KR100636006B1 - Optic axis adjustment device - Google Patents

Abstract

An optical axis adjuster using reflected light for a high resolution multi-focus lens is provided to quickly adjust the optical axis of the multi-focus lens by displaying error points of first to third lenses and an ideal optical axis point of the third lens on a display. A base unit(10) is formed on a base plate. A lens module is mounted on a jig base, which is installed on the upper end of a tower. An adjusting unit is installed on the base plate and adjusts the optical axis of a third lens. A laser diode(30) generates monochrome light. A light splitter(31) splits the light from the laser diode and passes reflected light from an opposite side. First and second mirrors refract the passed light toward the lens module and supply the reflected light back to the light splitter. A relay lens is installed at the middle portion of a single-axis movement. A CCD(Charge Coupled Device) camera includes a CCD sensor and takes an image of a reflected light incident on the CCD sensor. A controller(40) displays optical axis points of the first and second lenses and an error point of the third lens on a monitor, calculates an ideal optical axis point of the third lens, and displays the ideal optical axis point on the monitor.

Description

Optical axis adjustment device for high-pixel multifocal lenses using reflected light

1 is a view showing an optical axis adjusting device for a high-pixel multifocal lens using the reflected light of the present invention.

2 is a view for explaining the principle of optical axis adjustment.

3 is a view showing an optical axis and an error point display state displayed on the monitor of the present invention.

4 is a front view showing an embodiment of the present invention.

5 is a side view showing an embodiment of the present invention.

6 is a view showing in detail the components of the adjustment member applied to the present invention.

Figure 7 is a bottom view showing a state in which the adjustment member applied to the present invention is coupled.

Figure 8 is a side view showing an operating state of the adjustment member applied to the present invention.

9 is a view for explaining the necessity of optical axis adjustment of a high pixel multifocal lens.

Explanation of symbols for main parts of the drawings

1: lens module, 3 ~ 5: lens,

10: base member, 11: tower,

12: base plate, 13: jig base,

20: adjusting member, 21: vertical axis,

22: adjusting plate, 24: contact rod,

25; Presser, 27: mounting jig,

30: laser diode, 31: beam splitter,

32: collimator lens, 33,34: mirror,

35: relay lens, 39a: CCD sensor,

39: CCD camera, 40: control unit,

41: monitor, 43: air spring pattern,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical axis adjusting device for high pixel multifocal lenses using reflected light, and more particularly, to an optical axis adjusting device for high pixel multifocal lenses using reflected light, which enables the optical axis of a lens constituting a lens module to be adjusted accurately and quickly. .

The high-pixel (megapixel) multifocal glass lens has an aspherical surface to increase transmittance and refractive index, and is a key component that enables high quality and miniaturization of optical modules.

These high-pixel multifocal lenses are widely applied to high-pixel mobile phones, cameras, CD and DVD players, laser printers, and projectors, and are essential parts that influence the performance of the products.

High-pixel multifocal lenses can be divided into plastic products and glass (glass) products, which are increasingly used because plastic products have lower resolution than glass products.

In addition, the high-pixel multifocal lens mainly includes first to third lenses having different transmittances and refractive indices inside the barrel, and when manufactured, the first lens and the second lens are embedded in the barrel in close contact with each other and the upper side thereof. The third lens is assembled and assembled.

In the case of the lens module assembled as described above, when the optical axes of the first to third lenses exist in a straight line as shown in (b) of FIG. 6, a high quality image may be obtained. When the optical axis of the third lens is distorted, it is impossible to obtain a high quality image such as blurring of image quality.

However, since a device for adjusting the optical axis of the lenses constituting the lens module of the high-pixel multifocal lens assembled in the production line is not provided in the related art, it is difficult to accurately match the optical axis of the produced and assembled lens module. Defects are frequently generated, and a lot of time is spent on adjusting the optical axis of the lens module, which causes a problem in that the productivity of the product is significantly reduced.

Accordingly, the present invention for solving the above problems is a base member which is formed on the base plate is mounted on the fixed height of the top of the tower jig base on which the lens module to be the optical axis adjustment target is mounted; An adjustment member installed on an upper side of the base plate to move the third lens of the lens module up, down, left, and right to adjust the optical axis; Light supply means for supplying a light source to the lens module; Using the reflected light reflected from the lens constituting the lens module, the optical axis points of the first to third lenses are detected and displayed, and an error point of the third lens to be adjusted is outputted to the screen. Means for adjusting the optical axis of the lens; It is an object of the present invention to provide an optical axis adjusting device for a high-pixel multifocal lens using reflected light to adjust the optical axis of the lens constituting the lens module accurately and quickly.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 8.

The present invention for achieving the above object,

A base member 10 having a jig base 13 on which the lens module 1 as an optical axis adjustment target is mounted is formed on the base plate 12 installed at a predetermined height of the top of the tower 11;

An adjustment member 20 installed on an upper side of the base plate 12 to move the third lens 5 of the lens module 1 up, down, left, and right to adjust the optical axis;

A laser diode 30 for generating monochromatic light;

A beam splitter 31 which separates the light generated by the laser diode 30 and passes the reflected light supplied from the opposite side;

A collimator lens 32 for converting the light passing through the beam splitter 31 into linear light;

The linear light passing through the collimator lens 32 is refracted toward the lens module 1 of the jig base 13, and the light reflected from the lens module 1 is supplied to the beam splitter 31 again. First and second mirrors 33 and 34;

It is installed in the middle of the single-axis movement 42 so that the vertical movement can be performed by the power of the step motor 37, and the light reflected by the second mirror 34 is focused toward the lens module 1, and the lens A relay lens 35 for supplying the reflected light reflected from the module 1 to the beam splitter 31 through the mirrors 33 and 34;

A CCD camera 39 which detects the reflected light passing through the beam splitter 31, and captures the reflected light detected by the CCD sensor 39a;

An ND filter 38 for adjusting the intensity of the reflected light incident on the CCD sensor 39a;

The third lens while displaying the optical axis points P1 and P2 of the first and second lenses 3 and 4 and the error points of the third lens 5 captured by the CCD camera 39 on the monitor 41. A control unit 40 for calculating the ideal optical axis point P3 of (5) and displaying it on the monitor 41;

It consists of.

In addition, the adjustment member 20 is formed by standing the vertical axis 21 on one side of the base plate 12, the adjustment plate 22 in the upper portion of the vertical axis 21 is guided by the L guide (26) up and down It is formed horizontally to allow movement, a plurality of first coupling grooves 271 and the pressing portion 25 for the contact bar 24 is coupled to the bottom of the adjustment plate 22 as shown in Figure 6 (a) ) Is coupled to the mounting jig 27 is provided with a second coupling groove 272 for coupling,

The contact rod 24 which is in close contact with the edge of the third lens 5 is coupled to the first coupling groove 271 of the mounting jig 27, and the lens module 1 is attached to the second coupling groove 272. It is characterized by combining the pressing portion 25 for pressing.

In addition, as shown in (b) and (c) of FIG. 6, the contact rod 24 forms an inclined portion 241 so as to be inclined downward by a predetermined angle, and a first end of the inclined portion 241 is formed at an end thereof. 3 forms a contact portion 242 for contacting the edge of the lens 5,

As shown in (d) (e) of FIG. 6, the pressing part 25 is coupled to the front end by pressing the pressing rod 251 in the vertical direction, and a soft rubber at the lower end of the pressing rod 251. Forming a close contact portion 253 consisting of, the pressing rod 251 is characterized in that the pressing rod 251 to elastically press the lens module 1 through the coil spring 252. .

On the other hand, the air spring pad 43 is formed on the bottom of the base on which the optical axis adjusting device of the present invention is installed, so that the air spring pad 43 is cushioned even when minute vibrations are applied from the outside, so that the lens has a high precision in the unit of μm. To adjust the optical axis.

In addition, the relay lens 35 is connected to the coupling portion 36 which is inserted into the single-axis movement 42 and is coupled, and forms a screw portion on the inner circumferential surface of the coupling portion 36, and the inside of the single-axis movement 42 The screw shaft for driving the relay lens 35 up and down by being rotated forward and backward by the step motor 37 while being engaged with the screw portion is embedded.

Referring to the operation of the present invention configured as described above is as follows.

First, the first lens 3 and the second lens 4 are fixed to the lower end of the barrel 2, and the third lens 5 is fixed to the upper end of the lens module 1 to be adjusted to the optical axis. It is assembled to be movable.

When the lens module 1 is inserted into the lens fixing part 14 seated on the jig base 13 of the base member 10 and then the adjustment plate 22 is lowered, it is coupled to the mounting jig 27. The pressing rod 251 of the pressing part 25 is pressed to fix the lens module 1 mounted on the lens fixing part 14.

That is, the contact portion 253 formed of the soft rubber formed on the lower portion of the pressing bar 251 is in contact with the lens module 1 and the lowering operation of the adjustment plate 22 is stopped, so that the spring 252 The lens module 1 is pressed and fixed to the close contact portion 253 by the elastic force.

Then, as the mounting jig 27 descends, the contact portion 242 of the contact rod 24 is closely attached to the outer side of the third lens 5 assembled on the barrel 2 as shown in FIGS. 7 and 8. Will be.

When the laser diode 30 is turned on in this state, the monochromatic light is generated in the laser diode 30 and irradiated to the beam splitter 31, and the beam splitter 31 separates the light source of the monochromatic light supplied to the collimator. The collimator lens 32 converts the separated light source into linear light.

The linear light passing through the collimator lens 32 is refracted through the first mirror 33 and the second mirror 34 facing each other to face the lens module 1, and the second mirror ( The light source reflected by 34 is collected by the relay lens 35 and supplied to the first to third lenses 3 to 5 of the lens module 1 mounted on the jig base 13.

At this time, if the operator operates a separate switch, the step motor 37 is driven by the operation of the control device not shown to perform a scan operation to gradually raise the relay lens 35 from below.

As the height of the relay lens 35 is increased by the scanning operation, the light source collected by the relay lens 35 is first supplied to the first lens 3, and then the second lens 4 and the first lens are sequentially formed. 3 is supplied to the lens (5).

Accordingly, the first lens 3 to the third lens 5 sequentially reflect the light collected by the relay lens 35, and the reflected light is relay lens 35 → second mirror 34 →. The ND filter 38 provided in front of the CCD camera 39 is reflected light that moves in the order of the first mirror 33 → collimator lens 32 → beam splitter 31 and passes through the beam splitter 31. By the incident light intensity is supplied to the CCD camera 39.

The CCD sensor 39a, which is built in the CCD camera 39, measures the error points of the optical axes P1 and P2 of the first lens 3, the second lens 4 and the third lens 5 from the reflected light. The control unit 40 detects and supplies the optical axis points P1 and P2 and the error points supplied from the CCD camera 39 to the monitor 41 and simultaneously with the first lens 3. ) And the optical axis point P3 of the third lens 5 are calculated using the optical axis points P1 and P2 position information of the second lens 4 to be displayed on the monitor 41 as shown in FIG. 3. do.

Here, when the control unit 40 explains the principle of calculating the ideal optical axis point P3 of the third lens 5,

As illustrated in FIG. 2, the first lens 3, the second lens 4, and the third lens 5 are sequentially arranged, and the optical axis point position coordinates of the first lens 3 are “P1 (X1, Y1)”. ", The optical axis point position coordinate of the second lens 4 is" P2 (X2, Y2) ", and the optical axis point position coordinate of the third lens 5 is" P3 (X3, Y3) ", and arbitrary positions Assuming that the distances to the optical axes of the first to third lenses 3 to 5 are D1, D2, and D3 at

The optical axis point P3 (X3, Y3) of the third lens 5 is expressed as "(X3-X2) / (D3-D2) = (X2-X1) / (D2-D1)".

Accordingly, X3 = (X2-X1) / (D2-D1) * (D3-D2) + X2 of the optical axis point P3 (X3, Y3), and Y3 = (Y2-Y1) / (D2-D1) It can be found as * (D3-D2) + Y2.

That is, if the position coordinates of the first lens 3 and the second lens 4 are found using the reflected light, the ideal optical axis point P3 of the third lens 5 may be calculated and used to calculate the position coordinates. The control unit 40 performs this operation.

Meanwhile, as shown in FIG. 3, the optical axis point P3 in the ideal state with respect to the third lens 5 is displayed on the monitor 41, and at the same time, the error point reflected by the third lens 5 (the optical axis is distorted). With the wrong optical axis point detected)

When the operator adjusts a plurality of micrometers (not shown) formed on the adjustment plate 22 of the adjustment member 20, the mounting jig 27 on which the contact rod 24 is formed is moved up, down, Fine movement in the left and right directions, the movement is transmitted to the third lens 5 by the contact portion 242 at the end of the contact rod 24, the third lens 5 is finely moved, the third lens The change in the optical axis point (error point) in accordance with the change in the movement of (5) is captured by the CCD camera 39 and displayed on the monitor 41 in real time.

Therefore, the user observes the movement of the error point displayed on the monitor 41 according to the micrometa operation so that the error point overlaps with the ideal optical axis point P3, thereby forming the first to third components constituting the lens module 1. The optical axis points of the lenses 3 to 5 all coincide.

When the optical axis points of the lenses 3 to 5 coincide with each other as described above, the optical axis of the lens is fixed by applying a bond to the edge of the third lens 5 and then heating it with an infrared heating device to fix the third lens 5. The adjustment is complete.

According to the present invention operating as described above, the operator can visually check the optical axis movement state of the lens to be adjusted through a monitor, thereby making it possible to accurately and quickly adjust the optical axis of the lens.

As described above, the present invention includes: a base member formed on a base plate on which a jig base on which a lens module as an optical axis adjustment target is mounted is installed at a predetermined height of an upper end of the tower; An adjustment member installed on an upper side of the base plate to move the third lens of the lens module up, down, left, and right to adjust the optical axis; A laser diode for generating monochromatic light; A beam splitter for separating the light generated by the laser diode and passing the reflected light supplied from the opposite side; First and second mirrors for refracting the light passing through the beam splitter toward the lens module of the jig base and for supplying the light reflected from the lens module back to the beam splitter; A relay lens installed at an intermediate portion of the single-axis movement to enable vertical movement by the power of the step motor, and condensing the light reflected by the second mirror toward the lens module; A CCD camera for detecting the reflected light passing through the beam splitter, the CCD camera for photographing the reflected light detected by the CCD sensor; The lens is composed of a control unit that calculates and displays an ideal optical axis point of the third lens while displaying the optical axis points of the first and second lenses and the error points of the third lens taken by the CCD camera on the monitor. The effect of providing an optical axis adjusting device for a high-pixel multifocal lens using reflected light that can accurately and quickly adjust the optical axis of the lens constituting the module can be expected.

Claims (3)

A base member 10 having a jig base 13 on which the lens module 1 as an optical axis adjustment target is mounted is formed on the base plate 12 installed at a predetermined height of the top of the tower 11; An adjustment member 20 installed on an upper side of the base plate 12 to move the third lens 5 of the lens module 1 up, down, left, and right to adjust the optical axis; A laser diode 30 for generating monochromatic light; A beam splitter (31) for separating the light generated by the laser diode (30) and passing the reflected light supplied from the opposite side; The first light is refracted to pass through the beam splitter 31 toward the lens module 1 of the jig base 13, and the light reflected from the lens module 1 is supplied to the beam splitter 31 again. And second mirrors (33, 34); It is installed in the middle of the single-axis movement 42 so that the vertical movement can be performed by the power of the step motor 37, and the light reflected by the second mirror 34 is focused toward the lens module 1, and the lens A relay lens 35 for supplying the reflected light reflected from the module 1 to the beam splitter 31 through the mirrors 33 and 34; A CCD camera 39 which detects the reflected light passing through the beam splitter 31, and captures the reflected light detected by the CCD sensor 39a; The third lens while displaying the optical axis points P1 and P2 of the first and second lenses 3 and 4 and the error points of the third lens 5 captured by the CCD camera 39 on the monitor 41. A control unit 40 for calculating the ideal optical axis point P3 of (5) and displaying it on the monitor 41; Consists of, The adjustment member 20 is formed by standing the vertical axis 21 on one side of the base plate 12, the adjustment plate 22 on the upper portion of the vertical axis 21 is guided to the LM guide 26 is possible to move up and down And a second coupling groove 272 for coupling the plurality of first coupling grooves 271 and the pressing portion 25 to which the contact bar 24 is coupled to the bottom surface of the adjustment plate 22. ) Is equipped with a mounting jig (27), The contact rod 24 which is in close contact with the edge of the third lens 5 is coupled to the first coupling groove 271 of the mounting jig 27, and the lens module 1 is attached to the second coupling groove 272. Optical axis adjusting device for high-pixel multifocal lens using the reflected light, characterized in that the pressing portion 25 for pressing. delete According to claim 1, wherein the inclined portion 241 is formed to be inclined downward by a predetermined angle to the tip of the contact rod 24, the end of the inclined portion 241 for contacting the edge of the third lens (5) Forms a contact 242, The pressing rod 251 is coupled to the front end of the pressing portion 25 in a vertical direction, and the lower end of the pressing rod 251 forms a close contact portion 253 made of soft rubber, and the pressing rod ( 251, the optical axis adjusting device for a high-pixel multi-focus lens using the reflected light, characterized in that the pressing rod 251 to elastically press the lens module (1) via a coil spring (252).

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