WO2014020123A1 - Réglage de focalisation d'un laser d'exploration dans l'appareil - Google Patents

Réglage de focalisation d'un laser d'exploration dans l'appareil Download PDF

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Publication number
WO2014020123A1
WO2014020123A1 PCT/EP2013/066219 EP2013066219W WO2014020123A1 WO 2014020123 A1 WO2014020123 A1 WO 2014020123A1 EP 2013066219 W EP2013066219 W EP 2013066219W WO 2014020123 A1 WO2014020123 A1 WO 2014020123A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage film
laser beam
focal point
unit
power
Prior art date
Application number
PCT/EP2013/066219
Other languages
German (de)
English (en)
Inventor
Robert WENZKO
Bernd Philipps
Michael Weber
Original Assignee
DüRR DENTAL AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DüRR DENTAL AG filed Critical DüRR DENTAL AG
Publication of WO2014020123A1 publication Critical patent/WO2014020123A1/fr

Links

Classifications

    • 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
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/08—Visualisation of records by optical means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/0408—Different densities of dots per unit length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/042—Details of the method used
    • H04N1/0432—Varying the magnification of a single lens group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/042—Details of the method used
    • H04N1/0446—Varying the modulation time or intensity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
    • H04N2201/0404—Scanning transparent media, e.g. photographic film
    • H04N2201/0412—Scanning X-ray films

Definitions

  • the invention relates to a scanning laser device for scanning a storage film, in particular an X-ray image storage film, comprising a laser unit for generating a laser beam and an optical unit for focusing the laser beam on the storage film, wherein the laser beam on the storage film a Focus point forms
  • the invention further relates to a method for reading out information from a storage film.
  • Such Abtastlaser devices are used in devices that are used to read memory sheets.
  • Memory films are now very often used instead of X-ray films for storing, for example, medical image information, in particular X-ray image information.
  • the picture information are read with special read-out devices with Abtastlaser devices from the imaging plates.
  • the storage film is scanned point, line or block by block with a laser beam and the image information radiated from the storage film is detected with a corresponding optical detector and then evaluated by a computer unit. After reading the image information, the image plates can be erased and reused.
  • An apparatus for reading out memory foils is known for example from the document DE 10 2005 046 248 A1 or DE 199 42 21 1 A1.
  • the aforementioned memory films serve to generate latent X-ray images, with special memory particles being provided for this purpose.
  • the structure of such a storage film is known for example from the document DE 198 59 880 A1.
  • the imaging plates have certain properties in terms of resolution, contrast circumference, etc. These characteristics must now be matched to the readout device for the best possible image result. However, this also means that the quality can be impaired when using other storage films, since the read-out device is difficult or impossible to adapt to another storage film. This problem arises in particular when imaging plates of different resolution are to be used with a read-out device.
  • the object of the present invention is to provide a scanning laser device for a reading device, which allows the use of different memory films with the same optimal quality.
  • optical unit has a means for changing, in particular increasing the diameter of the focal point on the storage film.
  • the read-out process to different memory sheets to be able to adapt.
  • the read quality can be kept constant, for example, despite changing the resolution. If, for example, the resolution of the storage film changes, an adjustment can be made by changing the focus point, so that the ratio of useful signal / loss signal remains the same, whereby the useful signal is the area on the memory film which responds to the read-out beam per pixel and loss signal the area that is indeed irradiated by the laser beam when scanning a pixel, but is not active for this purpose.
  • the invention provides a simple way to make a reader much more flexible by being adaptable to memory sheets with different resolution. Also with regard to other properties of the storage film, this adjustability has an influence, such as the contrast extent or the noise ratio.
  • the optical unit comprises a collimator lens and a following in the beam direction biconvex lens, wherein the means preferably has a diaphragm which is arranged between the collimator lens and biconvex lens.
  • the aperture of the aperture can be adjusted for example by the user. Of course, it is also conceivable to provide an automatic adjustment of the aperture.
  • the focal point i. set the area covered or irradiated by the laser beam on the storage sheet. If the lens geometry remains the same, the laser beam is narrowed by the diaphragm, which leads to a shift in the focus and thus also to a change in the area irradiated by the laser beam on the imaging film. In particular, the focus point is increased when the shutter is closed.
  • the incident power of the laser beam on the storage film is lower.
  • the power of the laser beam can be changed by means of a control or regulating device and thus adapted to the change in focus point. For example, if the focal point, i. the laser-irradiated area on the storage film increases, the power of the laser beam per irradiated area is smaller, since the radiation power is initially not increased. To counteract this, it is preferably provided to adjust the power of the laser and in particular to adapt it to such a situation.
  • control unit adjusts the power of the laser beam depending on the size of the diameter of the focal point on the storage film, wherein preferably a corresponding detection unit is provided, which measures the size of the focal point.
  • a scanning laser device for scanning a storage film, in particular an X-ray image storage film, a laser unit for generating a laser beam, an optical unit for focusing the laser beam on the storage film, wherein the laser beam on the Memory Foil forms a focal point, and the optical unit comprises a collimator lens and a following in the beam direction biconvex lens.
  • the optical unit further comprises a means for changing, in particular magnification, which is designed to change the diameter of the focal point on the storage film, in particular to increase / decrease, wherein the means comprises a diaphragm which is arranged between the collimator lens and the biconvex lens and whose diaphragm opening is adjustable by motor control.
  • the laser unit has a control or regulating device, which is designed to adjust the power of the laser beam depending on the size of the diameter of the focal point on the storage film, so that the power per area on the storage film remains within a predefinable value range.
  • the object underlying the invention is also achieved by a method for reading out information, in particular image information, from a storage film, in particular an X-ray image storage film, wherein the method comprises the steps: punctiform irradiation of the storage film with a laser beam to to form a focal point on the storage film, and changing the diameter of the focal point to tune the laser beam on the resolution of the storage film can.
  • a method for reading information, in particular image information, from a storage film, in particular an X-ray image storage film comprising the steps: punctiform irradiation of the storage film with a collimated laser beam which passes through an aperture of a diaphragm to a focal point on the Forming a storage film, changing the diameter of the focal point by varying the aperture of the diaphragm to tune the laser beam to the resolution of the storage film, and adjusting the power of the laser beam such that the power per area in the focal point remains within a predeterminable range of values Diameter of the focal point is changed, so that a response signal of the storage film remains approximately constant.
  • Fig. 1 is a schematic representation of a scanning laser device
  • Fig. 2 is a schematic representation of the scanning laser device of Fig. 1 with a modified aperture.
  • a Abtastlaser device is shown schematically with the elements required for the explanation and generally indicated by the reference numeral 10. It is understood that the Abtastlaser device has other components, which are not required to explain the invention.
  • the scanning laser device 10 is part of a scanning or read-out device, in which a storage film can be used to read the latently present on the storage film image.
  • Readout devices are mainly used in the medical and dental field. However, X-ray images are also used, for example, in the area of material testing, so that reading devices are also used in this area.
  • the scanning laser device 10 comprises a laser unit 12 which can generate a laser beam with a predetermined power.
  • the laser beam 13 generated by the laser unit 12 is directed onto a storage film 14 in order to be able to read out the image information contained on the storage film.
  • an optical unit 16 In the beam path of the laser beam 13 is an optical unit 16 having a collimator lens 18 and a biconvex lens 20.
  • the collimator lens 18 has the task of aligning the laser beam in parallel.
  • the collimated laser beam 13 is then focused in the further beam path through the biconvex lens on the storage film 14, thereby forming on the storage film, a circular focal point 24 having a diameter d. This is indicated graphically in FIG. 1 to the right of the storage film 14.
  • the optical unit 16 further includes a diaphragm 30 which is located between the collimator lens 18 and biconvex lens 20 and in the beam path of the laser beam 13.
  • the aperture 30 is fully open, so that the laser beam passes through the aperture 30 unhindered.
  • Fig. 2 the same Abtastlaser device 10 is now shown, but with a diaphragm 30, the aperture was reduced. This results in only a portion of the laser radiation through the diaphragm 30. This has the result that the focus of the biconvex lens 20 changes, which is clearly visible in Fig. 2. This change now leads to the fact that the focal point 26, that is, the area irradiated by the laser beam 13, increases to a diameter D.
  • the scanning laser device can be adapted to different imaging plates very quickly, without requiring major intervention.
  • the power of the laser unit In order to ensure that the power of the laser beam per unit area arriving at the storage film 14 remains substantially constant, the power of the laser unit must be increased when the aperture is reduced. This can be done via a control unit 36, which is shown schematically in Figs. 1 and 2.
  • This control unit 36 changes the beam power of the laser unit 12, which can be done, for example, depending on the size of the aperture.
  • the size of the diaphragm opening can be detected, for example, via sensors and fed to the control unit 36 as an electrical signal.
  • the size of the aperture is preferably set via a controllable drive, for example a stepping motor, it is possible to dispense with sensors for detecting the aperture, since a signal corresponding to the aperture is supplied by the controllable drive. Depending on this signal, it is possible, for example, to deduce the required power to be set for the laser unit on the basis of, for example, a characteristic which can be stored in a memory.
  • a controllable drive for example a stepping motor
  • control unit 36 controls the laser unit 12 to a higher laser power, while the power is reduced with a reduction in the diameter of the focus point again.
  • the bi-convex lens 20 in addition or as an alternative to the diaphragm 30, it is also conceivable for the bi-convex lens 20 to be displaceable in the beam direction in order to shift the focus in this way, so that the size of the focal point generated on the memory film is changed.
  • the scanning laser device 10 is easily adaptable to different imaging plates by the diameter of the focal point is adjustable. This setting can be done automatically depending on detected measurement signals or manually by the user.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

L'invention concerne un dispositif laser servant à explorer un écran à mémoire, en particulier un écran à mémoire radiographique, comprenant un module laser qui génère un faisceau laser, un module optique qui focalise le faisceau laser sur l'écran à mémoire, le faisceau laser formant un point focal sur l'écran à mémoire. Le module optique comporte moyen permettant de faire varier, en particulier d'agrandir le diamètre du point focal sur l'écran à mémoire.
PCT/EP2013/066219 2012-08-03 2013-08-01 Réglage de focalisation d'un laser d'exploration dans l'appareil WO2014020123A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012015214.0 2012-08-03
DE102012015214.0A DE102012015214A1 (de) 2012-08-03 2012-08-03 Focusverstellung des Abtastlasers im Gerät

Publications (1)

Publication Number Publication Date
WO2014020123A1 true WO2014020123A1 (fr) 2014-02-06

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PCT/EP2013/066219 WO2014020123A1 (fr) 2012-08-03 2013-08-01 Réglage de focalisation d'un laser d'exploration dans l'appareil

Country Status (2)

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DE (1) DE102012015214A1 (fr)
WO (1) WO2014020123A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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CN110477874A (zh) * 2019-09-25 2019-11-22 天逸瑞狮（苏州）口腔医疗科技股份有限公司 一种口内影像扫描仪

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* Cited by examiner, † Cited by third party
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CN110007472B (zh) * 2019-05-24 2023-09-26 平顶山学院 可自动调节的激光扩/缩束器

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DE2840733A1 (de) * 1977-09-21 1979-03-29 Canon Kk Lichtabtastvorrichtung
JPS59104619A (ja) * 1982-12-08 1984-06-16 Canon Inc 光走査装置
JPS60220309A (ja) * 1984-04-18 1985-11-05 Ricoh Co Ltd 光走査光学系
JPS6125366A (ja) * 1984-07-13 1986-02-04 Fujitsu Ltd 電子写真式プリンタ
JP2003195172A (ja) * 2001-12-25 2003-07-09 Olympus Optical Co Ltd 走査型レーザー顕微鏡
US20100079834A1 (en) * 2008-09-29 2010-04-01 Jerman John H Two frequency resonantly excited mems mirror for diode-laser marker

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110477874A (zh) * 2019-09-25 2019-11-22 天逸瑞狮（苏州）口腔医疗科技股份有限公司 一种口内影像扫描仪

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