CN2578847Y - Scanner autofocus optomechanical device - Google Patents

Abstract

An automatic focusing optical-mechanical device for scanner is composed of an optical-mechanical main body, a power motor with screw thread on its shaft, a pivoting seat with a drive axle, a focusing regulator at both ends of said drive axle, and a drive gear engaged with said screw thread on said drive axle. When scanning, the focusing regulator is driven by the power motor to find out the scanning focus with optimal resolution, and when the power motor stops rotating, the angle corresponding to the regulator is fixed, i.e. the scanning focus is fixed, so as to obtain the optimal scanning imaging effect.

Description

Scanner autofocus optomechanical device

technical field

The utility model relates to an optical-mechanical device of a scanning machine, in particular to an auto-focusing optical-mechanical device of a scanning machine which can automatically adjust the depth of the scanning focal length when the scanning machine scans a transparent sheet, so as to make the imaging image clearer.

Background technique

Generally, the thickness of the negative film is about 0.1-0.2mm, and the thickness of the edge of the slide is about 1.2-3.0mm. There is a considerable difference in the thickness of the two transparent films. In order to make the depth of field of the scanner cover the slide The error of the edge can also cover the difference in the thickness of the general negative film. It is to use different clamps to clamp the slide or negative film, or use different thickness of the pressure plate to match the thickness of the transparent film, so that the transparent film is placed in the optical mechanical device. within the range of depth of field to complete the scanning work, although the above method can place transparent sheets of different thicknesses within the range of depth of field of the optomechanical device, but the thickness of each transparent sheet is slightly different, so the thickness of each transparent sheet The focal length must also be different, but the above method can only place each transparent sheet within the depth of field, but cannot adjust the focal length of each transparent sheet, or the transparent sheet has been deformed due to moisture or long-term use. Deformed transparent film, such as the bulge in the middle part, if the conventional device is used because the focal length cannot be adjusted for the deformed part in the middle, even if the deformed transparent film is within the depth of field of the optomechanical device, the resolution of scanning imaging will still be reduced, and even the image will be blurred .

There is a scanning device that can automatically adjust the focus of the transparent film. The scanning device is designed to clamp and fix the transparent film in a form that can move up and down or horizontally, and then use software or adjustment buttons on the body to adjust. The focal length of the transparent sheet, however, this type of component is complicated, difficult to assemble, and the mechanical position is not easy to determine, and the overall manufacturing cost is relatively high.

Therefore, how to address the above problems, design a scanning machine automatic focusing optical mechanical device, not only can adjust the focal length according to the thickness of the transparent sheet or the deformation of the transparent sheet, improve the resolution of scanning imaging, but also reduce the overall production cost, long-term It has always been the user's ardent expectation, and it is also my greatest wish. Based on my many years of practical experience in research, development, and sales of related products, I have thought about and improved ideas. After many researches, designs, and special discussions, I finally developed An autofocus optical-mechanical device for a scanning machine can solve the above-mentioned problems.

Utility model content

The main purpose of the present utility model is to provide an automatic focusing optical mechanism of a scanning machine, which can automatically adjust the focal length according to the thickness of the transparent sheet, and improve the resolution of imaging.

The secondary purpose of the present utility model is to provide an auto-focus optical-mechanical device for a scanning machine, which has an auto-focus optical-mechanical device, which can reduce the overall production cost of the auto-focus device.

In order to achieve the above purpose, a scanning machine autofocus optical mechanical device of the present invention includes an optical machine main body, which is characterized in that: the optical machine main body includes: a reflector installed at the inner front end of the optical machine main body ; An image pickup device installed at the inner rear end of the optical machine main body; a lens installed between the reflector and the image pickup device; a power motor installed above the front end of the optical machine main body; On the side, the shaft extension of the power motor is provided with threads; a pivot seat is installed under the front end of the optical machine main body; and a transmission shaft is installed on the pivot seat, and a focus adjustment is provided at both ends of the transmission shaft The device is provided with a transmission tooth engaged with the shaft extension screw thread of the power motor on the side of the focus adjustment device on the power motor side. in;

The image capture device is a charge-coupled device.

The focus adjustment device is an eccentric circle.

The focus adjustment device is a cam.

A cover is installed below the main body of the optical machine, and the cover is provided with a perforation at the relative position of the reflector, and a buckle is respectively provided at an appropriate position on both sides of the cover, and the edges on both sides of the main body of the optical machine are opposite to each other. A buckle plate is respectively arranged at the buckle.

A mobile platform is installed above the main body of the optical machine, and at least one slide rail hole is installed above the mobile platform.

A slide rail is inserted into the slide rail hole.

At least one elastic element and a connecting device are installed at an appropriate position between the lower part of the moving platform and the upper part of the main body of the optical machine. The elastic element is separated from the connecting device by an appropriate distance. Leverage.

The elastic element is a spring.

At least one clamping device is installed at an appropriate position below the moving platform so that the moving platform is installed above the main body of the optical machine.

The automatic focusing optical mechanism of this scanner is suitable for transparent sheets of any thickness, especially for transparent sheets that have been deformed due to moisture or long-term use. When scanning, you only need to fix the angle of the focus adjustment device corresponding to the highest NTF value. The best scanning imaging can be obtained, the structure is simple, the positioning is easy, and the overall production cost can be reduced, and it can be used with any form of mobile platform.

Description of drawings

Fig. 1 is a three-dimensional exploded schematic diagram of a preferred embodiment of the present invention.

Fig. 2 is a three-dimensional schematic diagram of a combination of a preferred embodiment of the present invention.

Fig. 3 is a schematic front view of a preferred embodiment of the present invention.

Detailed ways

In order to have a further understanding and understanding of the purpose, technical features and effects of the present utility model, a preferred embodiment is given hereby, and the detailed description is as follows in conjunction with the accompanying drawings:

Referring to Fig. 1, 2, a kind of scanning machine autofocus optomechanical device, its optomechanical device 10 comprises an optomechanical main body 11; One side cover body 12 is installed on the side of this optical mechanical main body 11; A mirror 14, Installed on the front end of the optical machine main body 11; an image pickup device, i.e. a charge-coupled device 18, installed on the inner rear end of the optical machine main body 11, that is, on the side cover 12; a lens 16, installed Between the reflector 14 and the charge-coupled device 18; a power motor 20 is installed on the side above the front end of the optical machine body 11, and the shaft extension of the power motor 20 is provided with threads; a pivot seat 22, Installed below the front end of the optical machine main body 11; a transmission shaft 24 is installed on the pivot seat 22, and a focus adjustment device 26 is respectively provided at both ends of the transmission shaft 24, and the A focus adjustment device 26 is an eccentric circle , it can also be replaced by a cam, and one side of the focus adjustment device 26 on the transmission motor 20 side is provided with a transmission tooth 28 that engages with the shaft extension screw thread of the power motor 20; a cover 30 is installed on the optical machine Below the main body 11, the cover body 30 is provided with a perforation 32 relative to the position of the reflector 14, for the light of the scanning light source to pass through, and a buckle 34 is respectively provided on both sides of the cover body 30, and the two sides of the optical machine main body 11 A buckle plate 36 is respectively provided on the side edge opposite to the buckle 34 .

A mobile platform 40 is provided with a hollow upper fixing seat 42 on both sides of its front end, and a hollow lower fixing seat 44 is respectively provided on both sides of the optical machine main body 11 relative to the position of the upper fixing seat 42, and the two upper fixing seats A clamping device 46 is respectively installed beside the seat 42, and a connecting device 50 is installed below the rear end of the mobile platform 40. By the clamping device 46 and the connecting device 50, the mobile platform 40 is installed on the optical machine. On the top of the main body 11, an elastic element 52 is respectively installed between the upper fixing seat 42 and the lower fixing seat 44 on both sides, and at least one slide rail hole 54 is provided above the mobile platform 40; a slide rail 56 passes through The slide rail hole 54 enables the mobile platform 40 and the optomechanical device 10 to move horizontally; a clamping device 60 is used to clamp a transparent sheet 66 to be scanned, and the center of the clamping device 60 is provided with a rectangular perforation 62 A sliding aid 64 is provided on both sides above the clamping device 60, and the clamping device 60 is installed on the optical machine main body 11 of the scanning device.

Referring to FIG. 3 , when the optomechanical device 10 scans the transparent sheet 66 held by the clamping device 60 , the optomechanical device 10 slides to the clamping device by the cooperation of the moving platform 40 and the slide rail 56 60, make the focus adjustment device 26 on the optomechanical device 10 keep in contact with the slide aid 64 on the clamping device 60, and slide because the focus adjustment device 26 is made of a material with a low coefficient of friction. 64 moves by sliding instead of rolling. When the optomechanical device 10 slides on the clamping device 60, the connecting device 50 is used as a fulcrum, and the elastic element 52 is used to form a leverage, so that the optomechanical The front end of the device 10 can be adjusted up and down along with the inclination of the clamping device 60, like a seesaw, so that the focus adjustment device 26 can keep in contact with the sliding aid 64 and slide, that is, keep the mirror 14 and the transparent mirror 14 during scanning. The depth of the scanning focal length of sheet 66, the elastic element 52 is a compression spring, and it can also use a plurality of elastic sheets installed between the optical machine main body 11 and the mobile platform 40 to achieve the same effect.

When scanning, a light source is used to irradiate the transparent sheet 66, and the light passes through the transparent sheet 66 to the reflector 14, and the reflector 14 reflects the light to the lens 16, and the lens 16 projects the light into the charge-coupled device 18 For imaging, the focal length is determined by the rotation angle of the focus adjustment device 26. When the focus adjustment device 26 is fixed at a certain angle, the focal length is fixed. When scanning the photomechanical device 10, the power motor 20 is activated by the focusing software. , so that the focus adjustment device 26 can be rotated 360 degrees at any position of the clamping device 60 above the transparent sheet, so as to obtain the MTF value of any angle at which the focus adjustment device 26 rotates, and find the highest NTF value by software , and fix the corresponding angle, which is the optimal focal length value, so when scanning the transparent sheet 66, the optimal resolution can be obtained by using this angle as the scanning focal length.

The automatic focusing optical mechanism of the scanning machine is suitable for transparent sheets 66 of any thickness, especially the transparent sheets 66 that have been deformed due to moisture or long-term use, because the deformed transparent sheets 66 are not a complete plane, such as the middle part The general transparent sheet 66 is like a photo, and the focal point of the photo is located in the middle. If you use a known scanning device, you will not be able to adjust the focus on a certain part, so that the scanned imaging effect will be greatly reduced. If you use this scanning device For the automatic focusing optomechanical device, it is only necessary to move the optomechanical device 10 to the deformation position of the transparent sheet 66, use the above method to find the highest MTF value, and only need to fix the focus adjustment device 26 corresponding to the highest value during scanning. The angle of the NTF value, that is, the best scanning focal length can be fixed to obtain the best scanning imaging. The mechanism design of the automatic focusing optical mechanism of this scanner is simpler than that of the conventional mechanism, and the positioning is easy, and the overall production cost can be reduced; The optomechanical device 10 of the automatic focusing optomechanical device of the scanning machine can be used with any type of mobile platform.

Claims (10)

1. scanning machine optical mechanical apparatus of focusing automatically comprises a ray machine main body, and it is characterized in that: this ray machine main body includes:

One catoptron is installed in the interior forward end of this ray machine main body;

One Image intake device is installed in the rear end, inside of this ray machine main body;

One camera lens is installed between this catoptron and this Image intake device;

One power motor is installed in front end top one side of this ray machine main body, and the shaft extension of this power motor is provided with screw thread;

One pin joint seat is installed in this ray machine body front end below; And

One transmission shaft is installed in this pin joint seat, and these transmission shaft two ends are respectively equipped with a focusing adjusting gear, is provided with and this power motor shaft extension screw thread driving cog of interlock mutually in this focusing adjusting gear one side of this power motor side.

2. the scanning machine according to claim 1 optical mechanical apparatus of focusing automatically, it is characterized in that: described Image intake device is to be charge coupled cell.

3. the scanning machine according to claim 1 optical mechanical apparatus of focusing automatically, it is characterized in that: described focusing adjusting gear is an off-centre operation.

4. the scanning machine according to claim 1 optical mechanical apparatus of focusing automatically, it is characterized in that: described focusing adjusting gear is a cam.

5. the scanning machine according to claim 1 optical mechanical apparatus of focusing automatically, it is characterized in that: described ray machine main body below is equiped with a lid, this lid is provided with a perforation in the relative position of this catoptron, the appropriate location of these lid both sides respectively is provided with a clasp, and these ray machine main body both sides of the edge then respectively are provided with a buckle with respect to this clasp place.

6. the scanning machine according to claim 1 optical mechanical apparatus of focusing automatically is characterized in that: described ray machine main body top is equiped with a mobile platform, and this mobile platform top is equiped with at least one slide rail hole.

7. the scanning machine according to claim 6 optical mechanical apparatus of focusing automatically is characterized in that: intert a slide rail in the described slide rail hole.

8. the scanning machine according to claim 6 optical mechanical apparatus of focusing automatically, it is characterized in that: the appropriate location between described mobile platform below and this ray machine main body top is equiped with an at least one flexible member and a coupling arrangement, this flexible member and this coupling arrangement be one section suitable distance at interval, and this coupling arrangement and this flexible member form a leverage.

9. the scanning machine according to claim 8 optical mechanical apparatus of focusing automatically, it is characterized in that: described flexible member is a spring.

10. the scanning machine according to claim 6 optical mechanical apparatus of focusing automatically is characterized in that: the appropriate location of described mobile platform below is equiped with at least one makes this mobile platform be installed in the holder of this ray machine main body top.

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