EP0728326A1 - Lecteur de microfiches - Google Patents
Lecteur de microfichesInfo
- Publication number
- EP0728326A1 EP0728326A1 EP95900815A EP95900815A EP0728326A1 EP 0728326 A1 EP0728326 A1 EP 0728326A1 EP 95900815 A EP95900815 A EP 95900815A EP 95900815 A EP95900815 A EP 95900815A EP 0728326 A1 EP0728326 A1 EP 0728326A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microfiche
- light
- diodes
- reader according
- support surface
- 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- Withdrawn
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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/10—Projectors with built-in or built-on screen
- G03B21/11—Projectors with built-in or built-on screen for microfilm reading
- G03B21/115—Projectors with built-in or built-on screen for microfilm reading of microfiches
-
- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
Definitions
- the present invention relates to a microfiche reader intended to project by means of an appropriate optical arrangement a light beam emitted by a light source on a selected view of a microfiche for viewing it on a projection surface or screen, comprising a holder microfiche movable in translation relative to a projection objective, the microfiche being inserted between two transparent glass plates, one of the plates being able to be separated from the other, for example by pivoting, to allow the microfiche to be put in place or its withdrawal.
- the light source of this device consists in most cases of a halogen lamp with dichroic reflector of low voltage and of a high light power.
- this arrangement requires an electrical voltage transformation circuit to supply the lamp from the current of the electrical network and, moreover, the significant heating of the lamp requires that it be placed in a suitable housing relatively distant from the microfiche holder. and properly ventilated.
- the invention aims to remedy these drawbacks by proposing a microfiche reader, of the aforementioned type, characterized in that it comprises a light source constituted by a set of high-light emitting diodes, arranged on a support surface capable of focusing. the luminous flux emitted by the diodes on the elements of the optical arrangement of the device.
- the light-emitting diodes are advantageously juxtaposed over the extent of the support surface, but they can naturally be arranged in any other shape configuration, for example in concentric rings on the support surface.
- Said support surface can be flat or curved and preferably concave so as to focus the light emission as much as possible.
- Reader LEDs provide thus together sufficient light power, their number and their surface area being determined for this purpose. They are supplied directly by the mains current and with a global heating much less than that of a conventional halogen lamp, for an equivalent light power. Similarly, energy consumption is significantly reduced. In addition, they are inexpensive, even in number and their lifespan is significantly longer (about 10,000 hours per 2,000 for a halogen lamp).
- the reader according to the invention does not require an expensive electrical current transformation circuit or a lamp cooling system (generally a cooling system with ventilation fins on conventional readers). Furthermore, the light source can be located closer to the microfiche holder, which reduces the overall size of the device.
- FIG. 1 is a diagrammatic view, with cutaway of the light source device, of a microfiche reader according to the invention
- Figure 2 is an enlarged sectional view of the optical device of this reader
- Figures 3 and 4 show alternative embodiments.
- the microfiche reader As shown in FIG. 1, the microfiche reader according to the invention comprises a lower base 1, an upper display screen 3 fixed on the base and a median microfiche holder device 5 mounted on the upper flat surface of the base.
- the objective 7 for focusing the image on the screen is arranged just above the microfiche holder 5.
- the latter, of the type with conventional transparent glass plates 9 is mounted movable in the plane of the objective so as to allow the selection of the views of the displayed microfiche 11 as desired.
- the lower base 1 houses the light source 13, eradicating a light beam 14, a mirror 15 for returning the light beam emitted and a condenser lens 17 disposed vertically above the mirror 15. This converges the light beam on the objective 7 through the selected view of the microfiche.
- the resulting image beam is again reflected on a second deflecting mirror 19 (housed at the lower part of the screen) then on a third mirror 21, arranged at the rear part of the screen.
- the visualized image of the selected view appears to the operator through the front face 23 of the screen.
- the light source 13 and the first deflection mirror 15 are mounted on the opposite folded end parts of the same horizontal plate 25, oriented vertically and at 45 ° from the vertical respectively.
- the light source consists of a plate element 31 fixed vertically on said plate 25 and the surface of which is provided with high-light emitting diodes 33 arranged side by side.
- the plate can be a disc 60 mm in diameter and receive on its surface about a hundred light-emitting diodes 5 mm in diameter. These diodes have a light power of approximately 75 cd each under a voltage of 11 Volts. They are supplied in groups of 20 in series on the network voltage.
- the associated reflecting mirror 15, oriented at 45 ° from the vertical, integral with the plate makes it possible to vertically return the light beam emitted by all of the diodes towards the objective.
- This mirror is a disc with a diameter equal to at least of the plate diameter.
- laser diodes with high light output can also be used, as well as diodes supplied at a voltage of 220 volts, mounted in parallel on the grid current.
- the element for supporting the diodes may have a concave shape which alone forms with a suitable curvature a focusing element 35 of the emitted light beam.
- the focused beam can also be projected vertically converging (FIG. 4), without the first deflection mirror 15 and without the above-mentioned condenser 17, directly on the objective through the selected image of the microfiche.
- This concave surface has a focal point for focusing the light beams which is substantially in correspondence with the focal point of the objective.
- the first deflection mirror 15 can be eliminated, whatever the shape of the support surface of the diodes, the emitted light beam being channeled in the axis of the objective practically entirely on the condenser, which however remains necessary for a flat support surface, as shown in FIG. 3.
- the light-emitting diodes can be grouped on a support surface outside of a specific focusing surface of the emitted flux, for example on a small sphere arranged at the focal point of a parabolic focusing surface causing the light beam to converge. directly on the lens.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9313364A FR2712400B1 (fr) | 1993-11-09 | 1993-11-09 | Lecteur de microfiches. |
FR9313364 | 1993-11-09 | ||
PCT/FR1994/001304 WO1995013563A1 (fr) | 1993-11-09 | 1994-11-08 | Lecteur de microfiches |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0728326A1 true EP0728326A1 (fr) | 1996-08-28 |
Family
ID=9452679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95900815A Withdrawn EP0728326A1 (fr) | 1993-11-09 | 1994-11-08 | Lecteur de microfiches |
Country Status (5)
Country | Link |
---|---|
US (1) | US5647654A (fr) |
EP (1) | EP0728326A1 (fr) |
JP (1) | JPH09505152A (fr) |
FR (1) | FR2712400B1 (fr) |
WO (1) | WO1995013563A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH104489A (ja) * | 1996-04-19 | 1998-01-06 | Nikon Corp | 画像入力装置 |
US6301398B1 (en) | 2000-02-15 | 2001-10-09 | Cyberecord, Inc. | Apparatus and method of processing microfiche images |
US8269890B2 (en) * | 2007-05-15 | 2012-09-18 | E-Image Data Corporation | Digital microform imaging apparatus |
US9158983B2 (en) | 2010-07-08 | 2015-10-13 | E-Image Data Corporation | Microform word search method and apparatus |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1263249A (en) * | 1968-07-31 | 1972-02-09 | Scottish Instr Ltd | Portable microfiche reader |
US3733121A (en) * | 1969-12-15 | 1973-05-15 | Seaco Computer Display Inc | Microfiche reader |
US3944350A (en) * | 1972-11-28 | 1976-03-16 | Personal Communications, Inc. | Microfiche and reader |
DE2643287A1 (de) * | 1976-09-25 | 1978-03-30 | Agfa Gevaert Ag | Mikrofilm-lesegeraet |
US4229085A (en) * | 1977-03-10 | 1980-10-21 | Canon Kabushiki Kaisha | Film reader |
GB2098714B (en) * | 1980-06-04 | 1984-08-22 | Tranilamp Ltd | Led cluster assembly |
US4805087A (en) * | 1984-09-28 | 1989-02-14 | Q & L Corp., Inc. | Selective microfiche display equipment |
JPH0416447Y2 (fr) * | 1985-07-22 | 1992-04-13 | ||
JPS62124781A (ja) * | 1985-11-25 | 1987-06-06 | Stanley Electric Co Ltd | 屋外用ledランプ |
-
1993
- 1993-11-09 FR FR9313364A patent/FR2712400B1/fr not_active Expired - Fee Related
-
1994
- 1994-11-08 US US08/640,837 patent/US5647654A/en not_active Expired - Fee Related
- 1994-11-08 JP JP7513640A patent/JPH09505152A/ja active Pending
- 1994-11-08 WO PCT/FR1994/001304 patent/WO1995013563A1/fr not_active Application Discontinuation
- 1994-11-08 EP EP95900815A patent/EP0728326A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9513563A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH09505152A (ja) | 1997-05-20 |
US5647654A (en) | 1997-07-15 |
WO1995013563A1 (fr) | 1995-05-18 |
FR2712400B1 (fr) | 1996-02-16 |
FR2712400A1 (fr) | 1995-05-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19960422 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES GB IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19961227 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19981111 |