TWI497976B - Contact image-sensing module - Google Patents

Description

Contact image sensing module

The present invention relates to the field of scanning devices, and more particularly to a contact image sensing module.

In the scanner, commonly used image sensing components are classified into a contact image sensor (CIS) and a charge-coupled device (CCD). Compared with charge-coupled components, contact image sensors have been widely used in home low-cost scanners and fax machines because of their low cost and ease of fabrication.

In the scanner, a contact image sensing module is generally formed by a light emitting diode (LED) light source, a glass plate, a lens group and a contact image sensing component. The glass plate has a rectangular cross section, and the object to be scanned and the light source of the light emitting diode are respectively located on the upper and lower sides of the glass plate, and the light emitted by the light source of the light emitting diode is obliquely incident on the object to be scanned through the glass plate and generates a reflection. The light is transmitted to the lens element through the glass plate, and the reflected light is guided to the contact image sensing element by the lens element, and the optical signal is converted into an electrical signal by the contact image sensing element. In order to make the light emitted by the light-emitting diode light source pass through the glass plate and evenly spread on the object to be scanned, a distance between the light-emitting diode light source and the glass plate is required to spread the light, thereby causing the image sensor. The structure is not compact and the space utilization is not high.

In view of this, it is necessary to provide a compact and uniform illumination image. Test module.

A contact image sensing module includes a contact image sensing component, a lens group, a glass plate and a light emitting diode light source, the glass plate has a wedge shape in cross section, and includes a light incident surface, a first a light emitting surface and a second light emitting surface, the light emitting diode light source is disposed on a light incident surface side of the glass plate, the lens group is located between the second light emitting surface of the glass plate and the contact image sensing element The light emitted by the light emitting diode light source enters the glass plate from the light incident surface of the glass plate, and a part of the light entering the glass plate from the light incident surface is directly emitted through the first light emitting surface of the glass plate to illuminate an object to be scanned, and Another portion of the light entering the glass plate is reflected by the second light-emitting surface and then emitted through the first light-emitting surface to illuminate the object to be scanned.

Compared with the prior art, the contact image sensing module has a compact structure, a small occupied space, and can uniformly illuminate an object to be scanned in a wide range.

100‧‧‧Contact Image Sensing Module

10‧‧‧ boards

20‧‧‧Contact image sensing components

21‧‧‧Contact Image Sensor

30‧‧‧Hosting

31‧‧‧through hole

40‧‧‧ lens group

41‧‧‧ lenticular lens

50‧‧‧ glass plate

51‧‧‧Into the glossy surface

52‧‧‧The first glazing

53‧‧‧Second glazing

60‧‧‧Lighting diode source

61‧‧‧Light guide plate

62‧‧‧Lighting diode

611‧‧‧light side

612‧‧‧ light side

613‧‧‧Sawtooth structure

70‧‧‧ objects to be scanned

1 is a schematic diagram of a combination of a preferred embodiment of a contact image sensing module of the present invention.

2 is an exploded view of the contact image sensing module of FIG. 1.

3 is an exploded view of the contact image sensing module of FIG. 1 viewed from another angle.

4 is a cross-sectional view of the contact image sensing module of FIG. 1.

The present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 to FIG. 4 show a preferred embodiment of the contact image sensing module 100 of the present invention. The contact image sensing module 100 includes a circuit board 10 , a contact image sensing component 20 , a carrier 30 , a lens assembly 40 , a glass panel 50 , and a light emitting diode source 60 . The components of the contact image sensing module 100 can be set together In a scanner or fax machine housing (not shown).

The circuit board 10 is vertically elongated and horizontally disposed. The contact image sensing component 20 is disposed on the circuit board 10. The contact image sensing device 20 includes a plurality of contact image sensors 21 arranged in three rows along the longitudinal direction of the circuit board 10.

The carrier 30 is located above the circuit board 10. The carrier 30 has an elongated shape and has a rectangular cross section. The carrier 30 is provided with a plurality of through holes 31 extending in the vertical direction, and the through holes 31 are arranged in three rows along the longitudinal direction of the carrier 30. The lens group 40 is located directly above the contact image sensing element 20 and includes a plurality of lenticular lenses 41. The lenticular lens 41 is vertically disposed and correspondingly received in the through hole 31 of the carrier 30. The lower end of each of the lenticular lenses 41 is opposite to a sensing unit of the contact image sensing element 20.

The glass plate 50 is located above the lens group 40 and has an elongated shape. The glass plate 50 has a wedge shape in cross section, and includes a light incident surface 51, a first light exit surface 52 and a second light exit surface 53. The light incident surface 51 is located on one side of the glass plate 50 and is inclined downward toward the lens group 40. The thickness of the glass plate 50 is gradually thinned from the side where the light incident surface 51 is located to the other opposite side. The first light-emitting surface 52 is horizontally disposed at the top of the glass plate 50, and the first light-emitting surface 52 is parallel to the top surface of the lenticular lens 41. The second light-emitting surface 53 is located at the bottom of the glass plate 50 and opposite to the top end of the lenticular lens 41 of the lens group 40 . The lens group 40 is located between the second light-emitting surface 53 and the contact image sensing element 20 .

The light-emitting diode light source 60 includes a light guide plate 61 and two light-emitting diodes 62. The light guide plate 61 is disposed on the light incident surface 51 side of the glass plate 50, and has a light exiting side 611 opposite to the light incident surface 51 of the glass plate 50 and two light incident sides 612 at both ends. The light guide plate 61 is disposed near the light incident surface 51 of the glass plate 50, and the two light emitting diodes 62 are disposed on the light guide plate At both ends of the plate 61, the light emitted from the light-emitting diode 62 enters the light guide plate 61 from the light-incident side 612 and is uniformly led out from the light-emitting side 611. The light-emitting side 611 of the light guide plate 61 is formed with a plurality of sawtooth structures 613 along the longitudinal direction of the light guide plate 61 to make the light emitted from the light-emitting side 611 of the light guide plate 61 more uniform. In the light-emitting diode light source 60, the light-emitting diode 62 may be provided only at one end of the light guide plate 61, and the number of the light-emitting diodes 62 provided at each end of the light guide plate 61 may be plural.

As shown in FIG. 4 , when the object to be scanned 70 is scanned by using the contact image sensing module 100 , the object to be scanned 70 is disposed at the top end of the glass plate 50 and the first light emitting surface 52 of the glass plate 50 . relatively. The light emitted from the light guide plate 61 of the light-emitting diode light source 60 enters the glass plate 50 from the light-incident surface 51 of the glass plate 50. Since the cross-section of the glass plate 50 is wedge-shaped, a part of the light entering the glass plate 50 from the light-incident surface 51 is obtained. Directly passing through the first light-emitting surface 52 of the glass plate 50 to illuminate the object 70 to be scanned, and another portion of the light entering the glass plate 50 from the light-incident surface 51 is reflected by the second light-emitting surface 53 and then emitted through the first light-emitting surface 52. The object to be scanned 70 is irradiated so that the light emitted from the glass plate 50 can uniformly illuminate the object 70 to be scanned over a wide range. The light that is incident on the object to be scanned 70 through the first light-emitting surface 52 is reflected by the object 70 to be scanned back to the glass plate 50, and is emitted by the second light-emitting surface 53 of the glass plate 50 to be incident on the lenticular lens 41 of the lens group 40. . The lenticular lens 41 guides the light emitted from the second light-emitting surface 53 of the glass plate 50 to the contact image sensor 21 of the contact image sensing device 20, and the contact image sensing device 20 collects the lens group 40. The linear optical image is converted into a digital image signal, and the digital image signal is transmitted from the circuit board 10 to the outside of the contact image sensing module 100.

In the contact image sensing module 100, the cross section of the glass plate 50 is wedge-shaped, and a part of the light entering the glass plate 50 from the light incident surface 51 directly passes through the first light emitting surface of the glass plate 50. 52 is emitted to illuminate the object 70 to be scanned, and another portion of the light entering the glass plate 50 from the light incident surface 51 is reflected by the second light exit surface 53 and then emitted through the first light exit surface 52 to illuminate the object 70 to be scanned, thereby emitting light The light guide plate 61 of the polar body light source 60 can be disposed as close as possible to the light incident surface 51 of the glass plate 50, even to the light incident surface 51 of the glass plate 50, and the light emitted by the first light exit surface 52 of the glass plate 50 is still The object to be scanned 70 can be uniformly illuminated, so that the structure of the contact image sensing module 100 is compact, and the space occupied by the contact image sensing module 100 is reduced. Moreover, since the contact image sensing module 100 can uniformly illuminate the object to be scanned 70 in a wide range, the number of the lenticular lenses 41 of the lens group 40 and the contact of the contact image sensing element 20 can be correspondingly increased. The number of image sensors 21, which in turn increases the scanning speed. For example, in the present embodiment, the lenticular lens 41 of the lens group 40 and the contact image sensor 21 of the contact image sensing element 20 are each provided in three rows.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100‧‧‧Contact Image Sensing Module

10‧‧‧ boards

20‧‧‧Contact image sensing components

30‧‧‧Hosting

40‧‧‧ lens group

50‧‧‧ glass plate

60‧‧‧Lighting diode source

61‧‧‧Light guide plate

62‧‧‧Lighting diode

Claims (7)

A contact image sensing module includes a contact image sensing component, a lens group, a glass plate and a light emitting diode light source, wherein the glass plate has a wedge shape in cross section, including a light entering a first light exiting surface and a second light emitting surface, the light incident surface being located at one side of the glass plate and inclined downward toward the lens group, the first light emitting surface being located at the top of the glass plate and disposed horizontally The light emitting diode light source is disposed on a light incident surface side of the glass plate, and the lens group is located between the second light emitting surface of the glass plate and the contact image sensing element, and the light emitted by the light emitting diode light source The light entering surface of the glass plate enters the glass plate, and a part of the light entering the glass plate from the light incident surface is directly emitted through the first light emitting surface of the glass plate to illuminate an object to be scanned, and another part of the light entering the glass plate through the light incident surface passes through The second illuminating surface is reflected and then emitted through the first illuminating surface to illuminate the object to be scanned. The contact image sensing module of claim 1, wherein the light emitting diode comprises a light guide plate and at least one light emitting diode, wherein the light guide plate is disposed on a light incident side of the glass plate. The light emitting diode is disposed at one end of the light guide plate. The contact image sensing module of claim 2, wherein the light guide plate is attached to the light incident surface of the glass plate. The contact image sensing module of claim 2, wherein the light guide plate is provided with a plurality of sawtooth structures on a side opposite to the light incident surface of the glass plate. The contact image sensing module of claim 1, wherein the lens group comprises a plurality of cylindrical lenses, and an end of the cylindrical lens adjacent to the glass plate is parallel to the first light emitting surface of the glass plate. The contact image sensing module of claim 1, further comprising a carrier, the carrier is provided with a plurality of through holes, the lens group is a plurality of cylindrical lenses, and the cylindrical lens corresponds to It is housed in the through hole of the carrier. The contact image sensing module of claim 1, further comprising a circuit board on which the contact image sensing component is disposed.