TWI742411B - Optical element having stray light suppression structure - Google Patents

Abstract

Am optical element having stray light suppression structure includes a main body. The main body is ring-shaped and defines an axial direction. The main body has an inner peripheral face and an outer peripheral face. The main body is adapted for being disposed in a lens mount, and the main body is connected to the inner wall of the lens mount with its outer peripheral face. Two ends of the main body along the axial direction are defined as a first end and a second end. The main body has a plurality of stray light suppression structures arranged around the axial direction at intervals. Each of the stray light suppression structure is not coplanar with the inner peripheral face of the main body. Each of the stray light suppression structures has a third end near the first end and a fourth end near the second end. An extension path of each of the stray light suppression structures doesn’t completely overlap a line defined by the third end and the fourth end.

Description

Optical element with stray light elimination structure

The present invention relates to an optical element, in particular to an optical element with a stray light elimination structure.

Generally speaking, optical devices such as lenses are composed of optical elements such as lenses, and often have elements such as spacer rings or pressure rings to fix the position of the lens. However, because not the entire lens can be used for effective imaging, and other elements will also It causes the reflection of light. When the light hits the non-optical part, it will form stray light. The stray light may affect the image quality, so try to avoid it.

In order to avoid stray light from affecting imaging, uneven structures are usually used to disperse stray light to avoid concentration of stray light. For example, as shown in patents TW I612354, TW I616697, and TW I639029, they are usually placed around the optical part of the lens or between the spacer ring. A fine concavo-convex structure is formed on the inner ring surface and other places.

However, the conventional concave-convex structure is extremely uniform in shape, such as concentric annular grooves, radial radial straight grooves, etc., and the reflection surface formed by the same direction, even has the possibility of concentrating stray light, which is effective in eliminating stray light. It needs to be strengthened.

The main purpose of the present invention is to provide an optical element with a stray light elimination structure, which can effectively eliminate the influence of stray light on imaging.

In order to achieve the above objective, the present invention provides an optical element with a stray light elimination structure, which defines an axial direction and includes a body with an inner ring surface and an outer ring surface. The opposite ends of the body along the axial direction are respectively defined Is a first ring end surface and a second ring end surface. The body is provided with a plurality of stray light elimination structures on the inner ring surface. The stray light elimination structures are arranged at intervals around the axial direction. It is in the same plane as the inner ring surface of the body, wherein each of the stray light elimination structures includes a first end connected to the first ring end surface, a second end connected to the second ring end surface, and a first end connected to the first ring end surface. A curved stray light eliminating part between the end and the second end.

In order to achieve the above-mentioned object, the present invention provides an optical element with a stray light elimination structure, which defines an axial direction and includes a body having an optical part surrounding the axial direction and a delustering part surrounding the optical part. The body is provided with a plurality of stray light elimination structures on the matting part, the stray light elimination structures are arranged at intervals around the axial direction, and the surface of each stray light elimination structure is not in the same plane as the matting part of the body, wherein each stray light elimination structure The structure includes a first end portion, a second end portion closer to the optical portion than the first end portion, and a curved stray light eliminating portion connected between the first end portion and the second end portion.

X: axial

10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10’: body

101: First ring end face

102: second ring end face

11: inner ring surface

12: Outer ring surface

13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h: stray light elimination structure

131, 131a, 131b, 131c, 131d, 131e, 131f, 131g, 131h: first end

132, 132a, 132b, 132c, 132d, 132e, 132f, 132g, 132h: second end

133, 133a, 133b, 133c, 133d, 133e, 133f, 133g, 133h: Stray light elimination part

14: Optics Department

15: Extinction Department

20: lens mount

30: Spacer ring

Figure 1 is a perspective view of the present invention.

Figure 2 is a perspective exploded view of the present invention.

Figure 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic diagram of the stray light path of the present invention.

Figure 5 is a partial perspective view of the present invention.

Fig. 6 is a partial perspective view of the second embodiment of the present invention.

Fig. 7 is a partial perspective view of the third embodiment of the present invention.

Fig. 8 is a partial perspective view of the fourth embodiment of the present invention.

Fig. 9 is a partial perspective view of the fifth embodiment of the present invention.

Fig. 10 is a partial perspective view of the sixth embodiment of the present invention.

Fig. 11 is a partial perspective view of the seventh embodiment of the present invention.

Fig. 12 is a partial perspective view of the eighth embodiment of the present invention.

Fig. 13 is a partial perspective view of the ninth embodiment of the present invention.

Fig. 14 is a front view of the tenth embodiment of the present invention.

Fig. 15 is a partial perspective view of the tenth embodiment of the present invention.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

1-13, the present invention provides an optical element with a stray light elimination structure, including a body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h (such as a pressure ring, a spacer ring 30 etc.), the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h is ring-shaped and defines an axial direction X, the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g , 10h has an inner ring surface 11 and an outer ring surface 12, the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h is provided inside a lens mount 20 and the outer ring surface 12 Connected to the inner wall of the lens mount 20, the opposite ends of the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h along the axial direction X are respectively defined as a first ring end surface 101 and a On the second ring end surface 102, the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h is provided with a plurality of stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, and the inner ring surface 11 13f, 13g, 13h, the stray light eliminating structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h are arranged at intervals around the axis X, each of the stray light eliminating structures 13, 13a, 13b, 13c The surface of, 13d, 13e, 13f, 13g, 13h is not in the same plane as the inner ring surface 11 of the body 10, and each of the stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h includes A first end portion 131, 131a, 131b, connected to the first ring end surface 101 131c, 131d, 131e, 131f, 131g, 131h, a second end 132, 132a, 132b, 132c, 132d, 132e, 132f, 132g, 132h, and a second end connected to the first end 102 Elimination of curved stray light between parts 131, 131a, 131b, 131c, 131d, 131e, 131f, 131g, 131h and the second end 132, 132a, 132b, 132c, 132d, 132e, 132f, 132g, 132h Parts 133, 133a, 133b, 133c, 133d, 133e, 133f, 133g, 133h, in this embodiment, the stray light elimination structure 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h includes at least one recess , Any radial cross section of the main body passes through at least one of the recesses, and the stray light elimination portions 133, 133a, 133b, 133c of each of the stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h , 133d, 133e, 133f, 133g, 133h does not correspond to any point of the first end 131, 131a, 131b, 131c, 131d, 131e, 131f, 131g, 131h and the second end 132, 132a, The straight lines at any point of 132b, 132c, 132d, 132e, 132f, 132g, 132h are completely coincident.

In the main embodiment of the present invention, the stray light removing portions 133, 133a, and 133b of each of the stray light removing structures 13, 13a, 13b are generally S-shaped and a concave groove, as shown in FIGS. 5 to 7; however, In other embodiments of the present invention, the stray light removing portions 133f, 133g, and 133h of each of the stray light removing structures 13f, 13g, 13h may be U-shaped grooves, as shown in FIGS. 11 to 13, preferably, each The stray light eliminating parts 133c, 133d, and 133e of the stray light eliminating structures 13c, 13d, and 13e include two sections that are connected to each other. The stray light elimination portions 133c, 133d, and 133e of 13d, 13e can be zigzag-shaped grooves, as shown in FIGS. 8 to 10, preferably, the stray light elimination structures 13f, 13g, 13h are each The portions 133f, 133g, and 133h include at least three sections intersecting each other, and any two adjacent sections have an angle, which is not equal to 180 degrees.

As for the shape of the groove, in the main embodiment of the present invention, the groove (the stray light elimination parts 133, 133c, 133f of the stray light elimination structure 13, 13c, 13f) has a narrower bottom and wider opening in the radial cross section. The trapezoid shape is as shown in Figure 5, Figure 8, Figure 11 (any two of the concave grooves form a convex rib, the radial cross section of the convex rib is also a trapezoid with a narrower top surface); other possibilities of the present invention In the embodiment, the groove (stray light extinction In addition to the stray light elimination portions 133a, 133d, and 133g of the structures 13a, 13d, and 13g), the radial cross section is inverted triangle, as shown in Figure 6, Figure 9, Figure 12 (any two concave grooves form a convex rib, the The radial cross-section of the convex rib is triangular); the radial cross-section of the bottom of the concave groove (the stray light removing parts 133b, 133e, 133h of the stray light removing structures 13b, 13e, 13h) can also be a concave arc, as shown in Figure 7 , Figure 10, Figure 13 (A convex rib is formed between any two grooves, the radial cross section of the convex rib is convex arc).

As shown in FIGS. 14 and 15, the present invention also provides an optical element with a stray light elimination structure, which includes a disc-shaped body 10' (for example, a lens), the body 10' defines an axis X, and the body 10' 10' has an optical portion 14 (actually for light to pass through for shaping) surrounding the axial direction X in the center thereof, and has an extinction portion 15 surrounding the optical portion 14 on the radially outer side of the optical portion 14, The main body 10' is provided with a plurality of stray light elimination structures 13 on the extinction portion 15. The stray light elimination structures 13 are arranged at intervals around the axial direction X, and the surface of each stray light elimination structure 13 is not the same as that of the main body 10'. The portions 15 are in the same plane, and each of the stray light elimination structures 13 includes a first end portion 131, a second end portion 132 closer to the optical portion 14 than the first end portion 131, and a second end portion 131 connected to the first end portion 131 The stray light elimination portion 133 is curved between the second end portion 132 and the stray light elimination portion 133. The straight line connecting any point of the end 132 completely coincides.

In this embodiment, the stray light eliminating portion 133 of each stray light eliminating structure 13 is generally S-shaped and a groove, and the groove (the stray light eliminating portion 133 of the stray light eliminating structure 13) has a radial cross section. A trapezoid with a narrower bottom and a wider opening. However, as mentioned above, in other possible embodiments, the stray light removing portion 133 of each stray light removing structure 13 can also be in a shape such as a ㄑ-shaped or a broken-line shape or any non-linear shape. , And the radial cross-section of the groove can be arc-shaped or inverted triangle and other shapes.

In actual use, as shown in FIG. 4, when the optical element is installed in the lens holder and imaging is actually performed, the stray light elimination part 133 of the stray light elimination structure 13 provides a lot of contact with the body. The non-parallel surface reflects the stray light, and the stray light removing portion 133 of the stray light removing structure 13 is not a straight line, that is, the inner surface of the stray light removing portion 133 of the stray light removing structure 13 is also non-planar, at least Two planes with different directions make the direction of the reflecting surface more diverse, which can further evenly scatter the stray light and avoid affecting the imaging.

In summary, the optical element provided by the present invention has a non-linear stray light elimination structure, which can provide stray light reflecting surfaces in various directions, so that stray light is reflected more dispersedly, and avoids gathering stray light to affect imaging. The effect is outstanding. , Highly progressive effect.

10: body

13: Stray light elimination structure

20: lens mount

Claims (18)

An optical element with a stray light eliminating structure, defining an axial direction, including a body, having an inner ring surface and an outer ring surface. The opposite ends of the body along the axial direction are respectively defined as a first ring end surface and a first ring end surface. The second ring end surface, the body is provided with a plurality of stray light elimination structures on the inner ring surface, the stray light elimination structures are arranged at intervals around the axial direction, and the surface of each stray light elimination structure is not the same as the inner ring surface of the body Plane, wherein each of the stray light elimination structures includes a first end connected to the end surface of the first ring, a second end connected to the end surface of the second ring, and a second end connected to the first end and the second end The stray light elimination part is occasionally curved. The optical element with a stray light elimination structure as described in claim 1, wherein the stray light elimination portion of each stray light elimination structure is generally U-shaped. The optical element having a stray light removing structure as described in claim 1, wherein the stray light removing portion of each stray light removing structure is generally S-shaped. The optical element having a stray light removing structure as described in claim 1, wherein the stray light removing portion of each stray light removing structure is almost in the shape of a broken line. The optical element having a stray light eliminating structure according to claim 2, wherein the stray light eliminating portion of each of the stray light eliminating structure includes two sections adjacent to each other, and the two sections sandwich an angle, and the angle is not equal to 180 Spend. The optical element having a stray light eliminating structure according to claim 4, wherein the stray light eliminating portion of each stray light eliminating structure includes at least three sections intersecting each other, and any two adjacent sections sandwich an angle , The angle is not equal to 180 degrees. The optical element with a stray light elimination structure according to any one of claims 1 to 6, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the bottom of the groove is approximately Concave arc shape. The optical element with a stray light elimination structure according to any one of claims 1 to 6, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the groove is an inverted triangle. The optical element with a stray light elimination structure according to any one of claims 1 to 6, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the groove has a narrow bottom A trapezoid with a wider opening. An optical element with a stray light eliminating structure, defining an axial direction, and comprising a main body, the main body having an optical part surrounding the axial direction and an extinction part surrounding the optical part, the main body is provided with a plurality of impurities in the extinction part Light elimination structure, the stray light elimination structures are arranged at intervals around the axial direction, and the surface of each stray light elimination structure is not in the same plane as the extinction part of the main body, wherein each stray light elimination structure includes a first end and a The second end of the optical part is closer to the first end than the first end, and a stray light eliminating part connected between the first end and the second end and in a curved shape. The optical element with a stray light elimination structure as described in claim 10, wherein the stray light elimination portion of each stray light elimination structure is generally U-shaped. According to claim 10, the optical element having a stray light removing structure, wherein the stray light removing portion of each stray light removing structure is generally S-shaped. According to claim 10, the optical element having a stray light removing structure, wherein the stray light removing portion of each stray light removing structure is almost in the shape of a broken line. The optical element having a stray light elimination structure according to claim 11, wherein the stray light elimination portion of each of the stray light elimination structure includes two sections adjacent to each other, the two sections sandwich an angle, and the angle is not equal to 180 Spend. The optical element having a stray light eliminating structure according to claim 13, wherein the stray light eliminating portion of each stray light eliminating structure includes at least three sections intersecting each other, and any two adjacent sections sandwich an angle , The angle is not equal to 180 degrees. The optical element having a stray light elimination structure according to any one of claims 10 to 15, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the bottom of the groove is approximately Concave arc shape. The optical element with a stray light elimination structure according to any one of claims 10 to 15, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the groove is an inverted triangle. The optical element with a stray light elimination structure according to any one of claims 10 to 15, wherein the stray light elimination portion of each stray light elimination structure is a groove, and the radial cross section of the groove has a narrow bottom A trapezoid with a wider opening.

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