WO2010143662A1 - Dispositif de lecture d'informations optiques - Google Patents

Dispositif de lecture d'informations optiques Download PDF

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Publication number
WO2010143662A1
WO2010143662A1 PCT/JP2010/059772 JP2010059772W WO2010143662A1 WO 2010143662 A1 WO2010143662 A1 WO 2010143662A1 JP 2010059772 W JP2010059772 W JP 2010059772W WO 2010143662 A1 WO2010143662 A1 WO 2010143662A1
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WIPO (PCT)
Prior art keywords
distance
information
lens
liquid
optical
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PCT/JP2010/059772
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English (en)
Japanese (ja)
Inventor
久水文也
川島安武
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株式会社オプトエレクトロニクス
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Publication of WO2010143662A1 publication Critical patent/WO2010143662A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/12—Fluid-filled or evacuated lenses
    • G02B3/14—Fluid-filled or evacuated lenses of variable focal length
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10792—Special measures in relation to the object to be scanned
    • G06K7/10801—Multidistance reading
    • G06K7/10811—Focalisation

Definitions

  • the present invention relates to an optical information reader having a focus function and a zoom function using a liquid lens.
  • Bar codes that are one-dimensional code information are well known for the purpose of merchandise management and inventory management.
  • a two-dimensional code is known as a code having a higher information density.
  • a method is known in which a two-dimensional code is photographed with a solid-state imaging device such as a CMOS image sensor or a CCD image sensor, and the image is subjected to various processing and then binarized and decoded. Yes.
  • the 2D code has a large amount of information that can be loaded, not only the price, product name, suppliers, etc., but also the information necessary for the management and sales side, as well as the production area, ingredients, simple precautions, usage, etc. It is also possible to provide information serving as a service when selling products to customers.
  • CMOS image sensor used in such a device that reads code information is not functionally different from what is mounted on a digital camera or the like, so it functions as a photographer that normally shoots objects and landscapes. Is required. For example, in the case of inventory management or the like, it is used when an image of a position where the article is stored together with the target article is stored in a database together with code information.
  • the mobile phone is equipped with a small camera using the above-described CMOS image sensor.
  • Most of the camera functions of mobile phones include a barcode / two-dimensional code scanner and an OCR (optical character reader), as well as images of landscapes and people, like ordinary digital cameras. is there.
  • An apparatus that performs imaging with a solid-state imaging device requires a configuration for focusing and a configuration for adjusting the size of an image, a configuration for automatically adjusting a focus position, a so-called autofocus function, and a configuration for changing a focal length, a so-called configuration.
  • a zoom function is required.
  • the auto focus function and zoom function a method of mechanically moving the lens position along the optical axis is known, but it is difficult to mount such a mechanism in a small device such as a mobile phone. is there. Therefore, there is a demand for a configuration in which the lens itself has an autofocus mechanism and a zoom. One of them is a liquid lens.
  • Patent Document 1 a technique for realizing a zoom function with a liquid lens has been disclosed (for example, see Patent Document 1).
  • Patent Documents 2 and 3 a technique in which a liquid lens is applied to a camera that captures a landscape or a person is disclosed (for example, see Patent Documents 2 and 3).
  • the present invention has been made to solve such a problem, and an object thereof is to provide an optical information reading apparatus having a focus function and a zoom function using a liquid lens with a simple configuration.
  • the present invention provides a first liquid and a second liquid, which have different optical refractive indexes and in which a boundary surface is formed without being mixed with each other, sealed in a container, Two or more liquid lenses to which a voltage for controlling the shape of the boundary surface between the liquid and the second liquid is applied are arranged with a predetermined interval at which the focal length can be changed by changing the shape of the boundary surface.
  • a lens module in which at least one optical lens is disposed, an imaging unit having a solid-state imaging device that photoelectrically converts an optical signal transmitted through the lens module, and a temperature detection unit that detects the temperature of each liquid lens, Control for performing focus control and zoom control based on distance measurement means for measuring the distance to the reading object, distance information to the reading object measured by the distance measurement means, and temperature information detected by the temperature detection means. It is an optical information reading and means.
  • the focal length can be continuously changed and the focal position can be adjusted to an arbitrary distance. Then, voltage information to be applied to the liquid lens is set based on the distance information to the reading object, and focus control for adjusting the focal position and zoom control for obtaining an image having a size suitable for decoding are performed.
  • the voltage information to be applied to the liquid lens is compensated by the temperature information, and optimum focus control and zoom control are performed even if the temperature fluctuates.
  • focus control and zoom control can be performed without moving the lens, and the focus function and zoom function can be realized with a simple configuration. Thereby, it becomes possible to incorporate in a small apparatus. Further, since focus control and zoom control are performed based on the distance information and the temperature information, a clear image can be acquired in a short time, and a clear image can be acquired even if the temperature fluctuates.
  • FIG. 1 is a functional block diagram illustrating an example of an optical information reading apparatus according to the present embodiment
  • FIG. 2 is an internal configuration diagram illustrating an example of a liquid lens constituting the lens module according to the present embodiment.
  • the optical information reading apparatus 1 includes a camera module 3 having a lens module 2 and a decoder 4.
  • the lens module 2 includes a plurality of liquid lenses, in this example, two liquid lenses 20A and 20B.
  • the liquid lens 20 ⁇ / b> A and the liquid lens 20 ⁇ / b> B are made of a conductive material that is an example of a first liquid in a cylindrical container 21 in which an incident surface 21 a and an output surface 21 b are formed of a transparent material that transmits light of a predetermined wavelength.
  • High-water solution 22 and insulating oil 23, which is an example of the second liquid, are sealed.
  • the aqueous solution 22 and the oil 23 are separated in a direction along the optical axis O of the liquid lens 20A and the liquid lens 20B, and a boundary surface 24 through which light is transmitted without being mixed with each other is formed.
  • the aqueous solution 22 and the oil 23 sealed by the liquid lens 20A and the liquid lens 20B have different light refractive indexes, and the light transmitted from the incident surface 21a to the output surface 21b is refracted at the boundary surface 24 between the aqueous solution 22 and the oil 23. Is done.
  • the liquid lens 20A and the liquid lens 20B include an electrode 25a in contact with the aqueous solution 22 and an electrode 25b in contact with both the aqueous solution 22 and the oil 23 through an insulating portion.
  • an electrode 25a in contact with the aqueous solution 22
  • an electrode 25b in contact with both the aqueous solution 22 and the oil 23 through an insulating portion.
  • Two liquid lenses 20 ⁇ / b> A and 20 ⁇ / b> B are arranged in series along the optical axis O, and in the liquid lenses 20 ⁇ / b> A and 20 ⁇ / b> B, the curvatures R ⁇ b> 1 and R ⁇ b> 2 of the boundary surface 24 between the aqueous solution 22 and the oil 23 are changed. It is possible to realize a function of continuously changing a focal distance called “focus” and a function of adjusting a focus position called “focus”.
  • the lens module 2 includes a thermistor 26A that detects the temperature of the liquid lens 20A and a thermistor 26B that detects the temperature of the liquid lens 20B.
  • the thermistors 26A and 26B are an example of temperature detection means.
  • the thermistor 26A is mounted on a flexible substrate (not shown) connected to the electrode of the liquid lens 20A, for example, so that the temperature around the liquid lens 20A can be accurately detected.
  • the thermistor 26B is mounted on a flexible substrate (not shown) connected to the electrode of the liquid lens 20B, for example, so that the temperature around the liquid lens 20B can be accurately detected.
  • the lens module 2 includes at least one optical lens 27.
  • the optical lens 27 is composed of, for example, a convex lens, and is disposed at the subsequent stage of the liquid lens 20B.
  • the liquid lens 20A, the liquid lens 20B, and the optical lens 27 are attached to a lens housing (not shown) with the optical axes aligned.
  • the optical lens 27 may be a single optical lens made of glass, plastic or the like that transmits light of a predetermined wavelength, or may be a combination of a plurality of optical lenses.
  • the camera module 3 includes the lens module 2 described above, an image sensor 30 that forms an imaging unit, and a distance measuring unit 31.
  • the image sensor 30 is an example of a solid-state imaging device, and photoelectrically converts an input optical signal and outputs an electrical signal.
  • a CMOS image sensor or a CCD image sensor is used as the image sensor 30, for example.
  • the image sensor 30 is disposed at a position where the light transmitted through the lens module 2 forms an image by the functions of the liquid lens 20 ⁇ / b> A, the liquid lens 20 ⁇ / b> B, and the optical lens 27.
  • the distance measuring unit 31 is an example of a distance measuring unit and includes, for example, a laser light receiving and emitting unit and the like, and measures the distance from the code symbol 5 that is a reading object.
  • the camera module 3 may include an illumination LED 32 that emits guide light indicating the code symbol 5 of the reading object.
  • the illumination LED 32 is provided as appropriate, and may not be mounted depending on the shape of the apparatus and the purpose of use.
  • the decoder 4 is an example of a signal processing unit, and performs control such as zoom and focus adjustment performed by the lens module 2, imaging performed by the image sensor 30, decoding of a signal output from the image sensor 30, and data transfer.
  • An ASIC (Application Specific Specific Integrated Circuit) 40 is provided as a means.
  • the decoder 4 includes a RAM 41 and a ROM 42 in which programs executed by the ASIC 40 and various tables are stored.
  • the decoder 4 is connected to the lens module 2 and the camera module 3 as a signal input / output unit, and is connected to an information processing apparatus such as an external host computer (not shown). I / O 44 is provided.
  • the optical information reading apparatus 1 may include an operation unit 45 as a setting unit in order to acquire identification information for identifying the type of the code symbol 5 that is an imaging target.
  • the operation unit 45 includes, for example, a display and a keyboard (not shown), and information is input or selected according to the display on the display. Further, without providing the operation unit 45, the identification information of the code symbol 5 may be acquired from an external information processing apparatus (not shown) and stored in the RAM 41.
  • the optical information reader 1 has a configuration in which the above-described components are mounted in a housing (not shown), for example, and a user can take an image with the hand.
  • the optical information reader 1 is a scanner that can read a code symbol 5 such as a bar code and a two-dimensional code. However, if the OCR software is installed, the optical information reader 1 can also read characters.
  • the ASIC 40 may be a combination of a CPU and an LSI such as an FPGA (Field Programmable Gate Array).
  • the optical information reading device 1 performs imaging when the reflected light from the code symbol 5 at an arbitrary distance forms an image on the image sensor 30, that is, when there is a so-called focus. This is because the content of the code symbol 5 cannot be decoded unless the image is clearly captured.
  • the camera module 3 includes a distance measuring unit 31 using a laser.
  • a laser distance measurement technique which measures the delay time between the start of the laser pulse and the return of the reflection to determine the distance.
  • the other is a parallax (parallax) technique, in which a beam is irradiated to form a spot on the imaging object, and the detection spot position on the imaging object is measured. The distance of the imaging object is determined from the detected spot position.
  • the distance measurement method is not limited to these examples, but the ASIC 40 is programmed to perform distance measurement by any one of these methods, for example.
  • the curvatures R1 and R2 of the boundary surface 24 between the aqueous solution 22 and the oil 23 change according to the applied voltage.
  • the curvatures R1 and R2 of the liquid lenses 20A and 20B change, the refractive power of the liquid lenses 20A and 20B changes. Therefore, an applied voltage necessary for focusing on a reading object at an arbitrary distance is uniquely determined. It is done.
  • the liquid lenses 20A and 20B are focused on.
  • the relationship between the voltage information V1 to be applied is measured to create a distance-voltage table TB1 and stored in the ASIC 40. Thereby, it is possible to acquire voltage information V1 corresponding to the distance to the code symbol 5 measured by the distance measuring unit 31.
  • the liquid lenses 20A and 20B need a standby time after the voltage is applied until the curvatures R1 and R2 according to the applied voltage become possible and imaging becomes possible.
  • This imaging standby time varies depending on the ambient temperature of the liquid lenses 20A and 20B.
  • FIG. 3 is a graph showing the relationship between the temperature and the response time of the liquid lens.
  • a predetermined voltage capable of focusing on the imaging target when applied to the liquid lens, changes in the sharpness of the image obtained through the liquid lens are shown by graphs 301 to 303 for each predetermined temperature.
  • the sharpness of an image that can be decoded by the ASIC 40 is defined as a threshold Th
  • the time until reaching the threshold Th is defined as an imaging standby time
  • the imaging standby time is generally smaller when the temperature is high
  • the graph As shown in 301 and graph 302 the imaging standby time at 60 ° C. is much shorter than the imaging standby time at 25 ° C.
  • the relationship between the temperature information Tp of the liquid lenses 20A and 20B and the imaging standby time information Tm is measured, and a temperature-standby time table TB2 is created and stored in the ASIC 40. Since the thermistors 26A and 26B are respectively provided in the liquid lenses 20A and 20B, the ambient temperature and the imaging standby time of the respective liquid lenses 20A and 20B are measured in advance.
  • FIG. 4 is a graph showing the relationship between the temperature measured by the thermistor and the standby time.
  • FIG. 4 shows the minimum imaging standby time at which a sharpness image that can be decoded by the ASIC 40 can be captured with respect to the temperature measured by the thermistors 26A and 26B. Thereby, it is possible to acquire imaging standby time information Tm according to the temperature of the liquid lens 20A measured by the thermistor 26A and the temperature of the liquid lens 20B measured by the thermistor 26B.
  • the distance-voltage table TB1 indicating the relationship between the distance information Ld up to the code symbol 5 and the voltage information V1 to be applied to the liquid lenses 20A and 20B, the temperature information Tp of the liquid lenses 20A and 20B, and the imaging.
  • Optimal focus adjustment is made by the temperature-standby time table TB2 showing the relationship with the wait time information Tm, and a clear image of the code symbol 5 can be captured.
  • the zoom function for continuously changing the focal length in the optical information reader 1 will be described.
  • the optical information reader 1 in order to decode the image of the code symbol 5 formed on the image sensor 30 by the ASIC 40, an image having a predetermined size is required according to the resolution of the image sensor 30.
  • the size of the image formed on the image sensor 30 is determined by the distance from the optical information reader 1 to the code symbol 5 that is the object to be read and the size of the code symbol 5. Therefore, the relationship between the angle of view ⁇ estimated from the distance information Ld to the code symbol 5 and the size information W of the code symbol 5 to be imaged is measured to create the distance-view angle table TB3 and store it in the ASIC 40. Keep it.
  • FIG. 5 is a graph showing the relationship between the distance to the code symbol and the angle of view.
  • FIG. 5 shows the angle of view with respect to the distance in Code 39 (pitch 0.254, width 70 mm), which is a general one-dimensional code. If the size of the code symbol 5 and the distance to the code symbol 5 are known, it is possible to predict the angle of view necessary for obtaining an image of a desired size. Thus, if a distance-view angle table TB3 such as a PDF417 code or a two-dimensional code that is frequently used as a reading object is created, the view angle can be acquired from the distance information.
  • a distance-view angle table TB3 such as a PDF417 code or a two-dimensional code that is frequently used as a reading object
  • the angle of view at which the image formed on the image sensor 30 has a predetermined size is determined by the focal length of the lens module 2, and the focal length of the lens module 2 is determined by the combination of the curvatures R1 and R2 of the liquid lenses 20A and 20B. Therefore, the relationship between the focal length of the lens module 2 and the applied voltage is uniquely determined.
  • the relationship between the focal length information fd for determining the angle of view ⁇ of the lens module 2 and the voltage information V2 to be applied to the liquid lenses 20A and 20B is measured, and the focal length-voltage table TB4 is created and stored in the ASIC 40. Keep it. Note that the temperature-standby time table TB2 described above is also necessary when performing zooming. As a result, it is possible to acquire voltage information V2 corresponding to the distance to the code symbol 5 measured by the distance measuring unit 31 and the size of the code symbol by using the distance-view angle table TB3 and the focal length-voltage table TB4. Become.
  • FIG. 6 is a configuration diagram showing the arrangement of each lens in the lens module of the present embodiment.
  • the lens module 2 includes at least two liquid lenses 20A and 20B and one optical lens 27 as described above.
  • the focal length f from the principal point determined by the curvature and arrangement of each lens changes.
  • the optical lens 27 is illustrated as having a main point. Further, the focal length f is also changed by changing the distance Le between the liquid lens 20A and the liquid lens 20B.
  • the distance L between the image-side liquid lens 20A and the image FC to be read is 100 mm, and the distance Lg between the image lens 30-side liquid lens 20B and the optical lens 27 is 3 mm.
  • changes in the angle of view when the curvature R1 of the liquid lens 20A, the curvature R2 of the liquid lens 20B, and the distance Le between the liquid lens 20A and the liquid lens 20B are changed are measured.
  • the angle of view (half value) of only the optical lens 27 is 16 °.
  • FIG. 7 is a graph showing the change in the curvature of the liquid lens during zooming
  • FIG. 8 is a graph showing the relationship between the distance between the liquid lenses and the angle of view. From the result of FIG. 8, it can be seen that the zoom magnification of the lens module 2 can be increased as the distance between the liquid lens 20A and the liquid lens 20B is increased.
  • FIG. 9 to 11 are configuration diagrams showing specific examples of lens modules.
  • the zoom magnification increases as the distance Le between the liquid lens 20A and the liquid lens 20B increases.
  • the distance Le between the liquid lens 20 ⁇ / b> A and the liquid lens 20 ⁇ / b> B is increased, the ambient light does not reach the image sensor 30 by hitting the lens barrel between the liquid lenses, resulting in insufficient light quantity or so-called vignetting.
  • the distance Le between the liquid lens 20A and the liquid lens 20B is about 9.6 mm at the maximum.
  • the angle of view ⁇ can be changed from 14.329 ° to 17.8443 °, and the zoom magnification is 1.26 times.
  • the configuration includes two liquid lenses 20 ⁇ / b> A and 20 ⁇ / b> B and one optical lens 27, and a concave meniscus lens 28 is added to the top of the lens group to narrow the light.
  • the zoom magnification can be increased by separating the distance Le between the liquid lens 20A and the liquid lens 20B without reducing the peripheral light amount as compared with the configuration of FIG. 9 that does not include the concave meniscus lens. it can.
  • the distance Le between the liquid lens 20A and the liquid lens 20B is about 17 mm at the maximum.
  • the angle of view ⁇ can be changed from 13.003 ° to 17.924 °, and the zoom magnification is 1.4 times.
  • the configuration includes two liquid lenses 20A and 20B.
  • the zoom magnification can be further increased by increasing the number of liquid lenses to two or more. Therefore, in FIG. 11, four liquid lenses 20A, 20B, 20C, and 20D are provided, a concave meniscus lens 28 is provided in the front stage of the liquid lens group, and an optical lens 27 is provided in the rear stage.
  • the distance Le between the liquid lens 20A and the liquid lens 20D at both ends is about 30 mm at the maximum.
  • the angle of view ⁇ can be changed from 9.8 ° to 21.95 °, and the zoom magnification is 2.3 times.
  • FIG. 12 is a flowchart showing an example of processing of the optical information reading apparatus according to the present embodiment
  • FIGS. 13 to 15 are explanatory diagrams of the operation of the liquid lens.
  • step S1 of FIG. 12 the operation unit 45 is operated to set the type of the code symbol 5 to be read.
  • the ROM 42 stores in advance identification information for specifying the type of the code symbol 5 and the like, and the identification information of the code symbol 5 to be read is selected by the operation on the operation unit 45.
  • the ASIC 40 measures the distance from the output of the distance measuring unit 31 to the code symbol 5 in step S2 to acquire the distance information Ld, and from the outputs of the thermistors 26A and 26B, the liquid lens 20A. , 20B temperature information Tp is acquired.
  • step S3 the ASIC 40 needs to zoom the distance to the code symbol 5 from the identification information of the code symbol 5 set by the operation unit 45 and the distance information Ld to the code symbol 5 detected by the distance measuring unit 31. It is determined whether or not the value is greater than a certain value.
  • the distance-view angle table TB3 corresponding to the identification information of the code symbol 5 set in the operation unit 45 is selected in step S4. To do. Then, referring to the distance-view angle table TB3, the focal length-voltage table TB4, and the temperature-standby time table TB2, the distance information Ld up to the code symbol 5 detected by the distance measuring unit 31 and the thermistors 26A, 26B Voltage information V2 and imaging standby time information Tm corresponding to the detected temperature information Tp of the liquid lenses 20A and 20B are acquired.
  • the voltage information V2 is set for each of the liquid lenses 20A and 20B, and when the distance to the code symbol 5 is far, a voltage that increases the size of the image formed on the image sensor 30 is applied. Is done.
  • the curvatures R1 and R2 of the liquid lens 20A and the liquid lens 20B that is, the curvatures R1 and R2 of the boundary surface 24 between the aqueous solution 22 and the oil 23 in the liquid lens 20A and the liquid lens 20B are concave. Such a voltage is applied.
  • the zoom is performed so that the size of the image formed on the image sensor 30 is increased. If the distance is equal to or smaller than another fixed value, zooming may be performed so that the size of the image formed on the image sensor 30 is reduced.
  • a voltage is applied so that the curvatures R1 and R2 of the liquid lens 20A and the liquid lens 20B are convex.
  • the distance measuring unit 31 refers to the distance-voltage table TB1 and the temperature-standby time table TB2 in step S5.
  • the voltage information V1 and the imaging standby time information Tm corresponding to the detected distance information Ld to the code symbol 5 and the temperature information Tp of the liquid lenses 20A and 20B detected by the thermistors 26A and 26B are acquired.
  • the voltage information V1 is set for each of the liquid lenses 20A and 20B, and a voltage is applied so that the image of the code symbol 5 at the position specified by the distance information Ld is formed on the image sensor 30.
  • a voltage corresponding to the distance information Ld is applied from a state in which the curvatures R1, R2 of the liquid lens 20A and the liquid lens 20B are flat.
  • step S6 the ASIC 40 performs zoom control according to the identification information of the code symbol 5 and the distance information Ld to the code symbol 5, and focus control according to the distance information Ld to the code symbol 5, and the thermistors 26A, After the imaging standby time corresponding to the temperature information Tp of the liquid lenses 20A and 20B detected at 26B has elapsed, the code symbol 5 is imaged by the image sensor 30.
  • step S7 the ASIC 40 determines whether the size of the captured code symbol 5 is appropriate for decoding.
  • zoom control is performed with reference to the distance-view angle table TB3 and the focal length-voltage table TB4 based on the identification information of the code symbol 5 and the distance information Ld to the code symbol 5. Yes.
  • the optical information reader 1 can recognize the assumed size of the code symbol 5 to be read by setting the identification information of the code symbol 5 to be read in advance. Therefore, normally, an image of a desired size can be acquired by performing zoom control with reference to the distance-view angle table TB3 and the focal length-voltage table TB4.
  • step S7 it is determined whether or not the size of the captured code symbol 5 is appropriate for decoding.
  • step S8 If it is determined in step S7 that the size of the captured code symbol 5 is appropriate for decoding, in step S8, the captured image data is decoded and data indicating the content of the code symbol 5 is output. . On the other hand, if it is determined in step S7 that the size of the captured code symbol 5 is not an appropriate size for decoding, the process returns to step S4 to perform zoom control according to the size information W of the code symbol 5. The code symbol 5 is imaged and decoded again.
  • the identification information of the code symbol 5 is acquired in advance.
  • the code symbol 5 may be imaged by the image sensor 30 and the feature point is detected to identify the code symbol.
  • the present invention can be used for a barcode reader, a two-dimensional code reader, and the like, and can realize autofocus and zoom with a small device.
  • SYMBOLS 1 Optical information reader, 2 ... Lens module, 3 ... Camera module, 4 ... Decoder, 20A, 20B ... Liquid lens, 26A, 26B ... Thermistor, 27 ... ⁇ Optical lens, 30 ... Image sensor, 31 ... Ranging unit, 40 ... ASIC

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Automatic Focus Adjustment (AREA)
  • Studio Devices (AREA)
  • Focusing (AREA)
  • Lens Barrels (AREA)
  • Lenses (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

La présente invention concerne un dispositif de lecture d'informations optiques qui est dotée d'une fonction de mise au point et d'une fonction de zoom à l'aide d'une lentille liquide de configuration simple. Le dispositif de lecture d'informations optiques (1) est équipé d'un module de lentilles (2) dans lequel des lentilles liquides (20A, 20B), qui changent les formes des surfaces limites lorsqu'une tension est appliquée, sont disposées selon un intervalle préétabli avec lequel des distances de point focal peuvent être modifiées par la modification des formes des surfaces limites, et dans lequel au moins une lentille optique (27) est disposée ; d'un capteur d'images (30) qui convertit de façon photoélectrique des signaux optiques qui ont traversé est le module de lentilles (2) ; des thermistances (26A, 26B) qui détectent les températures des lentilles liquides (20A, 20B) ; une unité de mesure de la distance (31) qui mesure la distance à un repère en code (5) ; et un ASIC (circuit intégré spécifique) (40) qui effectue une commande de mise au point et une commande du zoom sur la base des informations de la distance mesurée au moyen de l'unité de mesure de la distance (31) et des informations des températures détectées au moyen des thermistances (26A, 26B).
PCT/JP2010/059772 2009-06-12 2010-06-09 Dispositif de lecture d'informations optiques WO2010143662A1 (fr)

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CN114097214A (zh) * 2019-04-26 2022-02-25 欧姆龙株式会社 图像传感器
CN115903103A (zh) * 2022-11-15 2023-04-04 苏州灵猴机器人有限公司 一种液体镜头补偿系统的补偿方法、装置、设备及介质
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CN105069394A (zh) * 2015-07-23 2015-11-18 福建联迪商用设备有限公司 二维码加权平均灰度法解码方法及系统
CN105069394B (zh) * 2015-07-23 2017-10-10 福建联迪商用设备有限公司 二维码加权平均灰度法解码方法及系统
CN109557639B (zh) * 2017-09-27 2023-06-30 康耐视公司 具有适应性视角和工作距离的光学系统及其制造和使用方法
US20190094424A1 (en) * 2017-09-27 2019-03-28 Cognex Corporation Optical systems having adaptable viewing angle and working distance, and methods of making and using the same
CN109557639A (zh) * 2017-09-27 2019-04-02 康耐视公司 具有适应性视角和工作距离的光学系统及其制造和使用方法
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CN113454976B (zh) * 2018-12-18 2023-08-04 Lg伊诺特有限公司 包括液体透镜的相机模块
CN113454976A (zh) * 2018-12-18 2021-09-28 Lg伊诺特有限公司 包括液体透镜的相机模块
WO2020153789A1 (fr) * 2019-01-25 2020-07-30 엘지이노텍(주) Module de lentille liquide et dispositif optique le comprenant
CN113748669A (zh) * 2019-04-26 2021-12-03 欧姆龙株式会社 图像传感器
CN114097214A (zh) * 2019-04-26 2022-02-25 欧姆龙株式会社 图像传感器
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CN113960704A (zh) * 2021-11-02 2022-01-21 深圳技术大学 液态镜头的自动对焦方法、系统、装置及存储介质
CN113960704B (zh) * 2021-11-02 2023-10-27 深圳技术大学 液态镜头的自动对焦方法、装置及存储介质
CN115903103A (zh) * 2022-11-15 2023-04-04 苏州灵猴机器人有限公司 一种液体镜头补偿系统的补偿方法、装置、设备及介质
WO2024159145A3 (fr) * 2023-01-27 2024-09-06 Cognex Corporation Systèmes optiques à commande d'angle de visualisation adaptable

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