TWM519246U - Optical imaging system and lens fixing module thereof - Google Patents

Description

Optical imaging system and lens fixing module thereof

The present invention relates to an optical imaging system and a lens fixing module thereof; in particular, an optical imaging system having an integrally formed tubular portion and a base and a lens fixing module thereof.

Optical imaging systems typically include a lens, a lens barrel, and a lens holder. The lenses are used for optical imaging. The lens barrel is usually a cylindrical body in which a lens can be housed. Moreover, the outer wall of the lens barrel is provided with an external thread, and the lens holder has a receiving hole for receiving the lens barrel, and the hole wall is provided with an internal thread matched with the external thread of the lens barrel. . When assembling the lens module, the lens assembly is first loaded into the lens barrel, and the lens barrel is screwed into the lens holder by screwing, thereby completing the assembly of the lens module.

However, the prior optical imaging system has more components, so the accuracy of each component is higher when forming each component, in order to maintain the imaging quality of the optical imaging system, and in addition, the components are more, resulting in the optical imaging system. The volume and weight are also large, and it is not suitable for the trend of miniaturization, thinning and thinning of electronic products, and the use of the external internal thread to be screwed in is easy to affect the optical efficiency due to the tolerance of the internal and external threads.

In view of this, the purpose of the present invention is to provide an optical imaging system and a lens fixing module that can be miniaturized and thinned.

In order to achieve the above object, an optical imaging system provided by the present invention comprises an image sensing module, a lens fixing module, at least one lens and an aperture. The image sensing module includes a substrate and an image sensor disposed on the substrate. The lens fixing module includes a base and a lens holder; the base has an open accommodating space, and is disposed on the substrate such that the image sensor is located in the accommodating space; the lens holder is hollow, and Having a tubular portion and a base portion integrally formed and connected to each other, and the mirror holder has a first through hole and a second through hole at opposite ends, the first through hole communicating with the cylindrical portion and the second through hole communicating The base portion, and the length of the largest diagonal of the second through hole is greater than 0.6 times the distance of the maximum diagonal of the effective sensing area of the image sensor; in addition, the lens holder is disposed on the base to shield The accommodating space is not in contact with the substrate, and the base is connected to the base. In addition, a gap between the lens holder and the base in a focusing operation range perpendicular to the predetermined optical axis is the optical imaging system. 2.0 times the depth of focus. The lens is disposed in the barrel and is adjacent to the first perforation than the image sensor and is facing the image sensor. The aperture is disposed in the barrel

In order to achieve the above objectives, the present invention provides an optical lens fixing module comprising a base and a mirror base. The base has an open accommodating space. The lens holder is hollow and has a cylindrical portion and a base portion which are integrally formed and communicate with each other, and the mirror holder has a first through hole and a second through hole at opposite ends, the first through hole is connected to the mirror hole The cylindrical portion and the second through hole communicate with the base portion; further, the lens holder is disposed on the base to shield the accommodating space, and the base portion is connected to the base, and the first through hole and the second through hole communicate with the accommodating portion The space is disposed and the second through hole is closer to the accommodating space than the first hole.

The lens fixing module has a predetermined optical axis vertically passing through the second through hole, and a matching tolerance of the gap between the lens holder and the base in a direction parallel to the predetermined optical axis is 0.01 to 0.3 mm. In addition, the gap between the lens holder and the base in the direction perpendicular to the predetermined optical axis is 2.0 times the focal depth of the optical imaging system.

The effect of the present invention is to reduce the number of components by the design of the tubular portion and the base portion which are integrally formed and communicated with each other, and to achieve miniaturization and slimming, and further, since the tubular portion and the base portion are integrally formed, Temperature changes The entire structure is not easily deformed to maintain the imaging quality of the optical imaging system.

[this creation]

100‧‧‧Optical imaging system

10‧‧‧Image Sensing Module

12‧‧‧Substrate

14‧‧‧Image sensor

20‧‧‧Lens fixing module

22‧‧‧ Tube

22a‧‧‧First perforation

22b‧‧‧Second perforation

24‧‧‧ base

26‧‧‧Base

26a‧‧‧ accommodating space

30‧‧‧ lenses

40‧‧‧ aperture

50‧‧‧Combined means

52‧‧‧First ring tooth set

52a‧‧‧ bottom

52b‧‧‧ side wall

53a‧‧‧ gap

53b‧‧‧ gap

54‧‧‧second ring tooth set

54a‧‧‧ top

54b‧‧‧Upright wall

60‧‧‧ Inter-mirror ring

Z1‧‧‧Preset optical axis

Z2‧‧‧ central axis

200‧‧‧ Optical Imaging System

32‧‧‧ lenses

62‧‧‧ spacer ring

70‧‧‧ combination means

72‧‧‧First sleeve

74‧‧‧Second sleeve

84‧‧‧ base

86‧‧‧Base

Z3‧‧‧Preset optical axis

300‧‧‧Optical imaging system

34‧‧‧ lenses

90‧‧‧ mirror base

92‧‧‧ base

92a‧‧‧ accommodating space

Z4‧‧‧Preset optical axis

Z5‧‧‧ central axis

A6‧‧‧ optical axis

1 is a perspective view of the optical imaging system of the first embodiment of the present invention.

Figure 2 is an exploded perspective view of the first embodiment described above.

Figure 3 is a cross-sectional view taken along line A-A of Figure 1.

Figure 4 is a perspective view of the optical imaging system of the second embodiment of the present invention.

Fig. 5 is an exploded perspective view of the second embodiment.

Figure 6 is a cross-sectional view taken along line B-B of Figure 4;

Figure 7 is a cross-sectional view showing the optical imaging system of the third embodiment of the present invention.

In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the accompanying drawings. Referring to FIG. 1 to FIG. 3, the optical imaging system of the first embodiment is created.

The optical imaging system 100 includes an image sensing module 10, a lens fixing module 20, a lens 30, an aperture 40, and a bonding means 50. Moreover, in designing the optical imaging system 100, a predetermined optical axis Z1 is defined, which is the axis that would ideally pass through the lens 30 and the center of the aperture 40.

The image sensing module 10 includes a substrate 12 and an image sensor 14 disposed on the substrate 12 . In this embodiment, the image sensor 14 is a charge-coupled device (CCD). In other embodiments, the image sensor 14 can also be an image sensor 14 made by CMOS manufacturing technology. Not limited to.

The lens fixing module 20 includes a base 26 and a lens holder. The pedestal 26 has an open accommodating space 26a. When the pedestal 26 is coupled to the substrate 12, the image sensor 14 disposed on the substrate 12 is located in the accommodating space 26a.

The mirror mount has a hollow structure and has a tubular portion 22 and a base portion 24 that are integrally formed and communicate with each other. The tubular portion 22 has a cylindrical shape and the base portion 24 has a rectangular shape. The mirror holder has a first through hole 22a and a second through hole 22b at opposite ends. The first through hole 22a communicates with the cylindrical portion 22, and the first through hole 22a has a shape of a narrow outer width. The second through hole 22b communicates with the base portion 24. The predetermined optical axis Z1 passes through the center of the first through hole 22a and the second through hole 22b. The length of the largest diagonal of the second through hole 22b is greater than 0.6 times the distance of the maximum diagonal of the effective sensing area of the image sensor 14, preferably, the maximum diagonal of the second through hole 22b The distance greater than 0.8 times the maximum diagonal of the effective sensing area of the image sensor 14.

The lens 30 is disposed in the tubular portion 22 and is adjacent to the first through hole 22a of the image sensor 14 and is opposite to the image sensor 14. In this embodiment, the difference between the outer peripheral dimension of the lens 30 and the inner peripheral dimension of the tubular portion 22 is between -0.008 and 0.012 mm, and preferably, the outer peripheral dimension of the lens 30. Subtracting the inner circumference of the tubular portion 22 The difference obtained is between -0.004 and 0.008 g. Further, the lens 30 is defined to have a central axis Z2, and the central axis Z2 refers to the center of the through lens 30 and is parallel to the imaginary axis of the predetermined optical axis Z1. The offset of the central axis Z2 of the lens 30 from the center of the image sensor 14 is not zero and less than 0.5 mm. Preferably, the central axis Z2 of the lens 30 is opposite to the center of the image sensor 14. The offset is not zero and less than 0.25 mm, so that the image position of the image sensor 14 is relatively fixed, and a smaller image sensor 14 can be used for miniaturization.

In addition, an upper surface of the lens 30 is provided with an inter-mirror ring 60 for fixing the position and angle of the lens 30 in the tubular portion 22.

The aperture 40 is disposed between the lens 30 and the image sensor 14 to prevent light from entering the image sensor 14 to obtain better image quality. In other embodiments, the aperture 40 is located between the lens 30 and the first through hole 22a to reduce the amount of light entering. The position of the aperture 40 can be at different positions according to the designer's requirements, and is not limited thereto.

The bonding means 50 includes a first ring gear set 52 and a second ring gear set 54. The first ring gear set 52 has a plurality of convex teeth and a plurality of concave portions respectively located between each two adjacent convex teeth, and each concave portion has a bottom surface 52a and two side walls 52b perpendicular to the bottom surface 52a. The first ring set 52 is coupled to the base 24 and surrounds the second perforation 22b. In the present embodiment, the first ring set 52 and the base 24 are integrally formed components.

The second ring gear set 54 has a plurality of convex teeth and a plurality of concave portions respectively located between each two adjacent convex teeth, and each of the convex teeth has a top surface 54a and two perpendicular to the top surface 54a Upright wall 54b. The second ring set 54 is coupled to the base 26. In this embodiment, the second ring gear set 54 and the base 26 are integrally formed components. The first ring gear set 52 and the second ring gear set 54 are engaged with each other to fix the lens mount and the base 26 to each other. The first ring tooth When the group 52 is combined with the second ring gear set 54, the bottom surface 52a of the first ring gear set 52 gradually approaches the top surface 54a of the second ring gear set 54 until the focus of the lens 30 is at the image sensing. The first ring set 52 and the second set of teeth 54 are fixed to each other by means of dispensing.

As shown in FIG. 3, a gap 53a between the lens holder and the base 26 and parallel to the predetermined optical axis Z1 is the bottom surface 52a of the first ring gear group 52 and the second ring gear group 54. The gap 53a between the top faces 54a has a gap 53a between 0 and 0.5 mm, and the fit tolerance of the gap 53a is between 0.01 and 0.3 mm. Preferably, the fit tolerance of the gap 53a is Between 0.01 and 0.15 mm. In addition, in other embodiments, the gap between the lens holder and the base 26 in the direction perpendicular to the predetermined optical axis Z1 is 2.0 times the focal depth of the optical imaging system 100, preferably The gap between the lens holder and the base 26 in the direction perpendicular to the predetermined optical axis Z1 is 1.5 times the focal depth of the optical imaging system 100.

A gap 53b between the mirror base and the base 26 and perpendicular to the predetermined optical axis Z1 is a gap 53b between the adjacent side wall 52b and the upright wall 54b, and the distance of the gap 53b is between 0.002 and 1. Preferably, between the aliquots, the gap 53b between the adjacent side walls 52b and the upright walls 54b is between 0.005 and 0.5 mm. Further, the fitting tolerance of the gap 53b is between 0.005 and 0.5 mm. Further, in the present embodiment, the position of the dispensing is located on the outer side faces of the first ring gear group 52 and the second ring gear group 54, and is applied along the gaps 53a, 53b.

In addition, in order to ensure that the first ring gear set 52 and the outer side of the second ring gear set 54 are relatively flat, and when assembled, the first ring gear set 52 and the second ring gear set 54 can be observed. The flatness of the outer side surface is used to determine whether the central axis Z2 of the mirror plane is close to the preset optical axis Z1, so that the outer circumference of the first ring gear group 52 is designed to be subtracted from the outer circumference of the second ring gear set 54. The difference is between -0.4 and 0.4 mm. Preferably, the difference between the outer circumference of the first ring gear group 52 and the outer circumference of the second ring gear group 54 is between -0.2 and 0.2. Between the metrics.

In addition, the manner in which the first ring gear set 52 and the second ring gear set 54 are combined in the first embodiment is not limited to a lens used for a single lens, and may also be used for a lens of a plurality of lenses.

Referring to FIG. 4 to FIG. 6, the optical imaging system of the second embodiment of the present invention is shown.

The optical imaging system 200 of the second embodiment is similar to the optical imaging system 100 of the first embodiment, except that the number of lenses and the means of bonding are different. In the second embodiment, three lenses 32 are used, and the lenses 32 are disposed in the barrel 22 along a predetermined optical axis Z3, and a spacer ring 62 is disposed between the lenses to ensure each lens 32. The distance between them as well as the angle. In other embodiments, there are no spacer rings between the lenses, and the lenses abut each other for the purpose of miniaturization of the optical imaging system.

The bonding means 70 of the second embodiment includes a first sleeve 72 and a second sleeve 74. The first sleeve 72 is coupled to the base 84. The second sleeve 74 is coupled to the base 86 and sleeved on the first sleeve 72. In the present embodiment, the first sleeve 72 and the base 84 are integrally formed components, and the first sleeve 72 assumes a rectangular shape and can be seen as an extension of the base 84. The second sleeve 74 and the base 86 are integrally formed components, and the second sleeve 74 also presents a rectangular shape and can be seen as an extension of the base 86.

When the base portion 84 is gradually approaching the image sensing module 10, the first sleeve 72 is immersed in the second sleeve 74 until the focus of the lenses 32 is on the image sensor 14, and then A sleeve 72 and the second sleeve 74 are dispensed to secure the first sleeve 72 and the second sleeve 74 to each other.

If the design of the distance between the outer circumference of the first sleeve 72 and the inner circumference of the second sleeve 74 is too large, the center of the lens may be more likely to deviate from the predetermined optical axis Z3, resulting in the production of the optical imaging system. The quality of the first sleeve 72 is not stable, and if the distance is too small, the second sleeve 74 may not be sleeved or the glue may not be dispensed. Therefore, in the embodiment, the outer circumference of the first sleeve 72 is designed. The distance between the edge and the inner circumference of the second sleeve 74 is between 0.01 and 1 mm, or the inner circumference of the second sleeve 74 is designed to be smaller than the outer circumference of the first sleeve 72. The difference obtained is not zero and less than 0.4 mm. Preferably, the difference between the inner circumference of the second sleeve 74 and the outer circumference of the first sleeve 72 is not zero and less than 0.2 mm.

In addition, the manner in which the first sleeve and the second sleeve are combined in the second embodiment is not limited to a lens used for a plurality of lenses, and may also be used for a lens of a single lens.

Please refer to FIG. 7, which is an optical imaging system 300 of the third embodiment of the present invention. The optical imaging system 300 of the third embodiment is similar to the optical imaging system 200 of the second embodiment, except that the optical imaging system 300 of the third embodiment has no base and bonding means, but the base of the lens holder 90. 92 is directly connected to the substrate 12.

The base portion 92 has an open accommodating space 92a, and the lens holder 90 is disposed on the substrate 12 to position the image sensor 14 in the accommodating space 92a.

Three lenses are arranged side by side in the mirror base 90, and the axis passing through the center of the vertical lens is set as the predetermined optical axis Z4.

In order to ensure that the base portion 92 of the lens holder 90 is directly connected to the substrate 12, the imaging quality can be better. The eccentricity between the central axis Z5 of the lens 34 and the predetermined optical axis Z4 is not zero and less than 0.005. Preferably, the amount of eccentricity between the central axis Z5 of the lenses and the predetermined optical axis Z4 is not zero and less than 0.003 mm. The amount of skew between the optical axis Z6 of the lens 34 and the predetermined optical axis Z4 is not zero and less than 0.3 degrees. Preferably, the optical axis Z6 of the lens 34 The amount of skew with the predetermined optical axis Z4 is not zero and less than 0.23 degrees. Further, the central axis Z5 of the third embodiment refers to the average position of the centers of the lenses 34 and is parallel to the imaginary axis of the predetermined optical axis Z1. The optical axis Z6 refers to the actual optical axis when the lenses 34 are composed.

In summary, the optical imaging system of the present invention is designed to reduce the number of components by minimizing and slimming by the design of the tubular portion and the base which are integrally formed and connected to each other, and further, the tubular portion and the base portion are integrated. Made, so the entire structure is not easily deformed under temperature changes to maintain the imaging quality of the optical imaging system. In addition, in all of the above embodiments, the symmetrical lens and the cylindrical portion are exemplified, but in other embodiments, the asymmetric lens and the cylindrical portion can also be used.

The above description is only for the preferred embodiment of the present invention, and equivalent changes to the application of the present specification and the scope of the patent application are intended to be included in the scope of the present patent.

100‧‧‧Optical imaging system

10‧‧‧Image Sensing Module

12‧‧‧Substrate

14‧‧‧Image sensor

20‧‧‧Lens fixing module

22‧‧‧ Tube

22a‧‧‧First perforation

22b‧‧‧Second perforation

24‧‧‧ base

26‧‧‧Base

26a‧‧‧ accommodating space

30‧‧‧ lenses

40‧‧‧ aperture

50‧‧‧Combined means

52‧‧‧First ring tooth set

52a‧‧‧ bottom

52b‧‧‧ side wall

53a‧‧‧ gap

53b‧‧‧ gap

54‧‧‧second ring tooth set

54a‧‧‧ top

54b‧‧‧Upright wall

60‧‧‧ Inter-mirror ring

Z1‧‧‧Preset optical axis

Z2‧‧‧ central axis

Claims (25)

An optical imaging system includes: an image sensing module comprising a substrate and an image sensor disposed on the substrate; a lens fixing module comprising a base and a lens holder; the base having an open Having a space for being disposed on the substrate such that the image sensor is located in the accommodating space; the lens holder is hollow, and has one tube portion and a base portion which are integrally formed and communicate with each other, and the lens holder Having a first through hole and a second through hole at opposite ends, the first through hole communicates with the cylindrical portion and the second through hole communicates with the base portion, and a length of a maximum diagonal line of the second through hole is greater than 0.6 times The maximum diagonal of the effective sensing area of the image sensor; in addition, the lens holder is disposed on the base to shield the receiving space from contacting the substrate, and the base is connected to the base. In addition, the gap between the lens holder and the base in the direction perpendicular to the predetermined optical axis is 2.0 times the focal depth of the optical imaging system; at least one lens is disposed in the tube and is compared The shadow A first sensor proximate the perforations, and the positive image sensor; and an aperture stop disposed in the cylindrical portion. The optical imaging system of claim 1, wherein the central axis of the lens or the lenses is offset from the center of the image sensor by no less than 0.5 mm. The optical imaging system of claim 1, wherein a difference in outer peripheral size of the lens or the outer diameter of the outer diameter of the cylindrical portion is between -0.008 and 0.012 mm. The optical imaging system of claim 1, having a predetermined optical axis that passes through the second through hole vertically, wherein a tolerance of a gap between the lens holder and the base in a direction parallel to the predetermined optical axis is 0.01 ~0.30 mm. The optical imaging system of claim 1, wherein the plurality of lenses are disposed in the cylindrical portion along a predetermined optical axis, and a spacer ring is disposed between the lenses. The optical imaging system of claim 1, wherein the plurality of lenses are disposed in the tube along a predetermined optical axis, and the lenses abut each other. The optical imaging system of claim 1, having a predetermined optical axis passing through a center of the second through hole, wherein the lens fixing module further comprises a bonding means disposed between the base and the lens holder to The base is coupled to the mirror mount such that the predetermined optical axis is near the center of the effective sensing area of the image sensor. The optical imaging system of claim 7, wherein the bonding means comprises: a first ring gear set having a plurality of convex teeth and a plurality of recesses, the recesses being respectively located between each two adjacent convex teeth, a first ring gear set connected to the base and surrounding the second through hole; and a second ring gear set having a plurality of convex teeth and a plurality of recesses respectively located between each two adjacent convex teeth The second ring gear set is coupled to the base and engages the first ring gear set. The optical imaging system of claim 8, wherein one of the recesses of the first ring set has a bottom surface, and one of the second set of teeth has a top surface adjacent to the top a surface, and the distance between the bottom surface and the top surface is between 0 and 0.5 mm. The optical imaging system of claim 8, wherein a sidewall of one of the recesses of the first ring set is adjacent to an upstanding wall of one of the teeth of the second set of teeth, and the sidewall and the upright wall The distance between 0.002~1 mm. The optical imaging system of claim 7, wherein the bonding means comprises: a first sleeve coupled to the base; and a second sleeve coupled to the base and sleeved to the first sleeve. The optical imaging system of claim 11, wherein a distance between an outer circumference of the first sleeve and an inner circumference of the second sleeve is between 0.01 and 1 mm. The optical imaging system of claim 11, wherein the difference in outer peripheral dimension of the second sleeve minus the outer peripheral dimension of the first sleeve is not zero and less than 0.4 mm. A lens fixing module comprises: a base having an open receiving space; and a mirror base which is hollow and has a tubular portion and a base which are integrally formed and communicate with each other, and the mirror base is opposite Each of the two ends has a first through hole and a second through hole. The first through hole communicates with the cylindrical portion and the second through hole communicates with the base portion. In addition, the lens holder is disposed on the base to shield the receiving space. The base is connected to the base, and the first through hole and the second through hole communicate with the accommodating space, and the second through hole is closer to the accommodating space than the first through hole; wherein the lens fixing module has a vertical through a predetermined optical axis of the second through hole, and a matching tolerance between the lens holder and the base in a direction parallel to the predetermined optical axis Between 0.01 and 0.3 mm, in addition, the gap between the lens holder and the base in the direction perpendicular to the predetermined optical axis is 2.0 times the focal depth of the optical imaging system. The lens fixing module of claim 14, wherein the lens fixing module further comprises a bonding means disposed between the base and the lens holder to couple the base to the lens holder and to make the preset The optical axis is near the center of the effective sensing area of the image sensor. The lens fixing module of claim 15, wherein the bonding means comprises: a first ring gear set having a plurality of convex teeth and a plurality of concave portions respectively located between each two adjacent convex teeth, The first ring gear set is coupled to the base portion and surrounds the second through hole; a second ring gear set has a plurality of convex teeth and a plurality of concave portions respectively located between each two adjacent convex teeth The second ring gear set is coupled to the base and engages the first ring gear set. The lens fixing module of claim 16, wherein one of the recesses of the first ring gear set has a bottom surface, and one of the convex teeth of the second ring gear set has a top surface adjacent to the bottom surface The top surface, and the distance between the bottom surface and the top surface is between 0 and 0.5 mm. The lens fixing module of claim 16, wherein one of the first ring gear sets has a first side wall, and one of the second ring tooth sets has a second side wall, the first side A sidewall is adjacent to the second sidewall, and a distance between the first sidewall and the second sidewall is between 0.002 and 1 mm. The lens fixing module of claim 18, wherein a distance between the first side wall and the second side wall is between 0.005 and 0.5 mm. The lens fixing module of claim 19, wherein a difference between the outer circumference of the first ring tooth group and the outer circumference of the second ring tooth group is between -0.4 and 0.4 mm. The lens fixing module of claim 16, wherein the outer circumference of the first ring tooth group minus the outer circumference of the second ring tooth group is between -0.2 and 0.2 mm. The lens fixing module of claim 16, wherein the bonding means comprises: a first sleeve connected to the base; and a second sleeve connected to the base and sleeved on the first sleeve . The lens fixing module of claim 22, wherein a distance between an outer circumference of the first sleeve and an inner circumference of the second sleeve is between 0.01 and 1 mm. The lens fixing module of claim 22, wherein the difference between the outer circumference dimension of the second sleeve and the outer circumference dimension of the first sleeve is not zero and less than 0.4 mm. The lens fixing module of claim 24, wherein the difference between the inner circumference of the second sleeve and the outer circumference of the first sleeve is not zero and less than 0.2 mm.