 150a of the projection lens module 100e of this embodiment is located on the optical axis A ( Figure 4A ) and the right side of the reflector 120.

[0081] It can be seen from this that the user can place the fan 150a on the left side of the optical axis A ( Figure 4B ) or right side ( Figure 5 ), and the shapes of the air guides 160d and 160e are changed accordingly without affecting the dust-proof, heat-dissipating, and light-leakage-proof functions of the projection lens modules 100d and 100e.

[0082] Figure 6A FIG. 4 is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention. Figure 6B yes Figure 6A Schematic diagram of the rear view of the projection lens module. Please also refer to Figure 6A and Figure 6B The projection lens module 100f of this embodiment is similar to the projection lens module 100d of the above embodiment. The difference between the two is that the fan 150b of this embodiment is, for example, an axial flow fan. In other words, the air outlet of the fan 150b is located on the front face 154b of the fan 150b.

[0083] like Figure 6B As shown, the fan 150b is disposed below the reflector 120 and partially overlaps with the reflector 120, so that the length of the air guide 160f is smaller than the air guide 160d ( Figure 4B ). In other words, this embodiment can further reduce the volume of projection lens module 100f in the direction of optical axis A and in a direction perpendicular to optical axis A, and shorten the movement path of gas 200 in air guide 160f, without affecting the dustproof, heat dissipation, and light leakage prevention functions of projection lens modules 100d and 100e.

[0084] Figure 7 FIG is a schematic diagram of an air guide member and air flow in an air guide space of a projection lens module according to another embodiment of the present invention. Figure 7The projection lens module 100g of this embodiment is similar to the projection lens module 100a of the above embodiment. The difference between the two is that the light shielding structure 140b of this embodiment includes a plurality of plates 144b arranged to be tilted relative to the optical axis A (for example, tilted downward), and causes the gas 200 to flow, for example, in a direction substantially opposite to the direction in which the light beam is transmitted out of the light-transmitting element 138.

[0085] Plate 144b is disposed within housing 130b, and the gap between plate 144b and housing 130b serves as an air outlet 135b for second portion 132b of housing 130b. Thus, light shielding structure 140b in this embodiment has the same functionality as light shielding structure 140a in the aforementioned embodiment. Users can select the appropriate light shielding structure 140b based on their needs without affecting the light leakage prevention function of projection lens module 100g.

[0086] In summary, the projection lens module of the present invention utilizes the enclosed space formed by the first portion of the housing and the reflector to prevent interference with the light beam from falling dust. The air guide space, fan, and air guide member formed by the second portion of the housing and the reflector reduce the temperature difference between the central and peripheral areas of the reflector. Furthermore, light leakage from the reflector is blocked by the housing, air guide member, and light-shielding structure, which are made of opaque material. The light-shielding structure is located adjacent to the air outlet and overlaps with the housing's air outlet in the direction of the optical axis to block light leakage from the reflector at any angle. Thus, the projection lens module of this embodiment has dust-proof, heat-dissipating, and light-leakage-proof functions, thereby improving the image quality of the projection lens module.

[0087] Furthermore, the fan of this embodiment can be selectively positioned below the lens assembly or reflector, or positioned in an area other than below the lens assembly and reflector. Users can select an appropriate placement method based on their needs without affecting the dust-proofing, heat dissipation, and light-leakage-proofing functions of the projection lens module.

[0088] The above description is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the description of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention is not required to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract of the specification and the name of the invention are only used to assist in the retrieval of patent documents and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or to distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

[0089] Reference Signs List

[0090] A: Optical axis

[0091] S1: Confined space

[0092] S2: Wind guide space

[0093] 1A, 2A, 3A, 4A, 5A, 6A, 1B, 2B, 3B, 4B, 5B, 6B: points

[0094] 100a, 100b, 100c, 100d, 100e, 100f, 100g: Projection lens modules

[0095] 110: Lens assembly

[0096] 120: Reflector

[0097] 121: Reflective surface

[0098] 122, 125: Central District

[0099] 123, 126: surrounding areas

[0100] 124: Backlit side

[0101] 130a, 130b: Housing

[0102] 130a1: First shell

[0103] 130a2: Second shell

[0104] 131a, 131b: Part 1

[0105] 133: Airtight parts

[0106] 132a, 132b: Part 2

[0107] 134a: Air inlet

[0108] 135a, 135b: Air outlet

[0109] 136: Lens barrel fixing seat

[0110] 137: Opening

[0111] 138: Light-transmitting element

[0112] 139: Protrusion

[0113] 140a, 140b: light-shielding structure

[0114] 142a: Bending cover

[0115] 144b: Plate

[0116] 150a, 150b: Fan

[0117] 152a: Side

[0118] 154b: Front

[0119] 160a, 160b, 160c, 160d, 160e, 160f, 160g: Air guide

[0120] 161a: First port

[0121] 162a: Second port

[0122] 163a, 163b, 163d: flow channel

[0123] 164b: Inner partition

[0124] 165b: Main channel

[0125] 166b: Tributary

[0126] 167b: The third port

[0127] 168b: Fourth port

[0128] 169b: Fifth port

[0129] 170: Reflector mount

[0130] 172: protrusion

[0131] 173: Connection hole

[0132] 174: Connectors

[0133] 200: Gas.

Claims

1. A projection lens module, characterized in that: The projection lens module includes a lens assembly, a reflector, a housing, a light shielding structure, a fan, and an air guide, wherein: The lens assembly has an optical axis; The reflector is arranged on the optical axis of the lens assembly to reflect the light beam transmitted by the lens assembly, and the reflector includes opposite reflective surfaces and a backlight surface; The housing covers the reflector and includes a first portion and a second portion, wherein the second portion includes an air inlet and an air outlet, the first portion and the reflective surface of the reflector together define a closed space, and the second portion and at least a portion of the backlight surface of the reflector together define an air guide space; The light shielding structure extends from the housing and is located beside the air outlet, and the light shielding structure overlaps with the air outlet of the housing in the direction of the optical axis; The fan is disposed outside the housing; and The air guide member includes a first port and a second port, the first port is connected to the fan, and the second port is connected to or extends into the air inlet of the shell to guide the air blown out by the fan to at least a portion of the backlight surface and then leave through the air outlet.

2. The projection lens module according to claim 1, wherein: The size of the second port is smaller than or equal to the size of the first port.

3. The projection lens module according to claim 1, wherein: The second port faces a central area of ​​the backlight surface, and the optical axis of the lens assembly passes through the central area.

4. The projection lens module according to claim 1, wherein: The air guide member includes at least one inner partition to divide the interior of the air guide member into a main flow channel and at least one branch flow channel, the main flow channel faces the central area of ​​the backlight surface, and the at least one branch flow channel faces at least one peripheral area of ​​the backlight surface, and the optical axis of the lens assembly passes through the central area.

5. The projection lens module according to claim 4, wherein: The main channel includes a third port and a fourth port opposite to each other. The third port is connected to the fan, and the fourth port faces the central area of ​​the backlight surface. The size of the fourth port is smaller than or equal to that of the third port.

6. The projection lens module according to claim 1, wherein: The light-shielding structure includes a bent cover body which covers the air outlet and is spaced apart from the air outlet.

7. The projection lens module according to claim 1, wherein: The light-shielding structure includes a plurality of plates arranged obliquely relative to the optical axis.

8. The projection lens module according to claim 1, wherein: The fan is located below the reflector or below the lens assembly.

9. The projection lens module according to claim 1, wherein: The fan is located in a region other than directly below the reflector and the lens assembly, and is away from the lens assembly in the direction of the optical axis or is located on one side of the optical axis.

10. The projection lens module according to claim 1, wherein: The housing is made of opaque material, and the first portion of the housing includes an opening. A light-transmitting element is disposed in the opening. The light beam reflected by the reflector passes through the light-transmitting element and is transmitted out of the projection lens module.

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