TWI226458B - Flat light-focusing apparatus - Google Patents

Abstract

The present invention is related to a kind of flat light-focusing apparatus and is particularly related to a light-focusing apparatus applied in the optical path apparatus. The invention includes the followings: a hollow frame with a rectangular cross section; and plural lenses disposed inside the frame. The opening is disposed coaxially with the lens; and the size of the lens is smaller or equal to the lens such that the lens at most stacks to the peripheral edge of the lens.

Description

92124934 1226458

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a flat condensing server (such as a scanner or photocopier) ^, and particularly refers to a method used to gather light reflected from a manuscript = Condensing lens with the shape of [prior art] on a photoelectric conversion device. The image of a general image reading device is 罟 Γ, 护, 浐, 止, 风, 止, 像, and the imaging principle is based on an optical path device (C, also known as an optical engine). # * ^ y Liver Nine Lines are reflected by a 1-light device (usually a lens (1 D WeilS) when they are from ^ 1) after multiple reflections, and then converted into electrical by a photoelectric Ϊ / Λ Signal-powered sub-device processing and memory photoelectric conversion devices

Coup ed Device (referred to as CCD), and there is also the use of complementary metal oxide semiconductors (Complementary Metal_xide ("CD", "Shi", referred to as COMS)). During the travel of light, because optical imaging requires a certain length of optical path to narrow its width, usually the number of reflectors is used to narrow the imaging width of the light as the path length increases in order to reduce Its size is finally collected by the light condensing device to form an image on the photoelectric conversion device. Please refer to the first figure, which is a schematic diagram of the optical path device of the currently used image reading device. The optical engine 1 includes a light source 13, three rectangular mirrors (1, 4, 15, 16), a light-concentrating device 17, and a charge-coupled element. The light from the light source 13 is transmitted through a transparent glass 12 to a manuscript 11. After the manuscript 11 is irradiated, the light is sequentially reflected to the first mirror 14, the second mirror 15 and the third mirror 1 6. The third reflecting mirror 16 directs the light toward the light-concentrating device 17, and after condensing the light through the light-concentrating device 17, the light is directed toward a charge-coupled element 18. The optical path device 1 is driven by a driving device (not shown) to linearly move along a guide rod 19 to scan the original.

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1226458 _Case No. 92124934_Year Month__ V. Description of the invention (2) However, the lenses in the prior art have the following disadvantages: 1. Please refer to the second figure, which is a schematic diagram of the effect of the focusing device on light. The light-concentrating device 17 is composed of a plurality of cylindrical lenses fixed in a housing. The light-concentrating device 1 takes up a lot of space in the optical path device 1 and easily affects the travel path of light. When the overall amount of light is to be increased, its diameter and its length need to be increased, as shown by the dotted light-concentrating device 17 ', resulting in difficulty in design. 2. Please refer to the third figure, which is a schematic diagram of the light projected onto the charge coupling element through the light concentrating device. The charge-coupled element 4 of the image reading device is an elongated sensor that performs data conversion and collection in a row-to-row manner. Therefore, the light data of the entire cylindrical lens is not actually needed. The previous technology used a cylindrical lens, so it was easy to mix other data with it, resulting in poor optical resolution (Modulation Transfer Function, MTF for short). 3. As shown in the third figure, due to the conventional focusing device, that is, the cross-sectional area Al and A 2 of the vertical direction of the cylindrical lens 17, are not the same, so when the light source S passes through the focusing device 17 and is projected to charge The light of the coupling element 4 is also not uniform, resulting in a strong incident light intensity in the middle of the charge-coupled element as shown in the fourth figure and a weaker end at both ends, which results in uneven brightness during optical imaging. [Summary of the Invention] The main object of the present invention is to provide a flat condensing device and a method for manufacturing the same. The main purpose of the present invention is to provide a flat condensing lens used in a scanner to reduce the volume occupied in the optical path device and make it It is more convenient in design, and captures single-line data to reduce unnecessary data from other lines and improve the resolution of the scanner, which can make the optical imaging more bright.

1226458 _ Case No. 92124934_ Year Month Day__ 5. Description of the invention (3) The degree is more uniform. In order to achieve the above object, the present invention provides a flat condensing device and a manufacturing method thereof, comprising a hollow frame having a rectangular cross-section; and a plurality of rectangular lenses provided in the frame; wherein the opening is coaxially provided with the lens. The size of the opening is less than or equal to the lens and overlapped to the periphery of the lens at most. The preferred embodiments of the present invention are described in detail below with reference to the drawings, but these descriptions are only used to illustrate the present invention, and not to limit the scope of rights of the present invention in any way. [Embodiment] Please refer to FIG. 5 and FIG. 6, which are a perspective view and a front view of a flat condensing device of the present invention, respectively. The flat lens 3 is set in an optical path device of an optical device, for example, it can be an optical engine of a scanner, which has a frame 32 with a rectangular cross section, and is a flat housing with a rectangular shape. The two ends are open, and a lens group 30 is disposed therein, including a plurality of rectangular lenses 3 4, 3 6, 3 8 for collecting light to form an image on a photoelectric conversion device 4 (such as a charge-coupled device); the opening and The rectangular lenses 3 4, 3 6, 3 8 are coaxially arranged, and the size of the opening is equal to or smaller than the rectangular lenses 3 4, 36, 38 and overlapped to the peripheral edges of the rectangular lenses 34, 36, 38 at most. The frame 32 is made of plastic, metal or ceramic. The manufacturing method of the lenses 3, 4, 6, and 8 can be molded or obtained by cutting the glass lens, but the cost is too high. The present invention proposes that the lens can be made of a plastic material by more precise plastic injection. It can be manufactured at a lower cost. This kind of precise plastic injection technology is a method often used at present in the lens of a digital camera, which is not described in detail here.

Page 7 1226458. ^ -------- MM 92124934_year month g_correction__ 5. Description of the invention (4) In the present invention, the lens group 30 includes at least one light incident sheet 34, and its size corresponds to The scanning size of the scanner (such as A 3 or A 4 size), a condenser sheet group 36, and a beam splitter sheet 38, the size of which is designed corresponding to the size of the photoelectric conversion device 4, wherein The sheet group 36 corresponds to the light incident sheet 34 and the beam splitter sheet 38, and can have different designs according to the requirements of the beam splitter sheet 38. Since the photoelectric conversion device 4 is usually fixed by a bracket, the frame 32 in the present invention and the bracket of the photoelectric conversion device 4 can be combined into one, that is, the photoelectric conversion device 4 can be installed in the bracket. The inside of one end of the frame 32 can thereby reduce the interference effect of external light. The frame 32 of the present invention can be integrally formed, and some engaging mechanisms can be provided inside, for the assembly of the lens group 30-- to be engaged with the inside of the frame 32, and even some adhesive can be fixed. . Please refer to the seventh figure at the same time, which is a graph of the light intensity of the reflected light collected on the photoelectric conversion device by the flat light-concentrating device of the present invention. Because the reflected light passes through the flat condensing device of the present invention, its cross-sectional area is homogeneous, and this transmitted light intensity curve with less fluctuations reduces stray light, that is, the confusion of other data, which can reduce the The entry of necessary light can effectively improve its resolution (MTF). Please refer to the eighth figure, which is a perspective view of a preferred embodiment of the flat condensing device of the present invention. The frame 3 2 is made of metal or ceramic, and the package = has a plurality of sub frames 3 3, 3 5, 3 7. The lenses 3, 4, 6, 3, and 8 can be formed on the corresponding sub-frames 3 3, 3, 5 and 37 respectively. The sub-frames are made of 3 3 3 5 or ceramic materials. Frame 33,

1226458 Case No. 92124934 Amended 5. Description of the invention (5) The material is not easily deformed by the influence of temperature, and the invention can be quickly assembled. In addition, the photoelectric conversion device 4 can also be set on a same sub-frame to speed up assembly. Please refer to the ninth figure, which is a perspective view of another embodiment of the flat condensing device of the present invention. The flat condensing device 3 ′ of the present invention may also be provided with a circular lens group 3 0 ′ in a flat frame 3 1, and the two ends of the flat frame 3 1 are formed as a slightly rectangular incident area 3 1 2 And the exit area 3 1 4 to block unnecessary light; the opening is arranged coaxially with the circular lens group 30 ′, and the size of the opening is less than or equal to the circular lens group 30 ′ and is superimposed to the circle at most The periphery of the lens group 30 '. Since the circular lens group 3 0 ′ is easy to obtain in this embodiment, only the flat frame 31 needs to be manufactured, and the height of the light condensing device can still be effectively reduced. Please refer to the tenth figure, which is a perspective view of the flat condensing device of the present invention assembled in an optical path device. The optical path device 5 is mainly installed in an image reading device, such as a scanner or a multifunction printer. The optical path device 5 includes a light source device 53 to provide the required light; a reflecting device including at least one reflecting mirror 54 to reflect the light at least once to reach a predetermined optical path length; The fixing device 56 fixes the light condensing device 3 in the optical path device 5; and a photoelectric conversion device 55 receives the light imaged by the light condensing device 3 and converts it into electrical signals. The light-concentrating device 3 receives the light reflected by the reflecting device 54 and collects and images the light. The light-concentrating device 3 includes a hollow frame 32 'having a flat oblong cross-section; and a rectangular lens group 30 disposed on the frame 32. 'Inside. The photoelectric conversion device 5 5 can be installed in the frame 32 'of the light collecting device 3. It is worth noting that only one reflector is provided in this embodiment. This is because the light concentrating device of the present invention is flat, and in terms of the structural design of the optical path device,

1226458 92124934__ Modification of Renyue's Day: Explanation of the invention (6)-Due to the interference path of the converging light, there is no restriction on the width. By increasing the width of the front end of the device ^ ^ for a higher light input Wide-angle design, so the light path (t〇tal track) of the King of the eve of the mirror, shortening the optical path, the number of reflections can be reduced and the number of reflections can be reduced, and the number of reflectors can be reduced. It can be more simplified in structure. Referring to FIG. 11, a flowchart of the manufacturing steps of the flat condensing device according to the present invention is shown. The manufacturing steps of the flat condensing device include: Step 60, providing a plurality of sub-frames; Step 70, forming an engaging portion at two ends of each sub-frame to connect to each other; Step 80, injection with plastic A lens is set in the sub-frame in a manner; Step 90 'combines the sub-frame into a frame. The manufacturing steps of the flat condensing device described above further provide a pair of frames at the ends of the condensing device to accommodate a photoelectric conversion device. Therefore, the features and functions that can be generated by the present invention are organized as follows: 1. The design of a flat condensing device can reduce the optical path interference area and reduce the height of the optical path device. 2. As a flat local lens is adopted, compared with the peak area of the image, it can reduce stray light and improve the resolution (MTF). 3. As it is a flat design, there is no width limitation, so it can be used for wide-angle design with high light output. Fourth, because it can be used for higher light and wide-angle design, it can reduce the total #% total track. After the optical path is shortened, the number of mirror reflections can be reduced, and the number of mirrors can be reduced, which can reduce costs. Fifth, the optical path is shortened, the number of mirrors is reduced, the incident brightness is increased, the image quality is increased, and the requirements for assembly accuracy can be reduced.

Page 10 1226458 Case No. 92124934 Amendment V. Description of the invention (7) In summary, the present invention complies with the requirements of an invention patent, and an application is filed in accordance with the law. However, those disclosed above are only the preferred embodiments of the present invention. Since the scope of rights of the present invention cannot be limited by this, equivalent changes or modifications made according to the scope of application of the present invention still fall within the scope of the present invention. The review members are still requested to take time to review and look forward to granting patents early to encourage inventions.

1226458 Case No. 92124934 Amendment Brief description of the drawing [Simplified description of the drawing] The first picture: a schematic diagram of the optical path device of a conventional image reading device. The second figure is a schematic diagram of the effect of a conventional light-concentrating device on light. The third figure is a schematic view showing that the conventional light-concentrating device collects the reflected light on the charge-coupled element. The fourth graph: a graph of light intensity on a conventional charge-coupled element. Fifth image: A perspective view of a flat lens of the present invention. FIG. 6 is a front view of the flat lens of the present invention. Fig. 7 is a graph of the intensity of light rays focused on the charge coupling element by the flat light-concentrating device of the present invention. FIG. 8 is a perspective view of a preferred embodiment of the flat condensing device of the present invention. The ninth figure is a perspective view of another embodiment of the flat condensing device of the present invention. The tenth figure: is a perspective view of the flat light concentrating device assembled in the optical path device of the present invention. Fig. 11 is a flowchart showing the manufacturing steps of the flat condensing device of the present invention. Reference number in the figure] Conventional] Light path device 1 Bottom cover 11 Transparent glass 12 Light source 13 Reflector 14, 15, 16 Condensing device 17, 17, Electricity device 7G piece 18 Guide rod invention] 19 Cross-sectional area A1, A2

1212458 _Case No. 92124934_Year Month and Day Revised Schematic Brief Description Flat Condenser 3, 3 'Rectangular Lens Group 30 &30; 30' Receiving Base 31 Frame 32 > 32J Shooting Area 312 Light-in Sheet 34 Shooting Area 314 Condensing sheet 36 Beamsplitter 38 Sub frame 33, 35, 37 Engagement section 3 3a, 3 5a, 35b, 37a Photoelectric conversion device 4 Optical path device 5 Light source device 53 Reflection device 54 Photoelectric conversion device 55 Fixing device 66

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Claims (1)

1226458 Case No. 92124934 Amendment VI. Patent Application Scope 1. A flat light condensing device, which is set in the optical path device of the image reading device, includes: a hollow frame with rectangular openings at both ends; and a plurality of A lens is disposed in the frame; wherein the opening is coaxially provided with the lens, and the size of the opening is smaller than or equal to the lens and overlapped to the periphery of the lens at most. 2. The flat condensing device according to item 1 of the scope of the patent application, wherein the frame is integrally formed, and the material can be plastic, metal or ceramic, and the plurality of rectangles are locked in the frame. 3. The flat condensing device as described in item 1 of the scope of the patent application, wherein the lens is a circular lens, and the two ends of the frame have rectangular light entrance and exit areas. 4. The flat condensing device according to item 1 of the scope of patent application, wherein the frame includes a plurality of sub-frames made of metal or ceramic, and each of the two ends of each sub-frame has an engaging portion To connect with each other. 5. The flat condensing device as described in item 4 of the scope of the patent application, wherein the lens is a rectangular lens made of plastic material and each is formed in the corresponding sub-frame, so that the lens is not easily affected by temperature. Deformation. 6. The flat condensing device according to item 1 of the scope of the patent application, wherein the lens includes a light incident sheet, the size of which corresponds to the scanning size of the scanner, a condenser sheet group, and a beam splitter, and its size Corresponding to the size of the charge-coupled element, wherein the light-condensing lens group is composed of more than one lens. 7. The flat condensing device as described in item 1 of the scope of patent application, which Page 14 1226458 Case No. 92124934 Amendment 6. In the scope of patent application, a charge-coupled element is assembled in the frame. 8. An optical path device, which is mainly provided in an optical device, the optical path device includes: a light source device to provide the required light; a reflecting device including at least one reflector, each reflecting mirror performs the light At least one reflection to reach a predetermined optical path length; a light-condensing device that receives and reflects the light reflected by the reflection device, and includes a hollow frame with a flat rectangular cross section and a plurality of lenses , Arranged in the frame; wherein the opening is coaxial with the lens, and the size of the opening is smaller than or equal to the lens and overlapped to the periphery of the lens; The imaged light is converted into electrical signals. 9. The optical path device according to item 8 in the scope of the patent application, wherein the photoelectric conversion device is placed in the end of the frame of the light concentrating device. 10. The optical path device according to item 8 of the scope of the patent application, wherein the frame is integrally formed, and the material may be plastic, metal or ceramic, and the plurality of rectangular lenses are engaged in the frame. 1 1. The optical path device according to item 8 of the scope of patent application, wherein the frame is composed of a plurality of metal or ceramic sub-frames, and the lenses are rectangular lenses made of plastic materials, each of which is formed on On the corresponding sub-frames, two ends of each of the sub-frames are respectively formed with engaging portions to be connected to each other, thereby the lens is not easily deformed by the influence of temperature. 1 2. The flat condensing device as described in item 8 of the scope of patent application, which Page 15 1226458 _Case No. 92124934 _ Month and Date __ VI. In the scope of patent application, the lens is a circular lens, and the two ends of the frame are rectangular in the light incident area and the outgoing area. 13. The optical path device as described in item 8 of the scope of the patent application, wherein the lens includes a light incident sheet whose size corresponds to the scanning size of the scanner, a condenser sheet group, and a beam splitter sheet, and its size Corresponding to the size of the charge-coupled element, wherein the light-condensing sheet is an aspheric design. 14. The optical path device according to item 8 of the scope of the patent application, wherein the end of the oblong condensing device near the reflecting device is equal to or larger than the end of the photoelectric conversion device. Page 16