CN216391135U - Light guide structure, light supplementing module and portable scanning device - Google Patents

Abstract

The embodiment of the utility model provides a light guide structure, a light supplementing module and portable scanning equipment, wherein the light guide structure is used for the portable scanning equipment and comprises a light guide piece, a light source and a light source module, wherein the light guide piece is used for guiding light irradiated by a light source to illuminate a target medium at the front side of the light supplementing module; the light guide part is provided with a light-transmitting plate part, and the light-transmitting plate part is used for being arranged between the camera and the target medium in the front-back direction so that the camera collects image information of the target medium through the light-transmitting plate part; the light-transmitting plate portion has a first reflecting surface for reflecting forward light emitted directly or indirectly from the light source to illuminate a target medium. Utilize first plane of reflection to reflect the light that the light source penetrated forward in order to illuminate the target medium for the printing opacity board forms the front light and throws light on, under the circumstances of guaranteeing to provide good illumination for the target medium, can effectively improve illumination uniformity, avoid appearing local facula and the condition that appears overexposure.

Description

Light guide structure, light supplementing module and portable scanning device

Technical Field

Embodiments of the present invention relate to the field of light emitting device technology. More particularly, embodiments of the present invention relate to a light guide structure, a light supplement module and a portable scanning device.

Background

This section is intended to provide a background or context to the embodiments of the utility model that are recited in the claims. The description herein may include concepts that could be pursued, but are not necessarily ones that have been previously conceived or pursued. Thus, unless otherwise indicated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section.

As a portable scanning device, a dictionary pen is an intelligent device that scans contents such as printing fonts and symbols into the pen to perform Optical Character Recognition (OCR), and implements a translation or interpretation function through built-in translation software.

Such portable scanning devices are equipped with a camera for capturing images at a relatively short distance (text on the target medium is considered as image information). Due to the product itself and the user's occlusion of ambient light, the image information on the acquisition target medium lacks sufficient ambient light illumination, often requiring supplemental illumination to obtain a sharp image. At present, a relatively common lighting mode is top light lighting, an LED light source is arranged beside a camera, the light source directly irradiates on a collection target medium, reflected light of the collection target medium is in a camera view field, and the camera scans image information on the corresponding collection target medium.

The above-described portable scanning device using top illumination has problems in particular use: for high-reflection media such as coated paper and display screens, when the high-reflection media are directly irradiated by using top light, the light source can generate obvious light spots on the high-reflection media, and the light spots can cause the local area of an image to be over-exposed, so that the scanning equipment cannot acquire accurate image information, and the application scene of the portable scanning equipment is influenced.

SUMMERY OF THE UTILITY MODEL

Known portable scanning devices using top direct illumination tend to form spots on highly reflective media, resulting in scanning devices that are unable to obtain accurate image information, which is a very annoying process.

Therefore, an improved light guide structure of the light supplementing module is very needed, so that the portable scanning device is not easy to generate light spots influencing scanning when being applied to a high-reflection medium, and the accuracy of acquiring image information by the portable scanning device is further improved to a certain extent.

In this context, embodiments of the present invention are intended to provide, in one aspect, a portable scanning device that can be adapted to different application scenarios (e.g., point-and-read, translation, etc.). Therefore, in another aspect, embodiments of the present invention further desire to provide a light supplement module for a portable scanning device and a light guide structure thereof, which can be used as a light supplement lighting device of the portable scanning device, and adopt a bottom-surface front lighting manner to supplement light for lighting, so as to effectively solve the problem of overexposure of an image caused by light spots of an existing light source, improve the performance of the portable scanning device in recognizing image information, and reduce the limitation of an application scene on the portable scanning device.

In a first aspect of embodiments of the present invention, a light guide structure for a light supplement module of a portable scanning device is provided, which includes a light guide for guiding light irradiated by a light source to illuminate a target medium in front of the light supplement module; the light guide part is provided with a light-transmitting plate part, and the light-transmitting plate part is arranged between a camera and the target medium in the front-back direction so that the camera collects image information of the target medium through the light-transmitting plate part; the light-transmitting plate part is provided with a first reflecting surface which is used for reflecting light directly or indirectly emitted by the light source to the front so as to illuminate the target medium.

The beneficial effects are that: in the light guide piece, the light directly or indirectly irradiated by the light source is reflected forwards by the first reflecting surface to illuminate the target medium, so that the light transmitting plate part forms front light illumination, the diffuse reflection can be formed on the target medium by the light reflected by the light transmitting plate part towards the target medium, the light reflected by the diffuse reflection reversely passes through the light transmitting plate part backwards to enter a camera market, and the camera can be effectively ensured to acquire image information of the target medium through the light transmitting plate part. The transparent plate part is equivalent to a front light surface light source, so that under the condition of providing good illumination for a target medium, the illumination uniformity can be effectively improved, the condition of overexposure caused by local light spots is avoided, the performance of identifying image information by using the portable scanning equipment with the light supplementing structure is improved, and the limitation of an application scene on the portable scanning equipment is reduced.

In one embodiment of the present invention, the light guide member has a second reflection surface disposed opposite to the first reflection surface, and the second reflection surface is configured to reflect light irradiated by the light source toward the light-transmitting plate portion, so that the first reflection surface reflects light emitted from the light source toward the target medium. Utilize the cooperation of first plane of reflection and second plane of reflection, can send the light source and hit on first plane of reflection through the reflection of second plane of reflection, hit on the target medium forward by first plane of reflection again, so, utilize the reflection of second plane of reflection, can make the light source keep away from the printing opacity board relatively and arrange, be convenient for arrange corresponding light source, make things convenient for manufacturing according to portable scanning equipment's actual structure.

In one embodiment of the present invention, the light guide member has a light guide plate portion extending in the front-rear direction, the light guide plate portion has an irradiation side surface for irradiation by the light source, and the light guide plate portion is located on the rear side of the second reflection surface in the front-rear direction to guide the light emitted from the light source forward to the second reflection surface.

In another embodiment of the present invention, a front end of the light guide plate portion is adjacent to the second reflection surface, and the irradiation side surface is located at a rear end of the light guide plate portion.

In still another embodiment of the present invention, the irradiation side surface has one or more diffusion recesses into which the light source is sunk to diffuse light emitted from the light source into the light guide plate part.

In yet another embodiment of the present invention, the diffusing recess is an arc-shaped recess, a U-shaped recess, or a V-shaped recess.

In one embodiment of the utility model, the light-transmitting plate portion is a wedge-shaped plate portion, a front side surface of the wedge-shaped plate portion forms a front light irradiation surface facing the target medium, a rear side surface of the wedge-shaped plate portion forms the first reflection surface, and a front-back thickness of a side of the wedge-shaped plate portion close to the second reflection surface is larger than a front-back thickness of a side of the wedge-shaped plate portion far from the second reflection surface.

In yet another embodiment of the present invention, the front light irradiation surface is adjacent to the second reflection surface.

In another embodiment of the present invention, the front end of the light guide plate portion and the rear end of the light transmitting plate portion are connected in a bending transition manner.

In an embodiment of the utility model, the light-transmitting plate portion and the light-guiding plate portion cooperate to form a bending structure extending along a set direction, two ends of the light-guiding member in the extending direction of the bending structure are respectively provided with a light-transmitting fence portion, the light-guiding plate portion and the light-transmitting plate portion enclose a recessed structure, and a rear side of the recessed structure facing the camera is an open structure.

In another embodiment of the present invention, the light guide member is an integrally formed transparent polycarbonate member or transparent acrylic member.

In yet another embodiment of the present invention, the inner side surface of the light guide plate portion facing the recessed structure and the outer side surface facing away from the recessed structure are respectively provided with a reflective sheet.

In another embodiment of the present invention, the light guide member has a reflection plane forming the second reflection surface, and a reflection sheet is disposed on a side of the reflection plane facing away from the first reflection surface.

In yet another embodiment of the present invention, the first reflecting surface is a total reflecting surface.

In another embodiment of the present invention, the light-transmitting plate portion is a wedge-shaped plate portion having a rear side surface in a front-rear direction forming the first reflecting surface and a front side surface forming a front light irradiation surface facing the target medium, the wedge-shaped plate portion has a first end and a second end distributed in a direction in which a plate thickness gradually decreases, the first end having a plate thickness in the front-rear direction larger than the second end, the first end of the light-transmitting plate portion has an irradiation side surface for irradiation by the light source, the irradiation side surface being arranged opposite to the first reflecting surface for reflecting light directly emitted from the light source forward to illuminate the target medium.

In a second aspect of the embodiments of the present invention, a light supplementing module for a portable scanning device is provided, which includes a light guiding structure and a light source for illuminating the light guiding structure, wherein the light guiding structure is the light guiding structure of the light supplementing module for the portable scanning device according to any one of the first aspect of the present invention.

In a third aspect of the embodiments of the present invention, a portable scanning device is provided, which includes a camera for acquiring image information of a front target medium and a light supplement module for illuminating the target medium forward, where the light supplement module in the second aspect of the present invention is adopted as the light supplement module, and the camera is located at a rear side of a light transmissive plate portion of the light supplement module to acquire the image information of the target medium through the light transmissive plate portion.

In another embodiment, the portable scanning device includes a housing extending in a front-rear direction, and the light guide member in the light supplement module is slidably guided and movably mounted in the housing in the front-rear direction as a start switch of the portable scanning device.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the utility model are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

fig. 1 schematically shows a schematic diagram of a camera and a light supplement module suitable for implementing an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1 (with arrows indicating partial light directions);

FIG. 3 is another angle view of FIG. 1 (the light guide is shown in a half-sectional view, with arrows indicating the direction of partial light);

FIG. 4 schematically illustrates another light source and light guide assembly suitable for implementing embodiments of the present invention.

Description of reference numerals:

in fig. 1 to 3: 1. a camera; 2. a light source; 3. a light guide; 4. diffusing and recessing; 5. a light guide plate section; 51. irradiating the side; 52. an outer side surface; 53. an inner side surface; 6. a light-transmitting plate section; 61. a first reflective surface; 62. a front light irradiation surface; 7. a light-transmitting fence portion; 8. a second reflective surface.

In fig. 4: 1. a camera; 2. a light source; 6. a light-transmitting plate section; 61. a first reflective surface; 62. a front light irradiation surface; 11. a light shield; 51. the side is illuminated.

Detailed Description

The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the utility model, and are not intended to limit the scope of the utility model in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Summary of the utility model

The applicant has found that portable scanning devices lack sufficient ambient light illumination when capturing image information on a target medium due to the product itself and the user's obstruction of ambient light, requiring additional illumination to obtain a sharp image. When a top illumination mode is adopted, light spots are easy to appear when a light source is used for directly illuminating a high-reflection medium, and overexposure is caused, so that image information on a target medium cannot be accurately acquired.

Based on the above problem, the inventor adopts the reflection mode to guide the light that the light source shines to the printing opacity board of leaded light spare bottom to illuminate the target medium forward, simultaneously, utilize the printing opacity board to guarantee that the target medium takes place the diffuse reflection back reflected light and can pass the printing opacity board in order to get into the visual field of camera, guarantee that the camera can normally gather the image information of target medium. That is to say, under the condition of normally gathering image information, the printing opacity board portion of leaded light bottom is in between camera and the target medium in order to form the front light illumination, effectively improves and shines the homogeneity under the condition of illuminating the target medium, can acquire the image information that the quality is high, effectively solves the image overexposure that present common top illumination appears on the high reflection of light medium, the poor problem of homogeneity, improves portable scanning equipment identification image information's performance, reduces the restriction of using the scene to portable scanning equipment.

Having described the general principles of the utility model, various non-limiting embodiments of the utility model are described in detail below. According to an embodiment of the utility model, a light emitting module and a portable scanning device are provided. Moreover, any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.

The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the utility model.

Exemplary device

A portable scanning device according to an exemplary embodiment of the present invention will be described with reference to fig. 1 to 4.

In a first aspect of the present invention, a light guiding structure of a light supplement module for a portable scanning device is provided, which can be used in a portable scanning device to form a light supplement module by cooperating with a light source 2. When the portable scanning device is used, the light supplement is realized by illuminating a target medium, so that the camera 1 in the portable scanning device can acquire clear image information under the condition that a user shelters ambient light.

As shown in fig. 1 to 3, the light guide structure specifically includes a light guide member 3, and the light guide member 3 is used for guiding the light emitted from the light source 2 to illuminate the target medium at the front side of the light supplement module. It should be explained that, the front-back direction herein mainly corresponds to the target medium and the portable scanning device, and when in use, the target medium is located at the front side of the portable scanning device, and the light supplement module of the portable scanning device illuminates the target medium forward, that is, the target medium is located at the front side of the light supplement module.

The light guide member 3 is specifically an integrally formed transparent polycarbonate member, which is formed by processing a transparent polycarbonate material, and has a good transmittance so as to effectively guide light emitted from a light source to a target medium.

Considering that the light guide member 3 has a high light transmittance, in some embodiments, the light guide member may also be an integrally formed acrylic transparent member, and is specifically formed by processing a transparent acrylic material, so as to ensure that the transmittance meets the requirement.

According to some embodiments of the present invention, to facilitate description of the structure of the light guide member, first, opposite directions are defined on the light guide member, the light guide member has a first direction, a second direction and a third direction, the three directions are perpendicular to each other two by two to form a three-coordinate system, that is, the first direction and the second direction are perpendicular to each other, and the first direction and the second direction are both perpendicular to the third direction, where the third direction is the front-back direction in the above. The first direction, the second direction and the third direction can be seen in fig. 1 to 3.

In some embodiments, as shown in fig. 1-3, the light guide 3 has a second reflective surface 8 and a light transmissive plate portion 6. The second reflecting surface 8 here serves to reflect light irradiated thereon by the light source toward the light-transmitting plate portion 6. The light-transmitting plate portion 6 is disposed between the camera 1 and the target medium in the front-rear direction, so that the camera 1 collects image information of the target medium through the light-transmitting plate portion 6, that is, light reflected by the target medium enters the field of view of the camera 1 through the light-transmitting plate portion. And, the light-transmitting plate portion 6 should have a first reflecting surface 61, and the first reflecting surface 61 is arranged opposite to the second reflecting surface 8 so as to reflect the light emitted from the second reflecting surface 8 forward to illuminate the corresponding target medium, and at this time, the first reflecting surface 61 can be understood as an exit reflecting surface of the surface light source. The first reflecting surface and the second reflecting surface are all total reflecting surfaces, so that light rays are transmitted according to a set reflecting path as much as possible, and the illumination effect is improved. And when the second reflecting surface is a total reflecting surface, partial light reflected from the first reflecting surface can be effectively prevented from being refracted to enter the camera visual field.

When the light source is used, light emitted by the light source 2 strikes the second reflecting surface 8, part of the light forms total reflection and then continuously propagates to the first reflecting surface 61 in the light guide member 3, and under the reflection action of the first reflecting surface 61, part of the light is reflected to a target medium on the front side due to the total reflection, so that the target medium is illuminated. The light reflected by the target medium can enter the field of view of the camera 1 after passing through the light-transmitting plate part 6 backwards, and the camera 1 collects the image information on the target medium normally. By utilizing the matching of the second reflecting surface 8 and the first reflecting surface 61, the problem that light spots are easy to generate due to direct irradiation is avoided on the premise that light is transmitted to a target medium. Furthermore, the first reflecting surface 61 makes it easy to form a surface light source in the light transmitting plate portion 6, and thus, the luminance and uniformity of illumination can be effectively improved, and the occurrence of light spots due to overexposure is also less likely.

The front portion of the light guide member 3 is provided with a reflection plane, which is actually an outer side surface of the light guide member 3, so that a transition between an optically dense medium and an optically sparse medium is formed at the reflection plane, the optically dense medium is the light guide member 3, the optically sparse medium can be considered as air, when the light of the light source 2 irradiates on the support plane at a proper angle (for example, the incident angle is larger than the corresponding critical angle), total reflection can occur at the support plane, so that the support plane forms the second reflection surface 8, and most of the light is still transmitted in the light guide member 3.

The second reflecting surface 8 is for totally reflecting the light toward the first reflecting surface 61. Actually, in order to increase the reflectivity, in another embodiment, a reflective sheet may be attached to a side surface of the reflective plane of the light guide 3 facing away from the first reflective surface 61, where the side surface of the reflective plane facing away from the first reflective surface 61 is a side surface facing the optically thinner medium.

In some embodiments, the first reflective surface and the second reflective surface are both designed as fully reflective surfaces. In other embodiments, the first reflective surface may be designed as a total reflective surface, and the second reflective surface may reflect as much light as possible toward the first reflective surface. In fact, if the angle is designed so that the light reflected by the first reflecting surface will not enter the camera field of view even though the light is refracted at the second reflecting surface, the first reflecting surface is not required to be a total reflecting surface, and of course, the illumination effect at this time will be relatively poor.

In some embodiments, as shown in fig. 1 to 3, the light guide member 3 extends entirely in the front-back direction, the light guide member 3 integrally formed has a light guide plate portion 5, a light-transmitting plate portion 6 and light-transmitting fence portions 7 at two ends, the light guide plate portion 5 extends in the front-back direction, the light-transmitting plate portion 6 is located at the front side of the light guide plate portion 5, the light-transmitting plate portion 6 is arranged to be bent relative to the light guide plate portion 5 in the first direction, and the light-transmitting fence portions 7 are correspondingly located at two ends of the light guide member 3 in the second direction. Thus, as shown in fig. 1, the light-transmitting enclosure portion 7, the light guide plate portion 5, and the light-transmitting plate portion 6 on both sides enclose a recessed structure, and the rear side of the recessed structure for facing the corresponding camera 1 is an open structure.

The light guide plate portion 5 is specifically an equal-thickness plate portion extending in the front-rear direction, the light guide plate portion 5 has an irradiation side surface 51 for irradiation by the light source, as shown in fig. 3, the light guide plate portion 5 is located at the rear side of the second reflection surface 8 in the front-rear direction, the light emitted by the light source 2 is diffused into the light guide plate, and the light emitted by the light source 2 is guided forward onto the second reflection surface 8 under the guidance of the light guide plate portion 5.

As other embodiments, the thickness of the light guide plate portion in the first direction may be tapered forward in the front-rear direction, or may be other shapes, and the light guide plate portion may be used to guide the light to the second reflective surface on the front side.

In some embodiments, as shown in fig. 3, the front end of the light guide plate portion 5 is adjacent to the supporting plane forming the second reflecting surface 8, so that the length of the light guide member 3 in the front-back direction can be relatively reduced on the basis of facilitating the processing and molding, thereby facilitating the miniaturization design of the light guide member 3.

In other embodiments, the front end of the light guide plate portion may also be spaced from the second reflection surface by a predetermined distance, and at this time, the light guide member may be formed by fixing and assembling different members together, and no longer using an integrated structure.

In some embodiments, as shown in fig. 1 to 3, the rear end of the light guide plate portion 5 is provided with an illumination side surface 51 for illuminating the light source 2, the light guide plate portion 5 is located at the rear side of the second reflection surface 8 in the front-rear direction, and the light of the light source 2 is guided forward to the second reflection surface 8 by the light guide plate portion 5 in the front-rear direction.

In order to facilitate the light source 2 to diffuse into the light guide plate portion 5, three diffusion recesses 4 are arranged on the irradiation side surface 51, each diffusion recess 4 is an arc-shaped recess, each arc-shaped recess is correspondingly provided with one light source 2, such as an LED point light source 2, and when the LED light source device is used, the light source 2 sinks into the corresponding arc-shaped recess, so that the light emitted by the light source 2 diffuses into the light guide plate portion 5.

Of course, in other embodiments, the arc-shaped diffusion recess may be a major arc or a minor arc or a semicircle, and may also extend along a partially smooth parabola to ensure normal diffusion of light. The diffusion recesses 4 may also be U-shaped recesses or V-shaped recesses, and more than two U-shaped recesses or V-shaped recesses may be sequentially and laterally distributed at intervals along the horizontal direction in fig. 2, so as to allow the corresponding LED light sources to be sunk into and arranged.

In other embodiments, only one diffusion recess may be disposed on the illumination side, in which case the diffusion recess may extend along the horizontal direction in fig. 2, and the diffusion recess may be a V-shaped recess, in which case the light source may be a linear light source.

In addition, the number of the diffusion recesses 4 may be arranged according to actual needs, such as the type, number, and size of the light source, taking into consideration the entire thickness and width of the light guide plate portion (in this case, the length of the light guide plate portion 5 is extended in the front-rear direction).

In addition, in the above-described embodiment, the light source 2 is arranged at the rear end of the light guide plate so that the irradiation side surface 51 is located at the rear end of the light guide plate portion 5. In other embodiments, the light source 2 may be disposed beside the light guide plate, for example, laterally along the horizontal direction shown in fig. 2, and a reflective sheet is attached to the rear end surface of the light guide plate portion 5, so that the light entering the light guide plate portion 5 is emitted downward to the second reflective surface 8.

In fact, in some embodiments, to improve the illumination effect, the inner side surface 53 facing the concave structure and the outer side surface 52 facing away from the concave structure of the light guide plate portion 5 are respectively provided with a reflective sheet, where the concave structure is enclosed by the light-transmitting enclosure portion 7, the light guide plate portion 5 and the light-transmitting plate portion 6. By arranging the reflective sheet on the inner side surface 53 and the outer side surface 52 of the light guide plate part 5, referring to the inner side surface 53 and the outer side surface 52 in fig. 3, light emitted by the back side light source 2 can be shielded, and then light can be effectively guided to the second reflective surface 8, so that a better lighting effect can be obtained under the condition that the power of the light source 2 is not increased.

As shown in fig. 3, in some embodiments, the front end of the light guide plate portion 5 and the rear end of the light guide plate portion 6 are bent and transition-connected, so that the light guide plate portion 6 and the light guide plate portion 5 cooperate to form a bent structure extending along a set direction, where the set direction is the second direction in the above, that is, the width direction of the light guide plate portion 5 (the length direction of the light guide plate portion 5 is the front-back direction, that is, the third direction, and the thickness direction of the light guide plate portion 5 is the first direction).

The front side surface of the light-transmitting plate portion 6 in the front-rear direction here forms a front light irradiation surface 62 facing the target medium, and the front light irradiation surface 62 and the first reflection surface 61 cooperate to form a wedge-shaped structure having a larger front-rear thickness on the side close to the second reflection surface 8 than on the side away from the second reflection surface 8. In the embodiment shown in fig. 3, the light-transmitting plate portion 6 is embodied as a wedge-shaped plate portion, the front side surface of which forms the above-described front light irradiation surface 62, and the rear side surface of which in the front-rear direction forms the corresponding first reflection surface 61, so as to form the above-described wedge-shaped structure.

In some embodiments, as shown in fig. 3, the front light irradiation surface 62 on the front side of the light-transmitting plate portion 6 is adjacent to the second reflection surface 8, so that the size of the light guide member 3 in the second direction, i.e., the thickness direction of the light guide plate portion 5, is relatively small, without increasing the size of the light guide member 3 additionally.

In some embodiments, since the front end of the light guide plate portion 5 and the rear end of the light guide plate portion 6 are bent and transitional connected, so that the light guide plate portion 6 and the light guide plate portion 5 cooperate to form a bent structure extending along a set direction, as shown in fig. 3, the light guide plate portion 6 is bent relative to the light guide plate portion 5 in a first direction (i.e., the thickness direction of the light guide plate portion 5), and the formed bent structure extends along a second direction (i.e., the width direction of the light guide plate portion 5) as a whole. The two ends of the light guide member 3 in the extending direction of the bending structure are respectively provided with a light-transmitting fence portion 7, the light guide plate portion 5 and the light-transmitting plate portion 6 enclose a corresponding recessed structure, and the rear side of the recessed structure, which is used for facing the camera 1, is an open structure.

In other embodiments, the light-transmitting enclosure portions 7 on both sides may be omitted, and only the light guide plate portion 5 and the light-transmitting plate portion 6 may be disposed, and the two portions cooperate to form a similar L-shaped structure.

In some embodiments, the light source illuminates the light guide in the manner shown in fig. 1-3, and the first reflective surface on the light transmissive plate portion may actually reflect light emitted from the light source forward to illuminate the corresponding target medium. In other embodiments, as shown in fig. 4, one end of the light-transmitting plate of the light-guiding member is directly disposed on the irradiation side surface, so that the light emitted from the light source is directly emitted onto the first reflection surface of the light-transmitting plate, and in this case, the first reflection surface is used for reflecting the light directly emitted from the light source forward to illuminate the target medium. Specifically, the light-transmitting plate portion 6 in fig. 4 is specifically a wedge-shaped plate portion, and the rear side surface of the wedge-shaped plate portion 6 in the front-rear direction forms the corresponding first reflection surface 61, and the front side surface of the wedge-shaped plate portion 6 forms the front light irradiation surface 62 facing the target medium. The wedge plate portion 6 itself has a first end and a second end distributed in a direction in which the plate thickness gradually decreases, wherein the plate thickness of the first end in the front-rear direction is larger than the plate thickness of the second end in the front-rear direction. The first end of the light-transmitting plate portion has an irradiation side surface 51 for irradiation by the light source 2. In use, as shown in fig. 4, the light source 2 is disposed corresponding to the irradiation side surface 51, and the irradiation side surface 51 is disposed opposite to the first reflection surface 61, and is used for reflecting the light directly emitted from the light source forward to illuminate the target medium. Of course, the first reflective surface here may be a total reflective surface. The light reflected by the first reflecting surface 61 passes through the front light irradiating surface 62 forwards and then irradiates on the target medium on the front side, the diffuse reflection is generated on the surface of the target medium, the diffusely reflected light enters the transparent plate part again backwards and passes through the transparent plate part 6 backwards, and enters the visual field of the camera 1, and the camera 1 collects the image information on the target medium.

In the embodiment shown in fig. 4, in order to improve the utilization rate of the light source 2, a light shield 11 may be disposed outside the light source 2, so as to improve the illumination intensity and prevent the light from being directly irradiated on the target medium due to the overflow.

Comparing the embodiment shown in fig. 4 with the embodiment shown in fig. 3, in the case that the light sources are the same, the embodiment shown in fig. 4 has less loss and better illumination brightness because the light path is relatively short. However, for portable scanning devices, the closer to the target medium the smaller the size, the less convenient it is to mount the light source. Of course, the light source can be installed on the light guide member according to actual needs, and the light source can be installed on the shell of the portable scanning device according to actual needs.

In a light supplement module according to a second aspect of the present invention, as shown in fig. 1 to 3, the light supplement module may be applied to a portable scanning device to illuminate a target medium, and the light supplement module specifically includes a light source 2 and a light guide structure, where the light guide structure may adopt the light guide structure in the light supplement module, and is not described herein, and the light source 2 illuminates the light guide structure to form a front light surface to illuminate the target medium.

In other embodiments, as shown in fig. 4, the light supplement module may also be arranged such that the light source 2 is directly disposed beside the light transmissive plate portion 6, and light emitted from the light source is directly emitted to the first reflective surface.

In some embodiments, the light guide member 3 and the light source 2 in the light supplement module can be relatively and fixedly assembled together. In other embodiments, the light guide member 3 and the light source 2 may be separately disposed, if the light guide member 3 is used as a movable member, the light source 2 may be designed as a fixed member, and when the light guide member 3 moves relative to the light source 2, the positions and distances of the light source 2 and the light guide member 3 need to be designed with attention to avoid affecting the light source 2.

In a third aspect of the present invention, a portable scanning device includes a housing, and a camera 1 and a light supplement module are disposed in the housing, as shown in fig. 1 to 4, the camera 1 is configured to collect image information of a target medium, the light supplement module is configured to illuminate the target medium, the light supplement module includes a light source 2 and a light guide structure, and the light guide structure in the light supplement module may be adopted as the light guide structure, which is not described herein again. The light source 2 illuminates the light guiding structure to form a front light source from the light guiding structure to illuminate the target medium. During the use, camera 1 and target medium distribute in the front and back both sides of leaded light 3 for leaded light 3 forms the front lighting mode in bottom, and target medium reverberation passes behind printing opacity board 6 and gets into the visual field of camera 1 in, is normally shot by camera 1 and gathers the image information on the target medium.

In some embodiments, when the housing of the portable scanning device extends in the front-back direction, the light guide 3 in the light supplement module can be slidably guided and moved in the front-back direction to be assembled in the housing, and at this time, the light guide 3 can be used as a start switch of the portable scanning device through a circuit design. For example, when the portable scanning device is a dictionary pen, the housing can be pressed towards the target medium, the front light irradiation surface 62 of the light-transmitting plate part 6 of the guide member touches the target medium, and the light-guiding member 3 slides inwards to trigger a corresponding switch to control the power on and the operation of the camera 1. When a user operates the portable scanning device to leave a target medium, the light guide part 3 slides out outwards to reset under the action of the reset elastic part, the power supply can be controlled to be turned off, the camera 1 stops working, and energy-saving control is achieved.

The portable scanning device such as a dictionary pen, a touch and talk pen or other devices which are convenient to carry and can be scanned by illumination is only described in the utility model, and the portable scanning device in the scheme of the utility model also has the basic structure and the functions of other related electronic devices in the market. For example, the portable scanning device may also be provided with a main switch, a display structure (e.g., a display screen), a power supply structure (e.g., a battery, a charging interface, etc.), a sound output structure (e.g., a speaker), and the like.

It should be noted that although in the above detailed description several means or sub-means of the portable scanning device are mentioned, this division is only not mandatory. Indeed, the features and functions of two or more of the devices described above may be embodied in one device, according to embodiments of the utility model. Conversely, the features and functions of one apparatus described above may be further divided into embodiments by a plurality of apparatuses.

Use of the verbs "comprise", "comprise" and their conjugations in this application does not exclude the presence of elements or steps other than those stated in this application. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

While the spirit and principles of the utility model have been described with reference to several particular embodiments, it is to be understood that the utility model is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in such aspects may not be combined to benefit. The utility model is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (18)

1. A light guide structure of a light supplementing module for portable scanning equipment is characterized by comprising a light guide piece, a light source and a light guide piece, wherein the light guide piece is used for guiding light irradiated by the light source to illuminate a target medium at the front side of the light supplementing module;

the light guide part is provided with a light-transmitting plate part, and the light-transmitting plate part is arranged between a camera and the target medium in the front-back direction so that the camera collects image information of the target medium through the light-transmitting plate part;

the light-transmitting plate part is provided with a first reflecting surface which is used for reflecting light directly or indirectly emitted by the light source to the front so as to illuminate the target medium.

2. The light guide structure of the light supplementing module for the portable scanning device of claim 1, wherein the light guide member has a second reflecting surface disposed opposite to the first reflecting surface, and the second reflecting surface is configured to reflect the light irradiated by the light source to the light transmitting plate portion, so that the first reflecting surface reflects the light emitted from the light source to the target medium.

3. The light guide structure of the light supplementing module for the portable scanning apparatus according to claim 2, wherein the light guide member has a light guide plate portion extending in a front-rear direction, the light guide plate portion having an irradiation side surface for irradiation by the light source, the light guide plate portion being located at a rear side of the second reflecting surface in the front-rear direction to guide the light emitted from the light source to the second reflecting surface in a front-front direction.

4. A light guide structure of a light supplementing module for a portable scanning device as claimed in claim 3, wherein the front end of the light guide plate portion is adjacent to the second reflecting surface, and the illumination side surface is located at the rear end of the light guide plate portion.

5. A light guide structure of a light supplementing module for a portable scanning apparatus according to claim 3, wherein the irradiation side surface has one or more diffusion recesses into which the light source is sunk to diffuse the light emitted from the light source into the light guide plate.

6. The light guide structure of the light supplementing module for the portable scanning device according to claim 5, wherein the diffusion recess is an arc recess, a U-shaped recess or a V-shaped recess.

7. The light guide structure of the light supplementing module for the portable scanning device according to any one of claims 2 to 6, wherein the light transmissive plate is a wedge-shaped plate, a front side surface of the wedge-shaped plate forms a front light irradiation surface facing the target medium, a rear side surface of the wedge-shaped plate forms the first reflection surface, and a front-back thickness of a side of the wedge-shaped plate close to the second reflection surface is greater than a front-back thickness of a side of the wedge-shaped plate far from the second reflection surface.

8. The light guide structure of the light supplementing module for the portable scanning device of claim 7, wherein the front light emitting surface is adjacent to the second reflecting surface.

9. The light guide structure of the light supplementing module for the portable scanning device according to any one of claims 3 to 6, wherein a front end of the light guide plate portion and a rear end of the light transmitting plate portion are bent and transitional connected.

10. The light guide structure of the light supplement module for the portable scanning device of claim 9, wherein the light transmissive plate and the light transmissive plate cooperate to form a bending structure extending along a predetermined direction, two ends of the light guide member in the extending direction of the bending structure are respectively provided with a light transmissive enclosure portion, the light transmissive plate and the light transmissive plate enclose a recessed structure, and a rear side of the recessed structure facing the camera is an open structure.

11. The light guide structure of the light supplementing module according to claim 10, wherein the light guide member is an integrally formed polycarbonate transparent member or an acrylic transparent member.

12. The light guide structure of the light supplementing module for the portable scanning device according to claim 10, wherein a reflective sheet is disposed on an inner side of the light guide plate portion facing the recessed structure and an outer side of the light guide plate portion facing away from the recessed structure.

13. The light guide structure of the light supplementing module for the portable scanning device according to any one of claims 2 to 6, wherein the light guide member has a reflection plane forming the second reflection surface, and a reflection sheet is disposed on a side of the reflection plane facing away from the first reflection surface.

14. The light guide structure of the light supplementing module for the portable scanning device according to any one of claims 1 to 6, wherein the first reflective surface is a total reflective surface.

15. The light guide structure of the light supplement module for the portable scanning apparatus according to claim 1, wherein the light transmissive plate portion is a wedge-shaped plate portion having a rear side surface in a front-rear direction forming the first reflection surface and a front side surface forming a front light irradiation surface facing the target medium, the wedge-shaped plate portion has a first end and a second end distributed in a direction in which a plate thickness is gradually reduced, the plate thickness of the first end in the front-rear direction is larger than the plate thickness of the second end in the front-rear direction, and the first end of the light transmissive plate portion has an irradiation side surface for the light source to irradiate, and the irradiation side surface is arranged with respect to the first reflection surface, for reflecting forward the light directly irradiated from the light source to illuminate the target medium.

16. A light supplementing module for a portable scanning device, comprising a light guiding structure and a light source for illuminating the light guiding structure, wherein the light guiding structure is the light guiding structure of the light supplementing module for a portable scanning device according to any one of claims 1 to 15.

17. A portable scanning device, comprising a camera for collecting image information of a front target medium and a light supplement module for illuminating the target medium forward, wherein the light supplement module is the one according to claim 16, and the camera is located at the rear side of a light-transmitting plate of the light supplement module so as to collect the image information of the target medium through the light-transmitting plate.

18. The portable scanning device of claim 17, wherein the portable scanning device comprises a housing extending in a front-back direction, and the light guide member of the light supplement module is slidably guided and movably mounted in the housing in the front-back direction as an activation switch of the portable scanning device.

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