Projection lens module

Abstract

A projection lens module includes a lens assembly, a mirror, a housing assembly and a buffer. The mirror is disposed beside the lens assembly and includes opposite reflecting surfaces and a back surface, wherein the reflecting surfaces face the lens assembly to reflect light beams passing through the lens assembly. The housing assembly covers the mirror and includes a flow channel frame, an inner surface and air inlets and outlets facing the back surface. The flow channel frame is disposed on the inner surface of the housing assembly and protrudes towards the back surface. The air inlets and outlets are located within the range framed by the flow channel frame. The buffer is clamped between the flow channel frame and the back surface. A flow channel is formed between the flow channel frame and the back surface of the mirror, and the flow channel is communicated with the air inlets and outlets. The projection lens module can improve the quality of the image.

Description

Technical Field

[0001] This invention relates to a lens module, and more particularly to a projection lens module. Background Technology

[0002] Modern optical projection devices, such as single-beam projectors, are capable of projecting high-quality images. The projection lens assembly is a crucial component affecting the image quality of an optical projection device.

[0003] In an optical projection device, the light beam passes through the projection lens assembly and is projected onto the projection screen. The high-energy light beam during projection causes the temperature of components in the projection lens (e.g., mirrors, convex lenses, concave lenses) to rise, affecting the image quality of the optical projection device. Therefore, preventing overheating and its impact on image quality is a pressing problem that needs to be solved in this field. Summary of the Invention

[0004] This invention provides a projection lens module with good heat dissipation performance.

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

[0006] To achieve one, some, or all of the above-mentioned objectives, or other objectives, the present invention provides a projection lens module, comprising a lens assembly, a reflector, a housing assembly, and a buffer. The reflector is disposed beside the lens assembly and includes an opposing reflective surface and a backlight surface, wherein the reflective surface faces the lens assembly to reflect light beams passing through the lens assembly. The housing assembly covers the reflector and includes a flow channel frame, an inner surface, and an air inlet and an air outlet facing the backlight surface. The flow channel frame is disposed on the inner surface of the housing assembly and protrudes towards the backlight surface, with the air inlet and air outlet located within the area framed by the flow channel frame. The buffer is sandwiched between the flow channel frame and the backlight surface, and a flow channel is formed between the flow channel frame and the backlight surface of the reflector, the flow channel connecting the air inlet and air outlet.

[0007] Based on the above, the housing assembly of the projection lens module of the present invention includes an air inlet and an air outlet facing the backlight surface of the reflector. A flow channel frame is disposed on the inner surface of the housing assembly and protrudes towards the backlight surface. The air inlet and air outlet are located within the area framed by the flow channel frame, thus forming a flow channel between the flow channel frame and the backlight surface of the reflector, and the flow channel connects the air inlet and air outlet. Therefore, airflow can enter the flow channel from the air inlet, flow past the backlight surface of the reflector, and exit from the air outlet to carry away the heat energy of the reflector, thereby effectively cooling it. Furthermore, the flow channel frame allows airflow to be concentrated and directed towards the heat-generating area of ​​the reflector, improving heat dissipation efficiency. In addition, the buffer member sandwiched between the flow channel frame and the backlight surface of the reflector allows other spaces within the housing assembly to be sealed away from the flow channel, preventing dust mixed with the airflow entering the flow channel from affecting the reflective effect of the reflective surface of the reflector, thereby improving image quality. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a projection lens module according to an embodiment of the present invention.

[0009] Figure 2 yes Figure 1 A schematic diagram of the upper housing of the projection lens module.

[0010] Figure 3 yes Figure 1 An exploded view of the projection lens module.

[0011] Figure 4 yes Figure 3 A schematic diagram from another perspective.

[0012] Figure 5 yes Figure 1 A cross-sectional schematic diagram of the projection lens module.

[0013] Figure 6 yes Figure 1 A schematic diagram of the back of the projection lens module, including the reflector, buffer, and reflector bracket. Detailed Implementation

[0014] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0015] Figure 1 This is a schematic diagram of a projection lens module according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic diagram of the upper housing of the projection lens module. Figure 3 yes Figure 1 An exploded view of the projection lens module. Figure 4 yes Figure 3 A schematic diagram from another perspective.

[0016] Please see Figures 1 to 4 In this embodiment, the projection lens module 100 is used, for example, in an ultra-short-throw projector, but its application is not limited thereto. The projection lens module 100 includes a lens assembly 110 and a reflector 120. Figure 4 ), housing assembly 130 and buffer 150 ( Figure 4 ).

[0017] like Figure 4 As shown, the reflector 120 in this embodiment is, for example, a concave mirror, but the type of reflector 120 is not limited thereto. The reflector 120 is disposed next to the lens assembly 110 and includes opposing reflective surfaces 122 and backlight surfaces 124. Figure 3 The reflecting surface 122 is, for example, the concave surface of a concave mirror, and the backlighting surface 124 is, for example, the convex surface of a concave mirror.

[0018] The reflective surface 122 faces the lens assembly 110 to reflect the light beam passing through the lens assembly 110. The transparent lens 138... Figure 3 The light beam reflected by the reflective surface 122 exits the projection lens module 100 through the transparent lens 138.

[0019] In addition, in this embodiment, the reflective surface 122 of the reflector 120 has a coating to reflect the light beam from the lens assembly 110.

[0020] Depend on Figure 2 and Figure 3 As shown, the housing assembly 130 covers the reflector 120. In this embodiment, the housing assembly 130 is made of an opaque material to prevent damage to the consumer's eyes when they look directly at the light leaking through.

[0021] The housing assembly 130 includes an inner surface 133, an upper housing 131, a lower housing 132, an air inlet 134, an air outlet 135, and a flow channel frame 140. Figure 4 In this embodiment, the air inlet 134, air outlet 135, and flow channel frame 140 are located in the lower housing 132 and face the backlight surface 124. In other embodiments, the air inlet 134, air outlet 135, and flow channel frame 140 may also be partially or entirely located in the upper housing 131.

[0022] In this embodiment, the upper housing 131 and the lower housing 132 are precision machined, so that after assembly, the upper housing 131 and the lower housing 132 have a certain degree of airtightness. In another embodiment, a dustproof gasket may also be provided between the upper housing 131 and the lower housing 132, or adhesive tape may be attached to the outside to enhance the airtightness between the upper housing 131 and the lower housing 132.

[0023] like Figure 4 As shown, the flow channel frame 140 is disposed on the inner surface 133 of the housing assembly 130 and protrudes toward the backlight surface 124. In this embodiment, the flow channel frame 140 and the lower housing 132 are integrally formed, for example. In other embodiments, the flow channel frame 140 and the lower housing 132 may also be two separate pieces, fixed by other means such as gluing or screwing.

[0024] The flow channel frame 140 protrudes from the inner surface 133 of the lower housing 132 and frames and surrounds the periphery of the air inlet 134 and the air outlet 135. That is, the air inlet 134 and the air outlet 135 are located within the area framed by the flow channel frame 140. The flow channel frame 140 defines the flow channel F (indicated by...). Figure 5 The flow channel frame 140 includes an arc-shaped contact surface 142 of the contact buffer 150. In this embodiment, the outline of the arc-shaped contact surface 142 is an arc surface, for example, corresponding to the outline of the corresponding part on the backlight surface 124.

[0025] Because the reflector 120 of the ultra-short throw projection lens module 100 must be adjusted in position to correspond to different lens components 110 during assembly, the gap between the backlight surface 124 of the reflector 120 and the arc-shaped contact surface 142 of the flow channel frame 140 in different projection lens modules 100 are also different.

[0026] In this embodiment, the buffer 150 is sandwiched between the flow channel frame 140 and the backlight surface 124. The buffer 150 directly contacts the arcuate contact surface 142 of the flow channel frame 140 and the backlight surface 124. The soft and flexible buffer 150 is made of materials that can be deformed and sealed, such as rubber, silicone, or foam, and an airtight barrier can be formed between the flow channel frame 140 and the backlight surface 124. Therefore, the backlight surface 124 of the reflector 120 and the arcuate contact surface 142 of the flow channel frame 140 can achieve a complete seal through the installation of the buffer 150.

[0027] Additionally, the projection lens module 100 also includes a reflector bracket 160 located within the housing assembly 130, with the reflector 120 fixed to the reflector bracket 160. The lower housing 132 includes a first fixing portion 137, and the reflector bracket 160 includes a second fixing portion 162 corresponding to the first fixing portion 137. The reflector bracket 160 is fixed to the lower housing 132 through the first fixing portion 137 and the second fixing portion 162. In this embodiment, the first fixing portion 137 and the second fixing portion 162 are fixed, for example, by screw connection, but this is not a limitation. The reflector bracket 160 also includes, for example, an adjustment wheel connected to the reflector 120 and adapted to rotate the reflector 120 to adjust its position and angle.

[0028] In this embodiment, the lower housing 132 further includes a lens barrel mounting base 136, through which the lens assembly 110 passes and is fixed, and partially extends into the housing assembly 130. For example, the lens barrel mounting base 136 is a plate with holes, through which the lens assembly 110 passes and partially extends into the housing assembly 130 (the optical axis A of the lens assembly 110 passes through the holes, for example), and is fixed to the lens assembly 110 and the lens barrel mounting base 136 by screwing. That is, the lens assembly 110 and the housing assembly 130 are assembled and fixed through the lens barrel mounting base 136. The lens barrel mounting base 136 and the lens assembly 110 can be airtight by filling with glue or setting gaskets to prevent dust from entering. In one embodiment, the lens assembly 110 includes, for example, an adapter disposed at (fixed to) the front end of the lens assembly 110, which is adapted to pass through the holes and partially extend into the housing assembly 130, and the adapter has, for example, an airtight function.

[0029] Figure 5 yes Figure 1 A cross-sectional view of the projection lens module. Please refer to [link / reference]. Figure 5 A sealed space S1 is formed between the housing assembly 130 (e.g., a portion of the upper housing 131 and the lower housing 132), the flow channel frame 140, the buffer 150, and at least a portion of the reflective surface 122 and the backlight surface 124 of the reflector 120, with the reflective surface 122 located within the sealed space S1.

[0030] An airflow space S2 is formed between the flow channel frame 140 and the backlight surface 124 of the reflector 120 (e.g., a portion of the backlight surface 124). The airflow space S2 forms a flow channel F, which connects the air inlet 134 and the air outlet 135. Airflow passes from the air inlet 134 through the flow channel F, flows over the backlight surface 124 of the reflector 120, and exits through the air outlet 135, thus cooling the reflector 120. In other embodiments, the airflow space S2 may also be formed between the housing assembly 130 (e.g., another portion of the lower housing 132), the flow channel frame 140, and a portion of the backlight surface 124 of the reflector 120.

[0031] Figure 6 yes Figure 1 A schematic diagram of the back of the projection lens module's reflector, buffer, and reflector bracket. Please also refer to... Figure 4 and Figure 6 Furthermore, when the light beam is incident on the reflective surface 122 of the reflector 120, the energy of the beam causes the temperature of the reflective surface 122 and the backlight surface 124 of the reflector 120 to rise. Since the light beam is not uniformly incident on the reflector 120, but rather concentrated on a portion of the reflector 120, this area absorbs more energy. In other words, the temperature distribution on the reflective surface 122 and the backlight surface 124 of the reflector 120 is not uniform. This uneven temperature distribution on the reflective surface 122 and the backlight surface 124 will affect the image quality of the projection lens module 100.

[0032] The backlight surface 124 is divided into a central area 126 and two surrounding areas 127 located on either side of the central area 126. For example, the area enclosed by the buffer 150 is the area of ​​the central area 126. The central area 126 is, for example, the geometric center of the reflector 120 or the lens assembly 110. Figure 5 The optical axis A passes through the area where the reflector 120 is hotter when the projection lens module 100 is operating.

[0033] like Figure 4 As shown, the position of the buffer 150 on the backlight surface 124 corresponds to the position of the flow channel frame 140 on the backlight surface 124. Therefore, the area enclosed by the arc-shaped contact surface 142 of the flow channel frame 140 is smaller than the area of ​​the backlight surface 124 of the reflector 120. The flow channel frame 140 also surrounds the air inlet 134 and the air outlet 135. Therefore, the position of the air inlet 134 also corresponds to the central area 126 of the backlight surface 124. Figure 6 The positioning of the flow channel frame 140 and the air inlet 134 allows the airflow to be concentrated on the central area 126 of the backlight surface 124 (the area with the highest temperature in the backlight surface 124) to improve heat dissipation efficiency.

[0034] In other words, in the projection lens module 100 of this embodiment, the air inlet 134 is located in the central area 126 of the backlight surface 124, which can guide airflow through the central area 126 of the backlight surface 124 to enhance the cooling of the central area 126, thereby reducing the temperature difference between different areas on the reflective surface 122 and the backlight surface 124. This design helps to improve the problem of blurred projected images due to overheating, and the reduced temperature of the reflector 120 also has the potential to further increase the product's brightness.

[0035] Furthermore, since the sealed space S1 is a dust-tight space, the light beam travels within it. Airflow moves within the flow channel F to exchange heat with the reflector 120. The sealed space S1 and the flow channel F are separated by a buffer 150 to prevent mutual interference. In other words, dust or particles do not fall between the lens assembly 110 and the reflective surface 122, ensuring that the light beam is not affected by external dust or gas in the flow channel F during its travel.

[0036] In summary, the housing assembly of the projection lens module of the present invention includes a flow channel frame, an air inlet and an air outlet facing the backlight surface of the reflector. The flow channel frame is disposed on the inner surface of the housing assembly and protrudes towards the backlight surface. The air inlet and the air outlet are located within the area framed by the flow channel frame, such that the flow channel is formed between the flow channel frame and at least a portion of the backlight surface of the reflector, and the flow channel connects the air inlet and the air outlet. Therefore, airflow can enter the flow channel from the air inlet, flow past the backlight surface of the reflector and exit from the air outlet to carry away the heat energy of the reflector, thereby effectively cooling it. In addition, the flow channel frame allows the airflow to be concentrated and blown onto the heat-generating area of ​​the reflector, improving heat dissipation efficiency. Furthermore, the design of the buffer sandwiched between the flow channel frame and the backlight surface allows other spaces within the housing assembly to be sealed away from the flow channel, preventing dust mixed in with the airflow entering the flow channel from affecting the reflective effect of the reflective surface of the reflector.

[0037] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent variations and modifications made according to the claims and description of the invention are still within the scope of this invention. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and title are merely for assisting in patent document searches and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements.

[0038] Explanation of reference numerals in the attached figures

[0039] A: Optical axis

[0040] F: Flow channel

[0041] S1: Enclosed space

[0042] S2: Airflow Guide Space

[0043] 100: Projection lens module

[0044] 110: Lens assembly

[0045] 120: Reflector

[0046] 122: Reflective surface

[0047] 124: Backlit side

[0048] 126: Central District

[0049] 127: Surrounding Area

[0050] 130: Housing assembly

[0051] 131: Upper shell

[0052] 132: Lower shell

[0053] 133: Inner surface

[0054] 134: Air Inlet

[0055] 135: Air outlet

[0056] 136: Lens tube mounting base

[0057] 137: First fixed part

[0058] 138: Clear lens

[0059] 140: Flow channel frame

[0060] 142: Arc-shaped contact surface

[0061] 150: Buffer

[0062] 160: Reflector bracket

[0063] 162: Second fixing part

Claims

1. A projection lens module, characterized in that, include: Lens assembly; A reflector, disposed next to the lens assembly, includes an opposite reflective surface and a backlight surface, wherein the reflective surface faces the lens assembly to reflect light beams passing through the lens assembly; The housing assembly covers the reflector and includes a flow channel frame, an inner surface, and an air inlet and an air outlet facing the backlight surface. The flow channel frame is disposed on the inner surface of the housing assembly and protrudes in the direction facing the backlight surface. The air inlet and the air outlet are located within the area framed by the flow channel frame. as well as A buffer element is sandwiched between the flow channel frame and the backlight surface. The flow channel is formed between the flow channel frame and the backlight surface of the reflector, and the flow channel connects the air inlet and the air outlet. A sealed space is formed between a portion of the housing assembly, the buffer, the lens assembly, and the reflector. The reflective surface is located within the sealed space, and the sealed space is not connected to the flow channel.

2. The projection lens module according to claim 1, characterized in that, The housing assembly includes an upper housing and a lower housing, with the air inlet and the air outlet located in the lower housing.

3. The projection lens module according to claim 2, characterized in that, The flow channel frame and the lower shell are integrally formed.

4. The projection lens module according to claim 2, characterized in that, The flow channel frame is fixed to the lower housing by gluing or screwing.

5. The projection lens module according to claim 2, characterized in that, The lower housing includes a lens barrel mounting base, and the lens assembly passes through the lens barrel mounting base and extends partially into the housing assembly.

6. The projection lens module according to claim 1, characterized in that, The flow channel frame includes an arc-shaped contact surface that contacts the buffer, and the area enclosed by the arc-shaped contact surface is smaller than the area of ​​the backlight surface of the reflector.

7. The projection lens module according to claim 6, characterized in that, The contour of the arc-shaped contact surface corresponds to the contour of the corresponding part on the backlight surface.

8. The projection lens module according to claim 1, characterized in that, The air inlet faces the central area of ​​the backlight surface.

9. The projection lens module according to claim 1, characterized in that, It also includes a reflector bracket located within the housing assembly, with the reflector fixed to the reflector bracket.

10. The projection lens module according to claim 9, characterized in that, The housing assembly includes a lower housing, the lower housing includes a first fixing part, and the reflector bracket includes a second fixing part corresponding to the first fixing part. The reflector bracket is fixed to the lower housing through the first fixing part and the second fixing part.

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