TWI556646B - Image sensor module and method for adjusting focus of image sensor module - Google Patents

Description

Image sensing module and method for adjusting focal length of image sensing module

The invention relates to an image sensing module, in particular to an image sensing module and a method for adjusting the focal length of the image sensing module.

Please refer to FIG. 1 , which illustrates a conventional image sensing module 100. As shown in FIG. 1 , the image sensing module 100 includes a substrate 110 , an image sensor 120 , and a fixing base ( A holder 130, a lens module 140, and a lens barrel 150. When the image sensing module 100 needs to adjust the focal length, the user can rotate the lens barrel 150 to move the lens barrel 150 relative to the fixed seat 130 to increase or decrease the distance between the image sensor 120 and the lens module 140. The focal length of the image sensing module 100 is adjusted.

However, when the lens module 140 has more than one lens, such as the four lenses shown in FIG. 2, the image sensing module 100 may encounter some problems when adjusting the focal length. As shown in FIG. 2, when the lens barrel is rotated (that is, the lens module 240 is rotated), some of the lenses in the lens module 240 may exceed the sensing area 222 of the image sensor 220, causing the image sensor 220. All of the light that is transmitted from the lens of the lens module 240 cannot be sensed.

In addition, after the image sensing module 100 is assembled, the lens barrel 150 may have a tilt problem, thereby causing the image sensed by the image sensor 120 to be blurred, but the image shown in FIG. 1 is The image sensing module 100 cannot easily solve this problem.

Therefore, one of the objects of the present invention is to provide an image sensing module and a method for adjusting the focal length of the image sensing module to solve the above problems.

According to an embodiment of the invention, an image sensing module includes a substrate, an image sensor mounted on the substrate, a fixing base disposed on the substrate, and a lens barrel for fixing a lens module. And at least one spring, wherein the spring is disposed between the fixing seat and the lens barrel, and the spring applies a force to the fixing base and the lens barrel; and the lens barrel has at least one perforation and a bolt penetration The perforation is screwed into a bolt hole in the fixing seat.

According to an embodiment of the invention, a method for adjusting a focal length of an image sensing module is disclosed. The image sensing module includes a substrate, an image sensor mounted on the substrate, and a substrate disposed on the substrate. a fixing base, a lens barrel for fixing a lens module, and at least one spring, wherein the spring is disposed between the fixing seat and the lens barrel, and the spring applies a force to the fixing seat and the mirror a barrel; and the barrel has at least one perforation, and a bolt penetrates the perforation and is screwed into a bolt hole in the holder; and the method includes: tightening the bolt or loosening the bolt to adjust the The distance between the fixing seat and the lens barrel to adjust the focal length of the image sensing module.

100, 300‧‧‧ image sensing module

110, 310‧‧‧ substrate

120, 220, 320‧‧‧ image sensor

130, 330‧‧‧ fixed seat

140, 240, 340‧‧‧ lens modules

150, 360‧‧‧ lens barrel

222‧‧‧Sensing area

322, 324‧‧ ‧ positioning bolt

332_1, 332_2, 332_3, 332_4‧‧‧ bolt holes

334, 364‧‧‧ openings

350_1, 350_2, 350_3, 350_4, 650‧‧‧ Pressure coil springs

362_1, 362_2, 362_3, 362_4‧‧‧ perforation

370_1, 370_2, 370_3, 370_4‧‧‧ bolts

510‧‧‧Wrench

Figure 1 is a schematic diagram of a conventional image sensing module.

FIG. 2 is a schematic diagram showing a portion of the lens in the lens module not in the sensing area of the image sensor when a lens barrel is rotated.

FIG. 3 is a schematic diagram of components of the image sensing module before being assembled according to an embodiment of the invention.

Figure 4 is a cross-sectional view of the image sensing module after assembly.

Figure 5 is a schematic diagram showing the adjustment of the focal length of the image sensing module by tightening or loosening the bolts.

FIG. 6 is a schematic diagram of an image sensing module according to another embodiment of the present invention.

Please refer to FIG. 3 and FIG. 4 simultaneously. FIG. 3 is a schematic diagram of components of the image sensing module 300 before being assembled according to an embodiment of the present invention, and FIG. 4 is the image sensing module 300. Sectional view after assembly. As shown in FIG. 3, the image sensing module 300 includes a substrate 310, an image sensor 320, two positioning pins 322, 324, a fixing base 330, a lens module 340, and four springs. In the embodiment, there are four pressure coil springs 350_1, 350_2, 350_3, 350_4), a lens barrel 360, and four bolts 370_1, 370_2, 370_3, 370_4. The image sensor 320 is mounted on the substrate 310. The fixing base 330 has an opening 334 and four bolt holes 332_1, 332_2, 332_3, and 332_4. The lens barrel 360 fixes the lens module 340 through an adhesive, and the mirror is fixed. The barrel 360 includes four perforations 362_1, 362_2, 362_3, 362_4 and an opening 364.

In this embodiment, the lens module 340 includes an array of lenses, and the lens module 340 includes four lenses. However, the number of lenses in the lens module 340 is not a limitation of the present invention. In other embodiments, the lens mode The number of lenses in group 340 can vary from designer considerations.

As shown in FIG. 3, the pressure coil springs 350_1, 350_2, 350_3, 350_4 are disposed between the fixing base 330 and the lens barrel 360, and each of the bolts 370_1, 370_2, 370_3, 370_4 passes through the perforation on the lens barrel 360, respectively. 362_1, 362_2, 362_3, 362_4 and pressure coil springs 350_1, 350_2, 350_3, 350_4 to relatively fix the lens barrel 360 to the fixed seat 330, wherein each bolt is located within the corresponding pressure coil spring. In detail, the bolt 370_1 penetrates the center of the through hole 362_1 and the pressure coil spring 350_1 to be connected to the bolt hole 332_1, and the bolt 370_2 penetrates through the center of the through hole 362_2 and the pressure coil spring 350_2 to be connected to the bolt hole 332_2, and the bolt 370_3 penetrates the through hole 362_3 Connect to the center of the pressure coil spring 350_3 to connect to the bolt hole 332_3, and the bolt 370_4 penetrates through the center of the through hole 362_4 and the pressure coil spring 350_4 to be connected to the bolt hole 332_4.

Referring to FIG. 4, after the image sensing module 300 is assembled, the pressure coil springs 350_1, 350_2, 350_3, 350_4 exert an elastic force on the lens barrel 360 and the fixing base 330, and since the lens barrel 360 simultaneously receives the bolt 370_1 The pressure applied by the bolt heads of 370_2, 370_3, 370_4 and the elastic tension applied by the pressure coil springs 350_1, 350_2, 350_3, 350_4, so that the lens barrel 360 can be fixed on the fixing base 330. Then, the image sensor 320 can sense the light that is transmitted from the outside through the opening 364 of the lens barrel 360, the lens module 360, and the opening 334 of the fixing base 330.

When the focal length of the lens module 340 does not fall accurately on the image sensor 320, the image sensing module 300 needs to adjust the focal length to enable the image sensor 320 to generate a clear image. At this time, please refer to FIG. 5, the engineer can use a wrench 510 or a screwdriver to reduce or increase the between the lens barrel 360 and the fixing seat 330 by tightening or loosening the bolts 370_1, 370_2, 370_3, 370_4. The distance (ie, the distance between the lens module 340 and the image sensor 320 is reduced or increased) to adjust the focal length of the image sensing module 300. In an embodiment, the engineer can use a wrench 510 or a screwdriver to tighten the bolt to reduce the distance between the lens barrel 360 and the holder 330, and use a wrench 510 or a screwdriver to loosen the bolt to increase the barrel 360. The distance from the mount 330.

As described above, when the focal length of the image sensing module 300 is adjusted, the lens module 340 does not need to be rotated. Therefore, the lens in the lens module 340 will always be in the sensing area of the image sensor 320.

In addition, when the image sensing module 300 is assembled, the lens barrel 360 is tilted. Engineers can simply use a wrench or screwdriver to tighten or loosen one or two bolts to resolve the tilt problem.

Further, in the embodiments shown in Figs. 3 and 4, four bolts and four springs are included, however, this is not a limitation of the present invention. In other embodiments, the number of bolts, springs, and bolt holes may vary depending on the designer's consideration. For example, the image sensing module 300 shown in FIG. 3 may be modified to include only two Bolts (eg 370_1 and 370_4), and two pressure coil springs (eg 350_1, 350_4). In another embodiment, the image sensing module 300 shown in FIG. 3 can be modified to include only one bolt and one pressure coil spring disposed at a position close to the center of the image sensing module 300. All of the above design changes are subject to the scope of the present invention.

In the image sensing module 300 shown in FIG. 3, four pressure coil springs 350_1, 350_2, 350_3, and 350_4 are included, and four bolts 370_1, 370_2, 370_3, and 370_4 are respectively located at the pressure coil springs 350_1 and 350_2. The center of 350_3, 350_4, however, in other embodiments, the pressure coil spring may be disposed at other locations to apply an elastic force over the barrel 360 and the mount 330. Please refer to FIG. 6. FIG. 6 is a schematic diagram of an image sensing module 600 according to another embodiment of the present invention. The image sensing module 600 is similar to the image sensing module 300 shown in FIG. The difference is in the design of the spring. In the image sensing module 600, a pressure coil spring 650 is disposed at the center of the lens barrel 360 and the fixing base 330, and the pressure coil spring 650 applies an elastic force on the surrounding area of the lens module 340.

Briefly summarized in the present invention, in the image sensing module of the present invention and the method for adjusting the focal length of the image sensing module, when the focal length of the image sensing module is adjusted, the lens module itself does not need to be rotated, and therefore, the lens The lens in the module will always be within the sensing area of the image sensor.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

300‧‧‧Image Sensing Module

310‧‧‧Substrate

320‧‧‧Image sensor

322, 324‧‧ ‧ positioning bolt

330‧‧‧ Fixed seat

332_1, 332_2, 332_3, 332_4‧‧‧ bolt holes

334, 364‧‧‧ openings

340‧‧‧ lens module

350_1, 350_2, 350_3, 350_4‧‧‧ Pressure coil springs

360‧‧‧Mirror tube

362_1, 362_2, 362_3, 362_4‧‧‧ perforation

370_1, 370_2, 370_3, 370_4‧‧‧ bolts

Claims (10)

An image sensing module includes: a substrate; an image sensor mounted on the substrate; a fixing base disposed on the substrate; a lens barrel for fixing a lens module; and at least one a spring disposed between the fixing base and the lens barrel for applying an elastic force on the fixing base and the lens barrel; wherein the lens barrel includes at least one perforation, and a bolt passes through the perforation and is screwed into the fixing In the seat. The image sensing module of claim 1, wherein the spring is a pressure coil spring, and the bolt is located in the pressure coil spring. The image sensing module of claim 1, wherein the image sensing module comprises four pressure coil springs disposed between the fixing base and the lens barrel, the lens barrel having four perforations. Four bolts respectively pass through the four perforations to relatively fix the lens barrel to the fixing base, and each bolt is located in a corresponding pressure coil spring. The image sensing module of claim 3, wherein the four perforations are respectively disposed at four corners of the lens barrel. The image sensing module of claim 1, wherein the lens module is disposed at a center of the lens barrel, the spring is disposed at a center of the lens barrel and the fixing seat, and the spring applies an elastic force On the surrounding area of the lens module. The image sensing module of claim 1, wherein the lens module comprises a transparent lens A mirror array, and the lens array includes a plurality of lenses, and the plurality of lenses correspond to different regions on the image sensor. The image sensing module of claim 1, wherein the fixing base comprises at least one bolt hole for connecting the bolt, and the distance between the fixing seat and the lens barrel is tightened or loosened. The bolt is adjusted. The image sensing module of claim 7, wherein the distance between the fixing seat and the lens barrel is reduced by tightening the bolt, and the distance between the fixing seat and the lens barrel is Increase by loosening the bolt. A method for adjusting a focal length of an image sensing module, wherein the image sensing module comprises: a substrate; an image sensor mounted on the substrate; a fixing base disposed on the substrate; a lens barrel for fixing a lens module; at least one spring disposed between the fixing seat and the lens barrel for applying an elastic force on the fixing base and the lens barrel; wherein the lens barrel includes at least one Perforating, and a bolt penetrates the perforation and screwed into the mount; and the method includes: tightening the bolt or loosening the bolt to adjust a distance between the mount and the barrel to adjust the The focal length of the image sensing module. The image sensing module of claim 9, wherein the bolt is tightened or loosened The step of adjusting the distance between the fixing seat and the lens barrel to adjust the focal length of the image sensing module comprises: tightening the bolt to reduce the distance between the fixing seat and the lens barrel; Loosen the bolt to increase the distance between the mount and the barrel.