CA1044304A - Method and apparatus for detecting data on a photographic recording medium - Google Patents
Method and apparatus for detecting data on a photographic recording mediumInfo
- Publication number
- CA1044304A CA1044304A CA223,993A CA223993A CA1044304A CA 1044304 A CA1044304 A CA 1044304A CA 223993 A CA223993 A CA 223993A CA 1044304 A CA1044304 A CA 1044304A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- light
- frame
- recording medium
- photographic recording
- 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.)
- Expired
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
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
- G03B27/583—Handling microfiche
-
- 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
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/46—Projection printing apparatus, e.g. enlarger, copying camera for automatic sequential copying of different originals, e.g. enlargers, roll film printers
- G03B27/47—Projection printing apparatus, e.g. enlarger, copying camera for automatic sequential copying of different originals, e.g. enlargers, roll film printers at different positions of the same sheet, e.g. microfiche
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/221—Machines other than electrographic copiers, e.g. electrophotographic cameras, electrostatic typewriters
- G03G15/223—Machines for handling microimages, e.g. microfilm copiers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Disclosed is a method and apparatus for detecting data recorded at a predetermined position on a photographic recording medium. The apparatus includes signal-light projection means for projecting light to the predetermined position on the photo-graphic recording medium and signal-light detection means posi-tioned to receive and detect the intensity of the signal light leaving the photographic recording medium. The magnitude of the signal light leaving the photographic recording medium is effected by the data recorded at the predetermined position.
In its preferred embodiment, the apparatus is an exposed-frame detector for detecting whether a particular frame on a photo-graphic recording medium having a plurality of discrete frames has been exposed. The apparatus includes mask means for pro-ducing a black border on each frame, the black border being opaque and reflecting the signal light at a reduced predeter-mined intensity. The signal-light detection means measures the reduced intensity of signal light and can inform the operator, though conventional electric circuitry, that the particular frame has already been imaged.
Disclosed is a method and apparatus for detecting data recorded at a predetermined position on a photographic recording medium. The apparatus includes signal-light projection means for projecting light to the predetermined position on the photo-graphic recording medium and signal-light detection means posi-tioned to receive and detect the intensity of the signal light leaving the photographic recording medium. The magnitude of the signal light leaving the photographic recording medium is effected by the data recorded at the predetermined position.
In its preferred embodiment, the apparatus is an exposed-frame detector for detecting whether a particular frame on a photo-graphic recording medium having a plurality of discrete frames has been exposed. The apparatus includes mask means for pro-ducing a black border on each frame, the black border being opaque and reflecting the signal light at a reduced predeter-mined intensity. The signal-light detection means measures the reduced intensity of signal light and can inform the operator, though conventional electric circuitry, that the particular frame has already been imaged.
Description
.
.~443Q4 ~he present invention relates generally to systems for photographically storing data, and more particularly, to an apparatus for detecting data recorded at a predetermined position on a electrophotographic film. ~ -Stimulated by the costs incurred in storing the ever-increasing ~olume of documentary material which is presently being generated, considerable effort has been expended in the design and development of various electrophotographic and other data storage and retrieval systems. Particular emphasis has been placed on the design of microphotographic systems which may be used to decrease the physical bulk of such stored materials without sacrificing file retrieval and/or copy re-production capabilities. `
A particularly desirable microphotographic copying l`
system has been developed which records data from documents --upon discrete frames of a multi-frame microfiche. This type of microfiche is a transparent electrophotographic film having a substrate of transparen~ material, such as five mil polyester base, with a thin transparent conductive layer coated thereon ;~
as well as an additional outer layer of a suitable transparent photoconductive material. Any number of various films in the ;~ art may be utilized with equal efficiency in this type of apparatus, such as those disclosed in U.S. Patents Nos.
3,290,147; 3~314,788; and 3,615,404.
~ .
- ~.
3~ ~
An operator places a microfiche within the photo-copying machine and sequentially records images of documents on individual frames in the microfiche. The number of frames in a microfiche might be sixty or more, and it is common for the operator to record document information on several of the frames and then remove the microfiche for storage until later information is desired to be recorded on other frames of the microfiche. When the partially imaged microfiche is returned to the copying machine for further recording of docu-ment information, the operator must selectively position thefirst unimaged frame which sequentially follows the last imaged frame onto the imaging optical axis. While this can be done by the operator not~ng the position of the last imaged frame and pressing an indexing control button to move the next frame onto position, this method is time consuming and subject to error. If the operator erroneously selects a previously imaged frame and proceeds to project a new image upon that frame, he could superimpose additional data upon the frame, perhaps re-sulting in obl~teration of the previous image.
Therefore, it is an object of the invention to pro-vide an apparatus for detecting information, in general, re-corded on a film and particularly information which indicates whether a selected frame has already been imaged.
The apparatus of the invention employs the light transmitting and reflecting propertie~ of 1he photoconductive layer of a microfiche. Specifically, the surface of the photo-conductive layers used in transparent electrophotographic re-cording mediums specularly reflect a beam of light from the surface when undeveloped with toner particles. However, when the photoconductive surface has been electrostatically charged ,: , ~ . . .
.: - . - . ,. ~ .
..
,~ - . . .. : - :
,~., - ' ' ~ 3~
and exposed to a light pattern and developed with toner parti-cles, such as carbon particles, the dark toned areas signifi-cantly reduce the light transmission and reflecting properties of the photoconductive layer. Thus, the magnitude or intensity of the light reflected from or passed through the toned area on the photoconductive layer will be significantly reduced.
The invention provides in an apparatus for selective-ly imaging discrete frames on a photographic recording medium having a plurality of frames thereon and upon which imaging is accomplished by projecting an illuminated image from a document through a lens and onto the selected frame on the photographic recording medium, an exposed frame detector comprising signal-light projection means for projecting light to a predetermined position o~ each frame of the photographic recoFding medium;
signal-light detection means positioned to receive the signal light leaving the photographic recording medium and for detect-ing the magnitude of the signal light leaving the photographic recording medium; and means within the apparatus for causing the predetermined position of each frame to change its optical prop-erties upon developing an image on the frame, whereby the magni-tude of the signal light received by the signal-light detection means is reduced. -Figure 1 is a diagrammatic sectional view showing an electrophotographic recording apparatus within which the inven- -; 25 tion is employed.
Figure 2 is a plan view of a microfiche useful with the invention, illustrating several exposed frames.
Figure 3 is an enlarged partial view of an imaged frame of the microfiche illustrated in Figure 2.
The electrophotographic recording apparatus in which the present invention is preferably used is diagramma--; tically illustrated in Figure 1. The apparatus includes an enclosure 10 having top panel with a transparent copyboard 15 upon which the document 16 to be copied is placed. Within the : -4-.
- ~$ ~ t'~
enclosure 10, is a projection lamp 17, which reflects a light off of document 16 onto mirror 14 where the image is - projected along imaging optical axis 18, through a lens 19 mounted in a charge and image module 13, and onto the se-lected frame of a microfiche 12. Within the charge and image module 13 is a corona charging needle 20, which is charged by a conventional high voltage potential ~not shown) to produce a corona and electrostatically charge the photoconductive layer of the frame positioned against the module 13. The charge and image module 13 includes ma~k 21, forming an opening 22 against 4 which the selected frame on the microfiche 12 is positioned.
After charging, the light image from the document is projected onto the photoconductive layer of the frame being imaged to pattern dissipate the charge and produce a latent electrostatic image. The imaged frame can be renderea visible by applying electrostatically charged developer particles, such as carbon particles, to the imaged surface where the particles adhere in the image pattern to the surface of the photoconductive layer by electrostatic attraction. A permanent visible image can be obtained, for example, by using developer particles which can be heat fused to the photoconductive layer and subjecting it to a heat application step. The developing steps are most con-veniently accomplished at a location away from the charge and image dule 13 by any conventional developing means.
The preferred form of the invention is an exposed-frame indicator which includes dark mask means 27 at the border regions of the copyboard 15 for producing a dark border region around the imaged frame of the microfiche. Figure 3 illustrates an imaged frame of the microfiche 12 of Figure 2, where 31 generally indicates the boundaries of this particular frame, '~
:
.,- ' : .
:. . - . . .. : ~ .
,. .. . .: .
3as4~4 32 illustrates the dark border formed by imaging the document through a copyboard 15 having dark mask means 27, and 33 illustrates data recorded from the document. The invention further includes light projection means 23 which directs a beam of light 24, onto dark border region 32 of the imaged frame and a signal-light detector 26 which detects the re-flected signal light from the surface of the photconductive layer. The signal-light detection means 26 can be provided - by a conventional photocell which can measure the intensity of light it receives.
Although many arrangements of the signal-light projection means 23 and signal-light detection means 26 can be employed, it is preferred that the projection means 23 is located adjacent the border of the copyboard 15 so that the signal light beam 24 is assured of being projected onto the predetermined position of the frame where the dark border 32 will be developed. Also, it is preferred that the signal-light detecting means 26 be mounted within the charge and image module 13 at a position off of the imaging axis 18 so that it does not interfere with imaging of the microflche. This arrangement can be satisfactorily accomplished because the surface of the photo-conductive layer specularly reflects light at an angle which directs the reflected beam of light out of the imaging axis 18.
In operation, the highly reflect:lve surface of an un-developed photoconductive layer reflects a relatively stronglight beam to the signal-light means 26. But, after development of a particular frame, whereupon dark toner particles are de-posited and fused to form a dark border region 32, the intensity of the re~lected signal light is significantly diminished, and the reduced signal is detected by the detector means 26. An . : ... . ~, - . : , f~3~4 electric signal dependent upon the magnitude o~ the signal light received ~y the signal-light detection means 26 can be produced by conventional means for purposes of informing the operator that the ~rame has already been exposed. The operator can be informed by a warning light and/or electrical control means to prevent inadvertant re-imaging of an already imaged frame.
Although the preferred embodiment of the invention is as described above, it will be obvious to one skilled in the a.t that many variations within the scope of the invention can be practiced. For example, the data recorded upon an imaged frame does not have to be in the form of a dark border, although this is preferable in that it also produces an attrac-tive arrangement on the imaged microfiche and it permits wide latitude in placing the signal-light projection and detection means 23 and 26. The data could also be in the form of a ~ single dark mark imaged at the predetermined position 25 on - the frame, or a number o~ marks or partLcular figures (including numerals and letter3) which would produce a varying intensity or magnitude reflected signal light, the intensity or magnitude of which depends upon the number of or type of figures. With this latter arrangement, it would be possible to detect such - information as frame number or othe~ identifying information.
Additionally, the positions of the signal-light projection means 23 and signal-light detection means 26 could be altered, although these particular posit:Lons are highly - advantageous for the microphotographic recording apparatus ; illustrated in Figure 1. The projection means 23 and detection mean~ 26 could be in reverse position. The detection means 26 could also be outside of the module 13, or even on the opposite . - - , . . . : ~ ., . . . .
' : ' . ' '~ '' . .' , ., . '.; ', ' . ~ . ' - ' 3~
side of the film 12, in which case the signal-light detection means would determlne the intensity of the light beam 24 passing through the film 12. However, in an apparatus of the type illustrated in Figure 1, where the micro~iche 12 iq commonly positioned in a carrier ~not shown), it is not con-venient to pass the light through the film because of inter-ference by the carrier. A further arrangement which could be utilized i~ the use of multiple signal-light pro~ection means, each projecting a beam to a different predetermined position 25 on the frame, which either one or a plurality ~f signal-light detection means receiving the reflected light.
It i9 al o possible to advantageously employ the invention where the photographic recording medium reflects light diffusely, rather than specularly or the signal-light - 15 projection means 23 could be an ordinary lamp casting light in all directions rather than in a beam. However, it is far more convenient in avoiding "noise" interference from outside source~ of light if the signal light i3 projected in a beam and the light iq specularly reflected. A specularly reflected beam of light will form a cone shape beam with equal light intensity at all positions in the cone for equal distances from the reflecting surface. Therefore, the placement of the signal-light detection means 26 is not limited to a single line, but aan be plac-d ~ver a larg-r areq.
. !
.~443Q4 ~he present invention relates generally to systems for photographically storing data, and more particularly, to an apparatus for detecting data recorded at a predetermined position on a electrophotographic film. ~ -Stimulated by the costs incurred in storing the ever-increasing ~olume of documentary material which is presently being generated, considerable effort has been expended in the design and development of various electrophotographic and other data storage and retrieval systems. Particular emphasis has been placed on the design of microphotographic systems which may be used to decrease the physical bulk of such stored materials without sacrificing file retrieval and/or copy re-production capabilities. `
A particularly desirable microphotographic copying l`
system has been developed which records data from documents --upon discrete frames of a multi-frame microfiche. This type of microfiche is a transparent electrophotographic film having a substrate of transparen~ material, such as five mil polyester base, with a thin transparent conductive layer coated thereon ;~
as well as an additional outer layer of a suitable transparent photoconductive material. Any number of various films in the ;~ art may be utilized with equal efficiency in this type of apparatus, such as those disclosed in U.S. Patents Nos.
3,290,147; 3~314,788; and 3,615,404.
~ .
- ~.
3~ ~
An operator places a microfiche within the photo-copying machine and sequentially records images of documents on individual frames in the microfiche. The number of frames in a microfiche might be sixty or more, and it is common for the operator to record document information on several of the frames and then remove the microfiche for storage until later information is desired to be recorded on other frames of the microfiche. When the partially imaged microfiche is returned to the copying machine for further recording of docu-ment information, the operator must selectively position thefirst unimaged frame which sequentially follows the last imaged frame onto the imaging optical axis. While this can be done by the operator not~ng the position of the last imaged frame and pressing an indexing control button to move the next frame onto position, this method is time consuming and subject to error. If the operator erroneously selects a previously imaged frame and proceeds to project a new image upon that frame, he could superimpose additional data upon the frame, perhaps re-sulting in obl~teration of the previous image.
Therefore, it is an object of the invention to pro-vide an apparatus for detecting information, in general, re-corded on a film and particularly information which indicates whether a selected frame has already been imaged.
The apparatus of the invention employs the light transmitting and reflecting propertie~ of 1he photoconductive layer of a microfiche. Specifically, the surface of the photo-conductive layers used in transparent electrophotographic re-cording mediums specularly reflect a beam of light from the surface when undeveloped with toner particles. However, when the photoconductive surface has been electrostatically charged ,: , ~ . . .
.: - . - . ,. ~ .
..
,~ - . . .. : - :
,~., - ' ' ~ 3~
and exposed to a light pattern and developed with toner parti-cles, such as carbon particles, the dark toned areas signifi-cantly reduce the light transmission and reflecting properties of the photoconductive layer. Thus, the magnitude or intensity of the light reflected from or passed through the toned area on the photoconductive layer will be significantly reduced.
The invention provides in an apparatus for selective-ly imaging discrete frames on a photographic recording medium having a plurality of frames thereon and upon which imaging is accomplished by projecting an illuminated image from a document through a lens and onto the selected frame on the photographic recording medium, an exposed frame detector comprising signal-light projection means for projecting light to a predetermined position o~ each frame of the photographic recoFding medium;
signal-light detection means positioned to receive the signal light leaving the photographic recording medium and for detect-ing the magnitude of the signal light leaving the photographic recording medium; and means within the apparatus for causing the predetermined position of each frame to change its optical prop-erties upon developing an image on the frame, whereby the magni-tude of the signal light received by the signal-light detection means is reduced. -Figure 1 is a diagrammatic sectional view showing an electrophotographic recording apparatus within which the inven- -; 25 tion is employed.
Figure 2 is a plan view of a microfiche useful with the invention, illustrating several exposed frames.
Figure 3 is an enlarged partial view of an imaged frame of the microfiche illustrated in Figure 2.
The electrophotographic recording apparatus in which the present invention is preferably used is diagramma--; tically illustrated in Figure 1. The apparatus includes an enclosure 10 having top panel with a transparent copyboard 15 upon which the document 16 to be copied is placed. Within the : -4-.
- ~$ ~ t'~
enclosure 10, is a projection lamp 17, which reflects a light off of document 16 onto mirror 14 where the image is - projected along imaging optical axis 18, through a lens 19 mounted in a charge and image module 13, and onto the se-lected frame of a microfiche 12. Within the charge and image module 13 is a corona charging needle 20, which is charged by a conventional high voltage potential ~not shown) to produce a corona and electrostatically charge the photoconductive layer of the frame positioned against the module 13. The charge and image module 13 includes ma~k 21, forming an opening 22 against 4 which the selected frame on the microfiche 12 is positioned.
After charging, the light image from the document is projected onto the photoconductive layer of the frame being imaged to pattern dissipate the charge and produce a latent electrostatic image. The imaged frame can be renderea visible by applying electrostatically charged developer particles, such as carbon particles, to the imaged surface where the particles adhere in the image pattern to the surface of the photoconductive layer by electrostatic attraction. A permanent visible image can be obtained, for example, by using developer particles which can be heat fused to the photoconductive layer and subjecting it to a heat application step. The developing steps are most con-veniently accomplished at a location away from the charge and image dule 13 by any conventional developing means.
The preferred form of the invention is an exposed-frame indicator which includes dark mask means 27 at the border regions of the copyboard 15 for producing a dark border region around the imaged frame of the microfiche. Figure 3 illustrates an imaged frame of the microfiche 12 of Figure 2, where 31 generally indicates the boundaries of this particular frame, '~
:
.,- ' : .
:. . - . . .. : ~ .
,. .. . .: .
3as4~4 32 illustrates the dark border formed by imaging the document through a copyboard 15 having dark mask means 27, and 33 illustrates data recorded from the document. The invention further includes light projection means 23 which directs a beam of light 24, onto dark border region 32 of the imaged frame and a signal-light detector 26 which detects the re-flected signal light from the surface of the photconductive layer. The signal-light detection means 26 can be provided - by a conventional photocell which can measure the intensity of light it receives.
Although many arrangements of the signal-light projection means 23 and signal-light detection means 26 can be employed, it is preferred that the projection means 23 is located adjacent the border of the copyboard 15 so that the signal light beam 24 is assured of being projected onto the predetermined position of the frame where the dark border 32 will be developed. Also, it is preferred that the signal-light detecting means 26 be mounted within the charge and image module 13 at a position off of the imaging axis 18 so that it does not interfere with imaging of the microflche. This arrangement can be satisfactorily accomplished because the surface of the photo-conductive layer specularly reflects light at an angle which directs the reflected beam of light out of the imaging axis 18.
In operation, the highly reflect:lve surface of an un-developed photoconductive layer reflects a relatively stronglight beam to the signal-light means 26. But, after development of a particular frame, whereupon dark toner particles are de-posited and fused to form a dark border region 32, the intensity of the re~lected signal light is significantly diminished, and the reduced signal is detected by the detector means 26. An . : ... . ~, - . : , f~3~4 electric signal dependent upon the magnitude o~ the signal light received ~y the signal-light detection means 26 can be produced by conventional means for purposes of informing the operator that the ~rame has already been exposed. The operator can be informed by a warning light and/or electrical control means to prevent inadvertant re-imaging of an already imaged frame.
Although the preferred embodiment of the invention is as described above, it will be obvious to one skilled in the a.t that many variations within the scope of the invention can be practiced. For example, the data recorded upon an imaged frame does not have to be in the form of a dark border, although this is preferable in that it also produces an attrac-tive arrangement on the imaged microfiche and it permits wide latitude in placing the signal-light projection and detection means 23 and 26. The data could also be in the form of a ~ single dark mark imaged at the predetermined position 25 on - the frame, or a number o~ marks or partLcular figures (including numerals and letter3) which would produce a varying intensity or magnitude reflected signal light, the intensity or magnitude of which depends upon the number of or type of figures. With this latter arrangement, it would be possible to detect such - information as frame number or othe~ identifying information.
Additionally, the positions of the signal-light projection means 23 and signal-light detection means 26 could be altered, although these particular posit:Lons are highly - advantageous for the microphotographic recording apparatus ; illustrated in Figure 1. The projection means 23 and detection mean~ 26 could be in reverse position. The detection means 26 could also be outside of the module 13, or even on the opposite . - - , . . . : ~ ., . . . .
' : ' . ' '~ '' . .' , ., . '.; ', ' . ~ . ' - ' 3~
side of the film 12, in which case the signal-light detection means would determlne the intensity of the light beam 24 passing through the film 12. However, in an apparatus of the type illustrated in Figure 1, where the micro~iche 12 iq commonly positioned in a carrier ~not shown), it is not con-venient to pass the light through the film because of inter-ference by the carrier. A further arrangement which could be utilized i~ the use of multiple signal-light pro~ection means, each projecting a beam to a different predetermined position 25 on the frame, which either one or a plurality ~f signal-light detection means receiving the reflected light.
It i9 al o possible to advantageously employ the invention where the photographic recording medium reflects light diffusely, rather than specularly or the signal-light - 15 projection means 23 could be an ordinary lamp casting light in all directions rather than in a beam. However, it is far more convenient in avoiding "noise" interference from outside source~ of light if the signal light i3 projected in a beam and the light iq specularly reflected. A specularly reflected beam of light will form a cone shape beam with equal light intensity at all positions in the cone for equal distances from the reflecting surface. Therefore, the placement of the signal-light detection means 26 is not limited to a single line, but aan be plac-d ~ver a larg-r areq.
. !
Claims (5)
1. In an apparatus for selectively imaging discrete frames on a photographic recording medium having a plurality of frames thereon and upon which imaging is accomplished by projecting an illuminated image from a document through a lens and onto the selected frame on the photographic recording medium, an exposed frame detector comprising signal-light projection means for projecting light to a predetermined position on each frame of the photographic recording medium;
signal-light detection means positioned to receive the signal light leaving the photographic recording medium and for detecting the magnitude of the signal light leaving the photographic recording medium; and means within the apparatus for causing the predetermined position of each frame to change its optical properties upon developing an image on the frame, whereby the magnitude of the signal light received by the signal-light detection means is reduced.
signal-light detection means positioned to receive the signal light leaving the photographic recording medium and for detecting the magnitude of the signal light leaving the photographic recording medium; and means within the apparatus for causing the predetermined position of each frame to change its optical properties upon developing an image on the frame, whereby the magnitude of the signal light received by the signal-light detection means is reduced.
2. The exposed-frame detector according to claim 1, wherein the means for causing the predetermined position on each frame to change its optical properties upon developing an image on the frame is provided by dark mask means around the border of a copyboard upon which the document is placed, the dark mask means producing a dark border on each frame.
3. The exposed-frame detector according to claim 1, wherein the signal light is projected in a beam and is specularly reflected from the surface of the photographic medium in a reflected conical shaped beam, and the signal-light detection means is positioned in the path of the reflected beam.
4. The apparatus according to claim 3, wherein the photo-graphic recording medium is a transparent electrophotographic microfiche, and the apparatus further comprises document holding means for holding the document to be imaged on the microfiche;
means for projecting the image of the document along an optical axis to the selected frame on the microfiche; a charge-and-image module positioned on the optical axis and including a lens and electrostatic charging element; and wherein the signal-light projection means is mounted adjacent the border of the document holding means for projecting the signal-light through the lens of the charge-and-image module, and the signal-light detecting means is positioned within the charge-and-image module.
means for projecting the image of the document along an optical axis to the selected frame on the microfiche; a charge-and-image module positioned on the optical axis and including a lens and electrostatic charging element; and wherein the signal-light projection means is mounted adjacent the border of the document holding means for projecting the signal-light through the lens of the charge-and-image module, and the signal-light detecting means is positioned within the charge-and-image module.
5. The apparatus according to claim 4, wherein the signal-light detecting means is positioned off of the optical axis, whereby it does not interfere with imaging of the microfiche.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US459197A US3873213A (en) | 1974-04-08 | 1974-04-08 | Method and apparatus for detecting data on a photographic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044304A true CA1044304A (en) | 1978-12-12 |
Family
ID=23823798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA223,993A Expired CA1044304A (en) | 1974-04-08 | 1975-04-07 | Method and apparatus for detecting data on a photographic recording medium |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3873213A (en) |
| JP (1) | JPS5817954B2 (en) |
| BE (1) | BE827656A (en) |
| CA (1) | CA1044304A (en) |
| DE (1) | DE2515327A1 (en) |
| FR (1) | FR2266907B1 (en) |
| GB (1) | GB1510532A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4348104A (en) * | 1981-01-23 | 1982-09-07 | Energy Conversion Devices, Inc. | Double exposure control for microfiche recording system |
| JPS59146750A (en) * | 1983-02-14 | 1984-08-22 | Daito Kogyo Kk | Grinding of groove part to be welded |
| JPS6064341A (en) * | 1983-09-19 | 1985-04-12 | Fuji Photo Film Co Ltd | Retrieval system of microfilm |
| JPS62133475A (en) * | 1985-12-04 | 1987-06-16 | Fuji Photo Film Co Ltd | Method for fixing unfixed frame |
| US4955032A (en) * | 1988-04-22 | 1990-09-04 | A. B. Dick Company | Method and apparatus for mapping frames of an updatable electrophotographic medium |
| US4987439A (en) * | 1989-09-11 | 1991-01-22 | Eastman Kodak Company | Sensing magnetic recording on film of series scence indication an use thereof in a photofinishing system |
| DE9413675U1 (en) * | 1994-08-25 | 1994-10-27 | Dst Deutsche System-Technik Gmbh, 28307 Bremen | Scanning device for punched cards |
| FR2798479B1 (en) * | 1999-09-14 | 2001-11-09 | Thierry Pinte | DEVICE FOR THE PRODUCTION OF A BLACK OR COLORED EDGE WHEN PRINTING A PHOTOGRAPH |
| GB2401678B (en) * | 2003-01-14 | 2005-08-17 | Qti Presstech Ltd | Improvements to scanning heads |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2760404A (en) * | 1953-12-31 | 1956-08-28 | Internat Telemeter Corp | Photographic memory |
| US3240114A (en) * | 1961-11-17 | 1966-03-15 | Jonker Business Machines Inc | Information storage and retrieval copy apparatus |
| US3251761A (en) * | 1962-08-28 | 1966-05-17 | Bayer Ag | Process for the production of organic compounds containing nitrogen and chlorine combined in an-n=ccl-radical |
| US3299272A (en) * | 1963-02-09 | 1967-01-17 | Ricoh Kk | Photosensitive system for taking out desired portions of records on microfilm |
| US3418905A (en) * | 1965-12-30 | 1968-12-31 | Polaroid Corp | Photoresponsive film supply monitoring apparatus for a photographic camera |
| US3469105A (en) * | 1967-09-05 | 1969-09-23 | Itek Corp | Photoelectric apparatus for detecting the borders of information bearing regions of records |
| US3623024A (en) * | 1968-02-09 | 1971-11-23 | Us Army | Signal recovery system using optical mixing |
| US3523495A (en) * | 1968-03-15 | 1970-08-11 | Ibm | Apparatus for forming circuit masks on photosensitized screens and inspecting the same and/or inspecting substrates having conductive circuit patterns |
| US3549254A (en) * | 1968-10-23 | 1970-12-22 | Stromberg Datagraphix Inc | Optical system |
| US3597045A (en) * | 1969-06-30 | 1971-08-03 | Ibm | Automatic wafer identification system and method |
| US3594087A (en) * | 1969-11-06 | 1971-07-20 | Baxter Laboratories Inc | Optical densitometer with retroreflective means |
| US3685912A (en) * | 1970-04-01 | 1972-08-22 | Ingenuics Inc | Large area retro-transmitting light meter |
| DE2128241A1 (en) * | 1971-06-07 | 1973-01-04 | Audac Corp | RECORDING SYSTEM |
-
1974
- 1974-04-08 US US459197A patent/US3873213A/en not_active Expired - Lifetime
-
1975
- 1975-04-07 GB GB14210/75A patent/GB1510532A/en not_active Expired
- 1975-04-07 CA CA223,993A patent/CA1044304A/en not_active Expired
- 1975-04-07 BE BE1006578A patent/BE827656A/en not_active IP Right Cessation
- 1975-04-08 JP JP50041908A patent/JPS5817954B2/en not_active Expired
- 1975-04-08 FR FR7510976A patent/FR2266907B1/fr not_active Expired
- 1975-04-08 DE DE19752515327 patent/DE2515327A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2515327C2 (en) | 1989-05-18 |
| US3873213A (en) | 1975-03-25 |
| GB1510532A (en) | 1978-05-10 |
| BE827656A (en) | 1975-10-07 |
| JPS5817954B2 (en) | 1983-04-11 |
| JPS50146341A (en) | 1975-11-25 |
| DE2515327A1 (en) | 1975-10-09 |
| FR2266907A1 (en) | 1975-10-31 |
| FR2266907B1 (en) | 1979-08-03 |
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