TW202132888A - Lens structure and manufacturing method thereof - Google Patents

Abstract

A lens structure includes a lens barrel, a lens and a buffer element. The lens barrel includes a main body portion and an abutting portion. The lens is disposed in the lens barrel and is located on the abutting portion. The buffer element is embedded in the lens. There is a gap between the buffer element and the main body portion of the lens barrel, and the gap is smaller than an extend length of the abutting portion.

Description

Lens structure

The present invention relates to an optical device, and particularly relates to a lens structure.

In the traditional lens structure, the assembly of the lens barrel and the lens uses interference coordination to achieve the stability of the optical performance of the lens. However, at high temperatures, the plastic lens barrel and the plastic lens squeeze each other due to the difference in thermal expansion, resulting in an irreversible surface change of the plastic lens, which in turn affects the Modulation Transfer Function (MTF) of the lens structure. Performance.

The invention provides a lens structure which can have better optical characteristics.

A lens structure according to an embodiment of the present invention includes a lens barrel, a lens, and a buffer member. The lens barrel includes a main body and an abutting portion. The lens is arranged in the lens barrel and located on the abutting part. The buffer is embedded in the lens. There is a gap between the buffer member and the main body of the lens barrel, and the gap is smaller than an extension length of the abutting portion.

A lens structure according to an embodiment of the present invention includes a lens barrel, a lens, and a buffer member. The lens is arranged in the lens barrel and has a light-transmitting area and a peripheral area surrounding the light-transmitting area. The buffer is embedded in the peripheral area of the lens and does not touch the inner wall of the lens barrel.

A manufacturing method of a lens structure according to an embodiment of the present invention includes the following steps. Provide a lens barrel. The lens barrel includes a main body and an abutting portion. Assemble a lens in the lens barrel, wherein the lens is located on the abutting part. A buffer element is embedded in the lens, wherein there is a gap between the buffer element and the main body of the lens barrel, and the gap is smaller than an extension length of the abutting portion.

Based on the above, in the design of the lens structure of the present invention, the buffer is embedded in the lens, and there is a gap between the buffer and the main body of the lens barrel. That is, the buffer does not contact the inner wall of the lens barrel. Therefore, when the external temperature changes (such as a high temperature state), the buffer can prevent the lens barrel and the lens from affecting each other due to their respective deformations, and can prevent the lens from eccentricity or position change. In this way, the lens structure of the present invention can have better optical characteristics and structural reliability.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a lens structure according to an embodiment of the invention. Please refer to FIG. 1, in this embodiment, the lens structure 100 includes a lens barrel 110, a lens 120 and a buffer 130. The lens barrel 110 includes a main body 112 and an abutting portion 114. The lens 120 is disposed in the lens barrel 110 and located on the abutting portion 114. In particular, the buffer member 130 is embedded in the lens 120, wherein there is a gap G between the buffer member 130 and the main body 112 of the lens barrel 110, and the gap G is smaller than an extension length L of the abutting portion 114. Here, the lens structure 100 of this embodiment is, for example, an imaging lens, but the invention is not limited to this.

In more detail, the abutting portion 114 of the lens barrel 110 of the present embodiment is formed by extending outward from the main portion 112, but it is not limited to this. In an embodiment, the abutting portion 114 may also be replaced by an additional gasket or spacer. In another embodiment, the abutting portion 114 may also be the peripheral area of another plastic lens. In another embodiment, the lens barrel 110 may also include a large main body portion and a small main body portion, wherein the small main body portion is sleeved in the large main body portion, and the large main body portion is the main body portion 112, and the small main body portion is the abutment部114. The above-mentioned forms of the abutting portion 114 all belong to the scope of the present invention. The material of the lens barrel 110 in this embodiment is, for example, an opaque plastic, which may be referred to as a black plastic for short. The material of the lens 120 in this embodiment is, for example, a transparent plastic, which may be referred to as a plastic white piece for short. The lens 120 has a light-transmitting area 122 and a peripheral area 124 surrounding the light-transmitting area 122. Here, the light-transmitting area 122 is the area where light passes through the lens 120. The peripheral area 124 of the lens 120 is located on the abutting portion 114 of the lens barrel 110, so the light will be blocked by the abutting portion 114 of the lens barrel 110 and cannot penetrate the peripheral area 124 of the lens 120. In other words, the peripheral area 124 can be regarded as an area where light cannot pass through the lens 120.

The lens 120 of this embodiment is disposed in the lens barrel 110 and has a light-transmitting area 122 and a peripheral area 124 surrounding the light-transmitting area 122. The buffer member 130 is embedded in the peripheral area 124 of the lens 120 and does not contact the inner wall of the lens barrel 110. Here, the material of the buffer member 130 is different from the material of the lens 120. In another embodiment, during the plastic injection molding process, after the first material is injected, a second material different from the first material can be replaced, so that the material of the buffer member 130 can be different from the material of the lens 120. The buffer 130 in this embodiment is, for example, an air layer. In other words, the peripheral area 124 of the lens 120 has a through hole, and the buffer member 130 is located in the through hole, so as to absorb the stress generated by the lens barrel 110 due to thermal expansion. In one embodiment, the through hole may be a ring-shaped through hole, so the buffer member 130 may be a ring-shaped buffer member; or, in another embodiment, the through hole may be at least two independent through holes, Therefore, the buffer member 130 can also be at least two buffer members independently of each other, and the above all belong to the scope of the present invention.

In terms of manufacturing, the manufacturing method of the lens structure of this embodiment firstly provides the lens barrel 110 including the main body 112 and the abutting portion 114. Next, the lens 120 is assembled in the lens barrel 110, wherein the lens 120 is located on the abutting portion 114. Afterwards, the buffer member 130 is embedded in the lens 110, wherein there is a gap G between the buffer member 130 and the main body 112 of the lens barrel 110, and the gap G is smaller than the extension length L of the abutting portion 114. So far, the manufacturing method of the lens structure 100 has been completed.

In short, in the design of the lens structure 100 of this embodiment, an expansion absorbing structure (ie the buffer 130) is added between the light-transmitting area 122 of the lens 120 and the outer diameter of the lens 120 (that is, the position of the peripheral area 124) , To absorb the compression of the lens barrel 110, thereby maintaining the optical performance of the overall lens structure 100. Because the lens structure 100 of this embodiment has the design of the buffer 130, the surface shape of the lens 120 changes little. That is, the buffer member 130 can ensure that the lens structure 100 does not change in the surface shape of the lens 120 at a high temperature, and it can ensure that the surface shape of the lens 120 does not change after the lens structure 100 returns from a high temperature to room temperature. That is to say, this embodiment uses mechanical principles to achieve the surface stability of the lens 120 in which the lens structure 100 returns to room temperature after high temperature and high temperature, so as to achieve the effect of stabilizing the performance of the lens structure 100. Therefore, the lens structure 100 with the design of the buffer member 130 of the present embodiment can ensure that it maintains better optical performance in a high temperature state and after returning from a high temperature to a room temperature.

It should be noted that in the above embodiment, the material of the buffer member 130 is different from the material of the lens 120, but the present invention is not limited thereto. In other embodiments, the material of the buffer member 130 can also be partially the same as the material of the lens 120.

It must be noted here that the following embodiments use the element numbers and part of the content of the foregoing embodiments, wherein the same numbers are used to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, refer to the foregoing embodiments, and the following embodiments will not be repeated.

FIG. 2A is a schematic cross-sectional view of a cushioning element according to an embodiment of the present invention. 1 and 2A at the same time, the buffer member 130a of this embodiment is similar to the buffer member 130 of FIG. 1, the difference between the two is: the buffer member 130a of this embodiment includes a structural layer 132a and at least one air gap The ground shows two air gaps 134a), and the air gap 134a is located in the structure layer 132a and is in direct contact with the structure layer 132a. Here, the material of the structural layer 132a is the same as the material of the lens 120, which means that the material of the structural layer 132a is also transparent plastic. As shown in 2A, the shape of the structure layer 132a is, for example, an inverted S-shape, and the air gap 134a is filled in the inverted S-shaped gap and is alternately arranged with the structure layer 132a.

Although the structural layer 132a of this embodiment is made of the same material as the lens 120, since the buffer 130a also includes an air gap 134a, when the external temperature changes (such as a high temperature state), the air gap 134a of the buffer 130a can absorb the lens barrel 110 (please refer to Figure 1) due to the stress caused by thermal expansion to prevent the lens barrel 110 (please refer to Figure 1) and the lens 120 (please refer to Figure 1) from being affected by their respective deformations, thereby preventing the lens 120 (Please refer to Figure 1) Eccentricity or position change occurs.

FIG. 2B is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention. 2A and 2B at the same time, the buffer 130b of this embodiment is similar to the buffer 130a of FIG. 2A, the difference between the two is: the buffer 130b of this embodiment includes a structural layer 132b and at least one air gap The ground shows two air gaps 134b), and the air gap 134b is located in the structure layer 132b and is in direct contact with the structure layer 132b. Here, the shape of the structural layer 132b is, for example, an N shape, and the air gap 134b is arranged vertically.

FIG. 2C is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention. 2A and 2C at the same time, the buffer 130c of this embodiment is similar to the buffer 130a of FIG. 2A, the difference between the two is: the buffer 130c of this embodiment includes a structural layer 132c and at least one air gap The ground shows an air gap 134c), and the air gap 134c is located in the structure layer 132c and is in direct contact with the structure layer 132c. Here, the shape of the structural layer 132c is, for example, a U shape, and the structural layer 132c surrounds the air gap 134c.

2D is a schematic cross-sectional view of a cushioning member according to another embodiment of the invention. Please refer to FIGS. 2A and 2D at the same time. The buffer member 130d of this embodiment is similar to the buffer member 130a of FIG. The ground shows two air gaps 134d), and the air gap 134d is located in the structure layer 132d and is in direct contact with the structure layer 132d. Here, the shape of the structural layer 132d is, for example, an H shape, and the air gap 134d is arranged vertically.

FIG. 2E is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention. 2A and 2E at the same time, the buffering member 130e of this embodiment is similar to the buffering member 130a of FIG. 2A, the difference between the two is: the buffering member 130e of this embodiment includes a structural layer 132e and at least one air gap The ground shows four air gaps 134e), and the air gaps 134e are located in the structure layer 132e and are in direct contact with the structure layer 132e. Here, the shape of the structure layer 132e is, for example, a grid shape, and the air gaps 134e and the structure layer 132e are alternately arranged.

It is worth mentioning that the above-mentioned embodiments mentioned that the shapes of the structural layers 132a, 132b, 132c, 132d, and 132e of the buffer members 130a, 130b, 130c, 130d, 130e are inverted S-shaped, N-shaped, U-shaped, and H-shaped, respectively. Glyph and grid shape, but not limited to this. In other embodiments not shown, the structural layer of the buffer member can also have other suitable shapes, as long as the air gap exists in the structural layer to form a composite material buffer member with the structural layer, it belongs to the present invention. The scope of protection.

In summary, in the design of the lens structure of the present invention, the buffer is embedded in the lens, and there is a gap between the buffer and the main body of the lens barrel. That is, the buffer does not contact the inner wall of the lens barrel. Therefore, when the external temperature changes (such as a high temperature state), the buffer can prevent the lens barrel and the lens from affecting each other due to their respective deformations, and can prevent the lens from eccentricity or position change. In this way, the lens structure of the present invention can have better optical characteristics and structural reliability.

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 relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100: lens structure 110: lens barrel 112: main body 114: abutment 120: lens 122: Transmitting area 124: Surrounding area 130, 130a, 130b, 130c, 130d, 130e: buffer 132a, 132b, 132c, 132d, 132e: structural layer 134a, 134b, 134c, 134d, 134e: air gap G: gap L: extended length

FIG. 1 is a schematic cross-sectional view of a lens structure according to an embodiment of the invention. FIG. 2A is a schematic cross-sectional view of a cushioning element according to an embodiment of the present invention. FIG. 2B is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention. FIG. 2C is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention. 2D is a schematic cross-sectional view of a cushioning member according to another embodiment of the invention. FIG. 2E is a schematic cross-sectional view of a cushioning member according to another embodiment of the present invention.

100: lens structure

110: lens barrel

112: main body

114: abutment

120: lens

122: Transmitting area

124: Surrounding area

130: Buffer

G: gap

L: extended length

Claims (10)

A lens structure including: A lens barrel, including a main body and an abutting part; A lens arranged in the lens barrel and located on the abutting portion; and A buffer element is embedded in the lens, wherein there is a gap between the buffer element and the main body portion of the lens barrel, and the gap is smaller than an extension length of the abutting portion. A lens structure including: A lens tube A lens arranged in the lens barrel and having a light-transmitting area and a peripheral area surrounding the light-transmitting area; and A buffer piece is embedded in the peripheral area of the lens and does not touch the inner wall of the lens barrel. The lens structure according to claim 1 or claim 2, wherein the material of the buffer is different from the material of the lens. The lens structure according to claim 3, wherein the buffer member includes an air layer. The lens structure according to claim 1 or claim 2, wherein the buffer member includes a structural layer and at least one air gap, and the air gap is located in the structural layer and is in direct contact with the structural layer. The lens structure according to claim 5, wherein the material of the structure layer is the same as the material of the lens. The lens structure according to claim 6, wherein the material of the structure layer is a transparent plastic. The lens structure according to claim 5, wherein the shape of the structure layer includes one of the following shapes: an inverted S shape, an N shape, a U shape, an H shape, and a grid shape. According to the lens structure of claim 1 or claim 2, wherein the material of the lens barrel is an opaque plastic. A method for manufacturing a lens structure, including: A lens barrel is provided, the lens barrel includes a main body and an abutting portion; Assembling a lens in the lens barrel, wherein the lens is located on the abutting portion; and A buffer element is embedded in the lens, wherein there is a gap between the buffer element and the main body portion of the lens barrel, and the gap is smaller than an extension length of the abutting portion.

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