TW202105030A - 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 uneven 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.

To achieve the above objective, the present invention provides an optical element with a stray light elimination structure, comprising a body, the body is ring-shaped and defines an axial direction, the body has an inner ring surface and an outer ring surface, and the body is provided with Inside a lens mount, the outer ring surface is connected to the inner wall of the lens mount. The opposite ends of the body along the axial direction are defined as a first end and a second end, respectively. The body is on the inner ring The surface is provided with a plurality of stray light elimination structures, the stray light elimination structures are arranged at intervals around the axial direction, the surface of each stray light elimination structure is not in the same plane as the inner ring surface of the body, and each stray light elimination structure is closer to The first end has a third end and a fourth end closer to the second end, and the extension path of each stray light elimination structure does not completely coincide with the connection line between the third end and the fourth end.

In order to achieve the above-mentioned object, the present invention provides an optical element with a stray light elimination structure, comprising a body defining an axial direction, the body having an optical part at the center, and a radially outer side of the optical part An extinction part surrounding the optical part, the main body is provided with a plurality of stray light elimination structures on the extinction 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 extinct with the main body The stray light eliminating structure has a third end closer to the optical portion and a fourth end farther away from the optical portion. The extension path of each stray light eliminating structure is different from the third end and the third end. The connections at the fourth end are completely overlapped.

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, 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 and The inner wall of the lens mount 20 is connected. The opposite ends of the body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h along the axial direction are respectively defined as a first end 101 and a second end 102 , The body 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h is provided with a complex stray light elimination structure 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h on the inner ring surface 11 , The stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h are arranged at intervals around the axial direction, and each of the stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f , 13g, 13h are not in the same plane as the inner ring surface 11 of the body, each of the stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h has a closer to the first end 101 A third end and a fourth end closer to the second end 102, each of the stray light elimination structures 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h and the extension path of the third end It completely coincides with the connection of the fourth end.

In the main embodiment of the present invention, each of the stray light elimination structures 13, 13a, 13b is generally S-shaped and is a concave groove, as shown in FIGS. 5 to 7; however, in other embodiments of the present invention, each The stray light eliminating structures 13f, 13g, and 13h can be ㄑ-shaped grooves, as shown in FIGS. 11 to 13. Preferably, each of the stray light eliminating structures 13c, 13d, 13e includes two sections that are connected to each other. The section has an angle, which is not equal to 180 degrees; each of the stray light elimination structures 13c, 13d, 13e may be a broken line-shaped groove, as shown in FIGS. 8 to 10, preferably, wherein each of the stray light elimination structures 13f, 13g, and 13h 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 recess, in the main embodiment of the present invention, the radial cross section of the recess (stray light elimination structures 13, 13c, 13f) is a trapezoid with a narrower bottom and a wider opening, as shown in Figures 5, 8, and 8, As shown in Figure 11 (any two concave grooves form a convex rib, the radial cross-section of the convex rib is also a trapezoid with a narrower top surface); in other possible embodiments of the present invention, the concave groove (stray light Elimination structures 13a, 13d, 13g) The radial cross section is inverted triangle, as shown in Figure 6, Figure 9, Figure 12 (A convex rib is formed between any two grooves, and the radial cross section of the convex rib is triangular) ; The radial cross section of the bottom of the concave groove (stray light elimination structure 13b, 13e, 13h) can also be concave arc, as shown in Figure 7, Figure 10, Figure 13 (any two of the concave groove formed between a convex rib , The radial cross-section of the 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, including a disc-shaped body 10' (for example, a lens), the body 10' defines an axial direction, and the body 10 'There is an optical portion 14 in the center (actually for light to pass through for shaping), and on the radially outer side of the optical portion 14 there is an extinction portion 15 surrounding the optical portion 14. The body 10' is in the extinction The portion 15 is provided with a plurality of stray light elimination structures 13 which are arranged at intervals around the axial direction. The surface of each stray light elimination structure 13 is not in the same plane as the extinction portion 15 of the main body 10', and each of the stray light elimination structures 13 The light elimination structure 13 has a third end closer to the optical portion 14 and a fourth end farther away from the optical portion 14. The extension path of each stray light elimination structure 13 is different from the third end and the fourth end. The connections are completely overlapped.

In this embodiment, each of the stray light elimination structures 13 is generally S-shaped and is a concave groove, and the radial cross section of the groove (stray light elimination structure 13) is a trapezoid with a narrower bottom and a wider opening. However, as As mentioned above, in other possible embodiments, each of the stray light elimination structures can also be any non-linear shape such as a square shape or a broken line shape, and the radial cross section of the groove can be a circular arc shape or an inverted triangle shape. shape.

In actual use, as shown in Figure 4, when the optical element is installed in the lens mount and imaging is actually performed, the stray light elimination structures 13 provide a lot of surfaces that are not parallel to the annular surface of the body. Reflects stray light, and the stray light elimination structure 13 is not a straight line, that is, the inner side of the stray light elimination structure 13 is also non-planar. Stray light is scattered more evenly to avoid affecting 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. , A highly progressive effect.

10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10’: body 101: first end 102: second end 11: inner ring surface 12: Outer ring surface 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h: stray light elimination structure 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. Figure 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.

10: body

13: Stray light elimination structure

20: lens mount

Claims (18)

An optical element with a stray light elimination structure, comprising a body, the body is ring-shaped and defines an axial direction, the body has an inner ring surface and an outer ring surface, and the body is provided inside a lens mount. The outer ring surface is connected to the inner wall of the lens holder, the opposite ends of the body along the axial direction are defined as a first end and a second end, and 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, the surface of each stray light elimination structure is not in the same plane as the inner ring surface of the body, and each stray light elimination structure has a third closer to the first end And a fourth end closer to the second end, the extension path of each stray light elimination structure does not completely overlap with the connection line between the third end and the fourth end. The optical element with a stray light elimination structure as described in claim 1, wherein each of the stray light elimination structures is generally U-shaped. The optical element with a stray light elimination structure as described in claim 1, wherein each of the stray light elimination structures is generally S-shaped. The optical element with a stray light elimination structure as described in claim 1, wherein each of the stray light elimination structures is almost in the shape of a broken line. The optical element with a stray light elimination structure as described in claim 2, wherein each of the stray light elimination structures includes two sections that are connected to each other, and the two sections sandwich an angle, and the angle is not equal to 180 degrees. The optical element with a stray light elimination structure as described in claim 4, wherein each of the stray light elimination structures includes at least three sections interlaced with each other, and any two adjacent sections sandwich an angle, and the angle is not equal to 180 degree. The optical element with a stray light elimination structure according to any one of claims 1 to 6, wherein each of the stray light elimination structures is a concave groove, and the radial cross section of the bottom of the groove is generally concave arc shape. The optical element with a stray light elimination structure according to any one of claims 1 to 6, wherein each of the stray light elimination structures is a concave groove, and the radial cross section of the groove is an inverted triangle. The optical element having a stray light elimination structure according to any one of claims 1 to 6, wherein each of the stray light elimination structures is a recess, and the radial cross section of the recess is a trapezoid with a narrower bottom and a wider opening . An optical element with a stray light elimination structure, comprising a body defining an axial direction, the body having an optical part at the center, and a light-absorbing part surrounding the optical part on the radially outer side of the optical part, The body is provided with a plurality of stray light elimination structures on the matting part, and the stray light elimination structures are arranged at intervals around the axial direction. The surface of each stray light elimination structure is not in the same plane as the matting part of the body, and each stray light elimination structure The structure has a third end closer to the optical part and a fourth end farther away from the optical part, and the extension path of each stray light elimination structure does not completely coincide with the connection line between the third end and the fourth end. The optical element having a stray light elimination structure as described in claim 10, wherein each of the stray light elimination structures is generally U-shaped. The optical element with a stray light eliminating structure as described in claim 10, wherein each of the stray light eliminating structures is generally S-shaped. The optical element with a stray light elimination structure as described in claim 10, wherein each of the stray light elimination structures is almost in the shape of a broken line. The optical element having a stray light eliminating structure according to claim 11, wherein each of the stray light eliminating structures includes two sections that are connected to each other, and the two sections sandwich an angle, and the angle is not equal to 180 degrees. The optical element with a stray light elimination structure according to claim 13, wherein each of the stray light elimination structures includes at least three sections intersecting each other, and any two adjacent sections sandwich an angle, and the angle is not equal to 180 degree. The optical element with a stray light elimination structure according to any one of claims 10 to 15, wherein each of the stray light elimination structures is a concave groove, and the radial cross section of the bottom of the groove is generally concave arc shape. The optical element with a stray light elimination structure according to any one of claims 10 to 15, wherein each of the stray light elimination structures is a groove, and the radial cross section of the groove is an inverted triangle. The optical element having a stray light elimination structure according to any one of claims 10 to 15, wherein each of the stray light elimination structures is a recess, and the radial cross section of the recess is a trapezoid with a narrower bottom and a wider opening .

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