EP0873958A1 - Dispositif de lecture de film du type a transmission - Google Patents

Dispositif de lecture de film du type a transmission Download PDF

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Publication number
EP0873958A1
EP0873958A1 EP97940339A EP97940339A EP0873958A1 EP 0873958 A1 EP0873958 A1 EP 0873958A1 EP 97940339 A EP97940339 A EP 97940339A EP 97940339 A EP97940339 A EP 97940339A EP 0873958 A1 EP0873958 A1 EP 0873958A1
Authority
EP
European Patent Office
Prior art keywords
film
reading apparatus
driving
driven
main body
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97940339A
Other languages
German (de)
English (en)
Other versions
EP0873958A4 (fr
Inventor
Haruo Kotani
Tadashi Iwasa
Makoto Okazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nishimoto Sangyo Co Ltd
Original Assignee
Nishimoto Sangyo Co Ltd
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
Priority claimed from JP26529096A external-priority patent/JP2915361B2/ja
Priority claimed from JP26087797A external-priority patent/JPH1183728A/ja
Application filed by Nishimoto Sangyo Co Ltd filed Critical Nishimoto Sangyo Co Ltd
Publication of EP0873958A1 publication Critical patent/EP0873958A1/fr
Publication of EP0873958A4 publication Critical patent/EP0873958A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller

Definitions

  • the present invention relates to a reading apparatus of transmission type film. More particularly, it relates to a reading apparatus of transmission type film simplified in the laser optical system.
  • a laser beam c emitted from a semiconductor laser device a and focused by a focusing lens b is reflected by a polygonal mirror d, and a film f surface held in a flat plane is scanned (main scanning).
  • an F- ⁇ lens g is interposed between the polygonal mirror d and film f, and to correct plane tilting, moreover, a cylindrical lens h is disposed after the F- ⁇ lens g.
  • the film f is conveyed, for example, downward while the deflection in the main scanning direction of the film f is being suppressed by a pair of cylindrical driving rollers i, i and a pair of cylindrical driven rollers j, j as shown in Fig. 19.
  • This is sub-scanning of film f.
  • it is designed to drive by using a set of combination of driving roller i and driven roller j as shown in Fig. 20.
  • reference code k denotes a scanning unit on which an optical system such as polygonal mirror d is mounted.
  • the sub-scanning mechanism of film f is simplified by using cylindrical rollers i, j, but, to the contrary, the optical characteristic depends on the F- ⁇ lens g, and the F- ⁇ lens g is expensive, and the cost of the reading apparatus is raised.
  • a reading apparatus is proposed to compose a film conveying mechanism, in which the film f surface is an arc surface along the main scanning direction, and sub-scanning is realized by combination of barrel roller m and drum roller n.
  • the film f is conveyed by such conveying mechanism, although deflection in main scanning direction of the film f is suppressed, sub-scanning is not smooth because the peripheral speed differs between the central part and circumferential part of the rollers m, n.
  • It is a first aspect of the invention to present a reading apparatus of transmission type film comprising a film conveying means for conveying a film on an arc surface similar to a free deflection curve of film.
  • the first aspect of the invention more specifically, relates to a reading apparatus of transmission type film comprising a film holding means having an arc surface similar to a free deflection curve of film, and a film conveying means having a driving roller disposed beneath the arc surface, a driven roller disposed above the arc surface corresponding to the driving roller, for bringing the driving member of the driving roller into contact with the film back side and the driven member of the driven roller into contact with the film face side.
  • the driving member of the driving roller is a pair of driving wheels disposed at a specific interval on a drive shaft
  • the driven member of the driven roller is a pair of driven wheels mounted on a shaft member corresponding to the driving wheels.
  • the abutting surface of the driving wheels and driven wheels with the film is an arc surface.
  • the driven roller is free to ascend and descend.
  • the first aspect of the invention further comprises a box-shaped main body composed of parallel ceiling member and bottom member having the longitudinal direction in the scanning direction of laser beam constituted by combining flat members, a pair of photo detecting means disposed at proper positions on planes parallel to the scanning plane of laser beam of the main body, and a focusing device for film density detector forming a ceiling member contacting with the back side of a shell member on which the film of the box-shaped main body is mounted and conveyed, along the back side of the shell member, and forming a slit along the scanning direction of the laser beam for moving the laser beam forward into the main body in this ceiling member.
  • a box-shaped main body composed of parallel ceiling member and bottom member having the longitudinal direction in the scanning direction of laser beam constituted by combining flat members, a pair of photo detecting means disposed at proper positions on planes parallel to the scanning plane of laser beam of the main body, and a focusing device for film density detector forming a ceiling member contacting with the back side of a shell member on which the film of the
  • the slit is covered, for example, with a scattering film for scattering the light appropriately, and a coating is formed inside of the box-shaped main body for preventing absorption of laser beam getting into the main body.
  • the first aspect of the invention further comprises film width aligning means.
  • the width aligning means has a width aligning member free to move back and forth in the film width direction disposed oppositely.
  • the film conveying device in the second aspect of the invention comprises film holding means having an arc surface similar to a free deflection curve of film, a driving roller disposed beneath the arc surface, and a driven roller disposed above the arc surface corresponding to the driving roller, in which the driving member of the driving roller contacts with the film back side, and the driven member of the driving roller contacts with the film face side.
  • each set is disposed oppositely across the main scanning surface.
  • the driving member of the driving roller is a pair of driving wheels disposed at a specific interval on a drive shaft
  • the driven member of the driven roller is a pair of driven wheels mounted on a shaft member corresponding to the driving wheels.
  • the abutting surface of the driving wheels and driven wheels with the film is an arc surface.
  • the driven roller is free to ascend and descend.
  • the slit is covered with a scattering film for scattering the light appropriately.
  • a coating is formed inside of the box-shaped main body for preventing absorption of laser beam getting into the main body.
  • the first aspect of the invention is thus constituted, without using F- ⁇ lens in the scanning unit, the reading precision of transmission type film is enhanced.
  • the film runs along the arc surface only by mounting the film on the arc surface. Accordingly, it is not necessary to move the film along the conveying surface by pressing by the driving roller and driven roller, so that the constitution of the driving roller and driven roller may be simplified.
  • the film conveyed nearly in an arc form can be kept nearly in tight contact over the entire width, and the scanning speed of laser beam may be constant regardless of the focusing device for film concentration detector, and the reading apparatus of transmission type film on which it is mounted is not increased in size.
  • Fig. 1 is an essential perspective view of a reading apparatus of transmission type film of the invention.
  • Fig. 2 is a lateral sectional view of the reading apparatus.
  • Fig. 3 is a left side view showing a partial section of the reading apparatus.
  • Fig. 4 is a sectional view of a right side leading end portion of the reading apparatus.
  • Fig. 5 is a schematic diagram of a film conveying mechanism.
  • Fig. 6 is an explanatory diagram showing the circumferential shape of driving wheel and driven wheel.
  • Fig. 7 is an explanatory diagram of disposing method of driving wheel and driven wheel, in which the extension line of the central line of the driving wheel and driven wheel passing through the center of curvature of the arc table in (a), and it is vertical in (b).
  • Fig. 8 is a schematic diagram of a link mechanism used in the reading apparatus.
  • Fig. 9 is a perspective view of a focusing device for film density detector used in the reading apparatus.
  • Fig. 10 is its perspective exploded view.
  • Fig. 11 is a perspective view showing the focusing device separated from the arc table.
  • Fig. 12 is a perspective exploded view of width aligning mechanism of film.
  • Fig. 13 is an operation explanatory diagram of a reading apparatus of the invention, showing an initial state of the reading apparatus.
  • Fig. 14 is the operation explanatory diagram, showing a film inserted state.
  • Fig. 15 is the operation explanatory diagram, showing a lowered state of an upper guide.
  • Fig. 16 is the operation explanatory diagram, showing a state of the film end being pulled in to a position dislocated from the laser beam.
  • Fig. 17 is the operation explanatory diagram, showing a discharged state of a film being read.
  • Fig. 18 is an explanatory diagram of an optical system in a conventional reading apparatus.
  • Fig. 19 is a schematic diagram of a film conveying device in the same reading apparatus.
  • Fig. 20 is a schematic diagram of other example of the conventional reading apparatus.
  • Fig. 21 is a schematic diagram of a different example of the conventional reading apparatus.
  • FIG. 1 A perspective view of essential parts of a reading apparatus of transmission type film for medical use (hereinafter called reading apparatus) R in an embodiment of the invention is given in Fig. 1, and a front sectional view, a left side view, and a partial right side view of the reading apparatus R are shown in Fig. 2, Fig. 3, and Fig. 4, respectively.
  • This reading apparatus R comprises, as shown in the drawings, a scanning unit U, an arc table 10 having an arc surface 11 in an arc form along the main scanning direction L of a film F, a film conveying mechanism 20 for sub-scanning of film F mounted on this arc surface 11, and a focusing device for film density detector (hereinafter called focusing device) 30, as principal constituent elements.
  • focusing device for film density detector
  • the scanning unit U is similar to the conventional scanning unit except that the F- ⁇ lens is not provided.
  • the arc table 10 has the arc surface 11 similar to a free deflection curve of the film F formed when supporting the end of the film F orthogonal to the main scanning direction L.
  • the radius of curvature of the arc surface 11 is about 300 mm.
  • the film conveying mechanism 20 is composed of a first drive unit 21 and a second drive unit 22 disposed across the main scanning surface S as shown in Fig. 1, and each one of the first drive unit 21 and second drive unit 22 is a combination of a driving roller 23 and a driven roller 24 similarly composed as shown in Fig. 5.
  • This driving roller 23 is composed of a pair of driving wheels 23b, 23b in a plate form disposed at a specific interval on a drive shaft 23a driven, for example, by a motor through a power transmission mechanism
  • the driven roller 24 is composed of a pair of driven wheels 24b, 24b in a plate form disposed on a shaft 24a held rotatably on an elevatable member through proper means corresponding to the driving wheels 23b, 23b.
  • the outer circumferences 23c, 24c of the driving wheel 23 and driving wheel 24b are arc surfaces as shown in Fig. 6. Since the outer circumferences 23c, 24c of the driving wheel 23b and driven wheel 24b are thus formed, useless deformation of the film F when the driving wheel 23b and driven wheel 24b pinch the film F is prevented.
  • driving roller 23 is disposed beneath the arc table 10 so that the outer circumference 23c of the driving wheel 23b may contact with the back side of the film F
  • driven roller 24 is disposed above the arc table 10 so that the outer circumference 24c of the driven wheel 24b may contact with the face side of the film F.
  • a window 12 is provided so that the driving wheel 23b may project from the surface of the arc surface 11. In this case, as shown in Fig.
  • a power transmission mechanism 25 for driving the driving roller 23 is, as shown in Fig. 2 and Fig.
  • An elevatable member holding the driven roller 24 is specifically an upper guide 26 moved up and down by a link mechanism.
  • This upper guide 26 comprises, as shown in Fig. 3 to Fig. 5, a first holder 26a holding the driven roller 24 of the first drive unit 21, a second holder 26b holding the driven roller 24 of the second drive unit 22, an upper guide main body 26c holding the first holder 26a and second holder 26b, a link 26d for moving up and down the guide main body 26c, and a rotary disk 26e, and the upper end of the link 26d is joined by pin at a proper position of the upper guide main body 26c, and the lower end is joined by pin at an outer circumference of the rotary disk 26e.
  • This link 26d is specifically composed of an upper link 26f and a lower link 26g, and the lower end of the upper link 26f and the upper end of the lower link 27g are rotatably joined (see Fig. 8).
  • a slot 26h is formed at the leading end of the upper link 26f, and a pin 26i planted on the guide main body 26c is slidably engaged with this slot 26h.
  • a proper position in the center of the upper link 26f is oscillatably fitted by pin.
  • the lower end of the lower link 26g is rotatably joined by pin to the rotary disk 26e as mentioned above.
  • the upper guide 26 As the upper guide 26 is thus constituted, when the rotary disk 26e is rotated by motor M2, the upper guide main body 26c is moved up or down, and the first holder 26a and second holder 26b held by it are also moved up or down. That is, the driven rollers 24, 24 ascend or descend.
  • the mechanism for moving up and down the driven rollers 24 is not limited to the above constitution, but other proper means may be used, and, for example, it may be designed to move up and down by chain drive.
  • the focusing device 30 comprises, as shown in Fig. 9 through Fig. 11, a main body 40, and a photo detector 50 disposed at a proper position of this main body.
  • the main body 40 is, as shown in Fig. 10 and Fig. 11, is a box (focusing box) 40A of rectangular section, with the top 40a formed in an arc form in a curvature corresponding to the curvature of the arc surface 11, so as to be mounted on the back side 11a of the arc surface 11a along the width direction of the arc table 10.
  • This box 40A is formed by assembling, as shown in Fig.
  • a ceiling plate 41 formed in a curved surface corresponding to the curved surface of the arc surface 11 abutting against the back side 11a of the arc surface 11, a right side plate 42, a left side plate 43, a front plate 44 having the upper end formed in an arc along the inner side of the ceiling plate 41, a rear plate 45 having the upper end formed in an arc along the inner side, and a bottom plate 46 formed in the curved surface in a concentric circle with the ceiling plate 41.
  • the longitudinal direction is based on the conveying direction of the film F (see arrow in Fig. 11).
  • These plates 41, 42, 43, 44, 45, 46 are assembled, for example as shown in Fig. 10, by forming assembly plates 42a, 43a for assembling the ceiling plate 41 outward to the upper end of the right side plate 42 and left side plate 43 integrally in a proper size, fastening these assembly plates 42a, 43a formed outward from both ends of the ceiling plate 41 corresponding to these assembly plates 42a, 43a with screws, forming assembly plates 42b, 43b for assembling the front plate 44 outward to the front end of the right side plate 42 and left side plate 43 integrally in a proper size, fastening the both ends of the front plate 44 to the assembly plates 42b, 43b with screws, having the upper end abutting against the inner side of the ceiling plate 41, forming assembly plates 42c, 43c for assembling the rear plate 45 outward to the rear end of the right side plate 42 and left side plate 43 integrally in a proper size, fastening the both ends of the rear plat 45 to these assembly plates 42c, 43c with screws, having the upper end
  • focusing box 40A is assembled in the back side 11a of the laser beam irradiation position from the scanning unit U of the arc surface 11 of the arc table 10, and light is focused. That is, the light passing through a slit 13 formed at the laser beam irradiation position from the scanning unit U of the arc surface 11 penetrates and invades a slit 41b formed corresponding to the slit 13 in the ceiling plat 41 in the focusing box 40A, and the laser beam invading into the focusing box 40A is irregularly reflected repeatedly in the focusing box 40A, and enters a photo detector 50 provided in a pair of mounting members 48 formed at a proper interval in the rear plat 45, and the laser beam entering the photo detector 50 is converted into an electric signal same as in prior art, and is sent out into a density detector (not shown).
  • the density detector detects, same as in prior art, the density of the laser beam passing through the film F by the signal entering from the photo detector 50.
  • the focusing box 40A is assembled into the arc table 10 by, for example, stopping the screws assembling the ceiling plate 41 into the side plates 42, 43 into the arc table 10 (see Fig. 11).
  • the inside of the focusing box 40A is coated in order to focus the laser beam entering the focusing box 40A by decreasing the absorption in the inside of the focusing box 40A.
  • a water-based acrylic paint and barium sulfate are mixed at 1 to 10 by volume, and dissolved in purified water to prepare a creamy paint, which is applied in multiple layers. This coating is applied while properly polishing with sandpaper so as to remove extra undulations from the surface.
  • the coating procedure is as follows.
  • Fig. 11 and Fig. 12 show a width aligning mechanism 60 for adjusting the width direction position of the film F used in this embodiment.
  • the width aligning mechanism 60 comprises a width aligning member 61, a drive mechanism 62 for driving the width aligning member 61, and a mounting member 63 for mounting the width aligning member 61 on the drive mechanism 62, and a set of confronting width aligning mechanisms 60 is disposed in the arc table 11 across a specific interval (see Fig. 11). As thus disposed width aligning members 61 move along the guide groove 14 provided in the arc surface 11, the film F is aligned in width.
  • the drive mechanism 62 specifically comprises a flexible rack 64 made of synthetic resin, and a motor (not shown) having a pinion for driving the rack 64.
  • the rack 64 is slidably provided in a guide 15 disposed at a proper position of the back side 11a of the arc surface 11.
  • reference numeral 65 is a bolt for rotatably fixing the width aligning member 61
  • 66 is a nut to be combined with this bolt
  • 67 is a bolt for fixing the mounting member 63 to the rack 64
  • 68 is a spacer nut to be combined with the bolt 64.
  • the F- ⁇ lens in the optical system can be omitted. Therefore, the cost of the reading apparatus R including the scanning unit U is lowered.
  • the width of the focusing device 30 may be a minimum required limit, and the scanning speed with the laser beam may be constant in the entire irradiation area so as to be focused by the focusing device 30.
  • the precision of concentration detection can enhanced while preventing useless increase in size of the reading apparatus R.
  • the focusing box 40A composing the focusing device 30 is formed by combining flat plates, manufacturing is easy, including coating of inside.
  • the film conveying mechanism is simplified, the F- ⁇ lens in the optical system can be omitted. Therefore, the cost of the reading apparatus including the scanning unit U is lowered.
  • the width of the focusing device for film density detector may be a minimum required limit, and moreover the scanning speed with the laser beam may be constant in the entire irradiation area so as to be focused by the focusing device for film density detector.
  • the precision of concentration detection can enhanced while preventing useless increase in size of the reading apparatus.
  • the focusing box composing the focusing device for film density detector is formed by combining flat plates, manufacturing is easy, including coating of inside.

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  • Facsimile Scanning Arrangements (AREA)
EP97940339A 1996-09-12 1997-09-10 Dispositif de lecture de film du type a transmission Withdrawn EP0873958A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP265290/96 1996-09-12
JP26529096A JP2915361B2 (ja) 1996-09-12 1996-09-12 フィルム搬送装置
JP260877/97 1997-09-08
JP26087797A JPH1183728A (ja) 1997-09-08 1997-09-08 フィルム濃度検出器用集光装置
PCT/JP1997/003197 WO1998011009A1 (fr) 1996-09-12 1997-09-10 Dispositif de lecture de film du type a transmission

Publications (2)

Publication Number Publication Date
EP0873958A1 true EP0873958A1 (fr) 1998-10-28
EP0873958A4 EP0873958A4 (fr) 1999-12-01

Family

ID=26544794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97940339A Withdrawn EP0873958A4 (fr) 1996-09-12 1997-09-10 Dispositif de lecture de film du type a transmission

Country Status (2)

Country Link
EP (1) EP0873958A4 (fr)
WO (1) WO1998011009A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6804032B2 (en) * 2001-03-16 2004-10-12 Fuji Photo Film Co., Ltd. Image recording device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622150A (en) * 1969-10-20 1971-11-23 Potlatch Forests Inc Sheet conveying and stacking apparatus
US3809806A (en) * 1972-10-18 1974-05-07 Columbia Broadcasting Syst Inc Banding correction system for film recording apparatus
US4686541A (en) * 1984-09-28 1987-08-11 Societe Europeenne De Propulsion High resolution image restitution apparatus for a plane film supplied from a coil and cut into film-portions
US4717938A (en) * 1985-11-15 1988-01-05 Mita Industrial Co., Ltd. Paper transferring apparatus for a copying machine
US5312108A (en) * 1992-04-10 1994-05-17 Brother Kogyo Kabushiki Kaisha Paper discharge device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424029A (en) * 1977-07-26 1979-02-23 Ricoh Co Ltd Deflect on detector for transport belt
JPH0386568A (ja) * 1989-08-31 1991-04-11 Canon Inc 記録装置
US5342133A (en) * 1992-12-23 1994-08-30 Hewlett-Packard Company Paper moving system for a printer/plotter
JPH06199433A (ja) * 1992-12-28 1994-07-19 Canon Inc シート材自動給紙装置
JPH08301497A (ja) * 1995-05-09 1996-11-19 Brother Ind Ltd 画像形成装置における用紙案内装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622150A (en) * 1969-10-20 1971-11-23 Potlatch Forests Inc Sheet conveying and stacking apparatus
US3809806A (en) * 1972-10-18 1974-05-07 Columbia Broadcasting Syst Inc Banding correction system for film recording apparatus
US4686541A (en) * 1984-09-28 1987-08-11 Societe Europeenne De Propulsion High resolution image restitution apparatus for a plane film supplied from a coil and cut into film-portions
US4717938A (en) * 1985-11-15 1988-01-05 Mita Industrial Co., Ltd. Paper transferring apparatus for a copying machine
US5312108A (en) * 1992-04-10 1994-05-17 Brother Kogyo Kabushiki Kaisha Paper discharge device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9811009A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6804032B2 (en) * 2001-03-16 2004-10-12 Fuji Photo Film Co., Ltd. Image recording device

Also Published As

Publication number Publication date
EP0873958A4 (fr) 1999-12-01
WO1998011009A1 (fr) 1998-03-19

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