TWI636291B - Lens installation device - Google Patents

Abstract

A lens mounting device for mounting a lens to a lens mounting position in a lens barrel, and comprising a base, a lens barrel housing, a piezoelectric lifting assembly, a lens adjusting assembly and a beam correcting assembly; and the piezoelectric lifting assembly includes a lifting drive Components, lifting platforms and piezoelectric power components. The lens adjustment assembly includes a plurality of piezoelectric actuation elements and lens contact elements; the lens contact elements are driven by the piezoelectric actuation elements to contact the lens. The beam correcting assembly includes a beam generating element and a beam sensing element. The beam generating component projects a correcting beam that penetrates the lens; the beam sensing component is disposed on the lifting platform for detecting the projected position of the correcting beam. Wherein, the piezoelectric actuating element drives the lens contact element to push the lens to the lens mounting position to adjust the projection position to a reference projection position.

Description

Lens mounting device

The present invention relates to a lens mounting device, and more particularly to a lens mounting device that uses a piezoelectric element to drive a lens contact member to push a lens and correct the light beam.

Photographic technology has evolved since the early nineteenth century, from the earliest film cameras to modern digital cameras. In recent years, consumer electronic products have been continuously introduced, and cameras have become an indispensable product in life. Compared with the lenses used in the film era, the reduction of the size of the photosensitive elements has led to the miniaturization of lenses and the increasing optical quality requirements, so the manufacturing process will be even more Precision. In the production process, the quality requirements for lens assembly are becoming more and more stringent and play an extremely important role in the entire assembly technology.

In order to produce a camera of good quality, the optical lens plays a crucial role in the positioning accuracy of the lens barrel. Please refer to the first figure, which is a schematic cross-sectional view showing the state of use of the first lens positioning and mounting device of the prior art. As shown, in the prior art, a way of positioning a lens in a lens barrel is still widely used. First, a lens PA1 is placed in the lens barrel PA2, and the top lens PA1 is pushed by a ejector element PA3 having a concave cylindrical structure. The lens PA1 is flat on the lens PA1 by the concave cylindrical structure of the ejector element PA3. Apply force and automatically align the center.

Although the method is simple in technology and low in cost, the positioning accuracy during assembly is low, and since the force applied to each pressed portion of the lens PA1 cannot be individually adjusted, the ejector element PA3 is likely to scratch or fracture the lens PA1. . That is to say, when the ejector element PA3 applies a force to the lens PA1, it is likely that the force applied point is too concentrated or the force applied to each pressed portion of the lens PA1 is too large, so that the end with a large force is easily broken. .

In addition, another lens positioning technology is also widely used. Please refer to the second figure, which is a schematic diagram showing the state of use of the second lens positioning and mounting device of the prior art. As shown, the lens PA1 is first fixed in a lens barrel PA2a by a lens clamping member PA4. Next, the lens barrel external thread PA21a of a lens barrel PA2a and a plurality of at least three screws PA5 (only one of which is indicated here) protruding from the periphery of the lens barrel PA2a toward the lens barrel PA2a are mutually fixed by The locking depth and the height of the lens barrel PA2a are adjusted to the locking depth and the height of the lens barrel external thread PA21a, whereby the lens PA1 is positioned at an appropriate position in the lens barrel PA2a.

This method has the advantages of being simple in technology and low in cost as in the first method, but in order to adjust the lens PA1 to an appropriate position, it is necessary to constantly adjust the tilt angle and height of the lens barrel PA2a by adjusting the screw PA5, and It is difficult to know the positioning condition of the lens PA1. Therefore, not only the operation is complicated and inconvenient, but also the positioning of the lens PA1 cannot be accurately determined. In addition, the screw PA5 is easily deformed after being used for a period of time, and thus the accuracy of the mounting of the lens PA1 is significantly affected. Generations like ever-increasing precision are no longer available.

In view of the prior art, the first lens mounting method cannot accurately mount the lens to an appropriate position not only when the lens is mounted to the lens barrel, but also because the force applied to each pressed portion of the lens cannot be individually adjusted. Therefore, it is easy to cause scratch or fracturing of the lens. In addition, in the second lens operation method in which the operation is complicated, in addition to the fact that the positioning of the lens in the lens barrel cannot be confirmed, the accuracy of lens mounting is too low because the screw is easily deformed.

The present invention solves the problems of the prior art, and the necessary technical means is to provide a lens mounting device for mounting a lens in a mounting direction to a lens mounting position in a lens barrel, and comprising a base, a A lens barrel housing, a piezoelectric lifting assembly, a lens adjusting assembly and a beam correcting assembly. The lens barrel housing is mounted on the base and is provided with a lens barrel setting portion for placing the lens barrel.

The piezoelectric lifting assembly comprises a lifting and transmitting component, a lifting platform and a piezoelectric power component, and the lifting and transmitting component extends from the base plate in an extending direction opposite to the mounting direction; the lifting platform is coupled to the lifting and transmitting component in a lifting manner; The piezoelectric power element drives the lifting and transmitting element to move the lifting platform in the extending direction and the mounting direction. The lens adjustment assembly includes a plurality of piezoelectric actuation elements and a lens contact element, and the piezoelectric actuation element is disposed on the lifting platform. The lens contact element is driven by the piezoelectric actuator to contact the lens.

The beam correcting component includes a beam generating component and a a beam sensing component, the beam generating component projecting a correcting beam that passes through the path along a path of the beam; the beam sensing component is located in the beam path and has a reference projection position for detecting the penetrating lens Correcting the beam induces a projected position. Wherein the piezoelectric actuating element drives the lens contact element such that the lens contact element pushes the lens to the lens mounting position and deflects the lens to adjust the projected position to the reference projection position.

The lens contact member has a cylindrical structure. The cylindrical structure can preferably adjust the lens so that the lens contact member can accurately adjust the lens to various angles.

The beam generating element is a laser source generator. Because the laser light has a straight light exit path, the projection position of the correction beam projected by the beam sensing element can be measured more accurately. The beam sensing element is an optical axis sensor. The optical axis sensor can accurately detect the projection position, thereby knowing the positioning of the lens position.

The piezoelectric power element is a piezoelectric motor. The piezoelectric motor has the advantages of small size, light weight and fast response, and has the characteristics of immediate movement and stop, so that the lifting and transmitting components can be accurately driven and the lifting platform can be accurately moved to a predetermined position. Each piezoelectric actuator is a piezoelectric actuator. Because the piezoelectric actuator has the advantages of small size, light weight and fast response, and has the characteristics of immediate movement and stop, the lens contact element can be precisely driven to finely adjust the positioning position and angle of the lens.

The piezoelectric lifting assembly further comprises a lifting height sensing component, and the lifting height sensing component is coupled to the lifting platform for measuring the lifting height of the lifting platform on the lifting transmission component. Lift height sensing component package Contains a magnetic ruler, an optical ruler or an encoder. Because the magnetic ruler, optical ruler or encoder can detect extremely small position changes, it is suitable for use in lens mounts with extremely high precision requirements.

The lift drive element comprises a screw, a slide rail or a linear guide. Screws, slides or linear guides can move the lifting platform in a straight line. The piezoelectric lifting assembly further includes a lifting drive plate coupled to the lifting transmission member and driven by the piezoelectric power element to move the lifting platform on the lifting transmission member.

The lens mounting device further includes a control module electrically connected to the beam sensing component, the piezoelectric actuator component and the piezoelectric power component, and the projection position is controlled by controlling the piezoelectric actuator component and the piezoelectric power component Adjust to the reference projection position so that the lens is adjusted to the lens mounting position.

In summary, the lens mounting device provided by the present invention uses a piezoelectric power element to drive the lifting and lowering of the lifting platform, and then uses the piezoelectric actuator to drive the lens contact element, and according to the projected position sensed by the beam correcting component, The lens in the lens barrel is adjusted to the lens mounting position.

In view of the problem of low precision of prior art adjustment, the present invention can accurately sense the deflection state of the lens by the beam correcting component, and utilizes the characteristics of rapid response and immediate stop of the piezoelectric actuator and the piezoelectric actuator. This allows the lens to be accurately positioned at the lens mounting position. Moreover, since the piezoelectric actuator element can individually adjust the magnitude of the force applied to each part of the lens, the problem that the prior art is liable to cause scratching or fracturing of the lens is avoided. And with the operation of the control module, the lens installation automation can be realized. The function avoids the complicated problem of operation.

PA1‧‧ lens

PA2, PA2a‧‧ lens barrel

PA21a‧‧‧ lens barrel external thread

PA3‧‧‧Pushing element

PA4‧‧‧ lens clamping element

PA5‧‧‧ screws

1‧‧‧ lens mounting device

11‧‧‧Abutment

111‧‧‧Linear guide

12‧‧‧Lens tube housing

121‧‧‧foot stand

122‧‧‧ lens barrel setting section

13‧‧‧Piezo lift assembly

131‧‧‧ Lifting transmission components

132‧‧‧ Lifting platform

1321‧‧‧ Platform Link

13211‧‧‧Drive screw hole

133‧‧‧ Lifting drive

134‧‧‧Piezoelectric components

135‧‧‧ Lifting height sensing element

14‧‧‧ lens adjustment assembly

141‧‧‧ Piezoelectric actuating components

142‧‧‧Lens contact elements

15‧‧‧beam correction component

151‧‧‧beam generating components

152‧‧‧beam sensing element

16‧‧‧Control Module

2‧‧‧ lens

3‧‧‧ lens tube

A‧‧‧ beam path

L‧‧‧ lens mounting position

L‧‧‧Correct beam

N1‧‧‧Installation direction

N2‧‧‧ extending direction

P1‧‧‧ reference projection position

P2‧‧‧projection position

S‧‧‧ erect space

The first figure shows a schematic cross-sectional view showing the state of use of the first lens positioning and mounting device of the prior art; the second figure shows a schematic view of the state of use of the second lens positioning and mounting device of the prior art; A perspective view of a lens mounting device provided by an embodiment; a fourth perspective view showing a lens mounting device according to a preferred embodiment of the present invention; and a fifth perspective view showing a preferred embodiment of the present invention. FIG. 6 is a schematic diagram showing a connection diagram of a control module of a lens mounting device; FIG. 6 is a cross-sectional view showing the AA of the third embodiment; and FIG. 7 is a view showing the working state of the lens mounting device provided by the preferred embodiment of the present invention after being placed in a lens. FIG. 8 is a cross-sectional view showing the working state of the lifting platform of the lens mounting device provided by the preferred embodiment of the present invention; and FIG. 9 is a view showing the adjustment of the lens mounting device provided by the preferred embodiment of the present invention. Schematic diagram of the working state after the lens.

Please refer to the third to sixth figures together. The third figure shows a stereoscopic diagram of the lens mounting device provided by the preferred embodiment of the present invention. FIG. 4 is a perspective view showing a lens mounting device according to a preferred embodiment of the present invention. FIG. 5 is a perspective view showing a control module connection relationship of a lens mounting device according to a preferred embodiment of the present invention. Schematic; the sixth figure shows a schematic view of the AA section of the third figure. As shown in the figure, a preferred embodiment of the present invention provides a lens mounting device 1 for mounting a lens 2 (labeled in the seventh figure) in a mounting direction N1 to a lens barrel 3 (labeled in the seventh figure). a lens mounting position I (indicated in the seventh figure), and includes a base 11, a lens barrel housing 12, a piezoelectric lifting assembly 13, a lens adjusting assembly 14, a beam correcting assembly 15 and a Control module 16.

A linear guide 111 is provided on the base 11. The lens barrel housing 12 is mounted on the base 11 through four legs 121 (only one of which is shown here), thereby forming a standing space S between the lens barrel housing 12 and the base 11. Further, the lens barrel housing 12 is provided with a lens barrel setting portion 122 for placing the lens barrel 3. The lens barrel setting portion 122 is generally a cylindrical space for placing the lens barrel 3.

The piezoelectric lifting assembly 13 includes a lifting and lowering drive member 131, a lifting platform 132, a lifting and lowering driving plate 133, a piezoelectric power element 134 and a lifting height sensing element 135. The lifting and lowering transmission member 131 extends from the base 11 in an extending direction N2 opposite to the mounting direction N1. In the present embodiment, the lifting and lowering transmission member 131 includes a screw and is pivotally disposed in the linear guide 111. In other embodiments, the lift transmission component 131 can include a slide rail or a linear guide rod, but is not limited thereto.

The lifting platform 132 is coupled to the lifting and transmitting element 131 in a liftable manner. Explaining in more detail, the lifting platform 132 includes a platform connecting block 1321, a driving screw hole 13211 is disposed in the platform connecting block 1321, and the lifting and transmitting element 131 is screwed to the driving screw hole 13211. When the lift transmission member 131 is driven to rotate, the linear guide 111 limits the platform coupling block 1321, preventing the platform coupling block 1321 from rotating with the elevation transmission member 131. Therefore, the platform coupling block 1321 causes the movement of the mounting direction N1 and the extending direction N2 due to the rotation of the lifting and lowering transmission member 131. Briefly, the linear guide 111 can move the lifting platform 132 in a straight line direction while avoiding unnecessary rotation or misalignment.

The lift drive disk 133 is a lift drive disk which is disposed below the base 11 in this embodiment. The lift drive plate 133 is coupled to the lift drive member 131 and is driven by the piezoelectric power element 134 to move the lift platform 132 in the lift drive member 131. More specifically, the center of the lift drive plate 133 is coupled to the lift transmission member 131, and when the lift drive plate 133 is rotated by the piezoelectric power element 134, the lift drive member 131 is also rotated.

In other words, the piezoelectric power element 134 drives the lift drive plate 133 to drive the lift transmission member 131 to move the lift platform 132 in the mounting direction N1 and the extending direction N2. The piezoelectric power element 134 is a piezoelectric motor, and is disposed under the base 11 in this embodiment. The piezoelectric motor is also called ultrasonic motor. The piezoelectric motor has the advantages of small size, light weight and fast response, and it has the characteristics of immediate stop and stop, so it can accurately drive the lifting and transmitting component 131 and control the lifting platform 132. The ground is moving to a predetermined position. In addition, the lifting height sensing element 135 is coupled to the lifting platform 132 for measuring the lifting height of the lifting platform 132. In this embodiment, the lifting height sensing element 135 comprises a magnetic force ruler. In other embodiments, the lifting height sensing element 135 may include an optical scale or an encoder, but is not limited thereto. Since the magnetic ruler can detect extremely fine positional changes, it is suitable for use in the lens mounting device 1 which is extremely precise.

The lens adjustment assembly 14 includes three piezoelectric actuation elements 141 (here only one of which is labeled) and a lens contact element 142. The three piezoelectric actuator elements 141 are disposed below the lifting platform 132 and are respectively disposed at three corners of the equilateral triangle. Each of the piezoelectric actuator elements 141 is a piezoelectric actuator. Since the piezoelectric actuator has the advantages of small size, light weight, fast response, and the like, and has the characteristics of immediate stop, the lens contact member 142 can be accurately driven, thereby finely adjusting the positioning position of the lens 2 in the lens barrel 3. With angles.

The lens contact element 142 is driven by the piezoelectric actuator element 141 to contact the lens 2. Incidentally, since the piezoelectric actuator elements 141 are respectively disposed at three corners of the equilateral triangle, the inclination angle of the lens contact member 142 in the three-dimensional space can be controlled freely without dead angle. In addition, the lens contact member 142 has a cylindrical structure. The cylindrical structure can preferably adjust the lens 2 so that the lens contact member 142 can accurately adjust the lens 2 to various angles. In the present embodiment, the lens contact element 142 is suspended from the lifting platform 132 by the piezoelectric actuator element 141. In other embodiments, the lower half of the lifting platform 132 can extend an extension having a port, and the piezoelectric actuator 141 can be disposed above the extension of the lifting platform 132 and supported upwardly. Connected to the lens contact element 142. The lens contact member 142 is bored in the port and is driven by the piezoelectric actuator 141 to contact the lens 2.

The beam correcting assembly 15 includes a beam generating element 151 and a beam sensing element 152. The beam generating element 151 is a standing space S disposed on the base 11, and projects a correcting beam L that penetrates the lens 2 along a path of the beam A (shown in the seventh to ninth figures). In the seventh to ninth). Wherein, the beam generating element 15 is a laser light source generator, because the laser light has a straight light exiting path, thereby more accurately observing the position where the measuring correcting beam L is projected, the size of the projected area and the shape of the projected area.

The beam sensing component 152 is disposed on the lifting platform 132 along the beam path A, and is provided with a reference projection position P1 (labeled in the seventh figure) for detecting the correction beam L of the penetrating lens 2 to induce a projection. Position P2 (marked in the seventh picture). It is worth mentioning that the beam sensing component 152 can further detect the size of the projection area and the shape of the projection area of the correction beam L on the beam sensing element 152. The projection position P2 of the correction beam L, the size of the projection area, and the shape of the projection area are closely related to the deviation angle of the lens 2, the position of the deviation, or the type of the lens 2. In addition, in the embodiment, the beam sensing element 152 is an optical axis sensor. The optical axis sensor 152 can accurately detect the projection position P2, the size of the projection area, and the shape of the projection area, thereby knowing the positioning condition of the lens 2 in the lens barrel 3.

In the present embodiment, the light beam generating element 151 is disposed on the base 11 and the light beam sensing element 152 is disposed on the lifting platform 132. However, in other embodiments, the beam generating element 151 and the beam sensing element 152 can be displaced from each other. That is, the beam generating element 151 is disposed on the lifting platform 132, and the beam sensing element 152 is disposed on the base 11.

The control module 16 is electrically connected to the piezoelectric power component 134, the lift height sensing component 135, the piezoelectric actuator component 141 and the beam sensing component 152, and by controlling the piezoelectric power component 134 and the piezoelectric actuator component 141, Referring to the displacement change data returned by the lift height sensing element 135, the projection position P2 is adjusted to the reference projection position P1, and the lens 2 is adjusted to the lens mounting position I. That is, the piezoelectric actuator element 141 drives the lens contact element 142 such that the lens contact element 142 pushes the lens 2 to the lens mounting position I and steers the lens 2, thereby adjusting the projection position P2 to the reference projection. Position P1. The control module 16 can be a control circuit, a control chip or a smart control device, and the control module 16 can be used to raise and lower the height by using a smart control strategy such as a neural network and a fuzzy neural network. The signal and data returned by the sensing element 135 and the beam sensing element 152 are processed, and the piezoelectric power element 134 and the piezoelectric actuator element 141 are controlled.

Please refer to the seventh drawing, which is a cross-sectional view showing the working state of the lens mounting device provided by the preferred embodiment of the present invention after the lens is placed. As shown in the figure, the lens 2 is first placed in the lens barrel 3, and since the position of the lens 2 has not been adjusted, the lens 2 is not accurately mounted at the lens mounting position I. Therefore, the projection position P2 projected by the correction beam L refracted by the lens 2 on the beam sensing element 152 is not aligned with the reference projection position P1. Explaining in more detail, the correcting light beam L generated from the light beam generating element 151 will first pass through the lens 2 in the lens barrel 3 of the lens barrel setting portion 122 along the beam path A. After the correction beam L is refracted by the lens 2, it is projected onto the beam sensing element 152 via the lens contact element 142 which is a cylindrical structure. Projection position at this time P2 is not the same as the reference projection position P1.

Please refer to FIG. 8 , which is a cross-sectional view showing the working state of the lifting platform of the lens mounting device provided by the preferred embodiment of the present invention. As shown, power is generated by the piezoelectric power element 134 and transmitted through the lift drive plate 133 and the lift transmission member 131 such that the lift platform 132 moves on the lift transmission member 131 in the mounting direction N1. Thereby, the lens contact member 142 is brought close to and touched to the lens 2.

Please refer to the ninth drawing, which is a cross-sectional view showing the working state of the lens mounting device according to the preferred embodiment of the present invention after adjusting the lens. As shown, after the lens contact element 142 is pressed against the lens 2, the piezoelectric actuator 141 adjusts the contact angle of the lens contact element 142 in three dimensions, and the lens 2 is precisely adjusted to lens mounting. The position I (indicated in the seventh figure) is such that the projection position P2 (indicated in the seventh figure) coincides with the reference projection position P1, that is, the correction beam L is projected at the reference projection position P2. Incidentally, the position of the lens 2 in the lens barrel 3 can also be determined by correcting the size and shape of the beam projection area of the beam L on the beam sensing element 152.

In summary, the lens mounting device provided by the present invention determines the position of the lens in the lens barrel by correcting the state of the light beam on the light beam sensing element. The piezoelectric platform is then used to drive the lifting platform, and the piezoelectric actuator is used to fine tune the contact angle of the lens contact member to the lens. Thereby, the lens can be precisely adjusted and the appropriate lens mounting position can be set.

Compared with the prior art, the lens mounting device provided by the present invention has a short response time by the piezoelectric power element and the piezoelectric actuator element. Features that precisely mount the lens in the lens mounting position. And by controlling the operation of the module, the function of lens mounting automation can be realized. In this way, problems such as scratching or fracturing of the lens, inability to know the lens positioning state, complicated operation, and low installation accuracy can be avoided in the prior art.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

Claims (10)

A lens mounting device for mounting a lens in a mounting direction to a lens mounting position in a lens barrel, and comprising: a base; a lens barrel receiving member mounted on the base and configured a lens barrel setting portion for placing the lens barrel; a piezoelectric lifting assembly comprising: a lifting and lowering drive member extending from the base plate in an extending direction opposite to the mounting direction; and a lifting platform The lifting and lowering component is coupled to the lifting and lowering component; a piezoelectric power component drives the lifting and transmitting component to move the lifting platform along the extending direction and the mounting direction; and a lifting height sensing component is coupled to the lifting and lowering a platform for measuring the lifting height of the lifting platform at the lifting transmission component; a lens adjusting component comprising: a plurality of piezoelectric actuation elements disposed on the lifting platform; and a lens touch component being subjected to the pressure An electrically actuated component is driven to contact the lens; and a beam correcting component comprising: a beam generating component that projects a beam of light along the path through the lens a correcting beam; and a beam sensing component located in the beam path, having a reference projection position for detecting a correction beam passing through the lens to induce a projection position; wherein the piezoelectric actuation The component drives the lens contact element to cause the A lens contact element pushes the lens to the lens mounting position and turns the lens to adjust the projected position to the reference projection position. The lens mounting device of claim 1, wherein the lens contact member is a cylindrical structure. The lens mounting device of claim 1, wherein the beam generating element is a laser light source generator. The lens mounting device of claim 1, wherein the piezoelectric power component is a piezoelectric motor. The lens mounting device of claim 1, wherein the beam sensing element is an optical axis sensor. The lens mounting device of claim 1, wherein each of the piezoelectric actuators is a piezoelectric actuator. The lens mounting device of claim 1, wherein the lifting height sensing component comprises at least one of a magnetic ruler, an optical scale and an encoder. The lens mounting device of claim 1, wherein the lifting and lowering transmission component comprises at least one of a screw, a slide rail and a linear guide. The lens mounting device of claim 1, wherein the piezoelectric lifting assembly further comprises a lifting drive plate coupled to the lifting transmission component and driven by the piezoelectric driving component, thereby causing the lifting The platform moves on the lift transmission element. The lens mounting device of claim 1, further comprising a control module electrically connecting the beam sensing component, the piezoelectric actuator component and the piezoelectric power component, and controlling the The piezoelectric actuator and the piezoelectric power element adjust the projection position to the reference projection position to adjust the lens to the lens mounting position.