TWI404988B - Can reduce the height of the lens device - Google Patents

Abstract

The lens apparatus capable of lowering height of the present invention includes a lens barrel and a first lens. The lens barrel includes a surrounding wall installed along an axial line, a top wall connecting with the upper edge of the surrounding wall, and plural focus adjustment slots formed on the exterior of the top wall. The top wall possesses an inner ring bottom face and an outer ring bottom face surrounding the inner ring bottom face wherein the height of the outer ring bottom is lower. The distance between the inner faces of the focus adjustment slots and the axial line is defined as a radial distance of the focus adjustment slot. The first lens has an effective radial region installed at the axial line and a support region surrounding the effective radial region. The support region has an inner circle top face and an outer circle top face respectively corresponded to the bottom faces of the inner ring and the outer ring. The distance between the outer face of said first lens and the axial line is defined as a first radius. By having the focus adjustment slot radial distance larger than the first radius, and to have both the lens barrel top wall and the first lens formed in stepwise shape, the heights of the focus adjustment slot and the first lens are partially overlapped along the axial direction so that the overall height is reduced.

Description

Lens device capable of reducing height

The present invention relates to a lens, and more particularly to a lens device capable of reducing the height.

In order to develop miniaturization of cameras and mobile phones, the lens has also become a trend toward miniaturization.

Referring to FIGS. 1 and 2, a conventional lens device 1 includes a lens barrel 11 and a lens unit 12 mounted in the lens barrel 11. The lens barrel 11 includes a ring wall 111 disposed about an axis L, a top wall 113 connecting the top edge of the ring wall 111 and surrounding a ring hole 112, and a plurality of focusing holes formed on the top wall 113. The groove 114 has a focusing groove inner surface 115 disposed along the axis L direction and a focusing end surface 116 perpendicular to the inner surface 115 of the focusing groove. The lens unit 12 includes a first lens 121 adjacent to the aperture hole 112. The first lens 121 has a pair of effective diameter regions 122 that should be the aperture holes 112, and a bearing area 123 surrounding the effective diameter region 122. The effective diameter region 122 has a bottom end surface 124 disposed toward the imaging end. The bearing area 123 has an outer ring top surface 125 disposed toward the object end, and an outer ring bottom surface 126 disposed opposite the outer ring top surface 125. . Defining the bottom end surface 124 at the axis L is the bottom end center point C, and the bottom end center point C height is lower than the bearing area 123 outer ring bottom surface 126 height, so the effective diameter area 122 is away from the top surface of the lens barrel 11 The reserved distance is greater than the required reserved distance, and the overall height of the lens device 1 is increased.

The vertical distance between the inner surface 115 of the focusing groove and the axis L is defined as the pitch d of the focusing groove, and the distance between the outer circumferential surface of the first lens 121 and the axis L is the first radius Φ1, wherein the focusing grooves The inward depth of the 114 is deeper, that is, the focal length d of the focusing slot is smaller than the first radius Φ1, so the height of the focusing stop surface 116 must be greater than the outer surface top surface 125 of the first lens 121 to enable the mirror. The top wall 113 of the barrel 11 has a sufficient flesh thickness, which in turn increases the overall height of the lens unit 1.

Accordingly, it is an object of the present invention to provide a lens device capable of reducing the height.

Thus, the present invention can reduce the height of the lens device, including a lens barrel and a lens unit. Defining an object end and an imaging end at opposite ends of an axis, the lens barrel includes a ring wall disposed around the axis, a top wall connected to the top edge of the ring wall and surrounding a ring aperture, and a plurality of spaced apart from each other a focusing groove on the outer peripheral surface of the top wall, the inner circumferential mask of the annular wall has a small diameter section disposed along the axial direction, and a large diameter section disposed along the axial direction near the imaging end of the small diameter section, The small diameter section and the large diameter section are in a class shape, and the diameter of the large diameter section is larger than the diameter of the small diameter section, the bottom surface of the top wall has a bottom surface of the inner ring surrounding the aperture hole, and a periphery surrounding the bottom surface of the inner ring a bottom surface of the outer ring, the bottom surface of the inner ring and the bottom surface of the outer ring are in a class shape, and the height of the bottom surface of the inner ring is higher than the bottom surface of the outer ring, and each focusing groove has an inner surface of the focusing groove disposed along the axial direction, and A vertical focusing surface of the focusing groove defines a vertical distance between the inner surface of each focusing groove and the axis as a focusing groove pitch. The lens unit is mounted in the lens barrel, and includes a first lens and a second lens sequentially from the object end to the imaging end along the axis, the first lens is received in the small diameter section of the ring wall of the lens barrel. And the second lens is received in the large diameter section of the ring wall, the first lens has a pair of effective diameter regions in which the aperture hole is disposed on the axis, and a bearing area surrounding the effective diameter zone, the bearing The contact area has a pair of inner ring top surfaces which should be the bottom surface of the inner ring, and a pair of outer ring top surfaces which should be the bottom surface of the outer ring, the top surfaces of the inner and outer rings are in a class shape, and the height of the top surface of the inner ring is higher than the The top surface of the outer ring defines a distance between the outer peripheral surface of the first lens and the axis as a first radius, and the length of the first radius is smaller than the pitch of the focusing groove.

The effect of the present invention is that the focal length of the focusing groove is greater than the first radius, and the top wall of the lens barrel and the first lens are both in a class shape, such that the focusing grooves and the first lens are along the axis direction. The heights are partially overlapped to reduce the overall height of the lens assembly.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 3 and FIG. 4, a preferred embodiment of the lens device capable of reducing the height of the present invention comprises a lens barrel 2, a lens unit 3 and a light shielding unit 4.

The lens barrel 2 is used for the lens unit 3 and the light shielding unit 4 to define an object end and an imaging end at opposite ends of an axis L'. The lens barrel 2 includes a ring wall 21 disposed around the axis L'. A top wall 23 connected to the top edge of the ring wall 21 and surrounding a diaphragm hole 22, and a plurality of focusing grooves 24 formed on the outer peripheral surface of the top wall 23 are spaced apart from each other.

The inner peripheral surface of the annular wall 21 has a small diameter section 211 disposed along the axis L', and a large diameter section 212 disposed along the axis L' of the small diameter section 211 near the imaging end, the small diameter The segment 211 and the large diameter segment 212 are in a class shape, and the large diameter segment 212 has a larger diameter than the small diameter segment 211.

The bottom surface of the top wall 23 has an inner ring bottom surface 231 surrounding the aperture 22 and an outer ring bottom surface 232 surrounding the outer circumference of the inner ring bottom surface 231. The inner and outer ring bottom surfaces 231, 232 have a class shape, and the height of the inner ring bottom surface 231 is higher than the height of the outer ring bottom surface 232.

Each focusing groove 24 has a focusing groove inner surface 241 disposed along the axis L' direction, and a focusing end surface 242 perpendicular to the focusing groove inner surface 241, defining each focusing groove inner surface 241 and The vertical distance of the axis L' is the focal length d' of the focusing groove.

The lens unit 3 is mounted in the lens barrel 2, and includes a first lens 31, a second lens 32, a third lens 33 and a fourth lens 34 along the axis L' from the object end to the imaging end.

The first lens 31 is received in the small diameter section 211 of the ring wall 21 of the lens barrel 2, and the second lens 32 is received in the large diameter section 212 of the ring wall 21.

The first lens 31 has a pair of effective diameter regions 311 in which the aperture holes 22 are disposed on the axis L', and a bearing region 312 surrounding the effective diameter regions 311.

The effective diameter region 311 has a bottom end surface 313 facing the second lens 32.

The bearing area 312 has a pair of inner ring top surfaces 314 which should be the inner ring bottom surface 231, a pair of outer ring top surfaces 315 which should be the outer ring bottom surface 232, and an outer ring bottom surface 316 which is disposed opposite the outer ring top surface 315. And an inclined inner ring bottom surface 317 between the bottom surface 316 of the outer ring and the bottom end surface 313 of the effective diameter region 311. The inner and outer ring top surfaces 314, 315 are in a class shape, and the inner ring top surface 314 has a height higher than the outer ring top surface 315. The inclined inner ring bottom surface 317 is inclined from the outer to the inner object end, and the outer ring bottom surface 316 and the oblique inner bottom surface 317 together serve the second lens 32.

The light shielding unit 4 includes a first light shielding film 41 sandwiched between the first lens 31 and the top wall 23 of the lens barrel 2 from the object end to the imaging end, and a second and third lens 32, 33 A second light shielding sheet 42 and a third light shielding sheet 43 interposed between the third and fourth lenses 33 and 34.

Defining that the distance between the outer peripheral surface of the first lens 31 and the axis L′ is a first radius Φ1′, the length of the first radius Φ1′ is smaller than the pitch d′ of the focusing slot, and in the preferred embodiment, The height of the focusing surface 242 of the focusing lens 24 is lower than the outer surface top surface 315 of the bearing area 312 of the first lens 31, that is, the focusing grooves 24 are disposed on the outer circumference of the first lens 31, so that the The ring wall 21 and the top wall 23 of the lens barrel 2 effectively reduce the overall height of the lens device in the case of having a sufficient flesh thickness.

The bottom end surface 313 of the effective diameter region 311 is defined as the bottom end center point C' at the axis L'. In the preferred embodiment, the outer ring bottom surface 316 of the bearing area 312 is lower than the effective diameter area 311. The bottom end center point C', that is, the effective diameter area 311 of the first lens 31 is pushed toward the object end, effectively reducing the overall thickness of the lens device.

Defining that the distance between the second lens 32 and the axis L′ is the second radius Φ2, the length of the first radius Φ1′ of the first lens 31 is smaller than the second radius Φ2 of the second lens 32, by the first radius Φ1′ Smaller, it is possible to provide a sufficient thickness of the ring wall 21 of the lens barrel 2 to maintain the structural strength of the lens barrel 2.

In summary, the overall height of the lens device is reduced by adjusting the arrangement relationship between the components, and the thickness of the top wall 23 and the ring wall 21 of the lens barrel 2 is taken into consideration while the relative relationship is adjusted. The focusing grooves 24 are disposed on the outer circumference of the first lens 31, so that the focusing grooves 24 partially overlap the height of the first lens 31 in the direction of the axis L′, and the top wall 23 of the lens barrel 2 The first lenses 31 are all in a class shape to lower the height of the lens device.

In addition, the height of the outer ring bottom surface 316 of the first lens 31 bearing area 312 is lower than the bottom end center point C' of the effective diameter area 311, so that the effective diameter area 311 is raised as high as possible to minimize the mirror. The distance between the top surface of the top wall 23 of the cylinder 2 and the effective diameter region 311 is such that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2. . . Lens barrel

twenty one. . . Ring wall

211. . . Small diameter section

212. . . Large diameter section

twenty two. . . Aperture hole

twenty three. . . Top wall

231. . . Inner ring bottom

232. . . Outer ring bottom

twenty four. . . Focusing slot

241. . . Inside the focusing groove

242. . . Focusing stop

3. . . Lens unit

31. . . First lens

311. . . Effective area

312. . . Abutment area

313. . . Bottom end

314. . . Inner ring top

315. . . Outer ring top

316. . . Outer ring bottom

317. . . Inclined inner ring bottom

32. . . Second lens

33. . . Third lens

34. . . Fourth lens

4. . . Shading unit

41. . . First light shield

42. . . Second light shield

43. . . Third light shield

L’. . . Axis

D’. . . Focusing groove pitch

Φ1’. . . First radius

Φ2. . . Second radius

C’. . . Bottom end point

Figure 1 is an exploded perspective view showing a conventional lens device;

Figure 2 is a cross-sectional side view showing the assembly relationship and overall height of the conventional lens device;

Figure 3 is a view similar to Figure 1 illustrating a preferred embodiment of the lens assembly of the present invention capable of reducing the height; and

Figure 4 is a view similar to Figure 2 illustrating the assembly relationship and overall height of the preferred embodiment.

2. . . Lens barrel

twenty one. . . Ring wall

211. . . Small diameter section

212. . . Large diameter section

twenty two. . . Aperture hole

twenty three. . . Top wall

231. . . Inner ring bottom

232. . . Outer ring bottom

twenty four. . . Focusing slot

241. . . Inside the focusing groove

242. . . Focusing stop

31. . . First lens

311. . . Effective area

312. . . Abutment area

313. . . Bottom end

314. . . Inner ring top

315. . . Outer ring top

316. . . Outer ring bottom

317. . . Inclined inner ring bottom

32. . . Second lens

33. . . Third lens

34. . . Fourth lens

41. . . First light shield

42. . . Second light shield

43. . . Third light shield

L’. . . Axis

D’. . . Focusing groove pitch

Φ1’. . . First radius

Φ2. . . Second radius

C’. . . Bottom end point

Claims (5)

A lens device capable of reducing height comprises: a lens barrel defining an object end and an imaging end at opposite ends of an axis, comprising a ring wall disposed around the axis, a ring edge connected to the ring wall and defining an aperture around the ring wall a top wall of the hole, and a plurality of focusing grooves spaced apart from each other on the outer peripheral surface of the top wall, the inner peripheral surface of the ring wall has a small diameter section disposed along the axial direction, and a small diameter section disposed along the axis direction The diameter section is adjacent to the large diameter section at the imaging end, the small diameter section and the large diameter section are in a class shape, and the diameter of the large diameter section is larger than the diameter of the small diameter section, and the bottom surface of the top wall has an inner ring surrounding the aperture hole. a bottom surface, and a bottom surface of the outer ring surrounding the outer circumference of the bottom surface of the inner ring, the bottom surface of the inner ring and the bottom surface of the outer ring are in a class shape, and the height of the bottom surface of the inner ring is higher than the height of the bottom surface of the outer ring, and each focusing groove has an edge The inner surface of the focusing groove disposed in the axial direction, and a focusing end surface perpendicular to the inner surface of the focusing groove, defining a vertical distance between the inner surface of each focusing groove and the axis as a focusing groove pitch; and a lens a unit mounted in the barrel along the axis from the object end to imaging The first lens and the second lens are sequentially disposed in the small diameter section of the ring wall of the lens barrel, and the second lens is received in the large diameter section of the ring wall. An lens has a pair of effective diameter regions in which the aperture hole is disposed on the axis, and a bearing area surrounding the effective diameter region, the bearing region has a pair of inner ring top surfaces which should be the bottom surface of the inner ring, and a pair of should The top surface of the outer ring bottom surface, the top surface of the inner and outer rings is in a class shape, and the height of the top surface of the inner ring is higher than the top surface of the outer ring, and the distance between the outer peripheral surface of the first lens and the axis is defined as a radius, the length of the first radius being less than the pitch of the focusing slot. The lens device of claim 1, wherein the effective diameter of the first lens has a bottom end surface facing the second lens, and the bottom end surface is defined at the center of the bottom end. The bearing area of the first lens further has a bottom surface of the outer ring disposed opposite to the top surface of the outer ring, and a height of the bottom surface of the outer ring is lower than a center point of the bottom end surface of the effective diameter area. The lens device according to the second aspect of the invention, wherein the bearing area of the first lens further has a bottom surface of the inclined inner ring between the bottom surface of the outer ring and the bottom end surface of the effective diameter region, The bottom surface of the inclined inner ring is inclined from the outer to the inner end, and the bottom surface of the outer ring and the bottom surface of the inclined inner ring cooperate with the second lens. The lens device capable of reducing the height according to claim 1, wherein the focusing surface of the focusing groove is lower than the top surface of the outer ring of the first lens bearing area. The lens device of claim 1, wherein the lens unit further includes a third lens located at an end of the second lens near the imaging end from the object end to the imaging end, and a The third lens is adjacent to the fourth lens at the imaging end, and the lens device further comprises a light shielding unit, the light shielding unit sequentially includes a first surface of the first lens and the top wall of the lens barrel from the object end to the imaging end. a light shielding film, a second light shielding film sandwiched between the second and third lenses, and a third light shielding film sandwiched between the third and fourth lenses.