TWI495324B - Optical system and scanner using same - Google Patents

Description

Optical system and scanner using the same

The present invention relates to an optical system and a scanner to which the optical system is applied.

With the increasing use of electronic devices, scanners are an indispensable peripheral device for general PC users or companies. A scanner is a device that extracts images, scans photos, text, graphics, etc., and converts them into a digital format that can be displayed, edited, stored, and exported by a computer.

However, the conventional scanner uses a moving linear light source to project light onto a line of images to be scanned, and then the light reflected back through the line of images passes through the optical element and is then projected to the image sensor. In the continuous movement of the linear light source, the image of the entire file to be scanned is captured. However, since the conventional scanner performs the image-by-line scanning to complete the image capturing, so that the scanning speed is slow, when a large number of files need to be scanned, a large amount of time may be wasted.

In view of the above, it is necessary to provide an optical system capable of achieving fast image capture and a scanner to which the optical system is applied.

An optical system includes a housing, a light source module, a mirror, and an image sensor; the housing includes a front panel for placing a scanning file, a rear panel opposite the front panel, and a connection a lower side plate between the front panel and the rear panel, The light source module is disposed at an intersection of the front panel and the lower side panel, the mirror end abuts against the front panel and faces the front panel, and the image sensor is disposed at an intersection of the rear panel and the lower side panel; The light emitted by the light source module is projected onto the mirror, and after being reflected by the mirror, a uniform surface light source is formed on the front panel, and the image sensor collects the light reflected by the scanning file placed on the front panel.

A scanner includes an optical system, an A/D processing module, an image processing module, and a storage module; the optical system includes a housing, a light source module, a mirror, and an image sensor; The housing includes a front panel for placing a scan file, a rear panel opposite the front panel, and a lower side panel connected between the front panel and the rear panel, the light source module being disposed at the intersection of the front panel and the lower panel The mirror is abutted against the front panel and facing the front panel, and the image sensor is disposed at the intersection of the rear panel and the lower side panel; the light emitted by the light source module is projected to the mirror Forming a uniform surface light source on the front panel after being reflected by the mirror, the image sensor collecting light reflected by the scanning file placed on the front panel; the A/D processing module is used for the image sensor The captured image signal is subjected to analog/digital conversion, the image processing module is for editing an image, and the storage module is configured to store the processed image.

Compared with the prior art, the optical system provided by the present invention and the light emitted by the light source in the scanner using the optical system form a surface light source on the front panel on which the scanning file is placed, and then use the image sensor to scan the entire image. The light reflected from the file is captured to achieve a fast scan of the scan file.

110‧‧‧Scanner

100‧‧‧Optical system

10‧‧‧ Shell

20‧‧‧Light source module

30‧‧‧Mirror

40‧‧‧Image Sensor

11‧‧‧ front panel

12‧‧‧ rear panel

13‧‧‧Upper side panel

14‧‧‧ Lower side panel

15‧‧‧left side panel

16‧‧‧right board

111‧‧‧Effective area

21‧‧‧Light source

22‧‧‧Light guide plate

23‧‧‧Enclosed space

31‧‧‧reflecting surface

50‧‧‧A/D processing module

60‧‧‧Image Processing Module

70‧‧‧ memory module

FIG. 1 is a schematic perspective view of an optical system according to an embodiment of the present invention.

2 is a cross-sectional view of the scanner of the application optical system of FIG. 1.

3 is a schematic view of the optical path of the optical system of FIG. 1.

The technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 to FIG. 3, an optical system 100 for scanning a file to be scanned is provided in an embodiment of the present invention. The optical system 100 includes a housing 10, a light source module 20, a mirror 30, and a mirror. Image sensor 40.

The outer casing 10 is a cube having a trapezoidal cross section, and includes a front panel 11, a rear panel 12, an upper side panel 13, a lower side panel 14, a left side panel 15, and a right side panel 16. The front panel 11 and the rear panel 12 are parallel to each other, and the area of the rear panel 12 is smaller than that of the front panel 11. The upper side plate 13 and the lower side plate 14 and the left side plate 15 of the right side plate 16 are all trapezoidal and are sequentially connected between the front panel 11 and the rear panel 12. The angle γ between the front panel 11 and the lower side panel 14 is about 49 degrees, and the front panel 11 has a transparent effective area 111. The to-be-scanned file is placed in the effective area 111 during scanning. . A black light absorbing sheet is attached to the left side plate 15 and the right side plate 16 for absorbing light incident on the left side plate 15 and the right side plate 16 to prevent stray light from being reflected by multiple reflections of light, and the image sensor is The imaging of 40 caused an effect.

The light source module 20 includes a light source 21 and a light guide plate 22 . The light guide plate 22 is fixed between the front panel 11 and the lower side panel 14 by a glue bond and forms a closed space 23 . The light source 21 is received in the closed space 23, and the angle between the light guide plate 22 and the lower side plate 14 can be adjusted to adjust the angle of the light emitted from the light source 21. In this embodiment, When the angle α between the light guide plate 22 and the lower side plate 14 facing the front panel 11 is about 66 degrees, all the light emitted from the light guide plate 22 is projected onto the mirror 30. In addition, in order to ensure that the light passing through the light guide plate 22 is projected in a predetermined direction, the light guide plate 22 may be adjacent to the front panel 11 and the lower side panel 14, respectively. A light shield is provided on the side to control the angle at which the light is emitted. In this embodiment, the light source 21 is a strip-shaped light-emitting diode, and the light guide plate 22 is a strip-shaped light guide plate. It can be understood that the light source module 20 can further include a plurality of optical prisms for adjusting the light emitted from the light source 21.

One side of the mirror 30 is fixedly connected to the upper side plate 13 , and the other side is fixedly connected to the rear panel 12 . The mirror 30 has a reflecting surface 31 , and the reflecting surface 31 faces the front panel 11 . . In this embodiment, an angle β between the mirror 30 and the lower side plate 14 toward the front panel 11 is about 94 degrees, thereby ensuring that the light reflected by the mirror 30 can be in the effective area on the front panel 11. A uniform surface light source is formed in 111.

The image sensor 40 is a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The image sensor 40 is disposed at an intersection of the rear panel 12 and the lower side panel 14 and below the mirror 30. The effective area 111 on the front panel 11 is located within the viewing angle range of the image sensor 40. The image sensor 40 collects light reflected by the scanning file placed on the front panel 11 to achieve fast capture of the image of the scanned file.

The embodiment of the present invention further provides a scanner 110. The scanner 110 includes the optical system 100, an A/D processing module 50, an image processing module 60, and a storage module 70 as described above. The A/D processing module 50 is configured to perform analog/digital conversion on an image signal captured by the image sensor 40. The image processing module 60 is configured to edit an image, and the storage module 70 is used by the storage module 70. The processed image is stored.

During use, the to-be-scanned file is first placed within the effective area 111 of the front panel 11. The light emitted from the light source 21 is adjusted to be output through the light guide plate 22 The light that is directed toward the mirror 30 is reflected by the mirror 30 to form a uniform surface light source within the effective area 111 of the front panel 11. Since a function of an image, a character, or the like on the to-be-scanned file forms a diffuse reflection on the light incident on the to-be-scanned position, a part of the light is projected to the sensing area of the image sensor 40. The image sensor 40 captures an image of the file to be scanned located on the effective area 111, thereby achieving fast capture of the file to be scanned, and effectively improving the scanning speed of the file. The image signals collected by the image sensor 40 are processed by the A/D processing module 50 and the image processing module 60 and stored in the storage module 70.

The optical system provided by the present invention and the light emitted by the light source in the scanner using the optical system form a surface light source on the front panel on which the scanning file is placed, and then use the image sensor to collect light reflected by the entire scanning file. Thereby a fast scan of the scan file is achieved.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

110‧‧‧Scanner

10‧‧‧ Shell

20‧‧‧Light source module

30‧‧‧Mirror

40‧‧‧Image Sensor

11‧‧‧ front panel

12‧‧‧ rear panel

13‧‧‧Upper side panel

14‧‧‧ Lower side panel

111‧‧‧Effective area

21‧‧‧Light source

22‧‧‧Light guide plate

23‧‧‧Enclosed space

31‧‧‧reflecting surface

50‧‧‧A/D processing module

60‧‧‧Image Processing Module

70‧‧‧ memory module

Claims (8)

An optical system includes a housing, a light source module, a mirror, and an image sensor; the housing includes a front panel for placing a scanning file, a rear panel opposite the front panel, and a connection a lower side panel between the front panel and the rear panel, the light source module is disposed at an intersection of the front panel and the lower side panel, the mirror end abuts against the rear panel and faces the front panel, and the image sensing The device is disposed at an intersection of the rear panel and the lower side panel; the light emitted by the light source module is projected to the mirror, and after being reflected by the mirror, a uniform surface light source is formed on the front panel, and the image sensor is placed in front of the image sensor. The light reflected from the scan file on the panel. The optical system of claim 1, wherein: the outer casing is a trapezoidal cube, and the outer casing further comprises an upper side plate opposite to the lower side plate, the mirror end abutting against the upper side plate. The optical system of claim 1, wherein the light source module comprises a light source and a light guide plate, the light guide plate is fixed between the front panel and the lower side panel and forms a closed space, the light source It is housed in the enclosed space. The optical system of claim 3, wherein the light source is a strip-shaped light-emitting diode, and the light guide plate is a strip-shaped light guide plate. The optical system of claim 3, wherein the light guide plate is configured to adjust an angle of light emitted from the light source such that all of the light emitted from the light source is projected to the mirror. The optical system of claim 3, wherein an angle between the front panel and the lower side panel is 49 degrees, and an angle between the light guide panel and the lower side panel toward the front panel is 66 degrees. The angle between the mirror and the lower side plate toward the front panel is 94 degrees. The optical system of claim 1, wherein: the front panel has an active area, the effective area being within a viewing angle of the image sensor. A scanner includes an optical system, an A/D processing module, an image processing module, and a storage module; the optical system includes a housing, a light source module, a mirror, and an image sensor; The housing includes a front panel for placing a scan file, a rear panel opposite the front panel, and a lower side panel connected between the front panel and the rear panel, the light source module being disposed at the intersection of the front panel and the lower panel The mirror is abutted against the front panel and facing the front panel, and the image sensor is disposed at the intersection of the rear panel and the lower side panel; the light emitted by the light source module is projected to the mirror Forming a uniform surface light source on the front panel after being reflected by the mirror, the image sensor collecting light reflected by the scanning file placed on the front panel; the A/D processing module is used for the image sensor The captured image signal is subjected to analog/digital conversion, the image processing module is for editing an image, and the storage module is configured to store the processed image.