TWI487996B - Image capturing module and method of aligning and assembling the same - Google Patents

Description

Image capturing module and alignment assembly method thereof

The present invention relates to an image capturing module and an alignment assembly method thereof, and more particularly to an image capturing module that can accurately position a center position of a movable lens assembly to a center position of an image sensing chip when actually actuated. And its alignment method.

In recent years, the trend of handheld devices such as mobile phones and PDAs has become increasingly popular, and with the market demand for better handheld devices and smaller size, The group has faced the dual requirements of higher image quality and miniaturization. In view of the improvement of the image quality of the image capture module, on the one hand, the pixel is improved. The market trend is from the original VGA level of 30 pixels, which has progressed to the current two million pixels and three million pixels commonly used in the market. Even worse, it has introduced a higher level of more than eight million pixels. In addition to the improvement of pixels, on the other hand, the resolution of the image is taken care of. Therefore, the image capturing module of the handheld device is also developed by the fixed focus image capturing function toward the camera-like optical autofocus function or even the optical zoom function.

The principle of the optical autofocus function is to move the lens in the image capturing module appropriately in the Z direction according to different distances and close distances of the target object, so that the optical image of the image capturing object can be accurately focused on the image sensing. On the device to produce a clear image. At present, it is common to activate the lens movement in the image capturing module, which includes stepping motor actuation, piezoelectric actuation, and voice coil motor (VCM) actuation. However, in actual operation, if the actuator can move the lens together in the X direction and the Y direction, the mirror in the conventional image capturing module The center position of the head will not be able to effectively and accurately locate the center of the image sensor.

An embodiment of the present invention provides an image capturing module and a method for assembling the same, which can be used to solve the conventional image capturing module when the actuator can move the lens in the X direction and the Y direction together. The center position of the lens will not be able to effectively and accurately locate the center of the image sensor.

An aligning method for assembling an image capturing module according to an embodiment of the present invention includes the following steps: providing an image sensing unit and an actuator unit, wherein the image sensing unit includes an image sensing a wafer, and the actuator unit includes a frame housing having a predetermined positioning point or a predetermined positioning line and a movable lens assembly movably disposed in the frame housing; applying a predetermined energy to drive the Actuating the actuator unit such that the central position of the movable lens assembly is offset relative to the predetermined positioning point or the predetermined positioning line of the frame housing to a fixed offset position to obtain a predetermined positioning point of the frame housing or a predetermined horizontal direction of the predetermined positioning line to the center position of the movable lens assembly and a predetermined horizontal distance; removing the predetermined energy; relative to the image Sensing a center position of the wafer, and the predetermined positioning point or the predetermined positioning line of the frame housing is subjected to a predetermined horizontal offset distance along a predetermined horizontal offset direction a flat offset, wherein the predetermined horizontal direction and the predetermined horizontal offset direction are two opposite directions, and the predetermined horizontal distance and the predetermined horizontal offset distance are two identical distances; and, in the frame housing In the case where the predetermined positioning point or the predetermined positioning line has been horizontally offset from the central position of the image sensing wafer by the predetermined horizontal offset direction and the predetermined horizontal offset distance, The actuator unit is fixed to the image sensing unit.

An image capturing module according to another embodiment of the present invention includes: an image sensing unit and an actuator unit. The image sensing unit includes a circuit substrate and an image sensing chip disposed on the circuit substrate and electrically connected to the circuit substrate, wherein an image sensing region is disposed at a top end of the image sensing chip area. The actuator unit includes a frame housing disposed on the image sensing unit and a movable lens assembly movably disposed within the frame housing. Wherein the image sensing area has a first geometric center line, the movable lens assembly has a second geometric center line, and the movable lens is applied after the actuator unit is applied with a predetermined energy The second geometric centerline of the assembly will be exactly opposite the first geometric centerline of the image sensing region.

According to still another embodiment of the present invention, an image capturing module includes: an image sensing unit and an actuator unit. The image sensing unit includes a circuit substrate and an image sensing chip disposed on the circuit substrate and electrically connected to the circuit substrate, wherein a top end of the image sensing chip has an image sensing area. The actuator unit includes a frame housing disposed on the image sensing unit and a movable lens assembly movably disposed within the frame housing. Wherein the image sensing area has a first geometric center point, the movable lens assembly has a second geometric center point, and the movable lens is applied after the actuator unit is applied with a predetermined energy The second geometric center point of the component will be exactly opposite the first geometric center point of the image sensing area.

The beneficial effects of the present invention may be that when a predetermined energy is applied to drive the actuator unit, the center position of the movable lens assembly may be offset to a fixed offset with respect to a predetermined positioning point or a predetermined positioning line of the frame housing. Positioning, whereby the second geometric centerline (or second geometric center point) of the movable lens assembly is accurately aligned with the first geometric centerline (or first geometric center) of the image sensing region of the image sensing wafer point).

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

M‧‧‧Image Capture Module

1‧‧‧Image sensing unit

10‧‧‧Image sensing chip

100‧‧‧Image sensing area

L1‧‧‧First geometric centerline

P1‧‧‧First geometric center point

11‧‧‧ circuit board

2‧‧‧Actuator unit

20‧‧‧Frame housing

20‧‧‧Frame housing

201‧‧‧ first frame

202‧‧‧ second framework

L3‧‧‧ Third geometric centerline

P3‧‧‧ Third geometric center point

21‧‧‧Removable lens assembly

L2‧‧‧Second geometric centerline

P2‧‧‧Second geometric center point

3‧‧‧ sensor switch

D1‧‧‧predetermined horizontal distance

D2‧‧‧predetermined horizontal offset distance

1 is a flow chart of a method for assembling an image capturing module of the present invention.

2A is a side view of the image sensing unit of the image capturing module of the present invention.

2B is a top view of the image sensing unit of the image capturing module of the present invention.

3A is a side elevational view of the actuator unit of the image capture module of the present invention.

FIG. 3B is a top view of the actuator unit of the image capturing module of the present invention.

4A is a side view showing a step S102 of the alignment assembling method of the image capturing module of the present invention.

4B is a top plan view of step S102 of the method for assembling the image capturing module of the present invention.

FIG. 5A is a side view of the step S106 of the method for assembling the image capturing module of the present invention.

FIG. 5B is a top view of step S106 of the method for assembling the image capturing module of the present invention.

FIG. 6A is a side view of the step S108 of the method for assembling the image capturing module of the present invention.

FIG. 6B is a top view of the step S108 of the method for assembling the image capturing module of the present invention.

FIG. 7A is a side view of the step S110 of the method for assembling the image capturing module of the present invention.

FIG. 7B is a top view of the step S110 of the method for assembling the image capturing module of the present invention.

FIG. 8 is a side view of the image capturing module of the present invention using a voice coil actuator.

Referring to FIG. 1 to FIG. 7B, the present invention provides an alignment assembly method of an image capturing module M, which includes the following steps:

First, step S100: together with FIG. 1 and FIG. 2A to FIG. 3B, an image sensing unit 1 and an actuator unit 2 are provided. The image sensing unit 1 includes an image sensing wafer 10 and an actuator. The unit 2 includes a frame housing 20 having a predetermined positioning point or a predetermined positioning line and a movable lens assembly 21 movably disposed within the frame housing 20. Further, the image sensing unit 1 includes a The image sensing substrate 10 has an image sensing area 100, wherein the image sensing area 100 has a first geometric center line L1 and a first geometric center point P1 (eg, 2A), and the movable lens assembly 21 has a second geometric center line L2 and a second geometric center point P2 (as shown in FIG. 3A). For example, the top end of the frame housing 20 has an opening, the predetermined positioning line of the opening of the frame housing 20 is a third geometric center line L3, and the predetermined positioning point of the opening of the frame housing 20 is a third geometric center. Point P3. However, the invention is not limited thereto.

Next, in step S102, as shown in FIG. 1 , FIG. 3A to FIG. 4B , a predetermined energy is applied to drive the actuator unit 2 such that the central position of the movable lens assembly 21 is relative to the predetermined positioning point or predetermined of the frame housing 20 . The positioning line is offset to a fixed offset position (ie, the moving lens assembly 21 is offset to a fixed offset position in accordance with the direction indicated by the solid arrow of FIG. 4B) to obtain a predetermined positioning from the frame housing 20. The point or predetermined positioning line is to a predetermined horizontal direction of the center position of the movable lens assembly 21 and a predetermined horizontal distance D1 (as shown in FIGS. 4A and 4B). Further, the predetermined horizontal distance D1 is the distance formed between the second geometric center line L2 of the movable lens assembly 21 and the third geometric center line L3 of the frame housing 20 (as shown in FIG. 4A). In other words, the predetermined horizontal distance D1 is the distance formed between the second geometric center point P2 of the movable lens assembly 21 and the third geometric center point P3 of the frame housing 20 (as shown in FIG. 4B). For example, when the actuator unit 2 has not been driven by a sensor switch 3 (for example, a Hall Effect Sensor Switch) to provide a predetermined initial power, as shown in FIG. 3A. The second geometric centerline L2 of the movable lens assembly 21 originally overlaps the third geometric centerline L3 of the frame housing 20. When the actuator unit 2 is driven by the opening of the sensor switch 3 to provide a predetermined initial electrical energy, as shown in FIG. 4A, the second geometric centerline L2 of the movable lens assembly 21 may be relative to the frame housing 20 The three geometric center lines L3 are offset in parallel by a predetermined horizontal distance D1 (as shown in Fig. 4B).

Then, step S104: in conjunction with FIG. 1, FIG. 3A to FIG. 4B, the reservation is removed. The energy (i.e., the predetermined initial electrical energy provided by the sensor switch 3 is removed) causes the movable lens assembly 21 to return to the vicinity of the initial position. Therefore, the present invention can obtain the second geometric center line L2 of the movable lens assembly 21 relative to the frame housing 20 when the driving actuator unit 2 is driven by a predetermined energy by the execution of steps S102 and S104. The offset direction of the third geometric center line L3 (i.e., the predetermined horizontal direction indicated by the solid arrow in Fig. 4B) and the offset distance (i.e., the predetermined horizontal distance D1 as shown in Fig. 4B).

Next, in step S106, as shown in FIG. 1, FIG. 5A and FIG. 5B, the frame is sensed relative to the center of the image sensing wafer 10 (the position of the image sensing wafer 10 as shown in FIGS. 5A and 5B). The predetermined positioning point or predetermined positioning line of the housing 20 is subjected to a predetermined horizontal offset distance D2 along a predetermined horizontal offset direction (as indicated by the solid arrow in FIG. 5B) (as shown in FIGS. 5A and 5B). Horizontal offset, wherein the "predetermined horizontal direction" indicated by the solid arrow of FIG. 4B and the "predetermined horizontal offset direction" indicated by the solid arrow of FIG. 5B are opposite directions, and as shown in FIG. 4B The "predetermined horizontal distance D1" and the "predetermined horizontal offset distance D2" as shown in FIG. 5B are two identical distances. Further, the predetermined horizontal offset distance D2 is a distance formed between the third geometric center line L3 of the frame housing 20 and the first geometric center line L1 of the image sensing area 100 (as shown in FIG. 5A). ). In other words, the predetermined horizontal offset distance D2 is the distance formed between the third geometric center point P3 of the frame housing 20 and the first geometric center point P1 of the image sensing area 100.

Next, in step S108, as shown in FIG. 1, FIG. 6A and FIG. 6B, the predetermined positioning point or the predetermined positioning line of the frame housing 20 has been subjected to a predetermined horizontal offset direction and a predetermined position with respect to the center position of the image sensing wafer 10. In the case where the horizontal offset is horizontally shifted by the distance D2, the actuator unit 2 is fixed to the image sensing unit 1. Furthermore, after the actuator unit 2 is fixed on the image sensing unit 1 (as shown in FIG. 6A), the third geometric center line L3 of the frame housing 20 senses the image relative to the image sensing wafer 10. The first geometric centerline L1 of the measurement region 100 will exhibit a special offset assembly design that is horizontally offset by a predetermined horizontal offset distance D2 (as shown in Figure 6B).

Then, in step S110, as shown in FIG. 1 and FIG. 7A to FIG. 7B, the predetermined energy (that is, the predetermined initial electric energy provided by the opening of the sensor switch 3) is applied again to drive the actuator unit 2 so as to be movable. The center position of the lens assembly 21 is again offset to a fixed offset position with respect to a predetermined positioning point or predetermined positioning line of the frame housing 20 (ie, the moving lens assembly 21 may be in a predetermined horizontal direction indicated by the solid arrow of FIG. 7B). And a predetermined horizontal distance D1 to offset to a fixed offset position) whereby the center position of the movable lens assembly 21 will be accurately positioned at the center of the image sensing wafer 10.

Still further, after step S108, the present invention may further include: applying a predetermined energy again to drive the actuator unit 2 such that the second geometric centerline L2 of the movable lens assembly 21 is opposite to the third of the frame housing 20 The geometric centerline L3 is again offset to a fixed offset position whereby the second geometric centerline L2 of the movable lens assembly 21 will be accurately aligned with the first geometric centerline L1 of the image sensing region 100. In other words, when the actuator unit 2 is again driven by the applied predetermined energy, the second geometric centerline L2 of the movable lens assembly 21 will again follow the predetermined geometric centerline L3 of the frame housing 20 along the predetermined The horizontal direction is horizontally offset by a predetermined horizontal distance D1, whereby the second geometric centerline L2 of the movable lens assembly 21 will be accurately aligned with the first geometric centerline L1 of the image sensing region 100.

Still further, after step S108, the present invention may further include: applying predetermined energy again to drive the actuator unit 2 such that the second geometric center point P2 of the movable lens assembly 21 is relative to the third of the frame housing 20. The geometric center point P3 is again offset to a fixed offset position whereby the second geometric center point P2 of the movable lens assembly 21 will be accurately aligned with the first geometric center point P1 of the image sensing area 100. In other words, when the actuator unit 2 is again driven by the applied predetermined energy, the second geometric center point P2 of the movable lens assembly 21 will again follow the predetermined third geometric center point P3 of the frame housing 20 along the predetermined The horizontal direction is horizontally shifted by a predetermined horizontal distance D1, whereby the second geometric center point P2 of the movable lens assembly 21 will be accurately positioned at the first geometric center point P1 of the image sensing area 100.

Of course, the image sensing unit 1 and the actuator unit 2 of the present invention are not limited to use only the first geometric center line L1 (or the first geometric center point P1) of the image sensing area 100, and the second of the movable lens assembly 21 The alignment correction is performed by the relative relationship between the geometric center line L2 (or the second geometric center point P2) and the third geometric center line L3 (or the third geometric center point P3) of the frame housing 20. For example, a predetermined positioning point or predetermined positioning line of the frame housing 20 may also be provided at the edge of the frame housing 20, such as at the inner edge of the opening of the frame housing 20 or at the outer edge of the frame housing 20.

Therefore, with reference to FIG. 8 , the present invention can provide an image capturing module M including an image sensing unit 1 and an actuator unit 2 (for example, by the method of assembling the steps S100 to S110). Voice coil actuator, but the invention is not limited thereto. The image sensing unit 1 includes an image sensing chip 10 and a circuit substrate 11 for carrying the image sensing wafer 10 , and the top end of the image sensing wafer 10 has an image sensing area 100 . The actuator unit 2 includes a frame housing 20 disposed on the image sensing unit 1 and a movable lens assembly 21 movably disposed in the frame housing 20, wherein the movable lens assembly 21 can be composed of a plurality of optical lenses (not shown), and the frame housing 20 further includes a first frame 201 disposed on the image sensing unit 1 and a second frame 202 disposed on the first frame 201 to enable the movable lens assembly The XYZ triaxial movement can be performed within the second frame 202.

For one example, the image sensing region 100 has a first geometric centerline L1 and the movable lens assembly 21 has a second geometric centerline L2. As shown in FIG. 7A, after the actuator unit 2 is applied with a predetermined energy, the movable lens assembly 21 is deflected so that the second geometric center line L2 of the movable lens assembly 21 will accurately lie in the image sense. The first geometric centerline L1 of the region 100 is measured.

As another example, the top end of the image sensing area 100 has a first geometric center point P1, and the top end of the movable lens assembly 21 has a second geometric center point P2. As shown in FIG. 7A, after the actuator unit 2 is applied with a predetermined energy, the movable lens assembly 21 is deflected so that the second geometry of the movable lens assembly 21 is The heart point P2 will be exactly at the first geometric center point P1 of the image sensing area 100.

[Possible effects of the examples]

In summary, the image capturing module M and the alignment assembling method thereof can be provided by applying a predetermined energy to drive the actuator unit 2, so that the image capturing module M can be driven by the embodiment of the present invention. The central position of the movable lens assembly 21 is offset relative to a predetermined positioning point or predetermined positioning line of the frame housing 20 to a fixed offset position to obtain a predetermined positioning point or predetermined positioning line from the frame housing 20 to be movable. a predetermined horizontal direction and a predetermined horizontal distance D1" of the center position of the lens assembly 21 and "a predetermined horizontal offset direction with respect to the center position of the image sensing wafer 10 at a predetermined positioning point or predetermined positioning line of the frame housing 20" And in the case of a horizontal offset of the predetermined horizontal offset distance D2, the actuator unit 2 is fixed on the image sensing unit 1" so that when a predetermined energy is applied to drive the actuator unit 2, The center position of the moving lens assembly 21 may be offset to a fixed offset position relative to a predetermined positioning point or predetermined positioning line of the frame housing 20, whereby the second geometry of the movable lens assembly 21 is movable Line L2 (or the second geometric center point P2) of a first geometric centerline accurate image sensor chip sensing region of the image sensor 10 is positioned 100 L1 (or a first geometric center P1).

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, equivalent technical changes made by the present invention and the contents of the drawings are included in the scope of the present invention.

M‧‧‧Image Capture Module

1‧‧‧Image sensing unit

10‧‧‧Image sensing chip

100‧‧‧Image sensing area

L1‧‧‧First geometric centerline

P1‧‧‧First geometric center point

11‧‧‧ circuit board

2‧‧‧Actuator unit

20‧‧‧Frame housing

201‧‧‧ first frame

202‧‧‧ second framework

21‧‧‧Removable lens assembly

L2‧‧‧Second geometric centerline

P2‧‧‧Second geometric center point

Claims (12)

A method for assembling an image capturing module, comprising the steps of: providing an image sensing unit and an actuator unit, wherein the image sensing unit comprises an image sensing wafer, and the actuator unit A frame housing having a predetermined positioning point or a predetermined positioning line and a movable lens assembly movably disposed within the frame housing; applying a predetermined energy to drive the actuator unit such that a central position of the movable lens assembly is offset relative to the predetermined positioning point or the predetermined positioning line of the frame housing to a fixed offset position to obtain the predetermined positioning point from the frame housing Or a predetermined horizontal direction of the predetermined positioning line to the central position of the movable lens assembly and a predetermined horizontal distance; removing the predetermined energy; sensing a center position of the wafer relative to the image The predetermined positioning point of the frame housing or the predetermined positioning line performs a horizontal offset of a predetermined horizontal offset distance along a predetermined horizontal offset direction, wherein the predetermined level And the predetermined horizontal offset direction are two opposite directions, and the predetermined horizontal distance and the predetermined horizontal offset distance are two identical distances; and the predetermined positioning point or the predetermined at the frame housing Fixing the actuator unit to the image in a case where the positioning line has performed a horizontal offset of the predetermined horizontal offset direction and the predetermined horizontal offset distance with respect to a center position of the image sensing wafer On the sensing unit. The method for assembling the image capturing module of claim 1, wherein after the step of fixing the actuator unit on the image sensing unit, the method further comprises: applying the predetermined energy again to drive the Actuating the actuator unit such that the central position of the movable lens assembly is offset to the fixed offset position relative to the predetermined positioning point or the predetermined positioning line of the frame housing, The center position of the movable lens assembly will be exactly at the center position of the image sensing wafer. The method of assembling an image capture module of claim 2, wherein the predetermined energy is a predetermined initial electrical energy provided by the opening of an inductor switch. The method of assembling the image capturing module of claim 1, wherein the image sensing unit comprises a circuit substrate for carrying the image sensing chip, and the top end of the image sensing chip has an image sense Measuring area, and the image sensing area has a first geometric center line, wherein the frame housing of the actuator unit is disposed on the circuit substrate of the image sensing unit, the movable The lens assembly has a second geometric centerline, and the predetermined alignment line of the frame housing is a third geometric centerline. The method of assembling an image capturing module of claim 4, wherein the predetermined horizontal distance is the second geometric center line of the movable lens assembly and the third geometric center of the frame housing a distance formed between the two lines, and the predetermined horizontal offset distance is both the third geometric center line of the frame housing and the first geometric center line of the image sensing area The distance formed between the two. The method for assembling the image capturing module of claim 4, wherein after the step of fixing the actuator unit on the image sensing unit, the method further comprises: applying the predetermined energy again to drive the Actuating the actuator unit such that the second geometric centerline of the movable lens assembly is again offset relative to the third geometric centerline of the frame housing to the fixed offset position, whereby The second geometric centerline of the movable lens assembly will accurately align with the first geometric centerline of the image sensing region. The method of assembling the image capturing module of claim 1, wherein the image sensing unit comprises a circuit substrate for carrying the image sensing chip, and the top end of the image sensing chip has an image sense Measuring area, and a top end of the image sensing area has a first geometric center point, wherein the frame of the actuator unit a frame housing is disposed on the circuit substrate of the image sensing unit, the movable lens assembly has a second geometric center point, and the predetermined positioning point of the frame housing is a third geometric center point. The method of assembling an image capture module of claim 7, wherein the predetermined horizontal distance is the second geometric center point of the movable lens assembly and the third geometric center of the frame housing a distance formed between the two, and the predetermined horizontal offset distance is both the third geometric center point of the frame housing and the first geometric center point of the image sensing area The distance formed between the two. The method of assembling the image capturing module of claim 7, wherein after the step of fixing the actuator unit on the image sensing unit, the method further comprises: applying the predetermined energy again to drive the Actuating the actuator unit such that the second geometric center point of the movable lens assembly is offset again to the fixed offset position relative to the third geometric center point of the frame housing, whereby The second geometric center point of the movable lens assembly will be exactly at the first geometric center point of the image sensing wafer. The method of assembling an image capturing module of claim 1, wherein the predetermined positioning point or the predetermined positioning line of the frame housing is disposed at an edge of the frame housing. An image capturing module includes an image sensing unit, and the image sensing unit includes a circuit substrate and an image sensing chip disposed on the circuit substrate and electrically connected to the circuit substrate. Wherein the top end of the image sensing wafer has an image sensing area; and an actuator unit, the actuator unit includes a frame housing disposed on the image sensing unit and a movable arrangement a movable lens assembly in the frame housing; wherein the image sensing area has a first geometric center line, the movable The lens assembly has a second geometric centerline, and after the actuator unit is applied with a predetermined energy, the second geometric centerline of the movable lens assembly will be accurately positioned in the image sensing region The first geometric centerline. An image capturing module includes an image sensing unit, and the image sensing unit includes a circuit substrate and an image sensing chip disposed on the circuit substrate and electrically connected to the circuit substrate. Wherein the top end of the image sensing wafer has an image sensing area; and an actuator unit, the actuator unit includes a frame housing disposed on the image sensing unit and a movable arrangement a movable lens assembly within the frame housing; wherein the image sensing region has a first geometric center point, the movable lens assembly has a second geometric center point, and when the actuator unit is After applying a predetermined amount of energy, the second geometric center point of the movable lens assembly will be accurately aligned with the first geometric center point of the image sensing region.