CN218003850U - Light source device and scanning imaging equipment - Google Patents

Abstract

The utility model provides a light source device and scanning imaging equipment. The light source device includes: a frame; the circuit board is arranged in the frame; the light-emitting piece is arranged on the circuit board; the light guide piece, the light guide piece sets up in the light-emitting side of light-emitting piece, and the light guide piece includes incident surface, plane of reflection and emitting surface, and the plane of reflection is one or more, and the light of light-emitting piece transmission gets into the light guide piece by the incident surface, and through one or more reflection of one or more planes of reflection by the emitting surface outgoing, the shape of at least one in incident surface and the emitting surface is the cylinder. The utility model provides a light source device among the prior art have the problem that is difficult to satisfy the requirement of dark field illumination.

Description

Light source device and scanning imaging equipment

Technical Field

The utility model relates to a scanning imaging equipment technical field particularly, relates to a light source device and scanning imaging equipment.

Background

At present, the field of scanning imaging devices is growing mature. The linear array CIS camera is widely applied to the fields of currency detection, document scanning, printing and the like as scanning imaging equipment, and an external light source device of the linear array CIS camera mainly comprises an LED array, a circuit board, a light guide rod, a glass cover plate and a shell and is used for auxiliary illumination.

In practical applications, when the line CIS camera scans an object with a smooth surface, such as a code on the surface of a metal part, characters on a smooth paper surface, paper money stuck with an adhesive tape, and the like, the surface with high reflectivity may cause an imaging glare problem, and it is difficult to distinguish the characters or fine structures on the surface of the object, and at this time, the imaging effect is usually improved by adopting a dark field illumination mode. However, since the linear array CIS camera has a short working distance and a linear field of view, the external light source device for dark field illumination must have a small size, which severely limits the type selection of the LED light source and the design of the light guide rod, so that the brightness of the light source device is difficult to meet the requirement of dark field illumination.

That is, the light source device in the related art has a problem that it is difficult to satisfy the requirement of dark field illumination.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a light source device and scanning imaging equipment to there is the problem that is difficult to satisfy the requirement of dark field illumination in the light source device who solves among the prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided a light source device including: a frame; the circuit board is arranged in the frame; the light-emitting piece is arranged on the circuit board; the light guide piece, the light guide piece sets up in the light-emitting side of light-emitting piece, and the light guide piece includes incident surface, plane of reflection and emitting surface, and the plane of reflection is one or more, and the light of light-emitting piece transmission gets into the light guide piece by the incident surface, and through one or more reflection of one or more planes of reflection by the emitting surface outgoing, the shape of at least one in incident surface and the emitting surface is the cylinder.

Further, the shape of the incident surface includes one of a cylindrical surface, a flat surface, and a curved surface; and/or the shape of the exit surface comprises one of a cylindrical surface, a flat surface, and a curved surface.

Furthermore, the incident surface and the emergent surface are both cylindrical, the incident surface is arranged in a convex manner towards the light-emitting piece, and the emergent surface is arranged in a convex manner towards the light-emitting side of the light source device; and/or the central line of the incident surface and the central line of the emergent surface form an angle.

Furthermore, the light-emitting part comprises a plurality of LEDs which are arranged in a linear array; or a plurality of LEDs are arranged in an area array.

Furthermore, when the number of the reflecting surfaces is one, the incident surface, the reflecting surface and the exit surface are sequentially connected, an angle is formed between every two adjacent surfaces, and the reflecting surface is a plane and is a total reflection surface or a mirror surface.

Further, the light guide piece further comprises a connecting surface, the connecting surface is used for connecting the incident surface and the emergent surface, and the connecting surface and the reflecting surface are arranged correspondingly.

Furthermore, the central line of the incident surface and the central line of the emergent surface form an obtuse angle.

Furthermore, when the reflection face is a plurality of, a plurality of reflection faces include first reflection face and second reflection face, and the leaded light spare still includes the connection face, and incident face, first reflection face, connection face, second reflection face and outgoing surface are connected in order end to end, and are the angle between the two adjacent faces, and first reflection face and second reflection face are the plane, and the light that the incident face transmitted comes is emergent by the outgoing surface after the reflection of second reflection face and first reflection face in proper order.

Furthermore, the first reflecting surface and the second reflecting surface are both mirror surfaces, and an acute angle is formed between the first reflecting surface and the second reflecting surface.

Further, the light source device further includes: the frame is provided with a light outlet, the transparent plate is covered on the light outlet, and the transparent plate is positioned on the light outlet side of the light outlet surface; and/or the heat radiation structure, the heat radiation structure is set up on the frame, and locate at the backlight side of the light-emitting component, the heat radiation structure includes one kind in air-cooling fin and fan; and/or the optical filter is arranged on the frame and is positioned on the light-emitting side of the emergent surface.

According to another aspect of the utility model, a scanning imaging device is provided, include: an imaging device; in the light source device, the light source device is arranged on the periphery of the imaging device, the surface of the measured object of the scanning imaging device is positioned on the side of the light source device far away from the imaging device, and the light emitted by the light source device obliquely irradiates the surface of the measured object.

By applying the technical scheme of the utility model, the light source device comprises a frame, a circuit board, a light-emitting part and a light-guiding part, wherein the circuit board is arranged in the frame; the light emitting piece is arranged on the circuit board; the light guide member is arranged on the light outlet side of the light emitting member, the light guide member comprises an incident surface, a reflecting surface and an emergent surface, the reflecting surface is one or more, light rays emitted by the light emitting member enter the light guide member from the incident surface and are emitted from the emergent surface through one or more reflections of one or more reflecting surfaces, and at least one of the incident surface and the emergent surface is in a cylindrical surface shape.

Through setting up the frame for the frame provides installation space for circuit board, light-emitting component and leaded light spare, has formed the protection to circuit board, light-emitting component and leaded light spare simultaneously, has guaranteed the use reliability of circuit board, light-emitting component and leaded light spare, and then has guaranteed that light source device can the steady operation. The illuminating part is arranged on the circuit board so that the circuit board provides a circuit for the illuminating part, and the illuminating part is used for driving to light the illuminating part so as to ensure that the illuminating part can stably emit light. The light guide part is arranged on the light outlet side of the light emitting part and comprises an incident surface, a reflecting surface and an emergent surface, the reflecting surface is one or more, light rays emitted by the light emitting part enter the light guide part from the incident surface and are emitted from the emergent surface through one or more reflections of one or more reflecting surfaces, so that the light rays are turned while the light ray convergence effect is not influenced, the path trend of the light rays in the light guide part is effectively planned, the positions of other parts in the light source device are shifted, the sizes of the parts are not limited by the working positions of the light sources during dark field illumination, and the brightness during dark field illumination can be improved by replacing the large-size high-brightness light emitting part and other methods. Meanwhile, at least one of the incident surface and the emergent surface is in a cylindrical shape, so that the arrangement is favorable for the convergence effect of the incident surface on the light emitted by the luminous piece or the convergence emergent effect of the emergent surface on the light, and the use effect of the light guide piece is ensured. The utility model provides a light source device, through the special design of leaded light spare, solved the problem that traditional external light source is difficult to improve illumination brightness under dark field illumination uses, can satisfy the requirement of dark field illumination simultaneously to have advantages such as hi-lite, simple structure, expansibility are strong, miniaturization, with low costs.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows an exploded view of a light source device according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a scanning imaging apparatus employing the light source device of FIG. 1;

fig. 3 is a schematic structural diagram of a scanning imaging apparatus using a light source device according to a second embodiment.

Wherein the figures include the following reference numerals:

10. a frame; 20. a circuit board; 30. a light emitting member; 40. a light guide; 41. an incident surface; 421. a total reflection surface; 422. a first reflective surface; 423. a second reflective surface; 43. an exit surface; 44. a connecting surface; 45. an engagement face; 50. a transparent plate; 60. a linear array CIS camera; 70. the surface of the object to be measured.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional terms such as "upper, lower, top, bottom" generally refer to the orientation as shown in the drawings, or to the component itself being oriented in a vertical, perpendicular, or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that the light source device among the prior art has the requirement that is difficult to satisfy dark field illumination, the utility model provides a light source device and scanning imaging equipment.

As shown in fig. 1 to 3, the light source device includes a frame 10, a circuit board 20, a light emitting member 30, and a light guide member 40, the circuit board 20 being disposed within the frame 10; the light emitting member 30 is disposed on the circuit board 20; the light guide member 40 is disposed on the light emitting side of the light emitting member 30, the light guide member 40 includes one or more incident surfaces 41, one or more reflecting surfaces and one or more emitting surfaces 43, the light emitted from the light emitting member 30 enters the light guide member 40 through the incident surfaces 41, and is emitted from the emitting surfaces 43 through one or more reflections of the one or more reflecting surfaces, and at least one of the incident surfaces 41 and the emitting surfaces 43 is cylindrical.

Through setting up frame 10 for frame 10 provides installation space for circuit board 20, light-emitting component 30 and leaded light component 40, has formed the protection to circuit board 20, light-emitting component 30 and leaded light component 40 simultaneously, has guaranteed the use reliability of circuit board 20, light-emitting component 30 and leaded light component 40, and then has guaranteed that the light source device can stable operation. The light emitting member 30 is disposed on the circuit board 20, so that the circuit board 20 provides a circuit for the light emitting member 30, and the light emitting member 30 is used for driving and lighting the light emitting member 30, so as to ensure that the light emitting member 30 can stably emit light. The light guide member 40 is arranged on the light emitting side of the light emitting member 30, the light guide member 40 comprises an incident surface 41, a reflecting surface and an emitting surface 43, the number of the reflecting surfaces is one or more, light rays emitted by the light emitting member 30 enter the light guide member 40 from the incident surface 41 and are emitted from the emitting surface 43 through one or more reflections of the one or more reflecting surfaces, so that the light rays are turned while the light ray convergence effect is not influenced, the path trend of the light rays in the light guide member 40 is effectively planned, the positions of other components in the light source device are shifted, the sizes of the components are not limited by the working positions of the light source during dark field illumination, and the brightness during dark field illumination can be improved by replacing the large-size high-brightness light emitting member 30 and other methods. Meanwhile, at least one of the incident surface 41 and the emergent surface 43 is cylindrical, which is beneficial to the converging effect of the incident surface 41 on the light emitted by the light-emitting member 30 or the converging and emergent effect of the emergent surface 43 on the light, thereby ensuring the use effect of the light-guiding member 40. The utility model provides a light source device through the special design of leaded light spare 40, has solved the problem that traditional external light source is difficult to improve illumination brightness under dark field illumination uses, can satisfy the requirement of dark field illumination simultaneously to have advantages such as hi-lite, simple structure, expansibility are strong, miniaturization, with low costs.

It should be noted that the frame 10 is used for fixing and sealing the internal components of the light source device, the material of the frame 10 includes, but is not limited to, plastic and aluminum, and the surface of the frame 10 may be coated with black paint for absorbing stray light. The above-mentioned light turning, that is, the change of the propagation direction of the light, may be a change of the propagation angle of the light, or a shift of the propagation path of the light.

Specifically, the shape of the incident surface 41 includes one of a cylindrical surface, a flat surface, and a curved surface; the shape of the exit surface 43 includes one of a cylindrical surface, a flat surface, and a curved surface. In one embodiment of the present application, the incident surface 41 and the emitting surface 43 are both cylindrical, the incident surface 41 is disposed to protrude toward the light emitting member 30, and the emitting surface 43 is disposed to protrude toward the light emitting side of the light source device. The incident surface 41 is cylindrical, and the incident surface 41 is arranged to be convex toward the light-emitting member 30, so that divergent light rays emitted by the light-emitting member 30 are converted into parallel light through the incident surface 41 and enter the light-guiding member 40, most of the light rays emitted by the light-emitting member 30 can enter the light-guiding member 40, and the light-guiding member 40 can collect the light rays; the exit surface 43 is arranged to be a cylindrical surface, and the exit surface 43 is arranged to be convex to the light exit side of the light source device, so that the exit surface 43 is favorable for receiving the light reflected by the reflecting surface, the light is converged and emitted, and the brightness of the light source device is ensured.

It should be noted that, the central line of the incident surface 41 and the central line of the emergent surface 43 are disposed at an angle, and the angle between the central line of the incident surface 41 and the central line of the emergent surface 43 may be one of an acute angle, a right angle and an obtuse angle, and may be reasonably arranged according to the number and the position of the reflecting surfaces in the specific embodiment.

Specifically, the light emitting member 30 includes a plurality of LEDs, and the plurality of LEDs are arranged in a linear array, that is, the plurality of LEDs are arranged in sequence or at equal intervals along a straight line; or a plurality of LEDs are arranged in an area array. That is to say, the plurality of LEDs may be single-row LEDs arranged in a linear array, or multiple-row LEDs arranged in an area array, and may be arranged according to actual requirements.

Specifically, the light guide member 40 is made of a transparent material to ensure stable transmission of light therein, including but not limited to transparent plastic and glass; wherein, the light guide member 40 has one or more reflection surfaces, so that the light beam is reflected at the reflection surfaces; the light guide member 40 has an incident surface 41 and an exit surface 43, and the incident surface 41 and the exit surface 43 may be flat surfaces, cylindrical surfaces, or other curved structures that contribute to converging light rays. The reflecting surface of the light guide member 40 can be designed to be totally reflected by the light beam on the surface through an angle, or can be processed into a mirror surface through coating or film coating, so that the light beam is subjected to mirror reflection on the surface, thereby avoiding the loss of energy of the light beam in the reflecting process and further ensuring the brightness of the emergent light.

Specifically, the light source device further includes a transparent plate 50, the frame 10 has a light outlet, the transparent plate 50 is covered on the light outlet, and the transparent plate 50 is located on the light outlet side of the light outlet surface 43; through setting up transparent plate 50, transparent plate 50 is used for sealing the light source device internals for transparent plate 50 can realize the sealed normal light-emitting that can not influence the light source device simultaneously of frame 10, is favorable to guaranteeing the leakproofness of light source device. The transparent plate 50 is made of a material that transmits light well, and a typical material includes one of transparent plastic and glass.

Specifically, the light source device further includes a heat dissipation structure, the heat dissipation structure is disposed on the frame 10 and located on the backlight side of the light emitting element 30, and the heat dissipation structure includes one of a heat sink and a fan; through setting up heat radiation structure for heat radiation structure can assist circuit board 20 heat dissipation, and when heat radiation structure was the fin, can make the luminous heat that produces of light source device disappear fast through the fin, reaches quick radiating effect, also can adopt the fan to dispel the heat to light source device certainly.

Specifically, the light source device further includes a filter disposed on the frame 10 and located on the light exit side of the exit surface 43. The filter is used for limiting the wavelength range of the illumination light, the filter can be selectively arranged according to specific requirements, and the selection type of the filter can also be selected according to the required wavelength range of the illumination light.

The application also provides a scanning imaging device, which comprises an imaging device and the light source device, wherein the light source device is arranged on the peripheral side of the imaging device, the measured object surface 70 of the scanning imaging device is positioned on one side of the light source device, which is far away from the imaging device, and the light emitted by the light source device is obliquely irradiated on the measured object surface 70. The imaging device can be a linear array CIS camera 60, the problem that the traditional external light source of the linear array CIS camera 60 is difficult to improve the illumination brightness under dark field illumination application is effectively solved by arranging the light source device, so that the light source device can provide high-brightness illumination light for the linear array CIS camera 60, the use requirement of the linear array CIS camera 60 is met, the identification of scanning imaging equipment on a fine structure is facilitated, and the scanning precision is ensured.

The present application is described below in conjunction with specific embodiments and the attached drawings.

Example one

Fig. 1 is an exploded view of a light source device according to a first embodiment.

Fig. 2 is a schematic structural diagram of a scanning imaging apparatus using the light source device in fig. 1.

In this embodiment, the light guide member 40 of the light source device has one reflecting surface, the incident surface 41, the reflecting surface, and the exit surface 43 are connected in sequence, and the adjacent two surfaces form an angle therebetween, and the reflecting surface is a plane and is the total reflection surface 421. The incident surface 41 and the exit surface 43 are both cylindrical in shape. The light guide member 40 further includes a connecting surface 44, the connecting surface 44 is used for connecting the incident surface 41 and the exit surface 43, and the connecting surface 44 is disposed corresponding to the reflecting surface. That is, the incident surface 41, the reflecting surface, the emitting surface 43, and the connecting surface 44 of the light guide 40 are connected end to end in this order. The illumination light entering the light guide member 40 from the incident surface 41 is totally reflected once by the total reflection surface 421 to realize turning, so that the propagation direction of the light is deflected once, and thus the light source device is more suitable for dark field illumination of 10-13 degrees by the light emitting member 30 with large-size or multi-row LED arrays at a position of 25-30 mm away from the surface 70 of the measured object. The light emitted and diffused by the LED is converged into the light guide 40 by the incident surface 41 and reaches the reflecting surface, and the angle of the light incident on the reflecting surface satisfies the total reflection condition by the arrangement position of the reflecting surface, so that the light is totally reflected on the reflecting surface, the propagation direction of the light is changed, and the light is converged and emitted by the emitting surface 43 after being turned by the reflecting surface, and then emitted to the surface 70 of the object to be measured for illumination.

In the present embodiment, the plurality of LEDs includes one row.

In the present embodiment, the center line of the incident surface 41 and the center line of the exit surface 43 are arranged at an obtuse angle.

As shown in fig. 2, the light source device of the scanning imaging apparatus is disposed outside the line CIS camera 60 and on one side of the line CIS camera 60 to provide dark field illumination, and assist the line CIS camera 60 in scanning and imaging the surface 70 of the object to be measured. The line CIS camera 60 is used for dark field imaging in the present embodiment. The frame 10 is used to fix and seal the internal components of the light source device, and typical materials include one of plastic and aluminum. The circuit board 20 is used to drive the lighting LED. The light emitting element 30 is a plurality of LEDs fixed on the circuit board 20 in a linear array or an area array, and is used for providing illumination light, and in the embodiment, the wavelength of the illumination light may be any wavelength range that meets the imaging requirement. The light guide 40 is made of a transparent material, typically one of transparent plastic and glass, and the light guide 40 serves to collect and divert the illumination light.

The operation method of the light source device includes:

1) The components in the light source device are assembled, and the joint of the frame 10 and the transparent plate 50 is sealed, so that the interior has good sealing performance.

2) The light source device is fixed at one side of the linear array CIS camera 60, and the light source device is rotated so that the light emitting angle satisfies the dark field illumination condition.

3) The linear array CIS camera 60 is placed at a working distance above the surface 70 of the measured object, the power supply of the equipment is switched on, and the horizontal and vertical positions of the light source device are adjusted according to the pictures shot by the linear array CIS camera 60, so that the imaging effect is optimal. At this time, dark field imaging can be performed on the surface 70 of the object to be measured, and characters or fine structures on the surface 70 of the object to be measured can be clearly distinguished from the scanned image.

Example two

Fig. 3 is a schematic structural diagram of a scanning imaging apparatus using the light source device according to the second embodiment.

The difference between the present embodiment and the first embodiment is that the structure of the light guide member 40 is different. Specifically, the reflection surface of the light guide 40 includes a plurality of surfaces. The plurality of reflecting surfaces comprise a first reflecting surface 422 and a second reflecting surface 423, the light guide member 40 further comprises an engaging surface 45, the incident surface 41, the first reflecting surface 422, the engaging surface 45, the second reflecting surface 423 and the emergent surface 43 are sequentially connected end to end, an angle is formed between the two adjacent surfaces, the first reflecting surface 422 and the second reflecting surface 423 are both planes, and light rays transmitted by the incident surface 41 are sequentially reflected by the second reflecting surface 423 and the first reflecting surface 422 and then emitted by the emergent surface 43.

In the present embodiment, the angle between the center line of the incident surface 41 and the center line of the exit surface 43 is close to a right angle.

In this embodiment, the light emitted from the LED is converged by the incident surface 41 into the light guide 40 and reaches the second reflecting surface 423, and the light is deflected in the first light propagation direction by the second reflecting surface 423, then reaches the first reflecting surface 422, is deflected in the second light propagation direction by the first reflecting surface 422, is further transmitted to the exit surface 43, is converged by the exit surface 43, exits, and exits onto the surface 70 of the object to be measured for illumination. Specifically, first plane of reflection 422 and second plane of reflection 423 are the mirror surface through coating or tectorial membrane processing to cause the loss of light energy when avoiding first plane of reflection 422 and second plane of reflection 423 reflection light, be the acute angle setting between first plane of reflection 422 and the second plane of reflection 423, be provided with like this and do benefit to first plane of reflection 422 and receive the light that second plane of reflection 423 reflects, in order to guarantee the stability of light transmission in leaded light spare 40. The illumination light is subjected to two mirror reflection through the light guide part 40 to realize two steering, and the small-size LED array light source can be suitable for dark field illumination of 13-15 degrees at a position 20-25 mm away from the surface of a measured object.

The operation method of the light source device includes:

1) The components in the light source device are assembled, and the joint of the frame 10 and the transparent plate 50 is sealed, so that the interior has good sealing performance.

2) The light source device is fixed at one side of the linear array CIS camera 60, and the light source device is rotated so that the light emitting angle satisfies the dark field illumination condition.

3) The linear array CIS camera 60 is placed at a working distance above the surface 70 of the measured object, the power supply of the equipment is switched on, and the horizontal and vertical positions of the external light source device are adjusted according to the pictures shot by the linear array CIS camera 60, so that the imaging effect is optimal. At this time, dark field imaging can be performed on the object to be measured, and characters or fine structures on the surface 70 of the object to be measured can be clearly distinguished from the scanned image.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A light source device, comprising:

a frame (10);

a circuit board (20), the circuit board (20) being disposed within the frame (10);

a light emitting member (30), the light emitting member (30) being disposed on the circuit board (20);

light guide (40), light guide (40) set up the light-emitting side of light-emitting member (30), light guide (40) are including incident surface (41), plane of reflection and emitting surface (43), the plane of reflection is one or more, the light of light-emitting member (30) transmission by incident surface (41) gets into in light guide (40), through one or more the primary or multiple reflection of plane of reflection by emitting surface (43) outgoing, incident surface (41) with at least one's shape is the cylinder in emitting surface (43).

2. The light source device according to claim 1,

the shape of the incident surface (41) comprises one of a cylindrical surface, a plane surface and a curved surface; and/or

The shape of the exit surface (43) includes one of a cylindrical surface, a flat surface, and a curved surface.

3. The light source device according to claim 1,

the incident surface (41) and the emergent surface (43) are cylindrical, the incident surface (41) is arranged in a protruding manner towards the light-emitting piece (30), and the emergent surface (43) is arranged in a protruding manner towards the light-emitting side of the light source device; and/or

The center line of the incident surface (41) and the center line of the emergent surface (43) form an angle.

4. A light source device according to claim 1, characterized in that the light emitting member (30) comprises a plurality of LEDs,

the LEDs are arranged in a linear array; or alternatively

The plurality of LEDs are arranged in an area array.

5. The light source device according to claim 1, wherein when the reflecting surface is one, the incident surface (41), the reflecting surface and the exit surface (43) are connected in sequence, and form an angle therebetween, and the reflecting surface is a plane and is a total reflecting surface (421) or a mirror surface.

6. The light source device according to claim 5, wherein the light guide member (40) further comprises a connecting surface (44), the connecting surface (44) is used for connecting the incident surface (41) and the emergent surface (43), and the connecting surface (44) is arranged corresponding to the reflecting surface.

7. A light source device according to claim 5, characterized in that the centre line of the entrance face (41) and the centre line of the exit face (43) are arranged at an obtuse angle.

8. The light source device according to claim 1, wherein when the plurality of reflection surfaces are provided, the plurality of reflection surfaces include a first reflection surface (422) and a second reflection surface (423), the light guide member (40) further includes an engagement surface (45), the incident surface (41), the first reflection surface (422), the engagement surface (45), the second reflection surface (423) and the exit surface (43) are sequentially connected end to end, and an angle is formed between two adjacent surfaces, the first reflection surface (422) and the second reflection surface (423) are both planar, and the light transmitted from the incident surface (41) sequentially passes through the second reflection surface (423) and the first reflection surface (422) and then exits from the exit surface (43).

9. The light source device according to claim 8, wherein the first reflecting surface (422) and the second reflecting surface (423) are both mirror surfaces, and the first reflecting surface (422) and the second reflecting surface (423) are disposed at an acute angle.

10. The light source device according to any one of claims 1 to 9, further comprising:

the frame (10) is provided with a light outlet, the transparent plate (50) is covered on the light outlet, and the transparent plate (50) is positioned on the light outlet side of the light outlet surface (43); and/or

The heat dissipation structure is arranged on the frame (10) and positioned on the backlight side of the light emitting piece (30), and comprises one of a heat dissipation sheet and a fan; and/or

The optical filter is arranged on the frame (10) and is positioned on the light emitting side of the emergent surface (43).

11. A scanning imaging device, comprising:

an image forming device;

the light source device according to any one of claims 1 to 10, the light source device being disposed on a peripheral side of the imaging device, a measured object surface (70) of the scanning imaging apparatus being located on a side of the light source device away from the imaging device, the light emitted from the light source device being obliquely irradiated on the measured object surface (70).

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