CN201022217Y - Scanning device with heat radiation structure - Google Patents

Abstract

The utility model discloses a scanning device with heat radiation structure contains a casing, an upper cover, a luminescence unit and an image sensing module. An opening is formed on the top surface of the shell, and an accommodating space is formed inside the shell. The upper cover covers the opening of the shell, wherein the upper cover is provided with a slot, a heat dissipation part and a bearing part connected with the heat dissipation part, and the bearing part extends to one side of the slot of the upper cover and extends to the accommodating space. The light-emitting unit is fixed on the bearing part and used for generating scanning light to pass through the slot, so that the scanning light is reflected by the document to form image light, and the image light is received by the image sensing module and converted into image data. The heat dissipation part is made of heat conducting materials and can exchange heat with air, so that heat generated by the light emitting unit can be transferred to the heat dissipation part through heat conduction and dissipated outwards, and the working temperature of the light emitting unit is maintained.

Description

Scanning device with heat dissipation structure

technical field

The utility model relates to a scanning device, in particular to a scanning device with a heat dissipation structure.

Background technique

The main components of the scanning device include a casing, a light emitting element and an image sensing module. The light-emitting element and the image sensing module are arranged in the casing, wherein the light-emitting element is used to generate scanning light, and the scanning light falls on the surface of the document through a slot of the casing. The scanning light is reflected by the surface of the document to form image light, which is then received by the image sensing module and converted into image data.

Traditionally, cold-cathode tubes are mostly used as light-emitting elements to obtain a light source with uniform light intensity distribution and provide ideal white light. However, since the operating voltage and initial start-up voltage of the cold-cathode tube are too high, the scanning device must have a rectifier circuit to provide a high voltage to drive the cold-cathode tube, which increases the cost of the scanning device. Secondly, after the cold-cathode tube is turned on, it must wait for a period of time before the emitted light intensity tends to stabilize. That is to say, the scanning device using the cold-cathode tube must wait for a period of time to warm up before it can be operated. In addition, the luminous intensity of cold cathode tubes is greatly affected by temperature. If the temperature of the cold cathode tube increases after the continuous operation of the scanning device, the intensity of the light emitted by it will also change, and even the frequency spectrum will shift, so that the emitted light is no longer ideal white light, resulting in inconsistent image scanning quality under continuous operation of the scanning device .

At present, light emitting diodes have been widely used to provide scanning light. Through the arrangement of light emitting diode arrays, the light emitting diodes can generate scanning light with uniform and good light intensity distribution. At the same time, light-emitting diodes are not limited to white LEDs that can emit ideal white light. For example, red, green, blue and other monochromatic scanning lights can also be synthesized into ideal white light after mixing.

However, light-emitting diodes have a characteristic of high heat generation, so that the use of light-emitting diodes is limited. The high heat generated by the light-emitting diodes will affect the components in the scanning device, making the scanning device unable to operate normally. Take the influence of the light-emitting diode itself as an example. When the temperature of the light-emitting diode rises to a certain level, the intensity and frequency spectrum of the scanning light it emits will begin to change, which will affect the quality of image scanning. At the same time, the high temperature will also affect the electroluminescent material inside the light-emitting diode, increase its decay rate, and shorten the life of the light-emitting diode. In addition, the circuit connected to the light-emitting diode may also be burned due to high heat.

In order to solve the problem of high thermal power of LEDs, a common solution is to reduce the density of the LED array, that is, reduce the number of LEDs and increase the distance between two adjacent LEDs. However, this method greatly reduces the light intensity emitted by the LED array, and also makes the distribution of the emitted light intensity uneven, which affects the quality of image scanning. To solve the problem of heat dissipation of LEDs, US Patent Publication No. US2006/0087828 (Taiwan Patent No. TWM251986) proposes a high heat dissipation LED tube as a light source for a scanning device. Publication No. US2006/0087828 includes a heat conduction cavity, a transparent cover plate and a plurality of light emitting diodes. The heat conduction cavity has a long opening, and the inside of the heat conduction cavity is provided with a reflective pattern corresponding to the opening. The transparent cover covers the opening of the heat-conducting cavity, and the light-emitting diodes are arranged at one or both ends of the heat-conducting cavity to project scanning light so that the scanning light is reflected by the reflective pattern and passes through the opening. However, in US2006/0087828, the light-emitting diodes are projected horizontally and then reflected to the opening by the reflective pattern, so that the uniformity of light intensity distribution along the opening is poor. light components to improve the light intensity distribution of LEDs. However, transparent materials such as epoxy resin are easily directly affected by the high heat of the light-emitting diodes, and the materials gradually deteriorate and become opaque, thus losing their light-guiding effect and directly blocking the light emitted by the light-emitting diodes.

Contents of the invention

The technical problem to be solved by the utility model is to provide a scanning device with a heat dissipation structure to improve the heat dissipation effect on the light emitting element.

In order to achieve the above purpose, the utility model discloses a scanning device with a heat dissipation structure, which is used to scan an image of a document and convert the image into image data. The scanning device with heat dissipation structure includes a casing, a top cover, a light emitting unit and an image sensing module. Wherein, an opening is formed on the top surface of the housing, and an accommodating space is formed inside the housing; the upper cover has a slot, a heat dissipation portion, and a bearing portion connected to the heat dissipation portion, wherein the bearing portion extends on the upper One side edge of the cover is slotted and extends toward the accommodation space of the housing to form a recessed bearing space, while the upper cover is fixed on the top surface of the housing and covers the opening; the light-emitting unit includes a base plate and multiple A point light source, wherein the substrate is fixed on the carrying part and is located in the carrying space, and a plurality of point light sources are arranged on the substrate in an array (can be one or more rows) for generating a scanning light to pass through the slot to the file, The scanning light is reflected by the document to form an image light. The image sensing module is disposed in the accommodation space of the casing, and is used for receiving image light and converting it into image data. Wherein, since the heat dissipation part is made of heat conducting material, such as metal or alloy, which can exchange heat with air, the heat generated by the point light source can be transferred to the heat dissipation part through the substrate and the bearing part.

One of the effects of the utility model is that the light-emitting unit is arranged on the bearing part, and the bearing part extends to one edge of the slot on the upper cover, so that the scanning light generated by it can be sent to the document directly or through the slot after being reflected. surface, simplifying the structure of the scanning device. The heat generated by the light-emitting unit can be directly conducted to the heat dissipation part through the bearing part, so as to dissipate the heat into the air. The surface area of the heat dissipation part can be adjusted according to the heat power emitted by the light-emitting element, so as to ensure its heat dissipation effect and maintain the temperature of the light-emitting element at the optimum working temperature.

In addition, the light-emitting element of the present invention can be quickly positioned at a predetermined position on the upper cover, and a plurality of first positioning portions are formed on one edge of the substrate of the light-emitting unit, and a plurality of first positioning portions corresponding to the first positioning portions are formed on the bearing portion of the upper cover. The second positioning part of the positioning part. The first positioning part and the second positioning part can be engaged with each other, so that the substrate can be quickly assembled and positioned on the predetermined position on the carrying part, so as to achieve the effect of fast assembly and modularization.

The above description about the contents of the utility model and the following description of the implementation are used to demonstrate and explain the principle of the utility model, and provide further explanation of the claims of the utility model.

Description of drawings

1 and 2 are schematic cross-sectional views of the first embodiment of the utility model;

Fig. 3 is an exploded perspective view of the upper cover and the light-emitting element in the first embodiment of the present invention;

Fig. 4 is a partial enlarged view of some components in Fig. 1;

Fig. 5 is an exploded schematic view of the upper cover in the first embodiment of the present invention;

Figure 6 is a schematic cross-sectional view of a second embodiment of the present invention; and

Fig. 7 is a schematic cross-sectional view of a third embodiment of the present invention.

Among them, reference signs:

100: Scanning device for heat dissipation structure 110: Housing

110a: Opening 110b: Accommodating space

120: Upper cover 122: Heat sink

124: Bearing part 124a: The first extension section

124b: Second extension section 124c: Carrying space

124d: reflective surface 124e: second positioning part

126: heat dissipation structure 128: slotting

130: Light emitting unit 131: Substrate

131a: First positioning unit 132: Point light source

140: Image sensing module 141: Mirror

142: Focusing element 143: Image sensing element

D: file

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present utility model, the detailed description is as follows in conjunction with the embodiments.

Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 4, which is a scanning device 100 with a heat dissipation structure disclosed in the first embodiment of the present invention, which is used to scan an image of a document D and convert the image for image data. The scanning device 100 with a heat dissipation structure includes a casing 110 , an upper cover 120 , a light emitting unit 130 and an image sensing module 140 .

An opening 110 a is formed on the top surface of the casing 110 , and an accommodating space 110 b is formed inside the casing 110 , wherein the image sensing module 140 is disposed in the accommodating space 110 b of the casing 110 .

The upper cover 120 has a slot 128, a heat dissipation portion 122, and a bearing portion 124 connected to the heat dissipation portion, wherein the bearing portion 124 extends from one side edge of the slot 128 of the upper cover 120 and faces toward the housing 110. The space 110b extends inside to form a concave carrying space 124c. The substrate 131 is fixed on the carrying portion 124 and is located in the carrying space 124c, and a plurality of point light sources 132 are arranged on the substrate 131 in an array (can be one or more rows) for generating a scanning light through the slot 128 to the document D, the scanning light is reflected by the document D to form an image light. The image sensing module 140 is disposed in the accommodating space 110b of the housing 110 for receiving image light and converting it into image data. Wherein, since the heat dissipation part 122 is made of a heat-conducting material, such as metal or alloy, which can exchange heat with the air, the heat generated by the point light source 132 can be transferred to the heat sink through the substrate 131 and the bearing part 124, which also have high thermal conductivity. Section 122. It should be noted here that the upper cover 120 can also be integrally made of heat-conducting material, such as metal or alloy. Alternatively, the heat dissipation part 122 and the bearing part 124 may be composed of parts of plastic materials spliced with heat-conducting materials.

The upper cover 120 is fixed on the top surface of the casing 110 by means of screws, clips or glue, and covers the opening 110a. The heat dissipation portion 122 of the upper cover 120 is a flat plate area to form a heat exchange surface in contact with the air, so as to increase the heat convection coefficient of heat exchange between the heat dissipation portion 122 and the air. And the inner or outer surface of the heat dissipation part 122 is formed with a plurality of concave and convex heat dissipation structures 126 (please refer to FIG. 6 ), such as fins, bumps, convex ribs or rough surfaces treated by sandblasting, so as to increase the surface area of the heat dissipation part 122. Increase heat convection coefficient.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the slot 128 is located adjacent to one side edge of the heat dissipation portion 122 and forms a long and narrow open area for the scanning light to pass through. The supporting portion 124 has a first extension section 124a extending from one side edge of the slot 128 and a second extension section 124b extending from the first extension section 124a to form the 124c. A reflective surface 124d is provided on the side of the first extension section 124a facing the carrying space 124c to reflect the scanning light passing through the slot 128 to the surface of the document D outside the casing 110 . The second extension section 124b is used to carry the light emitting unit 130 so that the light emitting unit 130 is located in the carrying space 124c and contacts the carrying portion 124, and projects scanning light toward the reflective surface 124d so that the scanning light is reflected by the reflective surface 124d. The scanning light emitted by the light-emitting unit 130 is reflected by the reflective surface 124d, then passes through the slot 128 and is projected on the document D located outside the casing 110, so that the scanning light is then reflected according to the image form on the surface of the document D to form an image light, and then directed toward the opening. Slot 128 is advanced. The width of the slot 128 is larger than that of the bearing portion 124 , so that the open area formed by the slot 128 is only partially blocked by the bearing portion 124 , allowing image light to enter the housing 110 through the slot 128 .

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4 again, the substrate 131 of the light-emitting unit 130 fixes the side of the second extension section 124b corresponding to the reflective surface 124d, and the point light source 132 can be a single light emitting diode, a small light bulb, etc. The point-emitting element is used for projecting scanning light towards the reflective surface 124 d , and the scanning light is reflected by the reflective surface 124 d and travels toward the outside of the casing 110 . A plurality of first positioning portions 131 a are formed on one edge of the base plate 131 , and a plurality of second positioning portions 124 e corresponding to the first positioning portions 131 a are formed on the carrying portion 124 of the upper cover 120 . The first positioning portion 131a and the second positioning portion 124e can engage with each other to position the substrate 131 at a predetermined position on the carrying portion 124, so that the substrate 131 can be quickly placed on the predetermined position on the carrying portion 124, and then pass The base plate 131 is fixed on the carrying portion 124 by means of glue, hooks or screws. Wherein the first positioning portion 131a is a protrusion extending from the side edge of the substrate 131, and the second positioning portion 124e is a positioning groove formed on the surface of the second extension section 124b of the bearing portion 124, and is inserted into the second positioning portion 131a through the first positioning portion 131a. In the second positioning portion 124e, the substrate 131 can be quickly assembled and positioned.

The image sensing module 140 includes a mirror 141 , a focusing element 142 and an image sensing element 143 . The reflector 141 is used to reflect the image light to change the traveling direction of the image light, and extend the optical path length of the image light, so that the image light moves toward the image sensing element 143 . The number of mirrors 141 can be one or more, and at least one mirror 141 is disposed under the slot 128 of the upper cover 120 , so that the image light can enter the mirror 141 and be reflected after passing through the slot 128 . The focusing element 142 is disposed in the housing 110 and in front of the image sensing element 143, so that after the image light is incident on the focusing element 142, it is focused on the image sensing element 143 by the focusing element 142, wherein the focusing element 142 can be a convex lens , a cylindrical lens or a lens group combining multiple lenses. The image sensing element 143 can be disposed at any position inside the housing 110 to match the optical path of the image light, wherein the image sensing element 143 is a Charge Coupled Device (CCD). The image sensing module 140 can also be composed of a single image sensing element, for example, a contact image sensing element (Contact Image Sensor, CIS) is used as the image sensing module 140 to save the focusing procedure and the long optical path required for focusing , that is, the mirror and focusing element can be omitted.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the upper cover 120 of the present invention includes a heat dissipation portion 122 made of a heat-conducting material, which has a high thermal conductivity. When the point light source 132 of the light emitting unit 130 operates and generates heat, the heat can be conducted to the bearing part 124 through the substrate 131 , and then quickly conducted from the bearing part 124 to the heat dissipation part 122 . Since the heat dissipation part 122 has a contact surface larger than the bearing part 124, the substrate 131 or the point light source 132 and the air, it can quickly exchange heat with the air, so that the heat generated by the point light source 132 is taken away by heat convection to maintain The optimum working temperature of the light emitting unit 130 makes the light emitting intensity and light spectrum of the light emitting unit 130 not change drastically due to temperature changes, and maintains the quality of image scanning.

Referring to FIG. 5 again, the upper cover 120 can be integrally formed by stamping, casting or other heat-conducting materials such as metals or alloys, or it can be spliced and formed by a plurality of components made of various materials. For example, the heat dissipation part 122 and the bearing part 124 with high heat conduction characteristics are manufactured separately first, and a slot 128 is opened near the edge of the heat dissipation part 122, and the bearing part 124 is spliced on the edge of the groove 128 and connected with the heat dissipation part 122. , and the heat dissipation portion 122 can also increase the heat dissipation surface area by bonding a plurality of metal elements. Alternatively, the upper cover 120 may be composed of plastic parts made of some plastic materials spliced together with a heat dissipation part 122 and a bearing part 124 made of a heat-conducting material, for example, the plastic part (not shown in the figure) and the heat-dissipating part made of a heat-conducting material are individually manufactured first. 122 and the carrying portion 124, and open a slot 128 near the edge of the heat dissipation portion 122, then splice the carrying portion 124 on the edge of the slot 128 and connect with the heat dissipation portion 122, and then splice the plastic parts with the heat dissipation portion 122 to form Become a loam cake 120.

Please refer to FIG. 6 again, which is a scanning device 100 with a heat dissipation structure disclosed in the second embodiment of the utility model, which is used to scan an image of a document D and convert the image into image data. The scanning device 100 with heat dissipation structure is substantially the same as the first embodiment, including a casing 110 , a top cover 120 , a light emitting unit 130 and an image sensing module 140 . The upper cover 120 is disposed on the top surface of the housing 110 to cover the opening, wherein the upper cover 120 has a slot 128 , a heat dissipation portion 122 made of a heat conducting material, and a bearing portion 124 connected to the heat dissipation portion 122 . The slot 128 is adjacent to one side edge of the heat dissipation portion 122 and forms a long and narrow open area corresponding to the opening of the housing 110 for light to pass through. The carrying portion 124 extends from one edge of the slot 128 of the upper cover 120 and extends toward the accommodating space 110 b of the casing 110 . A plurality of concavo-convex heat dissipation structures 126 are formed on the outside of the heat dissipation portion 122 , such as fins, bumps, convex ribs, or sandblasted rough surfaces, so as to increase the surface area of the heat dissipation portion 122 and improve the heat convection coefficient.

The carrying part 124 is used to carry the light-emitting unit 130, so that the light-emitting unit 130 is in contact with the carrying part 124, and projects a scanning light to the slot 128, and the scanning light is projected on the surface of the document D to be scanned toward the outside of the casing 110 through the slot 128, and then According to the shape of the image on the surface of the document D, it is reflected to form an image light, and then enters the casing 110 through the slot 128 . The image sensing module 140 is a contact image sensing element (CIS) to directly receive image light and convert it into image data, and the optical path length required by the contact image sensing element is smaller than that of the charge-coupled element, so the contact image The sensing element can be disposed in the accommodation space 110 b of the casing 110 and located under the slot 128 of the upper cover 120 , directly receives the image light reflected by the document D, and converts it into image data. Because the light-emitting unit 130 is fixed on the bearing part 124, the heat generated by its operation can be conducted to the heat dissipation part 122 through the bearing part 124, and then exchange heat with the air through the heat dissipation part 122, and dissipate heat to the outside to maintain the best work of the light-emitting unit 130 temperature.

Please refer to FIG. 7 again, which is a scanning device 100 with a heat dissipation structure disclosed in the third embodiment of the utility model, which is used to scan an image of a document D and convert the image into image data. The scanning device 100 with heat dissipation structure is substantially the same as the first embodiment, including a casing 110 , a top cover 120 , two light emitting units 130 and an image sensing module 140 . The upper cover 120 is disposed on the top surface of the casing 110 to cover the opening, wherein the upper cover 120 has a slot 128 , a heat dissipation portion 122 and two bearing portions 124 connected to the heat dissipation portion 122 . The slot 128 divides the heat dissipation portion 122 into two areas for heat exchange with the air. , and the slot 128 forms a long and narrow open area for light to pass through. The two carrying portions 124 respectively extend from two opposite side edges of the slot 128 of the upper cover 120 , extend toward the accommodating space 110 b of the housing 110 and correspond to each other. Each carrying portion 124 is used to carry one of the two light-emitting units 130 respectively, so that each light-emitting unit 130 is in contact with the carrying portion 124, and emits a scanning light respectively, so that the scanning light directly passes through the slot 128 or is received by each carrying portion 124. The reflection surface 124d passes through the slot 128 to the surface of the document D outside the casing 110 after reflection. The heat generated by the two light-emitting elements 130 can be conducted to the two heat-dissipating parts 122 through the two carrying parts 124 respectively, and then exchange heat with the air through the two heat-dissipating parts 122 to dissipate heat to the outside to maintain the optimum working temperature of the light-emitting unit 130 .

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these Corresponding changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (16)

1. A scanning device with a heat dissipation structure, used to scan an image of a file, and convert the image into image data, is characterized in that it includes: A casing, an opening is formed on its top surface, and an accommodating space is formed inside the casing; An upper cover, fixed on the top surface of the housing and covering the opening, the upper cover has a slot, a heat dissipation portion, and a bearing portion connected to the heat dissipation portion, the bearing portion extends from one of the slots a side edge extending toward the accommodating space of the housing; A lighting unit, which has: a base plate fixed on the carrying portion; and A plurality of point light sources are arranged on the substrate to generate a scanning light passing through the slot to the surface of the document, the scanning light is reflected to form an image light, and the heat generated by the point light source is transferred to the heat sink through the substrate and the bearing part Department; and An image sensing module is arranged in the accommodating space, receives the image light and converts it into image data. 2 . The scanning device with a heat dissipation structure according to claim 1 , wherein the upper cover is an integrally formed part made of metal or alloy heat-conducting material, or a part formed by splicing multiple elements of various materials. 3 . The scanning device with a heat dissipation structure according to claim 1 , wherein the width of the slot is larger than the width of the bearing portion. 4 . 4 . The scanning device with a heat dissipation structure according to claim 1 , wherein the heat dissipation portion is a flat plate area. 5 . The scanning device with a heat dissipation structure according to claim 1 , wherein a plurality of heat dissipation structures are formed on the inner surface or the outer surface of the heat dissipation portion. 6 . The scanning device with a heat dissipation structure according to claim 5 , wherein the heat dissipation structure is a fin, a bump, a rib or a rough surface treated by sandblasting. 7 . 7. The scanning device with a heat dissipation structure according to claim 1, wherein the supporting portion has a first extension section extending from one side edge of the slot, and a second extension section extending from the first extension section section, and the first extension section and the second extension section form a recessed bearing space. 8. The scanning device with a heat dissipation structure according to claim 7, wherein a reflective surface is provided on a side of the first extension section facing the bearing space, and the point light source of the light-emitting unit projects the light toward the reflective surface. Scanning light, the scanning light is reflected by the reflective surface to the surface of the document. 9. The scanning device with heat dissipation structure according to claim 1, characterized in that, the point light source of the light-emitting unit is arranged on the substrate of the bearing part, projects the scanning light toward the slot, and the scanning light passes through The slot is to the file surface on the outside of the housing. 10 . The scanning device with a heat dissipation structure according to claim 1 , wherein the slot is located close to one edge of the heat dissipation portion and forms a long and narrow open area. 11 . 11 . The scanning device with a heat dissipation structure according to claim 1 , wherein the slot divides the heat dissipation portion into two regions, forming a long and narrow open region. 12 . The scanning device with heat dissipation structure according to claim 1 , wherein each of the point light sources can be a light emitting diode or a small light bulb. 13 . 13. The scanning device with a heat dissipation structure according to claim 1, wherein a plurality of first positioning portions are formed on one edge of the substrate, and a plurality of positioning portions corresponding to the first positioning portions are formed on the bearing portion of the upper cover. A second positioning portion of the positioning portion, the first positioning portion and the second positioning portion engage with each other, and the substrate is positioned on the carrying portion. 14. The scanning device with a heat dissipation structure according to claim 13, wherein the first positioning portion is a protrusion extending from the side edge of the substrate, and the second positioning portion is formed on the surface of the bearing portion The positioning groove, the first positioning part is embedded in the second positioning part. 15 . The scanning device with a heat dissipation structure according to claim 1 , wherein the heat dissipation part is a component made of a heat-conducting material. 16. The scanning device with a heat dissipation structure according to claim 15, wherein the heat conducting material is metal or alloy.

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