CN2475088Y - Scanning unit with automatic document feeder - Google Patents

Abstract

A scanner able to be installed with automatic paper feeder is composed of at least one light source, several reflecting mirrors with a switchable reflector between two positions, a first position for scanning original in platform mode and a second position for scanning original in paper-feeding mode, and an image pick-up unit regulator for moving the light source in proper position to regulate total optical path length.

Description

Scanning unit with automatic document feeder

The utility model relates to a scanning device, in particular to a scanning device which can be equipped with an automatic paper feeder, which can perform flat-bed scanning or paper-feeding scanning of the automatic paper feeder through switching an optical path.

The principle of the scanner is mainly to use an optical device to bend the beam through the lens for imaging, and use a charge-coupled device (CCD converter) to convert the imaged optical signal into a digital signal that can be processed by a computer. The optical path has at least a certain length. If the optical path is a straight line, the volume of the optical path device may become large, but the excessive volume is contrary to the current trend of electronic products towards light, thin, short, and small. Therefore, the optical path device of the current scanner generally uses several reflectors to reflect the light entering the interior of the optical path device several times under the principle of constant optical path length, so that the volume of the scanner can be effectively reduced. Therefore, in the optical path device, the number and size of the mirrors and their corresponding and arranged positions will directly determine the volume and weight of the optical path device, and indirectly affect the overall weight and volume of the scanner.

In existing scanners, single-sheet scanning is generally performed. When multiple sheets of scanning are required, the operation is cumbersome and time-consuming. Therefore, an automatic document feeder can be added to the existing scanner to provide paper feeding. Scanning can save the waiting time of personnel and improve scanning efficiency.

Please refer to FIG. 1A , which is a schematic diagram of an optical device of a conventional flatbed scanner. A first scanning area 11 is defined on the flatbed scanning device 10 for scanning an original document 40 in a flatbed manner. 40 for flatbed scanning.

A first bearing seat 60 is provided with a first reflector (M1) on it, a second bearing seat 70 is provided with a second reflector (M2) and a third reflector (M3) on it, and the light source 30 is combined on the first bearing seat 60 and moves with it, the first reflector (M1), the second reflector (M2) and the third reflector (M3) can receive the light from the original 20 and convert it reflection. When scanning in a platform manner, the first bearing base 60 and the second bearing base 70 are driven by a driving device 50 to move linearly between the first scanning area 11 at a speed of 2:1.

An image pickup unit 80 corresponds to the second bearing seat 70, and receives reflected light and converts it into an electrical signal. Wherein the image pickup unit 80 includes: a lens 81, which can receive the light reflected by it and gather it at its focal point; The light is converted into a digital signal that can be processed by a computer.

When scanning in a flatbed manner, the light travels from the light source 30 through the originals 40 , M1 , M2 , M3 to the image pickup unit 80 .

Please refer to FIG. 1B , which is a schematic diagram of a conventional scanning device that can be equipped with an automatic document feeder. Wherein, a second scanning area 21 is defined on the platform scanning device 10, which is used to cooperate with the automatic document feeder 20 to scan the original 40a in a paper-feed mode. The scanning device that can be equipped with the automatic document feeder uses a light source 30 The light is provided to the document 40a located in the second scanning area 21 for paper-fed scanning, and the first bearing seat 60 and the second bearing base 70 are fixedly positioned in the second scanning area 21 .

When scanning in the paper-fed mode, the light travels from the light source 30 to the image pickup unit 80 through the originals 40 a , M1 , M2 , and M3 .

From this we can know that the existing scanning device that can be equipped with an automatic document feeder needs to provide an accommodating space for horizontal displacement from the first scanning area 11 to the second scanning area 21, that is, when using the automatic document feeder 20 to scan , its length will at least increase the "L" distance (as shown in Figure 1B), therefore, not only its volume and weight are larger, but also the cost is higher, so the volume, weight and cost of the existing scanner , cannot be effectively reduced.

The main purpose of the utility model is to provide a scanning device which can effectively reduce the volume, weight and cost of the scanner and can be equipped with an automatic document feeder.

In order to achieve the above object, the utility model takes the following technical measures:

In the scanning device of the utility model, which can be equipped with an automatic document feeder, the scanning device is defined with a first scanning area for scanning a manuscript in a platform manner and a space for scanning the manuscript in a paper-feed manner in cooperation with an automatic document feeder. The second scanning area; scanning devices that can be equipped with automatic document feeders include:

at least one light source providing light to the original for scanning;

A first bearing seat, which is provided with a first reflective lens, the first reflective lens can receive the light from the original document and reflect it;

A second bearing seat, which is at an appropriate distance from the first bearing seat, and the second bearing seat is provided with:

at least one switchable mirror switchable between a first position and a second position;

A number of reflective mirrors, which are arranged at appropriate positions on the second bearing seat;

An image pickup unit, which corresponds to the second bearing seat, accepts the reflected light and converts it into an electrical signal;

An image pickup unit adjustment device, which is connected with the image pickup unit, for proper displacement movement of the image pickup unit;

When the switchable reflector is at the first position, the mutual position and angle correspondence between the first reflector of the first carrier and the plurality of reflectors of the second carrier is just such that the light from the light source is reflected and then directed to the image pickup. unit, and scan in a flat-bed manner;

When the switchable reflector is in the second position, the corresponding relationship between the positions and angles of the reflectors on the second bearing seat can make the light from the light source reflect and then shoot to the image pickup unit, so that the paper can be fed by the automatic paper feeder scan in the same way.

Wherein, when scanning in a platform manner, the first bearing base and the second bearing base move linearly in the first scanning area at a speed of 2:1.

Wherein, when the automatic document feeder scans in a paper-feed mode, the first bearing seat and the second bearing seat are positioned in the second scanning area.

Wherein, the light source is arranged between the first bearing seat and the second bearing seat.

Wherein, a first reflective mirror (M1) is provided on the first carrying seat, a second reflective mirror (M2) is provided on the second carrying seat, and the second reflective mirror is the switchable reflective mirror and a third reflective mirror. Reflector (M3); the light provided by the light source is directed towards the travel route of the original in the first scanning area, from the light source → the original in the first scanning area → M1 → M2 first position → M3 → image pickup unit; The light provided by the light source is directed toward the traveling path of the original in the second scanning area, from the light source → the original in the second scanning area → the second position of M2 → M3 → the image pickup unit.

Wherein, the first carrying seat is provided with a first reflecting mirror (M1), and the second carrying seat is provided with a second reflecting mirror (M2) and a third reflecting mirror (M3) as the switchable reflecting mirror and a The fourth reflector (M4); the light provided by the light source is directed towards the travel route of the original in the first scanning area, from the first light source → the original in the first scanning area → M1 → M2 → M3 first position → The image pickup unit, and the light provided by the second light source is directed towards the traveling path of the original in the second scanning area, from the light source → original in the second scanning area → M4 → M3 second position → image pickup unit.

Wherein, the switchable reflector is a rotatable reflector, which can be switched to the first position and the second position in a rotational manner.

Wherein, the switchable reflector is a semi-transparent reflector, when the light is incident from the front of the reflector, the light is reflected, and when the light is incident from the back, the light can pass through.

Wherein, the adjustment device of the image pickup unit performs a horizontal displacement movement to adjust the change amount of the total optical path length.

Wherein, the image pickup unit adjusting device performs automatic focus adjustment to adjust the change amount of the total optical path length.

Compared with the prior art, the utility model has the following effects:

The main features of the utility model are: the scanning device of the utility model, which can be equipped with an automatic document feeder, can be on the position of the original platform scanning, and only use the position of the reflective mirror and the image pickup unit adjustment device to make an automatic focus adjustment to adjust The switching of the change amount of the total optical path length can achieve the transformation of the optical path path, making it suitable for the purpose of scanning paper fed by the automatic document feeder of the device, which can effectively reduce the volume, weight and cost of the existing scanner.

In conjunction with accompanying drawing and embodiment, structural feature of the present utility model is described in detail as follows:

A brief description of the accompanying drawings:

Figure 1A: Schematic of the optical setup of an existing flatbed scanner.

FIG. 1B : A schematic diagram of an existing scanning device that can be equipped with an automatic document feeder.

Figure 2: A schematic diagram of an embodiment of a scanning device that can be equipped with an automatic document feeder of the present invention.

Figure 3: A schematic diagram of the second embodiment of the scanning device that can be equipped with an automatic document feeder of the present invention.

Fig. 4: A schematic diagram of the third embodiment of the scanning device that can be equipped with an automatic document feeder of the present invention.

Fig. 5: A schematic diagram of a fourth embodiment of a scanning device that can be equipped with an automatic document feeder of the present invention.

As shown in FIG. 2 and FIG. 3 , they are schematic diagrams of the first and second embodiments of the scanning device that can be equipped with an automatic document feeder of the present invention. In the scanning device of the present utility model, a first scanning area 11 is defined on the platform scanning device 10, which is used to scan an original 40 and a second scanning area 21 in a platform mode, and it cooperates with the automatic document feeder 20 to feed To scan the original document 40a in paper mode, the scanning device includes: at least one light source 30 , a first bearing seat 60 , a second bearing base 70 , an image pickup unit 80 and an image pickup unit adjusting device 90 .

When the light source 30 is properly switched, it can provide light to the original document located in the first scanning area 11 for flatbed scanning, or switch to provide light to the original document 40a located in the second scanning area 21 for paper-fed scanning. (as shown in picture 2). Of course, there is one light source 30 in the present utility model, and of course there can be two or more. The light is irradiated to the original 40 located in the first scanning area 11 for flatbed scanning, and the second light source 32 can provide light to be irradiated to the original 40 a located in the second scanning area 21 for sheet-fed scanning.

The first bearing seat 60 is provided with a first reflector ( M1 ), which can receive light from the document 40 and reflect it.

The second bearing base 70 is at an appropriate distance from the first bearing base 60, and the second bearing base 70 is provided with: at least one switchable reflector, in this embodiment, the switchable reflector is the second reflector (M2), It is switchable between a first position 71 and a second position 71a. The switchable reflector is a rotatable reflector, which can be switched to the first position 71 and the second position 71a in a rotating manner, or is a semi-transparent reflector, and the semi-transparent reflector, when When the light is incident from the front, the light is reflected, and when the light is incident from the back, the light can pass through, and some reflective mirrors are arranged at appropriate positions on the second bearing seat 70; in this embodiment, some reflective mirrors are the third reflector ( M3).

In this embodiment, when using one light source 30 (as shown in Figure 2), the light source 30 is arranged at an appropriate position between the first bearing seat 60 and the second bearing seat 70, and when it is a double light source (as shown in Figure 3), the second A light source 31 is combined with the first supporting base 60 and is linked with it. The second light source 32 can be arranged at a suitable position in the second supporting base 70 , the automatic document feeder 20 or the casing of the scanning device.

When scanning in a flatbed manner, the first carrier 60 and the second carrier 70 move linearly in the first scanning area 11 at a speed of 2:1, so that the light emitted by the original 20 can be accepted and reflected. . When the automatic document feeder 20 is used to scan the paper, the first bearing seat 60 and the second bearing seat 70 are fixed in position.

The image pickup unit 80 corresponds to the second bearing seat 70, and can accept the reflected light and convert it into an electrical signal, wherein the image pickup unit 80 includes: a lens 81, which can receive the light reflected and transmitted by it, and Focused at its focal point, and a charge-coupled element 82 is located at the focal point of the lens 81, and can receive the light collected by the lens 81 and convert it into a digital signal that can be processed by a computer.

The image pickup unit adjusting device 90 is connected with the image pickup unit 80 to provide the image pickup unit 80 with proper displacement movement.

When scanning in a flatbed manner, the second reflector (M2) is located at the first position 71, and the light source 30 provides light, which is directed to the traveling route of the original document 40 located in the first scanning area 11, and then the light source 30 → the first scanning area 11 original document 40 → M1 → M2 first position 71 → M3 → image pickup unit 80 . Wherein, the optical path length of the original 40 to M1 in the first scanning area 11 is T ₁ , the optical path length of the first position 71 from M1 to M2 is T ₂ , and the optical path length of the first position 71 of M2 to M3 is T ₃ , The optical path length from M3 to the image pickup unit 80 is T ₄ ; the total optical path length TT ₁ is T ₁ +T ₂ +T ₃ +T ₄ .

When the automatic document feeder 20 scans in a paper-feed mode, the second reflector (M2) is located at the second position 71a, and the light provided by the light source 30 is directed at the traveling path of the original document 40a located in the second scanning area 21, which is determined by Light source 30 → original document 40 a in the second scanning area 21 → M2 second position 71 a → M3 → image pickup unit 80 . Wherein, the optical path length from the original document 40a in the second scanning area 21 to the M2 second position 71a is _T5 , the optical path length from the M2 second position 71a to M3 is _T6 , and the optical path length from M3 to the image pickup unit 80 is T ₄ ; the total optical path length TT ₂ is T ₅ +T ₆ +T ₄ .

The total optical path length has a variable amount, which can be overcome by tolerance (applicable to lower-end products) or digital zoom technology. However, if the application of higher-end products or higher scanning quality requirements, an optical zoom lens can be used or the image pickup unit 80 can be provided with an appropriate horizontal displacement movement for the image pickup unit adjustment device 90 to adjust the total light. For the change of the path length, the horizontal position moves a distance equal to the change distance TT ₁ -TT ₂ of the two total optical path lengths, which is the length of T ₂ .

Please refer to Figure 4 and Figure 5, which are schematic diagrams of the third and fourth embodiments of the present invention, wherein the difference between this embodiment and the first and second embodiments is the change of the reflector group, and this structure is the same as The same parts of the first and second embodiments will not be described in detail.

The first bearing seat 60 is provided with a first reflector ( M1 ), which can receive light from the document 40 and reflect it.

The second bearing seat 70 is separated from the first bearing base 60 by an appropriate distance, and the second bearing base 70 is provided with: at least one switchable reflector. In this embodiment, the switchable reflector is a third reflector (M3). It can be switched between a first position 72 and a second position 72a. The switchable reflector is a rotatable reflector, which can be switched to the first position 72 and the second position 72a in a rotating manner, or is a semi-transparent reflector, which is arranged at an appropriate position of the second bearing seat 70 , In this embodiment, the plurality of reflecting mirrors are the second reflecting mirror (M2) and the fourth reflecting mirror (M4).

When scanning in a platform manner, the third reflector (M3) is located at the first position 72, and the light provided by the light source 30 is directed towards the traveling route of the original document 40 located in the first scanning area 11, and then the light source 30 → the first scanning area Original 40→M1→M2→M3 first position 72→image pickup unit 80 in 11; wherein, the optical path length from original 40 to M1 in the first scanning area 11 is _T11 , and the optical path length from M1 to M2 is _T22 , the optical path length from M2 to the first position 72 of M3 is T ₃₃ , the optical path length from the first position 72 of M3 to the image pickup unit 80 is T ₄₄ ; the total optical path length TT ₃ is T ₁₁ +T ₂₂ +T ₃₃ +T ₄₄ .

When the automatic document feeder scans in a paper-feed mode, the third reflector (M3) mirror is located at the second position 72a, and the light provided by the light source 30 is directed at the traveling path of the original 40a located in the second scanning area 21, which is From the light source 30 → the document 40 a of the second scanning area 21 → M4 → M3 second position 72 a → the image pickup unit 80 . Wherein, the optical path length of the originals 40a to M4 in the second scanning area 21 is _T55 , the optical path length from M4 to the second position 72a of M3 is _T66 , and the optical path length from the second position 72a of M3 to the image pickup unit 80 is T ₇₇ ; the total optical path length TT ₄ is T ₅₅ +T ₆₆ +T ₇₇ .

Since the change of the total optical path length is not very large, the image pickup unit 80 makes an automatic focus adjustment to adjust the change of the total optical path length by using the optical zoom lens, and the focus adjustment change is a change of TT ₃ -TT ₄ .

It can be seen that in the above-mentioned embodiments, the change of the optical path and the switching of the light source 30 are used without pushing the second bearing seat 701L to a far distance, so the volume, weight and cost of the scanner can be effectively reduced. Adapt to the development trend of light, thin, short and small in various electronic products nowadays.

The above content is to use the embodiment to illustrate the technical characteristics of the utility model, not to limit the scope of protection of the utility model, even if someone makes a slight change on the basis of the concept of the utility model, it should still belong to the scope of protection of the utility model.

Claims (10)

1. A scanning device that can be equipped with an automatic document feeder. The scanning device is defined with a first scanning area for scanning an original in a flat-bed manner and a space for scanning the original in a paper-feed manner in cooperation with an automatic document feeder. The second scanning area; scanning devices that can be equipped with automatic document feeders include: at least one light source providing light to the original for scanning; A first bearing seat, which is provided with a first reflective lens, the first reflective lens can receive the light from the original document and reflect it; A second bearing seat, which is at an appropriate distance from the first bearing seat, and the second bearing seat is provided with: at least one switchable mirror switchable between a first position and a second position; A number of reflective mirrors, which are arranged at appropriate positions on the second bearing seat; An image pickup unit, which corresponds to the second bearing seat, accepts the reflected light and converts it into an electrical signal; An image pickup unit adjustment device, which is connected with the image pickup unit, for proper displacement movement of the image pickup unit; When the switchable reflector is at the first position, the mutual position and angle correspondence between the first reflector of the first carrier and the plurality of reflectors of the second carrier is just such that the light from the light source is reflected and then directed to the image pickup. unit, and scan in a flat-bed manner; When the switchable reflector is in the second position, the corresponding relationship between the positions and angles of the reflectors on the second bearing seat can make the light from the light source reflect and then shoot to the image pickup unit, so that the paper can be fed by the automatic paper feeder scan in the same way. 2. The scanning device according to claim 1, wherein when scanning in a platform manner, the first bearing base and the second bearing base move linearly at a speed of 2:1 during the first scanning area. 3. The scanning device according to claim 1, wherein when the automatic document feeder scans in a paper-feed mode, the first bearing base and the second bearing base are positioned in the second scanning area . 4. The scanning device according to claim 1, wherein the light source is arranged between the first bearing seat and the second bearing seat. 5. The scanning device according to claim 1, characterized in that a first reflective mirror (M1) is provided on the first bearing seat, a second reflective mirror (M2) is provided on the second bearing seat, and the second reflective mirror (M2) is provided on the second bearing seat. The two reflectors are the switchable reflector and a third reflector (M3); the light provided by the light source is directed towards the travel route of the original in the first scanning area, from the light source to the original in the first scan area →M1→M2 first position→M3→image pickup unit; the light provided by the light source is directed to the travel route of the original in the second scanning area, from the light source→the original in the second scanning area→M2 second position→M3→image pickup unit. 6. The scanning device according to claim 1, characterized in that, the first carrying seat is provided with a first reflective mirror (M1), and the second carrying seat is provided with a second reflective mirror (M2), a third The reflector (M3) is the switchable reflector and a fourth reflector (M4); the light provided by the light source is directed towards the travel route of the original in the first scanning area, from the first light source to the first The original document in the scanning area → M1 → M2 → M3 first position → image pickup unit, and the light provided by the second light source is directed towards the travel path of the original document located in the second scanning area, and the light source → the second scanning area Original → M4 → M3 second position → image pickup unit. 7. The scanning device according to claim 1, wherein the switchable reflector is a rotatable reflector for switching between the first position and the second position in a rotational manner. 8. The scanning device according to claim 1, wherein the switchable reflector is a semi-transparent reflector, when the light is incident on the front of the reflector, the light is reflected, when the light When incident from the back, light can pass through. 9. The scanning device according to claim 1, wherein the adjusting device for the image pickup unit performs a horizontal displacement movement to adjust the change amount of the total optical path length. 10 . The scanning device according to claim 1 , wherein the image pickup unit adjustment device performs automatic focus adjustment to adjust the change amount of the total optical path length. 11 .

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