TW202202888A - Optical lens module - Google Patents

Abstract

An optical lens module is disclosed. The optical lens module includes an external lens structure, a hollow lens structure, an internal lens structure and a lens barrel. Compared with the traditional optical lens modules, the present invention has a smaller volume under the same magnification and imaging effect due to the addition of refraction in the optical path. In addition, since the lens barrel can adjust the distance between any two of the outer lens structure, the hollow lens structure and the inner lens structure, any problem caused by a diopter lens added to the light entrance of the optical lens module of the present invention, which affects the optical path, can also be solved.

Description

Optical lens module

The present invention relates to an optical lens module, in particular to an optical lens module with both reflection and refraction light paths.

For equipment that requires precision optical components, such as telescopes, electron microscopes, cameras, etc., optical lens modules are indispensable key components. As various products become thinner and lighter, the optical lens module also needs to be reduced in size accordingly. Limited by the design of the optical path, many optical lens modules with high optical focal length usually require a certain depth (the distance from the edge of the outermost lens to the imaging device, such as a CMOS sensor), so that light can pass through the lens The layers are refracted and finally imaged. As a result, it is quite difficult to further reduce the volume of the entire optical lens module in the depth direction, and even sacrifice some imaging quality in exchange.

On the other hand, conventional optical lens modules are very sensitive to optical components added to the external optical path. For example, if the optical lens module adds a filter, and it has a diopter, the optical lens module may not be able to adjust the focal length freely, resulting in poor image quality.

The purpose of the present invention is to solve the problems faced by the above two optical lens modules.

This text extracts and compiles certain features of the invention. Other features will be disclosed in subsequent paragraphs. It is intended to cover various modifications and similar arrangements within the spirit and scope of the appended claims.

The invention discloses an optical lens module, which can focus the incident image light along an optical axis to form an image, which comprises: an external lens structure formed by at least one lens and having a positive diopter, wherein the at least one lens is closest to the On the surface of the light source next to the image light source, a circular first reflective layer is formed with the optical axis as the center: a hollow lens structure is formed by at least one hollow transparent lens, and the at least one hollow transparent lens forms a hollow space, The shape of the hollow is substantially a circle, wherein, when the number of hollow transparent lenses is one, a second reflective layer is formed on all or part of the surface closest to the external lens structure; when the number of hollow transparent lenses is more than two , all or part of the surface farthest or second farthest away from the outer lens structure forms a second reflective layer; an inner lens structure, formed by at least one lens, focuses the image light from the hollow lens structure to a certain place; and a lens barrel, which fixes the outer lens structure, the hollow lens structure and the inner lens structure in its interior. The centers of the outer lens structure, the hollow lens structure, and the inner lens structure coincide with the optical axis, and incident image light rays are refracted to the second portion of the hollow lens structure through the portion of the outer lens structure that is not blocked by the first reflective layer. The second reflective layer is then reflected toward the outer lens structure and is reflected again by the first reflective layer, and the image light reflected twice passes through the hollow and is directed toward the inner lens structure.

Preferably, the outer lens structure may comprise at least one convex lens.

Preferably, the inner lens structure may comprise at least one convex lens.

Preferably, the material of the first reflective layer is gold, platinum, palladium, silver or alloys thereof, and is formed by chemical vapor deposition or physical vapor deposition.

Preferably, the material of the second reflective layer is gold, platinum, palladium, silver or alloys thereof, and is formed by chemical vapor deposition or physical vapor deposition.

According to the present invention, the length of the lens barrel can be adjusted, so that the distance between any two of the outer lens structure, the hollow lens structure and the inner lens structure can be adjusted. The area of the first reflective layer is substantially greater than or equal to the area of the hollow. The lens and the hollow transparent lens can be made of transparent plastic or glass, and are injection-molded together with part of the lens barrel or separately.

Compared with the traditional optical lens module, the present invention can have a smaller volume under the same magnification and imaging effect due to the addition of refraction to the optical path. In addition, since the lens barrel can be adjusted, the distance between any two of the outer lens structure, the hollow lens structure and the inner lens structure can be adjusted so that any lens with diopter can be added to the light incident place of the optical lens module of the present invention , the problem of affecting the optical path can also be solved.

The present invention will be described more specifically by referring to the following embodiments.

Please refer to FIG. 1 , which is a cross-sectional view of an optical lens module 1 according to the present invention. The optical lens module 1 can be used in different equipment, such as electronic telescopes, electron microscopes, cameras, etc. Its function is to transmit the incident image light (for the convenience of illustration, the image light in all the drawings is drawn with dotted lines) along the line. An optical axis 2 (dotted line in Figure 1) is focused for imaging. The device where the focus is located is usually a sensing element, such as a CMOS (Complementary Metal Oxide Semiconductor) sensor, film, etc. In this embodiment, a CMOS sensor 3 is used as an example for description.

The optical lens module 1 includes an outer lens structure 10 , a hollow lens structure 20 , an inner lens structure 30 and a lens barrel 40 . These technical requirements and their functions are described in detail below.

The outer lens structure 10 is formed of at least one lens having a positive power. In FIG. 1, although the external lens structure 10 is represented by a pattern, the pattern is actually a schematic representation of a combination, for example, an embodiment in FIG. 2b includes two lenses. The pattern of the inner lens structure 30 behaves similarly. According to the present invention, the types of lenses are not limited, and several different convex lenses and/or concave lenses can be used in combination according to the requirements of the equipment applying the optical lens module 1 to the imaging quality and characteristics. The aforementioned at least one lens forms a circular first reflective layer 11 with the optical axis 2 as the center on the surface closest to or next to the light source of the image light. According to the present invention, the shape of the edge of the lens is not limited, but it is preferably circular. The following description will also take a circular lens as an example. In practice, the outer lens structure 10 should include at least one convex lens. The position of the first reflective layer 11 is different due to the number and arrangement order of the lenses, and several embodiments are described here.

Please refer to FIG. 2a, which illustrates a central cross-section of one embodiment of the outer lens structure 10. As shown in FIG. In this embodiment, the external lens structure 10 simply includes a convex lens 12 , and the first reflective layer 11 is formed on the outer side of the convex lens 12 (equivalent to the surface closest to the light source of the image light). The image light is refracted from the two sides that are not directly incident on the first reflective layer 11 into the convex lens 12 , and is reflected by the hollow lens structure 20 (as shown in FIG. 1 ) before entering the convex lens 12 . The image light is refracted in the convex lens 12 again, and is reflected by the first reflective layer 11 and then refracted out of the convex lens 12 .

Please refer to FIG. 2b , which shows a central cross-section of another embodiment of the outer lens structure 10 . In this embodiment, the external lens structure 10 includes an upper convex lens 13 , a concave lens 14 and a lower convex lens 15 from top to bottom, and the first reflective layer 11 is formed on the outer side of the upper convex lens 13 (equivalent to the light source closest to the image light). surface). The image light rays are refracted from the upper convex lens 13 from the two sides that are not directly incident on the first reflective layer 11 , and are successively refracted by the concave lens 14 and the lower convex lens 15 to change the light path. Next, after being reflected by the hollow lens structure 20 , the image light enters the lower convex lens 15 and is refracted by the concave lens 14 and enters the upper convex lens 13 . The image light is refracted in the upper convex lens 13 again, and is reflected by the first reflective layer 11 and then refracted from the upper convex lens 13 . Then, the image light continues to be refracted by the concave lens 14 and the lower convex lens 15 to be emitted toward the hollow lens structure 20 .

Please refer to FIG. 2 c , which illustrates a central cross-section of yet another embodiment of the outer lens structure 10 . In this embodiment, the outer lens structure 10 includes a concave lens 16 and a convex lens 17 from top to bottom. The first reflective layer 11 is formed inside the concave lens 16 (equivalent to the surface of the light source next to the image light source). The image light rays are refracted from the two sides of the first reflective layer 11 that are not directly incident on the concave lens 16 , and are refracted by the convex lens 17 to change the light path. Next, after being reflected by the hollow lens structure 20 , the image light enters the convex lens 17 , and then goes to the concave lens 16 after being refracted. The image light is reflected by the first reflective layer 11 on the concave lens 16 and then enters the convex lens 17 and is finally refracted from the convex lens 17 .

The hollow lens structure 20 is formed by at least one hollow transparent lens. The hollow transparent lens can be a lens with a spherical surface or a curved surface, or even a flat mirror surface, which is characterized in that a light-transmitting through hole is formed in the center. Therefore, the cross-sections of the hollow transparent lens in the drawings only depict the hollow transparent lens parts on both sides of the through hole. The hollow lens structure 20 is made of at least one of the aforementioned hollow transparent lenses. Since the hollow transparent lenses all have through holes, the at least one hollow transparent lens also forms a hollow 28 when viewed from above the hollow lens structure 20 . According to the present invention, the shape of the hollow 28 should be substantially circular. The shape of the edge of the hollow transparent lens is not limited, but it is preferably a circle. The following description also takes a circular hollow transparent lens as an example. When the number of hollow transparent lenses is one, a second reflective layer 21 is formed on all or part of the surface closest to the outer lens structure 10; All or part of the surface is formed with a second reflective layer 21 . The position of the second reflective layer 21 is different due to the number and arrangement order of the lenses, and several embodiments are described here.

Please refer to FIG. 3a, which illustrates a central cross-section of one embodiment of the hollow lens structure 20. As shown in FIG. In this embodiment, the hollow lens structure 20 simply includes a hollow transparent lens with a concave curved surface 22 , and the second reflective layer 21 is formed on the entire upper surface of the hollow transparent lens with a concave curved surface 22 (equivalent to the surface next to the outer lens structure 10 ) . The image light from the outer lens structure 10 is directly reflected back to the outer lens structure 10 by the second reflective layer 21 .

Please refer to FIG. 3b , which illustrates a central cross-section of another embodiment of the hollow lens structure 20 . In this embodiment, the hollow lens structure 20 includes a convex-curved hollow transparent lens 23 and a concave-curved hollow transparent lens 24, and the second reflective layer 21 is formed on a part of the upper surface of the concave-curved hollow transparent lens 24 (equivalent to a distance away from the outside surface of the lens structure 10). After the image light from the external lens structure 10 is refracted by the convexly curved hollow transparent lens 23, it is reflected by the second reflective layer 21 back to the convexly curved hollow transparent lens 23, and finally refracted by the convexly curved hollow transparent lens 23 to the external lens structure 10. go.

Please refer to FIG. 3 c , which illustrates a central cross-section of yet another embodiment of the hollow lens structure 20 . In this embodiment, the hollow lens structure 20 includes a flat hollow transparent lens 25 , an upper convexly curved hollow transparent lens 26 and a lower convexly curved hollow transparent lens 27 . The second reflective layer 21 is formed on the lower convexly curved hollow transparent lens 27 . The entire lower surface (corresponding to the surface furthest away from the outer lens structure 10 ). The image light from the external lens structure 10 passes through the flat hollow transparent lens 25 , then is continuously refracted by the upper convexly curved hollow transparent lens 26 and the lower convexly curved hollow transparent lens 27 , and is reflected back by the second reflective layer 21 . The reflected image light is then refracted by the lower convexly curved hollow transparent lens 27 and the upper convexly curved hollow transparent lens 26 , and finally changes the light path and is emitted toward the external lens structure 10 .

The inner lens structure 30 is formed by at least one lens, which can focus the image light from the hollow lens structure 20 (through the hollow space 28 ) to a certain place, such as the CMOS sensor 3 . According to the present invention, the shape of the edge of the lens of the internal lens structure 30 is not limited, but is preferably circular, and the following description will also take a circular lens as an example. The lens can be a convex lens or a concave lens. The internal lens structure 30 is similar to a traditional optical lens module, and uses stacked lenses to change the optical path of the image light. The desired imaging effect can be achieved by several refractions, and there is no "reflection" light path. In practice, the inner lens structure 30 should include at least one convex lens.

The lens barrel 40 can fix the outer lens structure 10 , the hollow lens structure 20 and the inner lens structure 30 therein. The lower part of the lens barrel 40 can be connected to the position of the device applying the optical lens module 1 by connecting a lens holder 50 , thereby fixing the distance between the internal element and the CMOS sensor 3 .

In general, the centers of the outer lens structure 10 , the hollow lens structure 20 and the inner lens structure 30 should coincide with the optical axis 2 . The incident image light is refracted to the second reflective layer 21 of the hollow lens structure 20 through the portion of the outer lens structure 10 not blocked by the first reflective layer 11 , and then reflected to the outer lens structure 10 and reflected by the first reflective layer 11 again. The secondary reflected image light passes through the hollow 28 and is directed to the inner lens structure 30 . Therefore, the area of the first reflective layer 21 should be substantially larger than or equal to the area of the hollow 28 , as shown in FIG. 4 .

In terms of materials, the first reflective layer 11 can be made of gold, platinum, palladium, silver or alloys thereof, and can be deposited by chemical vapor deposition, such as atomic layer chemical vapor deposition, or physical vapor deposition, such as evaporation or sputtering. Similarly, the second reflective layer can also be made of gold, platinum, palladium, silver or alloys thereof and formed by chemical vapor deposition or physical vapor deposition.

A feature of the present invention is that the length of the lens barrel 40 can be adjusted, so that the distance between any of the outer lens structure 10, the hollow lens structure 20 and the inner lens structure 30 can be adjusted. That is, the outer lens structure 10 and the hollow lens structure 20 , the hollow lens structure 20 and the inner lens structure 30 , and the relative distance between the outer lens structure 10 and the inner lens structure 30 can be adjusted through the lens barrel 40 . The purpose of this is that if a diopter filter is installed in front of the external lens structure 10 , the optical lens module 1 can freely adjust the focal length and maintain the image quality. There are many techniques for adjusting the lens spacing, and the present invention is not limited to use any one of them.

In practice, the lenses of the outer lens structure 10 and the inner lens structure 30 and the hollow transparent lens of the hollow lens structure 20 can be made of glass or plastic, such as PC (polycarbonate) or PMMA (polymethacrylic acid). methyl ester). If transparent plastic is used as the material, the lenses and the hollow transparent lens can be injection-molded together with part of the lens barrel 40 or separately.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

1: Optical lens module 2: Optical axis 3: CMOS sensor 10: External lens structure 11: The first reflective layer 12: Convex lens 13: Upper convex lens 14: Concave lens 15: Lower convex lens 16: Concave lens 17: Convex Lens 20: Hollow lens structure 21: Second reflective layer 22: Concave curved hollow transparent lens 23: Convex curved hollow transparent lens 24: Concave curved hollow transparent lens 25: Flat hollow transparent lens 26: Convex curved hollow transparent lens 27: Downward convex curved hollow transparent lens 28: Hollow 30: Internal lens structure 40: Lens barrel 50: mirror base

1 is a cross-sectional view of an optical lens module according to the present invention, FIGS. 2 a to 2 c are cross-sectional views of different embodiments of the external lens structure of the optical lens module, and FIGS. 3 a to 3 c are the optical lens module Figure 4 is a cross-sectional view of different embodiments of the hollow lens structure of the optical lens module, and FIG. 4 is a top view of the external lens structure and the hollow lens structure of the optical lens module.

1: Optical lens module

2: Optical axis

3: CMOS sensor

10: External lens structure

11: The first reflective layer

20: Hollow lens structure

21: Second reflective layer

28: Hollow

30: Internal lens structure

40: Lens barrel

50: mirror base

Claims (10)

An optical lens module for focusing and imaging incident image light along an optical axis, comprising: An external lens structure formed by at least one lens with positive diopter, wherein the at least one lens forms a circular first reflective layer centered on the optical axis on the surface closest to or next to the light source of the image light: A hollow lens structure is formed by at least one hollow transparent lens, the at least one hollow transparent lens forms a hollow, and the shape of the hollow is substantially circular, wherein, when the number of hollow transparent lenses is one, the one closest to the outer lens All or part of the surface of the structure forms a second reflective layer; when the number of hollow transparent lenses is two or more, all or part of the surface farthest away from the outer lens structure forms a second reflective layer; an inner lens structure, formed by at least one lens, focusing the image light from the hollow lens structure to a certain location; and a lens barrel, the outer lens structure, the hollow lens structure and the inner lens structure are fixed in its interior, The centers of the outer lens structure, the hollow lens structure and the inner lens structure coincide with the optical axis, and the incident image light is refracted to the portion of the hollow lens structure through the portion of the outer lens structure that is not blocked by the first reflective layer. The second reflective layer is then reflected toward the outer lens structure and is again reflected by the first reflective layer, and the image light reflected twice passes through the hollow space and is directed to the inner lens structure. The optical lens module of claim 1, wherein the outer lens structure comprises at least one convex lens. The optical lens module of claim 1, wherein the internal lens structure includes at least one convex lens. The optical lens module according to item 1 of the claimed scope, wherein the material of the first reflective layer is gold, platinum, palladium, silver or alloys thereof. The optical lens module of claim 1, wherein the first reflective layer is formed by chemical vapor deposition or physical vapor deposition. The optical lens module according to item 1 of the claimed scope, wherein the material of the second reflective layer is gold, platinum, palladium, silver or alloys thereof. The optical lens module of claim 1, wherein the first and second reflection layers are formed by chemical vapor deposition or physical vapor deposition. The optical lens module of claim 1, wherein the length of the lens barrel can be adjusted, so that the distance between any two of the outer lens structure, the hollow lens structure and the inner lens structure can be adjusted. The optical lens module according to claim 1, wherein the area of the first reflective layer is substantially greater than or equal to the area of the hollow. The optical lens module according to item 1 of the claimed scope, wherein the lenses and the hollow transparent lens are made of transparent plastic or glass, and are injection-molded together with part of the lens barrel or separately.

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