Patent Application
20210048599
The present invention relates to a lens module and a lens mount.
A lens module is usually composed of a lens mount and a plurality of lenses. The lens mount has plural stepped faces on the inner peripheral face for the lenses to abut against in order to make the positions of the lenses precise. A positioning ring fixed at an end of the lens mount having a larger inner diameter is often used to prevent the lens from falling for protection.
The positioning ring is usually positioned to the lens mount by tight-fitting or engaging structure. Patent TW 1616698 disclosed another means to position the positioning ring. The inner peripheral face of the lens mount is formed with plural grooves extending axially, and the grooves are injected with adhesive to fix the positioning ring.
However, the structure has at least two disadvantages. First, the adhesive may reach the other side of the positioning ring to contaminate the lenses. Second, the contact area between the positioning ring and the lens mount is reduced because of the grooves. When the adhesive deteriorates, the positioning ring may fall from the lens mount.
The main object of the present invention is to provide a lens module and a lens mount for positioning the positioning ring on the lens mount tightly and to prevent the adhesive from reaching the lens.
To achieve the above and other objects, the lens module of the present invention includes a lens mount, at least one lens, and a positioning ring.
The lens mount is cylinder-shaped and has an inner peripheral face. A receiving space is enclosed by the inner peripheral face. The lens mount has a first end and a second end along an axial direction thereof The inner peripheral face has a positioning section near the first end. The at least one lens is arranged in the receiving space. An outer peripheral face of the at least one lens contacts the inner peripheral face of the lens mount. The positioning ring is arranged in the receiving space. An outer peripheral face of the positioning ring is connected to the positioning section of the lens mount to prevent the at least one lens from falling out via the first end of the lens mount. An end of at least one of the positioning section and the outer peripheral face of the positioning ring near the first end is formed with at least one groove. The at least one groove is open toward the first end. A length of the at least one groove along the axial direction is smaller than a length of the outer peripheral face of the positioning ring along the axial direction. The at least one groove is injected with an adhesive for engagement between the outer peripheral face of the positioning ring and the inner peripheral face of the lens mount.
To achieve the above and other objects, the present invention also provides a lens mount. The lens mount is cylinder-shaped and has an inner peripheral face. A receiving space is enclosed by the inner peripheral face for receiving at least one optical element. The lens mount has a first end and a second end along an axial direction thereof The inner peripheral face has a positioning section near the first end. The positioning section is adapted for an outer peripheral face of the at least one optical element to contact and connect. The positioning section has at least one groove. The at least one groove is open at an end thereof near the first end of the lens mount. The at least one groove has a length along the axial direction smaller than a length of the outer peripheral face of the at least one optical element along the axial direction. The at least one groove is adapted for being injected with an adhesive for engagement between the outer peripheral face of the at least one optical element and the inner peripheral face of the lens mount.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
Please refer to
The lens mount 10,10a,10b,10c,10d is cylinder-shaped and has an inner peripheral face. A receiving space is enclosed by the inner peripheral face. The lens mount 10,10a,10b,10c,10d has a first end 11 and a second end 12 along an axial direction thereof The inner peripheral face has a positioning section 13,13a,13b,13c,13d near the first end 11. The at least one lens 20 is arranged in the receiving space. An outer peripheral face of the at least one lens 20 contacts the inner peripheral face of the lens mount 10,10a,10b,10c,10d. The positioning ring 30,30a is arranged in the receiving space. An outer peripheral face 31,31a of the positioning ring 30,30a is connected to the positioning section 13,13a,13b,13c,13d of the lens mount 10,10a,10b,10c,10d to prevent the at least one lens 20 om falling out via the first end 11 of the lens mount 10,10a,10b,10c,10d. An end of at least one of the positioning section 13,13a,13b,13c,13d and the outer peripheral face 31,31a of the positioning ring 30,30a near the first end 11 is formed with at least one groove 14,32,14b,14c,14d. The at least one groove 14,32,14b,14c,14d is open toward the first end 11. A length of the at least one groove 14,32,14b,14c,14d along the axial direction is smaller than a length of the outer peripheral face 31,31a of the positioning ring 30,30a along the axial direction. The at least one groove 14,32,14b,14c,14d is injected with an adhesive 40 for engagement between the outer peripheral face 31,31a of the positioning ring 30,30a and the inner peripheral face of the lens mount 10,10a,10b,10c,10d. Preferably, the at least one groove 14,32,14b,14c,14d has a depth H1,H2,H3,H4 along a radial direction of the lens mount 10,10a,10b,10c,10d ranged between 2 micrometers to 300 micrometers. The present invention also provides a lens mount 10,10b,10c,10d. The lens mount 10,10b,10c,10d is cylinder-shaped and has an inner peripheral face. A receiving space is enclosed by the inner peripheral face for receiving at least one optical element (such as a lens, a spacer, or a positioning ring). The lens mount 10,10b,10c,10d has a first end 11 and a second end 12 along an axial direction thereof The inner peripheral face has a positioning section 13,13a,13c,13d near the first end 11. The positioning section 13,13a,13c,13d is adapted for an outer peripheral face of the at least one optical element to contact and connect. The positioning section 13,13a,13c,13d has at least one groove 14,14b,14c,14d. The at least one groove 14,14b,14c,14d is open at an end thereof near the first end 11 of the lens mount 10,10b,10c,10d. The at least one groove 14,14b,14c,14d has a length along the axial direction smaller than a length of the outer peripheral face of the at least one optical element along the axial direction. The at least one groove 14,14b,14c,14d is adapted for being injected with an adhesive 40 for engagement between the outer peripheral face of the at least one optical element and the inner peripheral face of the lens mount 10, 10b,10c,10d.
In the present embodiment, the at least one groove 14,32,14b,14c,14d extends around the axial direction to be annular-shaped. In addition, the at least one groove 14,32,14b,14c,14d is enclosed by a lateral wall 142,142b,142c,142d and a bottom face 141,141b,141c,141d. The bottom face 141,141b,141c,141d is connected to a side of the lateral wall 142,142b,142c,142d near the second end 12. Specifically, the lateral wall 142,142b,142c,142d of the at least one groove 14,32,14b,14c,14d includes a bottom section 1421,1421b,1421c,1421d and a top section 1422,1422b,1422c,1422d aligned along the axial direction. The bottom section 1421,1421b,1421c,1421d is connected to the bottom face 141,141b,141c,141d. The top section 1422,1422b,1422c,1422d is located at a side of the bottom section 1421,1421b,1421c,1421d remote from the bottom face 141,141b,141c,141d. An inner diameter of the top section 1422,1422b,1422c,1422d is increasing toward the first end 11. For example, the top section 1422 can have a radial cross-section which is convex arc-shaped, as shown in
Please refer to
More preferably, the axial length L1,L2,L3,L4,L5,L6,L7,L8 of each of the bottom section 1421,1421b,1421c,1421d and the top section 1422,1422b,1422c,1422d is ranged from 2 micrometers to 300 micrometers. Specifically, in the present embodiment, the groove 14,14b,14c,14d is formed on the lens mount 10. However, as shown in
In conclusion, the groove of the present invention can be used to receive adhesive for engagement between the positioning ring and the lens mount. Because the groove doesn't extend beside the lens, the adhesive may not reach the lens. Besides, there is no groove formed on the outer peripheral face of the positioning ring near the second end so that the positioning ring and the lens mount have a large contact area to fix them firmly.
