TWI468768B - The lens barrel of the fixed focus lens and the assembly method of the lens barrel group - Google Patents

Description

Tube barrel set of fixed focus lens and assembly method of the barrel group

The present invention relates to a fixed focus lens, and more particularly to a lens barrel set of a fixed focus lens and a method of assembling the fixed focus lens.

Referring to the first figure, the lens barrel assembly 10 of the conventional fixed focus lens includes a front lens barrel 12 and a rear lens barrel 14 which are formed by plastic injection, and the internal portions thereof are respectively used to set a front group lens group and a rear group. Group lens group. The rear end of the front barrel 12 has a recess 122 and six circular holes 124 disposed on the bottom surface of the recess 122 and equally spaced. The rear barrel 14 has an annular tenon 142 and three counterbores 144 extending through the annular tenon 142 and equally spaced. The front barrel 12 and the rear barrel 14 are fixed to each other by three self-tapping screws 16 passing through the counterbore holes 144 and screwed to the three circular holes 124, respectively.

In the aligning process of the aforementioned lens, when the resolution of the resolution of the lens is not good, the front and rear barrels 12, 14 must be separated from each other and then rotated relative to each other, and then, after being locked again, the resolution is detected again; in other words, These screws 16 may be disassembled multiple times and repeatedly locked in the same circular hole 124, and the circular holes 124 and the counterbore holes 144 are not easily aligned, so the alignment process of the lens is quite time consuming. In addition, the angle of the lens is quite large (minimum 60 degrees), so it is not easy to adjust to the optimal angle. Furthermore, the plastic swarf generated by the tapping of the front lens barrel 12 by the tapping screw 16 may accumulate on the contact faces of the front and rear lens barrels 12 and 14 to affect the flatness. The degree of uniformity leads to poor lens resolution, which in turn reduces the production yield of the lens.

In view of the above-mentioned deficiencies, the main object of the present invention is to provide a lens barrel set of a fixed focus lens, and a method of assembling a fixed focus lens using the lens barrel group, which can save time for adjusting the focus of the fixed focus lens.

To achieve the above objective, the lens barrel assembly of the fixed focus lens of the present invention comprises a first lens barrel, a second lens barrel and a fixing member, the first lens barrel having a first central axis and at least one first a positioning portion, the second lens barrel has a second central axis and a plurality of second positioning portions, wherein the second lens barrel is disposed on the second central axis coincident with the first central axis of the first lens barrel a first lens barrel, at least one of the second positioning portions is engaged with the first positioning portion of the first lens barrel, the fixing member is disposed on the first lens barrel and the second lens barrel, so that The first barrel and the second barrel are fixed to each other.

In addition, the method for assembling a fixed-focus lens provided by the present invention includes the following steps: a) providing a first lens barrel and a second lens barrel of a certain focal length lens, the first lens barrel having a first central axis and a first a first positioning portion, the second lens barrel has a second central axis and a plurality of second positioning portions; b) the second lens barrel is overlapped with the first central axis of the first lens barrel by the second central axis In the first lens barrel, the first positioning portion of the first lens barrel is embedded in at least one of the second positioning portions of the second lens barrel, so that the first lens barrel and the second lens barrel are mutually Positioning; c) detecting the resolution of the fixed focus lens, if the resolution is less than a standard value, performing step d), if the resolution is greater than or equal to a standard value, Step e); d) separating the first barrel from the second barrel and rotating relative to a predetermined angle, and then performing step b) and step c) again; and e) setting a fixing member to the first The lens barrel and the second barrel are such that the first barrel and the second barrel are fixed to each other.

Thereby, during the alignment process, the first and second lens barrels are not fixed by the fixing member first, thereby saving time for disassembling and mounting the fixing member (for example, a screw); The first and second lens barrels can be quickly positioned by the first and second positioning portions being embedded, thereby saving the time required for the lens alignment process.

Another object of the present invention is to provide a lens barrel set of a fixed focus lens, and a method of assembling a fixed focus lens using the lens barrel group, which can make the fixed focus lens easier to adjust to an optimum angle.

In order to achieve the above object, in the assembly method of the lens barrel group and the fixed focus lens of the fixed focus lens provided by the present invention, the second positioning portion of the second lens barrel equidistantly surrounds the second central axis, and The distance between the adjacent second positioning portions is smaller than the width of the second positioning portion. Thereby, the second lens barrel has a considerable number of second positioning portions, and therefore, the lens alignment angle of the lens is relatively small, so that it can be easily adjusted to an optimum angle.

Still another object of the present invention is to provide a lens barrel set of a fixed focus lens and an assembly method of the fixed focus lens using the lens barrel group, which can prevent the debris generated by the assembly process from affecting the lens resolution effect.

In order to achieve the above object, in the assembly method of the lens barrel group and the fixed focus lens of the fixed focus lens provided by the present invention, the first positioning portion of the first lens barrel The second column of the second lens barrel is a groove, and the fixing member is a screw that passes through the groove and is screwed to the locking hole. Thereby, the dander generated by the tapping of the first lens barrel does not accumulate on the contact surface of the first and second lens barrels, and thus does not affect the resolution effect of the lens.

The detailed construction, features, assembly or use of the lens barrel assembly of the fixed focus lens provided by the present invention and the fixed focus lens using the lens barrel will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

The technical content and features of the present invention will be described in detail below with reference to the accompanying drawings, wherein: FIG. 2 is a lens barrel of a fixed-focus lens according to a first preferred embodiment of the present invention. The third embodiment is a perspective exploded view of a lens barrel set of the fixed focus lens provided by the first preferred embodiment of the present invention; and the fourth figure is provided by the first preferred embodiment of the present invention. A cross-sectional view of a lens barrel set of a fixed focus lens; a fifth view of the lens barrel set of the fixed focus lens provided by the first preferred embodiment of the present invention, wherein the three fixed parts of the lens barrel group are removed For the purpose of illustration; and the sixth figure is a fixed focus lens provided by a second preferred embodiment of the present invention. An end view of the lens barrel set, wherein the two fastener elements of the lens barrel set are removed for illustration.

The Applicant first describes the same or similar elements or structural features thereof in the embodiments and the drawings which will be described below.

Please refer to the second and third figures. The lens barrel assembly 20 of the fixed focus lens according to the first preferred embodiment of the present invention includes a first lens barrel 30, a second lens barrel 40, and three Screw fixing member 50.

The first lens barrel 30 has a recess 32 recessed from one end surface thereof, and three protrusions 34 located in the recess 32, and the first central axis of the protrusions 34 and the first barrel 30 The vertical distances of the L1 are the same, and each of the protrusions 34 is provided with a locking hole 342.

The second lens barrel 40 has a plurality of grooves 42 that can be fitted into the protrusions 34 of the first barrel 30, and the vertical distance between the grooves 42 and the second central axis L2 of the second barrel 40 The same. In detail, the second lens barrel 40 has an annular tenon 44 having a first surface 441 and a second surface 442 opposite to each other, and an outer peripheral surface 444 (such as the fourth figure). Each of the grooves 42 is recessed inwardly from the outer peripheral surface 444 and penetrates the first surface 441 and the second surface 442.

The assembly method using the aforementioned fixed focus lens of the lens barrel set 10 includes the following steps:

a) The first barrel 30 and the second barrel 40 are provided. At this time, a front group lens group and a rear group lens group (not shown) are respectively disposed in the first and second barrels 30, 40.

b) as shown in FIG. 5, the second lens barrel 40 is disposed on the first lens barrel 30 with the second central axis L2 coincident with the first central axis L1 of the first lens barrel 30, so that the first The boss 34 of the lens barrel 30 is embedded with the three recesses 42 of the second barrel 40 to position the two barrels 30, 40 with each other.

c) detecting the resolution of the fixed focus lens, if the resolution is less than a standard value, performing step d), if the resolution is greater than or equal to a standard value, proceeding to step e).

d) separating the first barrel 30 from the second barrel 40 and rotating it relative to each other by a predetermined angle, and then performing step b) and step c) again. In the present embodiment, the grooves 42 are equidistantly surrounding the second central axis L2, and the distance between the adjacent grooves 42 is smaller than the width of the groove 42, whereby the second barrel 40 has a considerable The plurality of grooves 42 can be re-inserted with the first barrel 30 by at least 15 degrees of rotation. Therefore, the predetermined angle can be a multiple of 15.

e) The fixing members 50 are disposed on the first barrel 30 and the second barrel 40 such that the first barrel 30 and the second barrel 40 are fixed to each other. That is, the screws 50 are passed through the recesses 42 and screwed to the locking holes 342 of the studs 34 until the heads 52 of the screws 50 abut against the second surface 442 of the annular collar 44 (eg, Four figures).

Therefore, during the aligning process, that is, the steps c) and d), the two barrels 30 and 40 are not fixed by the fixing members 50, thereby saving the disassembly and loading. The time of the fixture 50. Moreover, the two barrels 30, 40 can be quickly positioned by being embedded in the recesses 34, so It also saves the time required for the lens alignment process. In addition, the second barrel 40 has a relatively large number of grooves 42 so that the angle of alignment of the lens is relatively small, so that it can be easily adjusted to an optimum angle.

It is worth mentioning that each of the lens barrels 30, 40 can be injection molded from plastic, and each of the locking holes 342 has no thread, and the teeth are simultaneously tapped when the screws 50 are locked, and the generated chips are not generated. It will accumulate on the contact surface of the two barrels 30, 40 (for example, the first surface 441 of the annular projection 44), so that the resolution of the lens is not affected. In this embodiment, the distance between the first and second surfaces 441 and 442 of the second lens barrel 40, that is, the thickness of the annular tenon 44 is greater than the length of the stud 34, and the screw 50 is locked. There is still a distance between the head 52 and the stud 34 (as shown in the fourth figure). Therefore, the shavings do not affect the concentricity of the screw 50 and the locking hole 342, and can be further avoided. Affects the resolution of the lens.

As shown in the sixth embodiment, the first lens barrel 70 of the lens barrel set 60 of the fixed focus lens provided by the second preferred embodiment of the present invention has only two protrusions 74, and the two protrusions 74 are located at the first The opposite side of the first central axis (not shown) of a lens barrel 70; thereby, the lens barrel set 60 can also achieve the effect of the lens barrel set 10, and the required set of the lens barrel set 60 is fixed. There are fewer pieces (not shown).

The main purpose of the present invention is to enable the first lens barrel 30 and the second lens barrel 40 of the fixed-focus lens to have a first positioning portion and a second positioning portion (such as the protrusions 34 and the grooves 42) that can be fitted to each other, so that the During the aligning process, the two barrels 30, 40 can be temporarily positioned relative to each other, so that they can be quickly separated, rotated relatively, and then mutually fitted and positioned until the adjustment is made to the maximum. After the relative angle is good, the two lens barrels 30 and 40 are fixed to each other by using the fixing member, thereby achieving the effect of saving the core time. Therefore, the first positioning portion 34 of the first lens barrel 30 and the second positioning portion 42 of the second lens barrel 40 may also be grooves and protrusions, respectively, and the grooves may not be semi-circular, and The system is in the shape of a complete round hole. In addition, the number of the first and second positioning portions 34, 42 may be a single number and a plural number; or, as in the foregoing embodiment, the number of the first and second positioning portions 34, 42 is plural, in this case, The number of the two may be the same or different, and there is no limit to what is more or less. However, as in the foregoing embodiment, the number of the grooves is quite large, and the number of the protrusions only achieves the effect of positioning, and not only the angle of the adjustment of the lens is relatively small and varied, but only a small amount of screws need to be locked. . Furthermore, the fixing member for fixing the two lens barrels to each other is not limited to the screw, and is not limited to the first and second positioning portions.

Finally, it is to be noted that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention, and alternative or variations of other equivalent elements should also be the scope of the patent application of the present application. Covered.

[Prior technology]

10‧‧‧Mirror tube set

12‧‧‧ front tube

122‧‧‧ Groove

124‧‧‧ round hole

14‧‧‧ Rear tube

142‧‧‧ ring crown

144‧‧‧ countersunk hole

16‧‧‧ Self-tapping screws

[Examples]

20‧‧‧Steel tube set for fixed-focus lens

30‧‧‧ first lens barrel

32‧‧‧ Groove

34‧‧‧Postle column (first positioning part)

342‧‧‧Lock hole

L1‧‧‧ first central axis

40‧‧‧second lens barrel

42‧‧‧ Groove (second positioning part)

44‧‧‧ annular crown

441‧‧‧ first surface

442‧‧‧ second surface

444‧‧‧ outer perimeter

L2‧‧‧ second central axis

50‧‧‧Fixed parts (screws)

52‧‧‧ head

60‧‧‧Steel tube set for fixed-focus lens

70‧‧‧ first lens barrel

74‧‧‧Postle column (first positioning part)

The first figure is an exploded perspective view of a lens barrel set of a conventional fixed focus lens; the second figure is a three-dimensional combination view of the lens barrel group of the fixed focus lens according to a first preferred embodiment of the present invention; An exploded perspective view of a lens barrel set of the fixed focus lens provided by the first preferred embodiment of the present invention; and a fourth view of the lens barrel set of the fixed focus lens provided by the first preferred embodiment of the present invention; 5 is an end view of a lens barrel set of the fixed focus lens according to the first preferred embodiment of the present invention, wherein the three fixing members of the lens barrel set are removed for explanation; and the sixth figure is the present invention. An end view of a lens barrel set of a fixed focus lens provided by a second preferred embodiment, wherein the two fastener elements of the lens barrel set are removed for illustration.

20‧‧‧Steel tube set for fixed-focus lens

30‧‧‧ first lens barrel

32‧‧‧ Groove

34‧‧‧Postle column (first positioning part)

342‧‧‧Lock hole

L1‧‧‧ first central axis

40‧‧‧second lens barrel

42‧‧‧ Groove (second positioning part)

44‧‧‧ annular crown

L2‧‧‧ second central axis

50‧‧‧Fixed parts (screws)

Claims (9)

A lens barrel assembly of a fixed focus lens includes: a first lens barrel having a first central axis and at least one first positioning portion; and a second lens barrel having a second central axis and a plurality of second positioning portions The second lens barrel is disposed on the first lens barrel with the second central axis coincident with the first central axis of the first lens barrel, and at least one of the second positioning portions and the first mirror The first positioning portion of the cylinder is fitted to each other; the second lens barrel has an annular tenon having a first surface and a second surface, and an outer peripheral surface, each of the second The positioning portion is a groove recessed from the outer circumferential surface and penetrating the first surface and the second surface; and a fixing member is disposed on the first barrel and the second barrel, so that the first mirror The cylinder and the second barrel are fixed to each other. The lens barrel group of the fixed focus lens of claim 1, wherein the second positioning portion has the same vertical distance from the second central axis of the second lens barrel. The lens barrel set of the fixed focus lens of claim 1, wherein the second positioning portions equidistantly surround the second central axis of the second lens barrel and adjacent to the second positioning The distance of the portion is smaller than the width of the second positioning portion. The lens barrel set of the fixed focus lens of claim 1, wherein the first lens barrel has a plurality of the first positioning portions, the first positioning portions and the first central axis of the first lens barrel The vertical distance is the same. The lens barrel set of the fixed focus lens of claim 1, wherein the first positioning portion of the first barrel is a protrusion. The lens barrel assembly of the fixed focus lens of claim 5, wherein the first positioning portion of the first lens barrel is provided with a locking hole, and the fixing member is screwed through the second positioning portion. a screw for the locking hole of the first positioning portion. The lens barrel set of the fixed focus lens of claim 5, wherein the distance between the first surface of the second barrel and the second surface is greater than the length of the protrusion. A method for assembling a fixed-focus lens includes the following steps: a) providing a first lens barrel and a second lens barrel of a certain focal length lens, the first lens barrel having a first central axis and a first positioning portion, The second lens barrel has a second central axis and a plurality of second positioning portions; the first positioning portion of the first lens barrel is a protrusion, and the protrusion column is provided with a locking hole, and the second lens barrel is The second positioning portion is a groove; b) the second lens barrel is disposed on the first lens barrel with the second central axis coincident with the first central axis of the first lens barrel, such that the first Engaging at least one of the first positioning portion of the lens barrel and the second positioning portion of the second lens barrel to position the first lens barrel and the second lens barrel; c) detecting the fixed focus The resolution of the lens, if the resolution is less than a standard value, performing step d), if the resolution is greater than or equal to a standard value, performing step e); d) making the first barrel and the second The lens barrel is separated and relatively rotated by a predetermined angle, and then step b) and step c) are performed again; e) a fixing member is disposed in the locking hole of the first lens barrel, the fixing member is a screw passing through the groove and screwed to the locking hole, so that the first lens barrel and the second mirror The cylinders are fixed to each other. The method of assembling a fixed-focus lens according to claim 8, wherein the second positioning portion of the second lens barrel equidistantly surrounds the second central axis and the distance between the adjacent second positioning portions It is smaller than the width of the second positioning portion.