CN2491905Y - Image scanner with reflection and transmission scanning function - Google Patents

Abstract

An image scanner with reflection and penetration scanning functions. A copying device with a simple structure, low cost and high scanning image quality is provided. The utility model comprises a housing, a bearing base placed in the housing, and first and second scanning platforms arranged on and in the housing for placing reflection drafts and penetration drafts; first and second light sensing elements with a first and second number of sensing pixel points for converting light signals into electrical signals are fixedly arranged on the bearing base, and first and second light transmission structures focus the light signals of the reflection draft and the penetration draft to the first and second light sensing elements.

Description

Image scanner with reflection and transmission scanning function

technical field

The utility model belongs to a copying device, in particular to an image scanner with reflection and penetration scanning functions.

Background technique

Conventional image scanners (scanner) can be roughly divided into two categories according to different objects to be scanned. The first type is a reflective manuscript image scanner used to scan reflective manuscripts such as document paper; the second category is a transmissive manuscript image scanner used to scan positive and negative transparencies such as slides and negatives. Generally, the resolution requirements of reflective image scanners are lower; the resolution requirements of transmissive image scanners are higher. Because the two have different requirements for resolution, the cost and price are also quite different. Among them, reflective image scanners usually appear in the form of flat bed scanners, while transmissive image scanners appear in the form of film scanners.

However, with the continuous improvement of the resolution of the flat bed scanner and the expansion of the application range, the transparent document scanning function is also integrated into the flat bed scanner to form a transparent document scanning function The flat bed scanner is used to enhance the added value of the flat bed scanner.

At present, the flat bed scanners with the function of scanning transparent documents on the market mainly focus on the following two methods of design:

(1) Switch between different lenses or charge-coupled devices (CCD) with the same optical path design and transmission structure;

(2) Using different optical path designs with the same lens or charge-coupled device (CCD).

in:

The first method of switching different lenses or charge-coupled devices (CCDs) with a transmission structure will increase error variables and lead to a low production yield.

The second method of using different optical path designs with the same lens or charge-coupled device (CCD) will be difficult to achieve both in terms of cost and image quality. Because under the same magnification lens, in order to take into account the high-resolution scanning image quality of small-sized negatives and the number of pixels required for scanning large-sized documents, the manufacturer must choose a charge-coupled device (CCD) with a large density and a large number of pixels. ), taking A4 size and a charge-coupled device (CCD) with a resolution of 3600dpi, the number of pixels is about 30600, and the cost price is about 50-60 times that of 600dpi, and 15-20 times that of 1200dpi, resulting in the cost of the product Too high; if a lower-priced charge-coupled device (CCD) is used, the high-quality image scanning effect of small-sized negatives cannot be achieved under the above-mentioned architecture design.

Contents of the invention

The purpose of the utility model is to provide an image scanner with simple structure, low cost and high scanning image quality, which has reflective and penetrating scanning functions.

The utility model comprises a housing, a bearing base placed in the housing, a first scanning platform arranged on the housing for placing reflective manuscripts, and a second scanning platform arranged in the housing for placing penetrating manuscripts; A first light-sensing element with a first number of sensing pixels for converting optical signals into electrical signals and a second number of sensing pixels for converting optical signals into electrical signals are fixed on the carrier base The second light sensing element, the first light transmission structure focusing the reflected light signal to the first light sensing element, and the second light transmission structure focusing the transmitted light signal to the second light sensing element.

in:

The housing is a platform image scanner housing.

The first and second photoelectric sensing elements are completed by charge-coupled devices (CCD).

The first optical transmission structure includes a first reflective mirror group fixed on the carrier base for reflective transmission of the optical signal reflected by the reflective manuscript and focusing the optical signal reflected by the first reflective mirror group to the first photoelectric The first lens group on the sensing element.

The second optical transmission structure includes a second reflective mirror group fixed on the carrier base to reflect and transmit the optical signal penetrating through the draft and to focus the optical signal reflected by the second reflective mirror group to the second The second lens group on the photoelectric sensing element.

The reflective draft and the transparent draft are paper files and negatives respectively.

A first light source is fixed on the bearing base to provide a light source for scanning the manuscript on the first scanning platform.

A second light source that provides a light source for scanning through the manuscript on the second scanning platform is fixedly installed on the carrying base.

The casing is fixedly provided with a second light source of the backlight module that provides a light source for penetrating the manuscript on the second scanning platform for scanning.

The top of the first scanning platform is provided with a third light source that provides a light source for scanning the second transparent manuscript on the first scanning platform; the optical signal that penetrates the second transparent manuscript is focused and transmitted through the first light transmission structure to the first photoelectric sensing element for receiving.

The size of the second draft is larger than the draft.

The size of the transparent draft is smaller than the size of the reflective draft.

The resolution of the second light transmission structure is better than that of the first light transmission structure.

Since the utility model includes a housing, a bearing base placed in the housing, a first and a second scanning platform provided on the housing and in the housing for placing reflective manuscripts and penetrating manuscripts; First and second numbers of first and second light-sensing elements that convert optical signals into electrical signals and a plurality of sensing pixels, focusing reflective and transmissive light signals to the first and second light-sensing elements The first and second light transmission structures. The optical path design of the reflective draft and the penetrating draft are independent, and they are equipped with different resolution photoelectric sensing elements, which meet the actual needs of consumers in use, especially when the penetrating draft requires high-resolution scanning quality; the two independent optical paths are respectively Fixed on the same supporting base, it can be commissioned separately and does not need other switching mechanisms inside, so there are few variables and high production yield; users can choose two different scanning paths according to different resolution requirements, low resolution large Area or high-resolution small-area scanning of penetrating manuscripts can avoid the loss of low production yield due to the increase in error variables caused by switching different photoelectric sensing elements due to the transmission structure; not only the structure is simple, the cost is low, and the scanning image High quality, thereby reaching the purpose of the utility model.

Description of drawings

Figure 1 is a schematic cross-sectional view of the partial structure of the bearing base of the utility model.

Fig. 2 is a schematic cross-sectional view of the partial structure of the bearing base of the present invention (using the backlight template as the second light source).

Fig. 3 is a schematic top view of the structure of the utility model.

Fig. 4 is a schematic sectional view of the structure of the utility model.

Fig. 5 is a schematic perspective view of the internal structure of the utility model.

Fig. 6 is a schematic perspective view of the internal structure of the utility model (using the backlight template as the second light source).

Fig. 7 is a schematic perspective view of the structure of the utility model.

Detailed ways

As shown in Fig. 3, Fig. 4 and Fig. 7, the utility model includes a housing 1, a bearing base 2 placed in the housing, a first scanning platform 11 arranged on the housing 1 for placing reflective manuscripts, and a The second scanning platform 12, stepping motor 3, guide rail 4 and the upper cover 5 which is a flip cover or a light source module are provided in the casing 1 for placing penetrating manuscripts.

The casing 1 is a flatbed image scanner casing.

As shown in FIG. 1 , a first light-sensing element 21 with a first number of sensing pixels for converting optical signals into electrical signals is fixed on the carrier base 2 , and a second number of light-sensing elements 21 is fixed on the carrier base 2 . The second light-sensing element 23 that converts electrical signals into a plurality of sensing pixels, the first light transmission structure 22 that focuses the reflected light signal to the first light-sensing element 21, and focuses the transmitted light signal to the second light The second light transmission structure 24 , the first light source 25 , the second light source 26 and the third light source 27 of the sensing element 23 .

According to the actual application, the reflective manuscript is usually a paper file in A4 format; the transparent manuscript is a 35mm negative film, so the size of the transparent manuscript is usually smaller than that of the reflective manuscript. When performing a scanning action, the carrier base 2 and the first scanning platform 11, the second scanning platform 12, the first photoelectric sensing element 21, the first optical transmission device 22, the second photoelectric sensing element 23 and The second optical transmission device 24 is driven by the stepping motor 3 to move along the guide rail.

As shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the second scanning platform 12 is composed of a plurality of film bearing seats.

The first and second photoelectric sensing elements 21 and 23 are completed by charge-coupled devices (CCD). The first number of the first photo-sensing elements 21 is greater than the second number of the second photo-sensing elements 23 .

The first optical transmission structure 22 includes a first reflective mirror group 221 fixed on the carrier base 2 to reflect and transmit the optical signal reflected by the reflective manuscript and to focus the optical signal reflected by the first reflective mirror group 221. to the first lens group 222 on the first photosensitive element 21 .

The second optical transmission structure 24 includes a second reflective mirror group 241 fixed on the carrier base 2 to reflect and transmit the optical signal transmitted through the manuscript and to reflect the optical signal from the second reflective mirror group 241. Focusing on the second lens group 242 on the second photoelectric sensing element 23 .

In order to improve the lack of conventional means, the first photoelectric sensing element 21, the first light transmission structure 22, the second photoelectric sensing element 23 and the second light transmission structure 24 are all fixed on the carrier base 2, so as to avoid Due to the increase of error variables caused by the transmission structure switching different lenses or charge-coupled devices (CCD), the production yield is too low. In order to take into account the high-resolution scanning image quality of small-sized negatives and the number of pixels required for scanning large-sized documents, the second optical transmission structure 24 with better resolution than the first optical transmission structure 22 is selected, and the resolution and pixel The second photosensitive elements 23 whose dots are lower than the first photosensitive elements 21 are used to scan small-sized negatives.

For example, in order to take into account the scanning quality of 35mm negatives and A4 format paper documents, the A4 size and resolution of 1200dpi charge-coupled devices (the number of pixels is about 10200 points, the price is about 8 to 12 US dollars) to complete the first The photoelectric sensing element 21, and the second photoelectric sensing element 23 is completed with an A4-sized charge-coupled element (the number of pixels is about 5100 points, and the price is about 3-5 US dollars) but the resolution is only 600dpi. And the price of a charge-coupled device (CCD) with a resolution of 3600dpi is US$150-200. In this example, the cost of the charge-coupled device can be saved a lot. The resolution of the first lens group 222 in the first light transmission structure 22 is 1200 dpi, and the resolution of the second lens group 242 in the second light transmission structure 24 is 3600 dpi.

The first light source 25 fixedly arranged on the supporting base 2 is a light source for scanning reflected manuscripts on the first scanning platform 11 , such as paper documents in A4 format. The second light source 26 fixedly arranged on the supporting base 2 is a light source for scanning the penetrating manuscript on the second scanning platform 12 , such as a 35mm film. However, in order to reduce the number of assembly parts, assembly time and occupied space of the scanner, as shown in Figure 2, the backlight module can be used as the second light source 26a, so that the thickness of the scanner and the assembly can be effectively reduced. Number of parts and assembly time.

The third light source 27 serves as a light source for providing a large transparent manuscript placed on the first scanning platform 11, such as a transparencies in A4 format for low-resolution scanning, it is arranged above the first scanning platform 11, and uses the first light The transmission structure 22 focuses and transmits to the first photoelectric sensing element 21 for reception; wherein, the third light source can be a single light source of a light tube, or a backlight module.

As shown in FIG. 3 , FIG. 4 , FIG. 5 , and FIG. 6 , the bearing base 2 is driven by a stepping motor 3 to move along the guide rail 4 .

In summary, this case can achieve the following functions:

1. Independent design of optical path: The optical path design of reflective draft and penetrating draft are independent, and they are equipped with lens groups and CCD photoelectric sensing elements with different resolution requirements, which meet the actual needs of consumers in use, especially when the penetrating draft requires high resolution scan quality.

2. Simple structure: the above two independent optical systems are respectively fixed on the same supporting base, which can be commissioned separately and no other switching mechanism is needed inside, so there are fewer variables and higher production yield.

3. Optimizing the transmission system: Due to the modularization of the optical-mechanical system, it is only necessary to use the conventional single transmission system to achieve the purpose of transmission scanning without the need for other transmission mechanisms.

4. Users can choose two different scanning paths (upper and lower) according to different requirements of resolution, low-resolution large-area or high-resolution small-area scanning of penetrating manuscripts.

5. Product diversification: The product can be cut into general flip cover (without the third light source 27) and combined with a kind of penetrating draft (high resolution small area) and with the third light source 27 to form two kinds of penetrating draft scanning according to the demand. function, wherein the third light source 27 can be in the form of a backlight panel or a synchronous movement of lamp tubes. Therefore, the lack of conventional means can be completely resolved, and the main purpose of developing this case can be achieved.

Claims (13)

1, a kind of image scanner that has reflection and penetrate scan function, it comprises housing, places the bearing base in the housing and is arranged at first scanning platform that reflects original text on the housing for storing; Set firmly first Photosensing Units that light signal is converted to a plurality of sensor pixel points of electric signal with first quantity and the first smooth transfer structure of focus reflection original text light signal to the first Photosensing Units on the bearing base; It is characterized in that being provided with in the described housing for penetrating second scanning platform that original text is put; Set firmly the second smooth transfer structure that second Photosensing Units that light signal is converted to a plurality of sensor pixel points of electric signal with second quantity and focusing penetrate original text light signal to the second Photosensing Units on the bearing base.

2, the image scanner that has reflection and penetrate scan function according to claim 1 is characterized in that described housing is the flat-bed color image scanners housing.

3, the image scanner that has reflection and penetrate scan function according to claim 1 is characterized in that described first and second photoelectric sensing element system is finished with charge coupled cell (CCD).

4, according to claim 1 have reflection and penetrate the image scanner of scan function, it is characterized in that the described first smooth transfer structure includes to be fixedly arranged on bearing base and to reflect first reflector group of transmission and focus to first lens combination on first photoelectric sensing element in order to the light signal that first reflector group is reflected in order to the light signal that will reflect original text and reflect.

5, according to claim 1 have reflection and penetrate the image scanner of scan function, it is characterized in that the described second smooth transfer structure includes to be fixedly arranged on bearing base and to reflect second reflector group of transmission and focus to second lens combination on second photoelectric sensing element in order to the light signal with the reflection of second reflector group in order to the light signal that will penetrate original text and penetrate.

6, the image scanner that has reflection and penetrate scan function according to claim 1 is characterized in that described reflection original text and penetrates original text being respectively paper document and egative film.

7, the image scanner that has reflection and penetrate scan function according to claim 1 is characterized in that setting firmly on the described bearing base providing and reflects first light source that original text carries out the scanning motion light source on first scanning platform.

8, according to claim 1 have reflection and penetrate the image scanner of scan function, it is characterized in that setting firmly on the described bearing base providing penetrating the secondary light source that original text carries out the scanning motion light source on second scanning platform.

9, according to claim 1 have reflection and penetrate the image scanner of scan function, it is characterized in that described housing sets firmly to provide to penetrate the secondary light source that original text carries out the backlight source module of scanning motion light source on second scanning platform.

10, according to claim 1 have reflection and penetrate the image scanner of scan function, and the top that it is characterized in that described first scanning platform is provided with to provide second on first scanning platform penetrated the 3rd light source that original text carries out the light source of scanning motion; Penetrating second light signal that penetrates original text is to focus on to be sent on first photoelectric sensing element through the first smooth transfer structure to receive.

11, the image scanner that has reflection and penetrate scan function according to claim 10 is characterized in that the described second size system that penetrates original text penetrates original text greater than this.

12, the image scanner that has reflection and penetrate scan function according to claim 1 is characterized in that the described size of original text that penetrates is less than reflection original text size.

13, according to claim 11 have reflection and penetrate the image scanner of scan function, and the resolution that it is characterized in that the described second smooth transfer structure is good than the resolution of the first smooth transfer structure.

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