TW201621446A - Light blocking element and lens assembly including the same - Google Patents

Abstract

A light blocking element of the present invention is adapted for being arranged beside a lens. The light blocking element has a main body which is ring-shaped and plate-shaped. The main body is formed with a through hole. The main body defines an inner annular margin and an outer annular margin. The through hole is defined by the inner annular margin. The inner annular margin is radially formed with a plurality of recesses so that the inner annular margin is undulate. As a result, the light blocking element of the present invention is able to diverge the reflected light to reduce light halo.

Description

Shading element and optical lens group having the same

The present invention relates to a shading element and an optical lens unit having the shading element.

In the conventional optical lens group, a light shielding sheet is often provided beside the lens, as described in the patent publications TW201020089, TW201123869, TW201307935, etc. However, in general, the inner edge of the light shielding sheet is arc-shaped smooth when incident. When the light is irradiated to the light shielding sheet, the direction of reflection of the stray light and the energy concentration are caused, thereby causing a significant halo situation and affecting the imaging problem.

Therefore, how to reduce the halo phenomenon caused by the shading sheet reflecting stray light has become an urgent problem to be solved in the industry.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a shading element and a visible or invisible optical lens assembly including the shading element that reduces halation caused by stray light.

In order to achieve the above object, the present invention provides a light shielding device for providing an optical lens, wherein the optical lens has a light transmitting portion and a fixing portion surrounding the outer edge of the light transmitting portion, and the light shielding member includes a ring body. Having a perforation in the center thereof, the ring body defines a first surface and a second surface, and the ring body defines an inner ring edge and an outer ring edge, and the inner ring edge defines the perforation, the ring The sheet body is disposed at one of the first side or the second side thereof The fixing portion of the optical lens has a plurality of concave portions radially recessed so that the inner annular contour is not a smooth perfect circle.

In order to achieve the above object, the present invention further provides a visible or invisible optical lens assembly, comprising the above-mentioned light shielding member, further comprising at least one optical lens, the optical lens having a light transmitting portion and a surrounding surrounding the outer edge of the light transmitting portion The fixing portion is disposed on the fixing portion of the optical lens with one of the first surface or the second surface thereof.

Thereby, the present invention can effectively reduce stray light that is excessively concentrated when incident light is incident, and can reduce halation.

Prior art

11'‧‧‧ shading elements

111’‧‧‧ ring body

112’‧‧‧ Inner Ring

this invention

10‧‧‧Optical lens group

11‧‧‧ shading elements

111, 111d‧‧‧ ring body

112, 112a, 112b, 112c, 112d‧‧‧ inner ring

1121, 1121a, 1121b, 1121c‧‧‧ recessed

113‧‧‧ skirt

12‧‧‧ optical lens

121‧‧‧Transmission Department

122‧‧‧Fixed Department

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an optical lens unit of the present invention.

Fig. 2 is an exploded perspective view of the optical lens unit of the present invention.

Fig. 2A is a cross-sectional view showing an optical lens unit of the present invention.

Figure 3A is a front elevational view of the shading element of the present invention.

3B to 3D are front views of the shading members of the second to fourth embodiments of the present invention.

Figure 4 is a perspective view of the shading element of the present invention.

Figure 5 is a perspective view of a shading member in accordance with a fifth embodiment of the present invention.

Fig. 6 is a schematic view showing the stray light of the shading element of the prior art.

Fig. 7 is a schematic view showing the stray light of the shading member of the present invention.

Fig. 8A is a conventional simulation diagram of stray light energy.

Figure 8B is a simulation diagram of the stray light energy of the present invention.

Figure 9A is a diagram of a conventional stray light energy distribution.

Figure 9B is a diagram showing the stray light energy distribution of the present invention

FIG. 10A is an explanatory diagram of the distribution of stray light energy conditions of FIG. 8A

Fig. 10B is an explanatory diagram showing the distribution of stray light energy conditions of the present invention.

Figure 11A is a diagram of a conventional stray light energy distribution.

Figure 11B is a diagram showing the stray light energy distribution of the present invention.

Figure 12A is a diagram of a conventional stray light energy distribution.

Figure 12B is a diagram showing the stray light energy distribution of the present invention.

The following is a description of the possible embodiments of the present invention, and is not intended to limit the scope of the invention as claimed.

Referring to FIG. 2 to FIG. 3A, the present invention provides a light shielding element 11 for use in an optical lens 12 (this embodiment is a visible light optical lens (for example, a camera lens). An optical lens (for example, a lens that receives infrared light or ultraviolet light), wherein the optical lens 12 has a light transmitting portion 121 and a fixing portion 122 surrounding the outer edge of the light transmitting portion 121. The light shielding member 11 includes a ring. The sheet body 111 has a through hole at a center thereof, and the ring body 111 defines a first surface and a second surface. The ring body 111 defines an inner ring edge 112 and an outer ring edge. The inner ring edge 112 The ring body defines the perforation, and the ring body 111 is disposed on the fixing portion 122 of the optical lens 12 with one of the first surface or the second surface thereof. The inner ring edge 112 is radially recessed with a plurality of concave portions 1121. The inner rim 112 contour is not a smooth perfect circle. Preferably, the inner ring edge 112 is recessed with at least ten recessed portions 1121, and the recessed portions 1121 are sequentially spaced.

In the main embodiment of the present invention, the radial section of each of the recessed portions 1121 The trapezoidal shape has a bottom portion narrower than the opening thereof, as shown in FIG. 3A. More preferably, the radial depth of each of the concave portions 1121 is greater than one tenth of the radius of the perforation. In this embodiment, each of the holes The radial depth of the recessed portion 1121 is about one-eighth of the radius of the perforation, that is, the depth of the recessed portion 1121 is larger in proportion to the whole and is considerably more apparent to the naked eye.

Referring again to Figures 3B-3D and 4, in other possible embodiments of the present invention, different aspects of the inner rim 112, 112a, 112b, 112c and the recesses 1121, 1121a, 1121b, 1121c are provided: for example The recessed portion 1121a of FIG. 3B has an angular shape and has two sides which are respectively convexly curved and concavely curved, and the opening width of the concave portion 1121a is smaller than the radial depth of the concave portion 1121a. In the embodiment, there are about 50 recessed portions 1121a, and the radial depth of each of the recessed portions 1121a is about one-ninth of the radius of the perforation; the recessed portion 1121b disclosed in FIG. 3C is actually one of the corners of the polygon; 3D discloses an inner ring edge 112c having an irregular shape, and the concave portions 1121c are different in shape from each other. More specifically, the contour shape, depth, interval, and width of each concave portion 1121c are different. The rim 112c has an irregular undulation.

Referring to FIG. 5 again, in another embodiment of the present invention, the ring body 111d forms a skirt 113 near the inner ring edge 112d, and the skirt 113 is not parallel to the first surface and the second surface. Slightly protruding from the ring body 111d, the convex surface of the adjacent lens can be avoided, or the light shielding position can be adjusted according to the actual light path.

With respect to the principle of the present invention, please refer to FIG. 6 and FIG. 7. The ring body 111' of the conventional shading element 11' has a smooth arc shape, and even a circular arc surface, which also causes incident light. The concentrating effect makes the stray light direction uniform, and finally produces a concentrated and obvious halo when projected on the imaging area, as shown in FIG. 6; and the ring body 111 of the shading element 11 of the present invention, The inner ring edge 112 has a concave portion 1121, so that the angle of the reflecting surface of the incident light is varied and not fixed, and the stray light direction is dispersed and not concentrated, thereby reducing the halo phenomenon, as shown in FIG.

Regarding the substantial difference between the present invention and the prior art, it is apparent from actual experiments, referring to FIG. 8A to FIG. 12B, the stray light experiment under the same conditions as the prior art (the inner ring smooth arc) is performed under the same conditions as the present invention. . Referring first to FIG. 8A and FIG. 9A, it can be seen that the prior art stray light projection positions are concentrated to form a fairly significant halo. In contrast, as shown in FIGS. 8B and 9B, the stray light projection position of the present invention can be seen. Dispersed, the formed halo is less obvious. Referring again to FIGS. 10A, 11A and 12A, the prior art stray light has a higher total luminosity and higher energy, and can also prove that the halo situation is severe. In contrast, FIGS. 10B, 11B and 12B, the stray light total luminosity of the present invention. Lower, lower energy, can demonstrate the efficacy of the present invention to reduce halation.

Referring to FIG. 1 to FIG. 2A, the present invention further provides an optical lens assembly 10 including the above-mentioned light shielding member 11 and at least one optical lens 12 having a light transmitting portion 121 and surrounding the light transmitting portion 121. A ring portion 111 is disposed on the fixing portion 122 of the optical lens 12 with one of the first surface or the second surface.

In summary, the shading element provided by the present invention can change the surface direction of the inner ring edge due to the concave portion with obvious depth, can effectively disperse the stray light direction, avoid the stray light from being concentrated and form a halo, and has a simple structure. Also manufactured, it is very effective.

10‧‧‧Optical lens group

11‧‧‧ shading elements

111‧‧‧ ring body

12‧‧‧ optical lens

121‧‧‧Transmission Department

122‧‧‧Fixed Department

Claims (9)

A light shielding member is disposed on an optical lens, wherein the optical lens has a light transmitting portion and a fixing portion surrounding the outer edge of the light transmitting portion, the light shielding member includes a ring body and has a through hole at a center thereof. The ring body defines a first face and a second face. The ring body defines an inner ring edge and an outer ring edge. The inner ring edge defines the through hole. The ring body has the first face or One of the second faces is disposed on the fixing portion of the optical lens, and the inner ring edge is radially recessed with a plurality of concave portions such that the inner annular contour is not a smooth perfect circle. The shading element of claim 1, wherein the inner rim is recessed with at least ten recesses, the recesses being spaced apart in sequence. The shading element of claim 1, wherein the recesses are different in shape from each other. The light-shielding member according to claim 1, wherein each of the concave portions has an angular cross section and has two sides which are respectively convexly curved and concavely curved. The shading element of claim 4, wherein an opening width of each of the recesses is smaller than a radial depth of the recess. The shading element of claim 1, wherein each of the concave portions has a trapezoidal radial shape and a bottom portion that is narrower than the opening. The shading member of claim 1, wherein the ring body forms a skirt near the inner ring edge, and the skirt is not parallel to the first surface and the second surface and protrudes slightly from the outer surface of the ring sheet . The shading element of claim 1, wherein a radial depth of each of the recesses is greater than one tenth of a radius of the perforations. An optical lens assembly comprising the light shielding member according to any one of claims 1 to 8, further comprising at least one optical lens having a light transmitting portion and an outer periphery surrounding the light transmitting portion a fixing portion, the ring body being disposed at a fixing portion of the optical lens with one of a first surface or a second surface thereof.