KR100803468B1 - Image forming hens, and testing and controlling device for module of the image forming lens - Google Patents

Abstract

An apparatus for testing and controlling an image forming lens and an image forming lens module is provided to simply test and control the image forming lens and the image forming lens module regardless of the number of pixels. An apparatus(100) for testing and controlling an image forming lens and an image forming lens module(10) includes an infinite chart unit(120), a macrochart unit(130), a socket(141), a PCB(142), and an image unit(150). The infinite chart unit has an upper light source(121), an infinite chart(122), and a relay lens(123). The upper light source is installed in a housing(110). The infinite chart is installed apart from the upper light source. The relay lens is installed apart from the infinite chart. The macrochart unit moved in the housing has a light source(131) installed in the housing and a macrochart(132) apart from the light source. The image forming lens and the image forming lens module are fixed at the socket installed in the housing. The PCB is connected to a lower part of the socket. The image unit connected to the PCB displays signals received from the image forming lens and the image forming lens module.

Description

Image forming hens, and testing and controlling device for module of the image forming lens}

1 is a view showing a general image pickup lens and the image pickup lens module, Figure 1a is a view showing a general image pickup lens and the image pickup lens module is a CCD or CMOS Auto Focus and Zoom, Figure 1b is a CCD or CMOS Auto Focus and FIG. Is a view illustrating a general image pickup lens and an image pickup lens module that are not zoomed in.

2 is a diagram illustrating an inspection and adjustment device of an imaging lens and an imaging lens module according to the present invention.

3 is a view showing the principle of the inspection and adjustment of the imaging lens and the imaging lens module according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: imaging lens and imaging lens module 11: lens

12 filter 13 sensor

14: PCB 15: Connector

10 ': imaging lens and imaging lens module 11': PCB

12 ': Image sensor 13': Filter

14 ': holder 15': lens

100: inspection and adjustment device 110: housing

111: switch 120: infinite chart portion

121: upper light source 122: infinite chart

123: relay lens 130: macro chart

131: macro light source 132: macro chart

133: air cylinder 134: step motor

140: mounting portion 141: socket

142: PCB 143: Socket Base

144: base 145: goniometer and X, Y, Z Stage

150: burn part

The present invention relates to an inspection lens and an inspection and adjustment device for an imaging lens module, and more particularly, a general imaging lens, an imaging lens module and an auto focus, such as a CCD or CMOS auto focus, a zoom installed in a mobile communication terminal. The present invention relates to an inspection lens and an inspection and adjustment device for an imaging lens module which inspect and adjust both a general imaging lens and an imaging lens module that cannot be zoomed.

Recently, the spread of the mobile communication terminal with a camera function is actively made, and this type of mobile communication terminal (hereinafter referred to as "phone") has a small camera module is built.

This general imaging lens and the imaging lens module will be described with reference to the accompanying drawings.

FIG. 1A illustrates a general imaging lens and an imaging lens module that is a CCD or a CMOS auto focus and a zoom, and as shown, the imaging lens and the imaging lens module 10 are printed circuit boards (PCBs) 14. ), A CCD or CMOS image sensor (hereinafter referred to as " image sensor ") 13, lens 11, and infrared cut filter 12 occupy a major configuration.

The image sensor 13 converts light incident through the lens 11 into an electrical image signal through the PCB 14 and the image signal through an image signal processor (ISP). Converts to a certain format, and performs functions such as color correction.

The lens 11 forms an external image on the surface of the image sensor 13 such as a CCD or a CMOS to enable recording and transmission of still or moving images.

In addition, as the number of pixels of the image sensor 13 and the size of the pixels decrease, the lens 11 is required to have a higher optical resolution, and the lens 11 has a size small enough to be embedded in a phone (mobile communication terminal). Aspheric lenses are mainly used because they have to satisfy performance.

The silicon photo diode (SPD) used in the imaging lens and the image sensor 13 mounted on the imaging lens module 10 transmits light of a wide wavelength to the infrared region, causing the image to appear red. .

As a result, only 400-700 nm of visible light suitable for human visibility is transmitted, and light in the near-infrared region of 700 nm or more must be removed, and this phenomenon is solved by the infrared cut filter 12.

In other words, the infrared cut filter 12 serves to express the color of the image closer to the natural color.

Fabrication of the infrared cut filter 12 to remove the light in the infrared region consists of a thin film design technology having a high transmittance and a deposition manufacturing technology using a vacuum evaporator (vacuum evaporator).

1B is a view illustrating a general imaging lens and an imaging lens module without CCD or CMOS auto focus and zoom, and as shown, the imaging lens and the imaging lens module 10 'may include a printed circuit board (PCB) ( 11 '), CCD or CMOS image sensor (hereinafter referred to as " image sensor ") 12', lens 15 ', holder 14' and infrared cut-off filter 13 '. .

The image sensor 12 ′ converts light incident through the lens 15 ′ into an electrical image signal through the PCB 11 ′, and serves as an image signal processor (ISP). It converts the video signal into a certain format and performs functions such as color correction.

The lens 15 'forms an external image on the surface of the image sensor 12' such as a CCD or CMOS to enable recording and transmission of still or moving images.

In addition, the lens 15 'is required to have a higher optical resolution as the number of pixels and the size of the image sensor 12' are decreased, and the lens 15 'is small enough to be embedded in a phone (mobile communication terminal). Aspheric lenses are mainly used because they have to satisfy low performance.

The silicon photo diode (SPD) used in the imaging lens and the image sensor 12 'mounted on the imaging lens module 10' transmits light of a wide wavelength to the infrared region, thereby causing the image to appear red. cause.

As a result, only 400-700 nm of visible light, which is suitable for human visibility, is transmitted, and light in the near-infrared region of 700 nm or more should be removed.

In other words, the infrared cut filter 13 ′ serves to express the color of the image closer to the natural color.

Fabrication of the infrared cut filter 13 ′ that removes the light in the infrared region consists of a thin film design technique having a high transmittance and a deposition manufacturing technique using a vacuum evaporator.

On the other hand, the inspection of the conventional imaging lens and the imaging lens module 10, 10 'made as described above is determined by whether the focus of the imaging lens and the imaging lens module 10, 10' is well formed according to the distance. .

The focusing of the imaging lens and the imaging lens module 10 (10 ′) should form a clear image on the image sensor 13 (12 ′) from a certain short distance to a long distance (infinity).

To do this, an object, or a chart, is placed in the macro (50-100 mm) position, 500 mm, 2000 mm and infinity (5000 mm or more) of the imaging lens and the imaging lens module 10 (10 '). It should be positioned at a distance and it is determined whether the image or the focus is well matched with the image pickup lens and the image sensors 13 and 12 'of the image pickup lens module 10 and 10' for each distance.

However, in the conventional inspection method for inspecting such an imaging lens and the imaging lens module 10 (10 '), as described above, the chart is positioned for each distance and accordingly the imaging lens and the imaging lens module 10 (10') is applied. In order to determine the focus by distance, the chart should be positioned according to each focus distance, and the chart also needs to be larger in size and volume, so the imaging lens and the imaging lens should be larger. In order to inspect the modules 10 and 10 ', a large space was required.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, by configuring an inspection and adjustment device consisting of a macrochart portion and an infinite chart portion having a relay lens to inspect the imaging lens and the imaging lens module It is an object of the present invention to provide an imaging lens and an imaging lens module inspection and adjusting device capable of minimizing space and inspecting and adjusting the imaging lens and the imaging lens module regardless of the number of pixels of the imaging lens and the imaging lens module.

The imaging lens and imaging lens module inspection and adjustment device of the present invention for achieving the above object is an image sensor installed on a PCB, an infrared cut filter covering the image sensor, the imaging lens and the imaging lens module consisting of a lens An inspection and adjustment device according to claim 1, wherein the inspection and adjustment device comprises: an infinite chart portion including an upper light source installed in a housing, an infinite chart provided to be spaced apart from the upper light source, and a relay lens provided to be spaced apart from the infinite chart; A macrochart unit which is composed of a light source installed in the housing and a macrochart provided to be spaced apart from the light source, and moves in the housing; A socket installed in the housing to fix the imaging lens and the imaging lens module; A PCB installed to be connected to a lower portion of the socket; And an image unit connected to the PCB to visually display a signal received by the image pickup lens and the image pickup lens module.

Preferably, the macro chart unit is provided with an air cylinder for moving the macro chart to the light source side.

The housing is provided with a step motor for moving the macro chart portion to the imaging lens fixed to the socket and the imaging lens module.

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The inner surface of the housing is blackened to prevent reflection of light, and the light source is made of LED.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the present invention, the same reference numerals are given to the same parts as in the prior art, and overlapping descriptions will be omitted, but the imaging lens and the imaging lens module in the following are the imaging lens and the imaging lens module which are Auto Focus and Zoom. It will be described including an image pickup lens and an image pickup lens module that is not Auto Focus and Zoom.

Therefore, the present invention is a device for inspecting and adjusting the imaging lens and the imaging lens module, and since the configuration of the imaging lens and the imaging lens module is the same as in the related art, the repeated description thereof is omitted, and only the inspection and adjustment device for inspecting the same will be described. Shall be.

2 is a diagram illustrating an inspection and adjustment device for an imaging lens and an imaging lens module according to the present invention, and FIG. 3 is a view illustrating a principle of an inspection and adjustment device for an imaging lens and an imaging lens module according to the present invention. .

The inspection and adjustment device 100 of the imaging lens and imaging lens module 10 according to the present invention is configured in the housing 110, as shown in FIG.

The housing 110 has a size of approximately 650 × 410 × 765 mm (W × D × H), the inside of which is formed of an empty rectangular parallelepiped, and the inner surface thereof is painted in black to prevent reflection of light.

On the other hand, the inner upper portion of the housing 110 is formed an infinite chart portion 120.

The infinite chart part 120 has an upper light source 121 made of LEDs installed on an inner upper side of the housing 110, and three infinite charts 122 are provided in the lower housing 110 spaced apart from the upper light source 121. ) Is installed, and the relay lens 123 is installed in the lower housing 110 spaced apart from the infinite chart 122.

The three infinite charts 122 are set to different distances. That is, for example, 500 mm, 2000 mm, and set to infinity, the inspection lens and the lens 11 of the imaging lens module 10 to check whether the focus is exactly at each distance and to adjust the focus.

In addition, a macrochart 130 is formed on the lower housing 110 spaced apart from the infinite chart part 120, and the imaging lens and the imaging lens module 10 fixed to the socket 141 to be described later and 100 mm. It is set at spaced intervals. Then, the AF is activated to focus the lens 11 of the imaging lens and the imaging lens module 10 on the macrochart 132, and at this time, voltage and current characteristics applied to the imaging lens and the imaging lens module 10 are measured. Inspect

Although the macrochart 130 is not shown in a substantially box shape, a rack gear is formed on one surface thereof, and the stepper motor 134 having a pinion gear meshed with the rack gear is installed at the housing 110. The macrochart 130 is guided to the housing 110 to move left and right within the housing 110.

A macro light source 131 made of an LED is installed on the macro chart unit 130, and a macro chart 132 is installed below the macro chart unit 130 spaced apart from the macro light source 131.

In addition, the macrochart 132 is slidably moved left and right in the macrochart 130 through an air cylinder 133 connected to one side.

In addition, the mounting housing 140 to which the imaging lens and the imaging lens module 10 are fixed is installed in the lower housing 110 spaced apart from the macrochart 130.

An upper portion of the mounting portion 140 spaced apart from the macro chart unit 130 is provided with a socket 141 to which an imaging lens and the imaging lens module 10 are fixed, and a socket 141 and a lower portion of the socket 141. A PCB 142 to be connected is installed, and a socket base 143 is installed below the PCB 142.

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On the other hand, the light source 121, 131 made of an LED as described above has the advantage that the light of a uniform illuminance from the lamp.

In addition, although not shown in the housing 110, a controller for controlling the inspection and adjusting device as a whole, supplying power to the light sources 121 and 131, and adjusting the brightness of the light sources 121 and 131 is installed. In the housing 110, an imaging lens and various boards (not shown, PCBs) for processing signals received by the imaging lens module 10 are installed, and an image part including a computer (PC) visually displaying the signals thereof. 150 is installed.

Here, reference numeral 111 denotes a switch for semi-automatic inspection and adjusting device 100.

3, the principle of the imaging lens and the inspection and adjustment device for the imaging lens module according to the present invention will be described.

As shown in FIG. 3, when the chart is positioned inside the focal point f of the relay lens 123, the virtual image is not formed but the virtual image chart is formed. The virtual image chart thus formed forms an image on the image pickup lens and the image sensor 13 of the image pickup lens module 10. If this is expressed by a formula, it is as following Formula 1.

1 / a + 1 / b = 1 / f ----- (1)

a: Chart distance (object distance)

b: Virtual chart distance (upper distance)

f: focal length of relay lens

Here, a is the distance from the relay lens to the chart, and b is the distance of the actual chart if there is no relay lens. As a result, the actual chart distance b can be seen by the following equation (2).

b = af / a-f ----- (2)

That is, the distance of the actual chart can be known by adjusting the distance between the chart and the relay lens 123.

Using this principle, the same phenomenon as that of the actual chart distance from 500 mm to infinity can be realized.

Here, in order to inspect only the characteristics of the imaging lens and the imaging lens module 10, the relay lens 123 should transmit the image of the chart to the imaging lens and the lens 11 of the imaging lens module 10 without any influence. To this end, various aberrations of the relay lens 123 must be perfectly corrected.

Hereinafter, the operation of the imaging lens and the inspection and adjustment device for the imaging lens module according to the present invention.

First, the AF and zoom imaging lens and the imaging lens module 10 to be inspected are seated in the socket 141 of the mounting unit 140, and the program of the CCD or CMOS auto focus and zoom imaging lens and imaging lens module inspection and adjustment device Run

When the program is executed as described above, the step motor 134 by the controller (not shown) is operated to move and stop the macro chart unit 130 to be positioned toward the imaging lens and the imaging lens module 10.

Then, the macro chart 132 is moved to be positioned below the macro light source 131 by the air cylinder 133 in the macro chart unit 130 and stopped.

In this state, the voltage, current characteristic inspection, focus inspection, color and gray inspection of the imaging lens and the imaging lens module 10, and distortion of the lens 11 of the imaging lens and the imaging lens module 10 can be inspected. do.

After this inspection, only the macro chart 132 is moved and separated from the macro chart unit 130 by the air cylinder 133, and only the macro light source 131 remains.

In this state, White Frame, Ambient Light Ratio, S / N Ratio, Dark (inspect the foreign material or defect pixel appearing on the image sensor 13 in the dark state of the light source), Dim (the brightness of the light source is slightly Foreign objects or defect pixels appearing in the image sensor in the bright state), saturation (inspect the foreign objects or defect pixels appearing in the image sensor when the brightness of the light source is saturated) and foreign objects or defect pixels appearing in the image sensor 13 visually Check it.

After the inspection, the macro chart unit 130 is moved to its original state due to the reverse operation of the step motor 134 and separated from the imaging lens and the imaging lens module 10.

In this state, the AF and ZOOM lenses 11 operate on the infinite chart 122 adjusted according to the distance of 500 mm, 2000 mm, and infinity on the infinite chart part 120 to determine whether the focus is accurately at each distance. Inspect and adjust the focus. After all these processes, the evaluation of the imaging lens and the imaging lens module 10 is completed.

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Therefore, regardless of the number of pixels of the imaging lens and the imaging lens module 10 by the macro chart unit 130 and the infinite chart unit 120, the imaging lens and the imaging lens are made using the inspection and adjustment device 100 of the present invention. The module 10 can be inspected simply, and the inspection space can be minimized to the space of the inspection and adjusting device 100 of the present invention.

As described above, according to the imaging lens and the imaging lens module inspection and adjustment device of the present invention, the imaging lens and the imaging lens module can be formed regardless of the number of pixels of the imaging lens and the imaging lens module by the infinite chart portion having the macrochart portion and the relay lens. The imaging lens module can be easily inspected and adjusted, and the inspection space can be minimized to the space of the inspection and adjustment device.

Claims (6)

An image sensor provided on a PCB, an infrared cut filter covering the image sensor, and the inspection and adjustment device of the imaging lens and imaging lens module consisting of a lens, The inspection and adjustment device includes: an infinite chart portion including an upper light source installed in a housing, an infinite chart spaced apart from the upper light source, and a relay lens spaced apart from the infinite chart; A macrochart unit which is composed of a light source installed in the housing and a macrochart provided to be spaced apart from the light source, and moves in the housing; A socket installed in the housing to fix the imaging lens and the imaging lens module; A PCB installed to be connected to a lower portion of the socket; And an image unit connected to the PCB to visually display a signal received by the image pickup lens and the image pickup lens module. The method of claim 1, And an air cylinder for moving the macro chart to the light source side, wherein the macro chart unit is provided with an air cylinder. The method according to claim 1 or 2, And a step motor for moving the macro chart unit toward the imaging lens module and the imaging lens module side, wherein the macro chart unit is fixed to the socket. delete The method of claim 1, And an inner surface of the housing is blackened to prevent reflection of light. The method of claim 1, The light source is an LED inspection and adjustment device for an imaging lens module, characterized in that made of.

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