TWI693442B - Lens module - Google Patents

Abstract

A lens module includes a lens barrel, a first lens and an elastic member. The lens barrel includes a frontal wall adjacent to an objective side and an air vent, wherein the air vent is disposed on the frontal wall. The first lens is disposed in the lens barrel and constitutes an optical axis. The elastic member is disposed between the frontal wall and the first lens and corresponds to the air vent. The first lens has a sloping surface, and the sloping surface approaches the optical axis in a direction towards the frontal wall and is sloped at an angle with respect to the lens barrel. The lens module satisfies the following condition: 0.08<sinθ <0.9, wherein θ is the angle at which the sloping surface is sloped with respect to the lens barrel.

Description

Lens group (12)

The invention relates to a lens group, in particular to a lens group with an escape structure.

A conventional lens group (not shown) includes a lens barrel and a holder, and is usually provided with an escape structure for connecting the air inside and outside the lens group, thereby adjusting the temperature of the internal air. The escape structure can be implemented in two ways, as detailed below:

The first method is to create a vent hole (not shown) on the holder to form an exhaust channel on the lens group. The second method is to provide a notch (not shown) on an external threaded portion of the lens barrel to form an exhaust channel on the lens group.

However, since the exhaust channel formed by the above two methods does not communicate with the space in the lens barrel, the air in the lens barrel cannot be effectively exhausted. Therefore, the lens barrel is prone to pressure rise or moisture condensation due to temperature changes, so that the internal components of the lens barrel are displaced or deformed, thereby affecting the imaging quality of the lens group.

In view of this, the object of the present invention is to provide a lens group, an exhaust channel is formed between a lens barrel of the lens group and its internal components, so that the air inside and outside the lens barrel can be directly communicated, thereby improving the imaging of the lens group quality.

The lens assembly of one embodiment of the present invention includes a lens barrel, a first lens, and an elastic member. The lens barrel includes a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall. The first lens is arranged in the lens barrel and forms an optical axis. The elastic member is disposed between the front wall and the first lens, and corresponds to the ventilation hole. Wherein, the first lens has a slope, the slope gradually approaches the optical axis in a direction close to the front wall, and is at an angle with the lens barrel, and the lens group satisfies the following condition: 0.08<sinθ<0.9, where , Θ is the angle between the inclined plane and the lens barrel.

The lens assembly of another embodiment of the present invention includes a lens barrel, a first lens, and an elastic member. The lens barrel includes a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall. The first lens is arranged in the lens barrel and forms an optical axis. The elastic member is disposed between the front wall and the first lens, and corresponds to the ventilation hole. Wherein, the elastic member has a Ø diameter along the direction perpendicular to the optical axis, the vent hole has an aperture along the direction perpendicular to the optical axis, and the lens group satisfies the following conditions: 1<B/A<205 ; Where A is the aperture of the vent hole, and B is the Ø diameter of the elastic member.

In another embodiment, the first lens includes a first notch, and the first notch is disposed opposite to the vent hole, so that air can communicate with the vent hole and the first notch.

In another embodiment, wherein the lens barrel further includes a peripheral wall, the peripheral wall extends from an edge of the front wall to an image side, and has an inner peripheral surface, and the first lens and the elastic member bear against the Inner surface.

In another embodiment, the elastic member closely bears between the front wall and the first lens along a direction parallel to the optical axis, and closely bears against the inner periphery in a direction perpendicular to the optical axis surface.

In another embodiment, wherein the elastic member has a thickness in a direction parallel to the optical axis and a Ø diameter in a direction perpendicular to the optical axis, and the lens group satisfies the following conditions: 0<C /B<0.5. Where C is the thickness of the elastic member, and B is the Ø diameter of the elastic member.

In another embodiment, wherein the elastic member has a Ø diameter along a direction perpendicular to the optical axis, and a ring mask that bears against the front wall has an area, and the lens group satisfies the following conditions: 1mm< D/B<16mm. Where D is the area of the elastic member, and B is the Ø diameter of the elastic member.

In another embodiment, wherein the aperture gradually decreases in a direction approaching the first lens.

In another embodiment, wherein the front wall has a bearing surface, the elastic member closely bears between the bearing surface and the first lens, and the vent hole is disposed on the front wall away from the optical axis One side to avoid the bearing surface.

In another embodiment, wherein the lens barrel further includes a plurality of second lenses and a light-transmitting hole, the light-transmitting hole is disposed in the center of the front wall, the air-permeable hole is disposed outside the light-transmitting hole, etc. The second lens is disposed in the lens barrel and forms the optical axis with the first lens. The second lenses are provided with a plurality of second notches. The first notch and the second notches are respectively formed with the lens barrel There are a plurality of voids, and the ventilation holes and the voids form an exhaust channel.

10‧‧‧tube

11‧‧‧Front wall

13‧‧‧ Zhoubi

15‧‧‧Light hole

17‧‧‧Ventilation holes

19‧‧‧Mirror room

20‧‧‧Elastic parts

30‧‧‧First lens

40a, 40b, 40c, 40d ‧‧‧ second lens

100‧‧‧ lens group

111‧‧‧ bearing surface

131‧‧‧Inner peripheral surface

301‧‧‧The first gap

303‧‧‧Bevel

401a, 401b, 401c, 401d

A‧‧‧Aperture

B‧‧‧Ø diameter

C‧‧‧Thickness

θ‧‧‧angle

FIG. 1 is a schematic diagram of a lens group according to an embodiment of the invention.

Figure 2 is a cross-sectional view of the lens group in Figure 1.

Figure 3 is a cross-sectional view of the lens group in Figure 1.

Figure 4 is an enlarged view of part L in Figure 3.

Please refer to FIGS. 1 and 2, a lens group 100 according to an embodiment of the present invention includes a lens barrel 10, an elastic member 20, a first lens 30, and a plurality of second lenses 40a-40d, wherein the elastic member 20 1. The first lens 30 and the second lenses 40a-40d are disposed in the lens barrel 10, and the air inside and outside the lens barrel 10 is directly connected. The following details the assembly and operation of these components:

As shown in FIG. 2, the lens barrel 10 includes a front wall 11 and a peripheral wall 13. The front wall 11 is substantially circular and is adjacent to an object side, and the peripheral wall 13 extends from the edge of the front wall 11 to an image side, thereby forming a mirror chamber 19, and the mirror chamber 19 is used to accommodate the elastic member 20 and the first lens 30 and the second lenses 40a-40d. The front wall 11 has a bearing surface 111, the peripheral wall 13 has an inner peripheral surface 131, and both the bearing surface 111 and the inner peripheral surface 131 are used for the first lens 30 or the second lenses 40a-40d to bear. In addition, a light-transmitting hole 15 and a ventilation hole 17 are defined in the front wall 11. The light-transmitting hole 15 is disposed in the center of the front wall 11 and is used for light to pass through. The vent hole 17 is provided on the front wall 11 and is located on the outer side of the light-transmitting hole 15 (that is, the vent hole 17 is provided on the side of the front wall 11 farther from the optical axis), and is used to allow air to pass through. The optical effective path of the lens group 100 is affected. It is worth noting that the ventilation holes 17 will avoid the bearing surface 111 to avoid unevenness of the bearing surface 111, thereby reducing the occurrence of conditions that affect the assembly due to the unevenness of the bearing surface 111.

It should be particularly noted that the first lens 30 is provided with a first notch 301 corresponding to the vent hole 17 of the lens barrel 10, and the second lenses 40a-40d are provided with a plurality of second notches 401a-401d. Corresponds to the first gap 301. In this way, air can communicate with the vent hole 17, the first gap 301, and the second gaps 401a-401d.

During assembly, the elastic member 20 is first fixed in the mirror chamber 19, bearing against the bearing surface 111 of the front wall 11 and the inner peripheral surface 131 of the peripheral wall 13, and covers the ventilation holes 17 to prevent external light or dust from passing through the ventilation holes 17 Enter the lens barrel 10 to maintain the cleanliness inside the lens 10. The first lens 30 is then fixed in the mirror chamber 19, and bears against the bearing surface 111 of the front wall 11 by the elastic member 20, and also bears against the inner peripheral surface 131 of the peripheral wall 13. Finally, the second lenses 40a-40d are sequentially fixed in the mirror chamber 19, and bear against the inner peripheral surface 131 of the peripheral wall 13. The first lens 30 and the second lenses 40a-40d form an optical axis (not shown).

After the assembly is completed, the first gap 301 and the second gaps 401a to 401d form a plurality of gaps with the inner circumferential surface 131 of the peripheral wall 13 in the mirror chamber 19, and the ventilation holes 17 and the gaps constitute the lens group 100. An exhaust channel allows the air inside and outside the lens barrel 10 to communicate directly through the exhaust channel, to avoid the increase in the air pressure inside the lens barrel 10 or the occurrence of white mist due to changes in the heat and cold inside the lens group 100, thereby improving the imaging quality of the lens group 100 . In this embodiment, the vent hole 17, the first notch 301 and the second notches 401a-401d are located on the same plane, and the plane is parallel to the optical axis.

It can be understood that the vent hole 17, the first notch 301, and the second notches 401a-401d do not necessarily need to be on the same plane. In another embodiment, the vent hole 17, the first notch 301 and the second notches 401a~401d are not on the same plane, however, the vent hole 17, the first notch 301 and the second notches 401a~401d are in The structure is still in communication. The first notch 301 and the second notches 401a to 401d still form a plurality of gaps with the inner peripheral surface 131 of the peripheral wall 13 in the mirror chamber 19, that is, air can communicate with the ventilation holes 17, The first gap 301 and the second gaps 401a to 401d keep the air inside and outside the lens barrel 10 in direct communication.

Please refer to FIGS. 2 and 3 at the same time, the edge of the first lens 30 has a slope 303, and due to the existence of the first notch 301, the inclined surface 303 is not a complete ring, but a circular arc. Viewed from the cross section, the inclined surface 303 gradually approaches the optical axis along the direction approaching the front wall 11 and forms an angle θ with the inner peripheral surface 131 of the peripheral wall 13. By the arrangement of the inclined surface 303 and the angle θ, the edge of the elastic body 20 can swing with the airflow to achieve a better exhaust effect. The range of the angle θ between the first lens 30 and the inner peripheral surface 131 is 5-60 degrees. According to the range of the above-mentioned angle θ, the lens group 100 satisfies the following relational expressions (1) and (2): 0.08<sinθ<0.9...(1)

0.5<cosθ/sinθ<11.5…(2)

As shown in FIGS. 3 and 4, the elastic member 20 is a ring-shaped shading sheet. The elastic member 20 has a diameter B along the direction perpendicular to the optical axis and a thickness C along the direction parallel to the optical axis. Moreover, a ring mask that bears against the front wall 11 has an area D, where Ø diameter B is the maximum diameter of the outer ring of the elastic member 20. Specifically, the Ø diameter B of the elastic member 20 ranges from 2.5 to 20 mm (mm), the thickness C of the elastic member 20 ranges from 0.12 to 1 mm (mm), and the area D of the elastic member 20 ranges It is 4.5~300 square millimeters (mm ² ). It is worth noting that if the Ø diameter B and thickness C of the elastic member 20 are within the above range, the elastic member 20 will not affect other components due to the size being too large or too small, thereby ensuring that the lens group 100 has a better coaxiality Stability with assembly. According to the above range of Ø diameter B and thickness C, the lens group 100 further satisfies the following relationship (3): 0<C/B<0.5...(3)

In addition, if the Ø diameter B and area D of the elastic member 20 are within the above range, it is beneficial to the molding of the elastic member 20 to reduce the problem of affecting the assembly accuracy because the elastic member 20 cannot be molded or the flatness is not good, thereby avoiding the lens quality affected. According to the above range of Ø diameter B and area D, the lens group 100 further satisfies the following relationship (4): 1mm<D/B<16mm…(4)

As shown in FIG. 4 again, the vent hole 17 is a circular stepped hole. The vent hole 17 has an aperture A along the direction perpendicular to the optical axis, and the aperture A gradually decreases along the direction approaching the first lens 30. The range of the diameter A of the vent hole 17 is 0.1 to 2 millimeters (mm). In particular, if the Ø diameter B of the elastic member 20 and the aperture A of the vent hole 17 are within the above range, the elastic member 20 can prevent external dust from entering the lens barrel 10 through the vent hole 17 to achieve a better dustproof effect. According to the range of the Ø diameter B of the elastic member 20 and the aperture A of the vent hole 17, the lens group 100 further satisfies the following relationship (5): 1<B/A<205...(5)

As also shown in FIGS. 2 and 3, the elastic member 20 is disposed between the bearing surface 111 of the lens barrel 10 and the first lens 30, and bears against the inner peripheral surface 131 of the lens barrel. The holes 17 correspond to prevent external dust from entering the lens barrel 10 through the ventilation holes 17. Specifically, the elastic member 20 closely bears between the bearing surface 111 of the front wall 11 and the first lens 30 in a direction parallel to the optical axis, and closely bears against the lens barrel 10 in a direction perpendicular to the optical axis的内周面131. In this way, the elastic member 20 is configured to ensure the stability of the assembly, so that the components closely depend on each other, so as to have better reliability during the drop test, and maintain the lens group 100 with good imaging quality.

The lens assembly structure of the invention is simple and easy to assemble. A hole is formed in the front wall of the lens barrel adjacent to the object side, and an exhaust channel is formed between the lens barrel and its internal components to achieve external circulation convection, thereby making the lens barrel The air inside and outside can be directly communicated, so when the lens group is working, the internal components such as the printed circuit board (Printed circuit board) emits heat or the environmental factors such as mist, water vapor and other gases can be smoothly and completely discharged, and then Improve the imaging quality of the lens group.

10‧‧‧tube

11‧‧‧Front wall

13‧‧‧ Zhoubi

15‧‧‧Light hole

17‧‧‧Ventilation holes

30‧‧‧First lens

100‧‧‧ lens group

Claims (10)

A lens group includes: a lens barrel, including a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall; a first lens is disposed in the lens barrel and constitutes An optical axis; and an elastic member, disposed between the front wall and the first lens, and corresponding to the vent hole; wherein, the first lens has a slope, the slope along the direction close to the front wall It gradually approaches the optical axis and is at an angle with the lens barrel, and the lens group satisfies the following condition: 0.08<sinθ<0.9; where θ is the angle between the inclined plane and the lens barrel. A lens group includes: a lens barrel, including a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall; a first lens is disposed in the lens barrel and constitutes An optical axis; and an elastic member disposed between the front wall and the first lens and corresponding to the vent hole; wherein, the elastic member has a along the direction perpendicular to the optical axis

Diameter, the vent hole has an aperture along the direction perpendicular to the optical axis, and the lens group satisfies the following conditions: 1<B/A<205; where A is the aperture of the vent hole, and B is the elasticity Piece of

path. A lens group includes: a lens barrel, including a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall; a first lens is disposed in the lens barrel and constitutes An optical axis; and An elastic member is disposed between the front wall and the first lens, and corresponds to the vent hole; wherein the first lens includes a first notch, and the first notch is disposed opposite to the vent hole, so that air can It is connected to the ventilation hole and the first gap. A lens group includes: a lens barrel, including a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall; a first lens is disposed in the lens barrel and constitutes An optical axis; and an elastic member, disposed between the front wall and the first lens, and corresponding to the air vent; wherein the air vent has an aperture along a direction perpendicular to the optical axis; wherein the The aperture gradually decreases along the direction approaching the first lens. A lens group includes: a lens barrel, including a front wall adjacent to an object side and a vent hole, wherein the vent hole is disposed on the front wall; a first lens is disposed in the lens barrel and constitutes An optical axis; and an elastic member, disposed between the front wall and the first lens, and corresponding to the vent hole; wherein the front wall has a bearing surface, the elastic member closely bears the bearing Between the surface and the first lens, and the vent hole is disposed on a side of the front wall farther away from the optical axis to avoid the bearing surface. The lens group according to any one of items 1, 2, 3, 4, and 5 of the patent application scope, wherein the lens barrel further includes a peripheral wall, the peripheral wall extends from an edge of the front wall to an image side, and has An inner peripheral surface, and the first lens and the elastic member bear against the inner peripheral surface. The lens group as described in item 6 of the patent application scope, wherein the elastic member closely bears between the front wall and the first lens in a direction parallel to the optical axis and in a direction perpendicular to the optical axis Closely rely on the inner peripheral surface. The lens group according to any one of items 1, 2, 3, 4, and 5 of the patent application scope, wherein the elastic member has a thickness along a direction parallel to the optical axis and perpendicular to the optical axis Has a direction of

Diameter, and the lens group satisfies the following conditions: 0<C/B<0.5; where C is the thickness of the elastic member and B is the thickness of the elastic member

path. The lens group according to any one of items 1, 2, 3, 4, and 5 of the patent application scope, wherein the elastic member has a along the direction perpendicular to the optical axis

The diameter of the ring mask that bears against the front wall has an area, and the lens group meets the following conditions: 1mm<D/B<16mm; where D is the area of the elastic member, and B is the elastic member Of this

path. The lens group as described in item 3 of the patent application scope, wherein the lens barrel further includes a plurality of second lenses and a light-transmitting hole, the light-transmitting hole is provided in the center of the front wall, and the air-permeable hole is provided in the light-transmitting Outside the hole, the second lenses are arranged in the lens barrel and form the optical axis with the first lens, the second lenses are provided with a plurality of second notches, the first notch and the second notches A plurality of gaps are formed with the lens barrel, respectively, and the air vent and the gaps form an exhaust channel.

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