CN106814429B

CN106814429B - Lens group

Info

Publication number: CN106814429B
Application number: CN201510853241.5A
Authority: CN
Inventors: 王忠祥; 郭汉檥; 吕引栋; 颜裕峰
Original assignee: Himax Technologies Ltd
Current assignee: Himax Technologies Ltd
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2020-04-28
Anticipated expiration: 2035-11-30
Also published as: CN106814429A

Abstract

The invention relates to a lens group, wherein a lens frame is provided with a convex rib side wall and an arc base which are integrally formed. The first lens is embedded in the lens frame by the convex rib side wall and directly contacts the convex arc bottom surface of the arc base. The second lens is embedded in the lens frame by the convex rib side wall, and the first lens is separated by a first air gap.

Description

Lens group

Technical Field

The present invention generally relates to a lens assembly. In particular, the present invention is directed to a lens group in which a plurality of lenses having different shapes can be fitted in a lens frame using a convex rib. The lens group enables the technology that a plurality of lenses with different sizes can be stably clamped in the lens frame without adhesives or photosensitive adhesives.

Background

Wearable displays are a novel near-eye display, generally classified as head-mounted displays (HMDs) or head-up displays (HUDs). The wearable display can create a large virtual image in the field of view of one or both eyes. To the eyes of the user, the virtual image appears to be present at a distance and is much larger than the image created by the same display panel used to create the image.

In most of the conventional manufacturing processes for fabricating the lens assembly of the head up display, as shown in fig. 1, an adhesive and an ultraviolet-sensitive adhesive are applied on the

lenses

11, 12, 13 of the lens assembly 1, for example, the steps of dispensing, aligning, gluing, providing the photosensitive adhesive, aligning and ultraviolet-setting are performed, so that the

lenses

11, 12, 13 can be fixed in the continuous frame 15 by the adhesive 10 to form the lens assembly 1 of the display shown in fig. 2. Such a complicated process significantly increases the complexity and manufacturing time of the assembly process of the lens assembly.

Disclosure of Invention

Accordingly, the present invention provides a novel lens assembly. The lens group provided by the invention actively omits an adhesive and photosensitive adhesive, and can still stably arrange a plurality of lenses in the lens frame so as to solve the problems encountered in the prior art.

The invention provides a lens group, which comprises a lens frame, a first lens and a second lens. The lens frame is provided with a convex rib side wall and an arc base which are integrally formed. The first lens is embedded in the lens frame by the aid of the first convex ribs on the side walls of the convex ribs and directly contacts with the convex arc bottom surface of the arc base. The second lens is embedded in the lens frame by the second convex rib of the convex rib side wall, and the second lens is separated from the first lens by a first air gap. In particular, the second lens surface can be larger or smaller than the size or shape of the first lens surface.

In one embodiment of the present invention, the outer shape of the lens frame is a non-equilateral polygon.

In another embodiment of the invention, the rib side walls are discontinuous side walls.

In another embodiment of the present invention, the rib sidewalls are located on the inner frame of the lens frame to correspond to the concave rib sidewalls on the outer frame of the lens frame.

In another embodiment of the present invention, the first rib has one of a rectangular, trapezoidal or triangular cross section to conformably receive the edge of the first lens.

In another embodiment of the present invention, the edge of the first lens corresponds to the shape of the first rib for being compliantly received in the lens frame.

In another embodiment of the present invention, the edge of the first lens corresponds to the shape of the circular arc base for being conformably received in the lens frame.

In another embodiment of the present invention, one of the first lens and the second lens is a lenticular lens.

In another embodiment of the present invention, one of the first lens and the second lens is a filter.

In another embodiment of the present invention, the lens set further includes a third lens. The third lens is embedded in the lens frame by the third convex rib of the convex rib side wall, and the third lens is separated from the second lens by a second air gap.

In another embodiment of the invention, the third lens has a larger specular surface than the second lens.

In another embodiment of the present invention, the lens frame is made of an elastic material.

In another embodiment of the present invention, there is no adhesive between the first lens, the second lens and the lens frame.

In another embodiment of the present invention, the curved base defines a viewing window that is a viewable area.

The novel lens group provided by the invention actively omits the adhesive and photosensitive adhesive used in the prior art, and is changed into the structural combination of the convex rib side wall and the arc base of the lens frame. With the technical scheme, a plurality of lenses with different sizes or dimensions can still be stably clamped in the lens frame, so that the problems in the prior art are solved.

Drawings

Fig. 1 is a schematic diagram illustrating a prior art requirement for applying an adhesive and an ultraviolet photosensitive glue on a mirror surface of a lens assembly.

FIG. 2 is a schematic diagram of a portion of a lens assembly of a prior art display.

Fig. 3 is an exploded view of the lens assembly of the present invention.

Fig. 4 is a schematic view of the assembly of the lens set of the present invention.

Fig. 5 shows a partially enlarged schematic view of the lens group of fig. 4.

Fig. 6 to 9 show the cross-sectional shape of the ribs of the lens group of the present invention.

Detailed Description

The invention provides a novel lens group. The lens group of the invention actively omits adhesives and photosensitive adhesives, and can still stably arrange a plurality of different lenses in the lens frame, thereby solving the problems encountered in the prior art.

Fig. 3 is an exploded view of the lens assembly of the present invention, fig. 4 is an integrated view of the lens assembly of the present invention, and fig. 5 is an enlarged view of a portion of the lens assembly of fig. 4. Referring to fig. 3, fig. 4 and fig. 5, respectively, the lens assembly 100 of the present invention includes a first lens element 110, a second lens element 120, a third lens element 130 and a lens frame 140. The lens frame 140 is preferably made of a resilient material, such as plastic, metal or a combination thereof, and has a rib sidewall 145 and a circular arc base 148 integrally formed therewith.

In order to fit the design of a head-mounted display or a head-up display, the outer shape of the lens frame 140 is not necessarily a symmetrical geometric shape, such as a quadrilateral. As shown in fig. 3, the outer shape of the lens frame 140 may be a scalene polygon. Preferably, the corner portion of the lens frame 140 may also be a rounded corner. In addition, the rib sidewalls 145 of the lens frame 140 are discontinuous in order to match the light weight design of the head-mounted display or the head-up display. Fig. 3 shows that the rib side wall 145 of the lens frame 140 is not continuous but has a hollowed-out portion 146.

In one embodiment of the present invention, the rib sidewall 145 may comprise a rib. For example, the rib sidewall 145 may include a first rib 141, a second rib 142, and a third rib 143. In another embodiment of the present invention, the lens frame 140 may further comprise concave rib side walls 147. The concave rib sidewall 147 is located at the outer frame portion of the lens frame 140 to correspond to the convex rib sidewall 145 located at the inner frame portion of the lens frame 140.

The cross-section of each rib of the present invention can match the shape of the edge of each lens to conformably receive the edge of each lens, such as the edge of the first lens 110, the edge 122 of the second lens 120, or the edge of the third lens 130. Fig. 6-9 are schematic cross-sectional views of ribs of the lens assembly 100 of the present invention. As shown in fig. 6 to 9, which only exemplifies the second rib 142 and the edge 122 of the second lens as a non-limiting example, the cross-sectional shapes of the first rib 141, the second rib 142, and the third rib 143 may be independently one of a rectangle, a trapezoid, or a triangle.

Each lens is correspondingly engaged with the lens frame 140 by the protruding ribs protruding from the protruding rib side walls 145. For example, the edge of the first lens 110 is fit into the lens frame 140 in a corresponding shape of the first protruding rib 141 protruding from the protruding rib sidewall 145. Meanwhile, the first lens element 110 is located at the lowest portion of the lens assembly 100 and directly contacts the convex bottom surface 149 of the circular arc base 148, so that the edge of the first lens element 110 preferably also corresponds to the shape of the circular arc base 148 and is compliantly accommodated in the lens frame 140.

The convex bottom surface 149 slightly protrudes upward from the circular base 148, and together with the first convex rib 141, the first lens 110 is firmly engaged in the lens frame 140. The rounded base 148 completely surrounds and encircles the edge of the first lens element 110, thereby defining the viewing area of the lens set 100. In other words, the portion of the first lens element 110 not surrounded and encircled by the hollow 144 of the circular arc base 148 is a viewing window of the lens frame 140.

Similarly, the second lens 120 is also engaged with the lens frame 140 via the second rib 142 of the rib sidewall 145. In addition, since the second lens 120 is located between the first rib 141 and the second rib 142, the first rib 141 and the second rib 142 together firmly fit the second lens 120 in the lens frame 140. In addition, the second lens 120 is separated from the first lens 110 by the first air gap 111, so the second lens 120 does not directly contact the first lens 110 due to the separation of the first air gap 111. The presence of the first air gap 111 facilitates adjusting the optical properties of the lens set 100.

One feature of the lens assembly 100 of the present invention is that the flexible and polygonal lens frame 140 allows multiple lenses of different sizes and shapes to be securely engaged with the lens frame 140. For example, the shape of the second lens 120 may be the same as or different from the shape of the first lens 110. In another preferred embodiment of the present invention, the second lens 120 can have a mirror surface that is larger or smaller than the mirror surface of the first lens 110.

Similarly, the third lens 130 at the outermost layer is also engaged with the lens frame 140 by the third protruding rib 143 protruding from the protruding rib sidewall 145, and particularly, the third protruding rib 143 can prevent the third lens 130 from falling out of the lens frame 140. In addition, since the third lens 130 is positioned between the third rib 143 and the second rib 142, the third rib 143 and the second rib 142 together firmly fit the third lens 130 into the lens frame 140. In addition, the third lens 130 is separated from the second lens 120 by the second air gap 121, so the third lens 130 does not directly contact the second lens 120 due to the separation of the second air gap 121. The existence of the second air gap 121 is beneficial to adjusting the optical properties of the lens set 100. As mentioned above, the shape of the second lens 120 can be the same as or different from the shape of the third lens 130, or the mirror surface of the third lens 130 can be larger or smaller than the mirror surface of the second lens 120. Optionally, the lens assembly 100 can be designed to accommodate three or more lenses according to the above principles.

In one embodiment of the present invention, one of the first lens 110, the second lens 120, and the third lens 130 may be a lenticular lens. In another embodiment of the present invention, another of the first lens 110, the second lens 120, and the third lens 130 may be a color filter. For example, the first lens element 110, the second lens element 120, and the third lens element 130 may be red, green, blue, or yellow filters, respectively.

Since the adhesive and the photosensitive adhesive are omitted from the lens assembly 100 of the present invention, there is no adhesive or photosensitive adhesive between the first lens element 110, the second lens element 120, the third lens element 130 and the lens frame 140 in the lens assembly 100 of the present invention. Therefore, the need of coating the adhesive and the ultraviolet photosensitive glue on the mirror surface of the lens group can be omitted, thereby simplifying the complexity of the assembly process of the lens group and speeding up the manufacturing process of the lens group.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the present invention.

Description of the reference numerals

1 lens group

10 glue

11. 12, 13 lens

15 continuous frame

100 lens group

110 first lens

111 first air gap

120 second lens

121 second air gap

122 edge of the second lens

130 third lens

140 lens frame

141 first ribs

142 second rib

143 third rib

144 hollow

145 raised rib side wall

146 hollowed out portion

147 concave rib side wall

148 arc base

149 convex arc bottom surface.

Claims

1. A lens assembly, comprising:

the lens frame is provided with a convex rib side wall and an arc base which are integrally formed, wherein the convex rib side wall is a discontinuous side wall;

the first lens is embedded in the lens frame by virtue of a first convex rib on the side wall of the convex rib and directly contacts a convex arc bottom surface of the arc base; and

and the second lens is embedded in the lens frame by virtue of a second convex rib of the convex rib side wall, and simultaneously, the first lens is separated by a first air gap.

2. The lens set of claim 1, wherein the lens frame has a non-equilateral polygon shape.

3. The lens assembly of claim 1, wherein the raised rib sidewall is located on the inner frame of the lens frame to correspond to a recessed rib sidewall located on the outer frame of the lens frame.

4. The lens assembly of claim 1, wherein the first rib has a cross-section of one of a rectangular shape, a trapezoidal shape and a triangular shape to compliantly receive an edge of the first lens element.

5. The lens assembly of claim 1, wherein the first lens element has an edge corresponding to the shape of the first rib for conformably receiving in the lens frame.

6. The lens assembly of claim 1, wherein the rounded base completely surrounds and encircles the edge of the first lens such that the edge of the first lens is conformably received in the lens frame.

7. The lens assembly of claim 1, wherein one of the first and second lenses is a lenticular lens.

8. The lens assembly of claim 1, wherein one of the first lens element and the second lens element is a filter.

9. The lens assembly of claim 1, wherein the second lens element is larger than the first lens element.

10. The lens assembly of claim 1, further comprising:

and a third lens embedded in the lens frame by a third convex rib of the convex rib side wall, and simultaneously separating the second lens by a second air gap.

11. The lens assembly of claim 10, wherein the third lens element is larger than the second lens element.

12. The lens assembly of claim 1, wherein the lens frame is formed of an elastic material.

13. The lens set of claim 1, wherein there is no adhesive between the first lens, the second lens and the lens frame.

14. The lens assembly of claim 1, wherein the rounded base defines a viewing window that is a viewing area.