CA2072427A1 - Magnifying display device - Google Patents
Magnifying display deviceInfo
- Publication number
- CA2072427A1 CA2072427A1 CA 2072427 CA2072427A CA2072427A1 CA 2072427 A1 CA2072427 A1 CA 2072427A1 CA 2072427 CA2072427 CA 2072427 CA 2072427 A CA2072427 A CA 2072427A CA 2072427 A1 CA2072427 A1 CA 2072427A1
- Authority
- CA
- Canada
- Prior art keywords
- document
- rest
- reading means
- display device
- frame
- 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.)
- Abandoned
Links
Classifications
-
- 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
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
-
- 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
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
- H04N1/19594—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays using a television camera or a still video camera
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- 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
- H04N2201/043—Viewing the scanned area
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- 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
- H04N2201/0436—Scanning a picture-bearing surface lying face up on a support
-
- 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
- H04N2201/045—Mounting the scanning elements in a collapsible or foldable structure, e.g. for ease of transportation
Abstract
ABSTRACT
A magnifying display device which is constituted to be portable in part except for a monitor TV, which has reading means capable of always keeping a fixed distance up to the reading surface of a document regardless of a thickness of the document to be read, and further which makes the light illuminated and then reflected by the document surface less likely to enter eyes of a user. An upper frame on which reading means such as TV camera is mounted and which is substantially rectangular in a plan view and a document rest on which a document to be read is placed and which is substantially rectangular in a plan view are supported through leg members such that the frame and the rest are substantially parallel to each other with an appropriate vertical spacing kept therebetween, and the frame, the rest and the leg members are interconnected in such a manner as able to be folded into a laminated state. A color filter, which cuts off most of visible light, but allows only infrared rays and light in a red or orange range to pass therethrough, is detachably attached to the front side of the illumination light source.
A magnifying display device which is constituted to be portable in part except for a monitor TV, which has reading means capable of always keeping a fixed distance up to the reading surface of a document regardless of a thickness of the document to be read, and further which makes the light illuminated and then reflected by the document surface less likely to enter eyes of a user. An upper frame on which reading means such as TV camera is mounted and which is substantially rectangular in a plan view and a document rest on which a document to be read is placed and which is substantially rectangular in a plan view are supported through leg members such that the frame and the rest are substantially parallel to each other with an appropriate vertical spacing kept therebetween, and the frame, the rest and the leg members are interconnected in such a manner as able to be folded into a laminated state. A color filter, which cuts off most of visible light, but allows only infrared rays and light in a red or orange range to pass therethrough, is detachably attached to the front side of the illumination light source.
Description
MAGNIFYING DISPLAY DEVICE
BACKGROUND OF THE INVENT~ON
Field of the Invention The present invention relates to a magnifying display device which displays characters, photographs, pictures and so forth contained in books, newspapers and the like on a CRT such as a monitor TV in a magnified scale, and thus wh}ch is useful particularly for those persons who are weak in eyesight, e.g., amblyopic people.
Description of the Related Art Heretofore, there have been known magnifying displaY
devices under the trade name represented by "Magnifying Reading Units for the Weak-Sighted" which help weak-sighted persons (amblyopic people) in reading. One prior example of such devices is arranged such that, as shown in Fig. 12, reading means B having a similar function to a TV camera and illumination means C are mounted to direct downwardly in the upper portion of a stand A in the form of box-l ike frame with the height of about 30 cm, and a document D such as a book to be read is put in the lower portion of the stand A. The reading means B partially senses characters and so forth contained in the document D by printing or the like, and the sensed Images are displayed on the screen of a monitor TY E in a magnified scale.
The monitor TV E providing the magnified display plane is divided into the type that is rested on the stand A and the type that is placed separately. In either type of the magnifying display device, however, the entire device is designed and manufactured as the desk top type, which leads to a problem that it cannot be easily transported.
Also, in the prior magnifying display of the desk top type, because of the reading means B being fixed in posi-tion, when the distance from the reading surface of the document D to the reading means B is slightly variable as experienced when the document D to be read is relatively thin like newspapers and normal books, focusing can be made by manual~y operating a lens of a TV camera as a main component of the reading means B. But, in the case of thick books such as handbooks and dictionaries, the dis-tance between the reading means and the document is too small to properly operate the lens and, therefore, the focus~ng may not be achieved depending on the thickness of the document D. Thus, a problem has been encountered that the contents of so thick document cannot be clearly dis-played in a magnified scale.
Further, in the prior magnifying display device, when the document D is partially imaged by the reading means B
like a TV camera, a paper surface P of the document D is 2072~2~
illuminated by the illumination means C, as shown in Fig.
11. But, since the paper surface P is usually white in a large part, Illumination of the paper surface P causes the reflected light C1 to enter eyes E of a user M and some users may not endure the reflected light when they are weak in eyesight. More specifically, some of the weak-sighted are those persons who cannot see bright light, for example, who suffer from the retina pigmentary degeneration. In view of those persons, the above problem has been dealt with by processing the image displayed on the monitor TV E
such that the monochromatic image on the moni tor TV is reversed in color to reduce the amount of light emitted from a CRT. This has accompanied a problem that it is inevitable for even a user who suffers from the retina pigmentary degeneration to see the paper surface P or the screen of the monitor TV E at the time of reversing the image in color and thus feel an intolerable pain.
SUMMARY OF THE INVENTION
With the above-mentioned state of art in mind, an object of the present ~nvention is to provide a magnifying display device which is constituted to be portable in part except for a ~onitor TV, which has reading means capable of always keeping a fixed distance up to the reading surface of a document regardless of a thickness of the document to 2~72427 be read, and further which makes the light illuminated and then reflected by the document surface less likely to enter eyes of a user.
According to an aspect of the first invention made w~th a view of solving the above object, an upper frame on which reading means such as TV camera is mounted and which is substantially rectangular in a plan view and a document rest on which a document to be read is p]aced and which is substantia11y rectangular in a plan view are supported through leg members such that said frame and said rest are substantially parallel to each other with an appropriate vertical spacing kept said frame and said rest, and said frame, said rest and said leg members are interconnected in such a manner as able to be folded into a laminated state.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view of one example of a magnifying display device according to the present invention in use.
Fig. 2 is a side view of the divice of Fig. 1 in a folded state.
Fig. 3 is a side view showing a first stage of the folding process.
Fig. 4 is a side view showing a second stage of the folding process.
Fig. 5 is a front view, partially broken away, of the 2072~27 device of Fig. 1.
Fig. 6 is a front view of one example of the device shown in Fig. 1 equipped wlth one example of distance meas-uring means.
Flg. 7 is ~ right slde view of the device of Fig. 6.
Fig. 8 is a side view of another example of the device according to the present invention which is constituted to be portable.
Fig. 9 is a side view of the device of Fig. 8 in a folded state.
Fig. 10 is a front view showing the principles of a device of the present invention in which the reflected light is less likely to enter eyes of a user.
Fig. 11 is a front view for explainlng the reflected light in a prior device.
Fig. 12 is a front view of one example of prior de-vices.
The following is a description about an example of the first invention with reference to the drawings, as well as a description about the constitution of the second and subsequent inventions. Fig. 1 is a side view of one exam-ple of a magnifying display device according to the present invention in use which is constituted to be portable, Fig.
2 is a side view of the device of Fig. 1 in a folded state, Figs. 3 and 4 are side views showing the folding process in successive stages, Fig. 5 is a front view, partially broken away, of the device of Fig. 1, Fig. 6 is a front view of one example in which a monitor TV is placed on the devlce of Fig. 1 equipped with one example of range measuring means, Fig. 7 is a right side view of the device of Fig. 6, Fig. 8 is a side view of another example of the device according to the present invention which is constituted to be portable, Fig. 9 is a side view of the device of Fig. 8 in a folded state, Fig. 10 is a front view showing the principles of a device of the present invention in which the reflected light is less likely to enter eyes of a user, Fig. 11 is a front view for explaining the reflected light in a prior device, and Fig. 12 is a front view of one example of prior devices.
In Figs. 1 to 7, denoted by reference numeral 1 is an upper frame substantially rectangular in outer configura-tion as viewed from above, and principally comprises an upper panel la and a pair of left and right side walls lb.
In the foremost side (i.e., the left side in Fig. 1) of the upper frame 1, reading means 2 constructed into one unit is mounted to the lower surface in such a manner that it is suspended to be slidable in the vertical direction and fixedly supported at a slid position. lc is a rear wall 2072~27 disposed between the left and right side walls lb, and is provided with an input and output terminal group EP con-nected to the reading means 2 explained in detail later.
The reading means 2 is in the form of a camera unit CU
constituted by containing, in a housing 2e, a T~ camera 2c which comprises an optical system 2a consisted of a lens, with or without a zooming function, and so forth, and an optical path changing mirror 2d for changing an optical path of the optical system 2a. The camera unit CU is attached in such a manner that set screws 2f provided on the lateral sides of the housing 2e and having operating knobs 2g are engaged in oblong holes le, lf which are formed, as supporting members, through the left and right side walls lb and a front wall ld in the forward side of the upper frame 1. Specifically, the camera unit CU is fixed in place bY turning the knobs 2g to loosen the screws 2f, sliding the camera unit CU to select its vertical position, and then fastening the screws 2f at the selected position.
In the camera unit CU, as shown in Fig. 5, a light source 9 such as a glow lamp for illuminating the surface of a document rest, over which a document is to be placed, is provided facing the lower surface of the housing 2e and a color filter member 10, which allows only infrared rays and light in a red region to pass therethrough, but cuts 2072~27 off all or most of visible light, is detachably attached to the front side of the light source 9. 11 is a filter holder for holding the filter member 10 in a detachable manner.
Denoted by 3 is a lower frame of which outer conflgu-ratlon in a plan view is formed substantially commensurate with the upper frame 1. On the upper surface of the lower frame 3, a document table 4 serving as a rest, over which a document like a book to be read is placed, is disposed on the upper surface of a slide base 4B in such a manner that the document table can freely slide forwardly and backward-ly (i.e., in the lateral direction in Fig. 1), as well as to the left and right (i.e., in the lateral direction in Fig. 5)~ the slide base 4B being mounted to be slidable forwardly and rearwardly with respect to the lower frame 3.
More specifically, guide pins 3b, 3c each having an operat-ing knob 3a are projected on each of the left and right side walls of the lower frame 3, the slide b&se 4B has a pair of left and right slide guides 4a each formed with oblong guide holes 4b, and further the pins 3b, 3c are loosely fitted in and supported by those oblong gulde holes 4b in the left and right guides 4a. The document table 4 is then disposed on the slide base 4B to be slidable for-wardly and rearwardly as well as to the left and right, whereby the document table 4 is mounted with respect to the lower frame 3 in such a manner that it can freely slide forwardly and backwardly (i.e., in the lateral direction in Fig. 1), as well as to the left and right (i.e., in the lateral direction in Fig. 5).
Note that the document table 4 used in the present invention is not necessarily slidable forwardly and rear-wardly as well as to the left and right. The document table 4 may be slidable in any one direction, or not slida-ble In any directions. In the latter case, the lower frame 3 is formed to double as the document table 4.
Denoted by 5 is a leg member disposed on the left and right sides at the rear ends of the upper and lower frames l, 3 (i.e., on the right side in Figs. l and 2) to support both the frames with a predetermined vertical width there-between. The left and right leg members 5 have hinges 5a, Sb provided at their upper and lower ends for supporting the upper and lower frames 1, 3 in a foldable and reassem-bled manner, thereby constituting the stand of the magnlfy-ing display device. The construction to make the stand foldable and reassembled will now be described.
In the illustrated embodiment, the upper hinges Sa comprise support screws 6 with knobs 6a which are screwed to the outer side surfaces of the left and right leg mem-bers 5, 5 for fastening and locking those leg members through locked notches 7 formed in the 10wer sides of the 2072~27 ~o --left and right side walls lb of the upper frame 1 at their rear end portions, so that the upper frame 1 is held almost perpendicular to the left and right erected leg members 5, 5 and supported in a horizontal posture. 7' is a notch whlch is formed forwardly of the notch 7 in the side wall lb and used to support the upper frame 1 therethrough under a folded state. As an alternative, the hinge 5a may be arranged to make the stand foldable and reassembled by pivotally coupling the upper end portion of the leg member 5 to the lower right end portlon of the upper frame 1 by a shaft, connecting the intermediate portion of the leg member 5 and the lower side of the upper frame 1 at its intermediate portion by a foldable arm member (not shown), and bringing the foldable arm member into a folded or extended state.
On the other hand, the lower hinges Sb each comprise a small rectangular hinge plate 8 of which upper portion in the forward side is fixed to the lower end portion of the leg member 5 as indicated by 8a, while the lower frame 3 is pivotally supported at its rear end to the lower portion of the hinge plate 8 in the rearward side as indicaied by 8b.
Therefore, the lower frame 3 can be rotated 270 degrees counterclockwise from an assembled state of Fig. 1 so that it is folded into a posture substantially parailel to the leg member 5 in side by side relation. Additionally, 8c in 2072~27 Fig. 1 is a circular hole which is formed in the hinge plate 8 to provide a clic~ in operation at the time when assembling and folding of the lower frame 3 are completed.
A steel ball 3d normally biased by a spring (not shown) from the back slde of the drawlng sheet is disposed in the lower frame 3 at a position corresponding to hole 8c such that the steel ball 3d is slightly projected from the surface. The device of the present invention is thus constituted.
One example of the device of the present invention constituted as explained abo~e operates as follows. In the assembled state shown in Fig. 1, by loosening the attach-ment screws 2f and lowering them in the oblong holes le, lf, the camera unit CU constituting the reading means 2 is slid downwardly and properly positioned relative to the upper frame 1. On the other hand, a document (not shown) to be displayed in a magnified scale for reading is placed on the upper surface of the document table 4. While slid-ing the document table 4 in the X and Y directions on the slide base 4B which is withdrawn to the forward side of the lower frame 3, a position of the document surface to be read i5 aligned with an optical axis 2L of the camera 2c.
At the same time, the light source 9 is directed to the document surface for illuminating the same.
Characters and so forth on the document read by the TV
camera 2c are displayed in a magnified scale on the display plane DP of a monitor TV in the form of a CRT or the like, so that the weak-sighted can read the displayed contents of the document while being magnified using the device of the present invention. At this time, although the light emlt-ted from the light source 9 and reflected by the document surface enters eyes of the user, the reflected light will not detrimentally affect the user because the filter 10, which allows only infrared rays and the like to pass there-through, but cuts off visible light, is attached to the front side of the light source 9. Additionally, the filter lO for cutting off visible light is also suitable when applied to the prior display device in which the stand A is not of the fo]dable structure as shown in Fig. 12. This application will now be described with reference to Figs.
lO and 11.
With the prior magnifying display device as shown in Fig. 11, the normal weak-sighted can clearly see the docu-ment in a magnified scale. However, when viewers are particular types of amblyopic penple, e.g., those patients suffering from the retina pigmentary degeneration who cannot see bright light, there arises a problem that when the illumination light source C illuminates the paper surface P of the document D such as a book, the reflected llght from the paper surface P directly enters the eyes E, 20~2427 disabling those people to see the screen of the monitor TV
E. Another problem is in that even when the monochromatic image is reversed in color, they must direct their eyes E
toward the paper surface P being illuminated by the illumi-nation light source C upon pages of the document being turned over, forcing them to feel a pain due to the presence of the reflected light C1.
In the present invention, therefore, a visible-light cutting and infrared-ray transmitting filter 10, which cuts off vislble light, but allows infrared rays to pass there-through, can inserted between the document D and the paper surface P in a detachable manner to be disposed near the illumination light source 9, as shown in Fig. 10. Thus, in the case of the weak-sighted using the device, the filter 10 is located between the light source 9 and the paper surface P, whereby the paper surface P is Illumlnated wlth only infrared rays to prevent the reflected l;ght in a vlsible range from reachlng the eyes E.
As another example of the device of the present inven-tion shown in Flg. 10, besides the detachably inserted structure of the filter 10, a TV camera having sensitivity in a infrared range is employed instead of the above-stated usual TY camera 2c. This enables that characters and so forth are clearly imaged even with no illumination by visible light and the screen of the monitor TV DP is viewed 2~72427 without feelIng the light dazzled.
In Flg. 10, denoted by lOa is a holder for the fllter 10, the holder belng formed at the front end of a lamp housing 9a. The Infrared filter 10 can be posit~oned at and out of the front surface of the llght source 4 by a slidably holding mechanism of the holder lOa. Incidental-ly, lOb is a through hole where not filter is present. As an alternatlve, the filter 10 may be inserted into and removed from between the light source 9 and the paper surface P by any other desired mechanism such as the swing type. Further, the color filter 10 may be of a filter which allows light in a red or orange range to pass there-through. In other word, it is only re~uired for the color filter to cut off the reflected light in a visible range.
Then, one example of the device of the present Inven-tion explained above with reference to Figs. 1 to 7 is achieved by modifying the prior magnifying display device of the desk top type such that the stand comprising, as main parts, the reading means 2 and the document table 4 serving as a rest of the document to be read is of the freely folded and reassembled structure to be carrying it easily. The device having this portable type stand is carried to other place where an existing monitor TV or the like can be utilized as the disp~ay plane.
Considering thls aspect of the present invention, it 2~2427 will be apparent that the foldable structure of the stand according to one example of the device of the present invention ls not limited to the structure explained above with reference to Figs. 1 to 7. As another example, though not shown, the upper frame 1, the lower frame 3 and the document table 4 may be constructed in such a manner as able to join with and separate from each other and, in no use, those components are separated and put together into the laminated form. Alternatively, the foldable structure shown in Figs. B and 9 may be adopted. Moreover, though not shown, the freely folded and reassembled structure may be achieved by a combination of the pivotal structure of the components in the foregoing embodiment and the freely joined and separated structure. The foldable structure shown in Figs. 8 and 9 will be next described.
In another example of the device of the present inven-tion ~hown in Figs. 8 and 9, the lower frame 3 is consti-tuted by a front member 31 and a rear member 32 which are interconnected via a hinge 33 at a position near the rear end of the lower frame 3 and can be folded to posltion one above the other. On the other hand, in order that a hinge 5a~ provided at the upper end of a leg member 5' can be changed in its vertical attachment position in three stages, for example, the upper frame 1 housing the camera unit CU therein is provided in the left and right sides 2~72~
with a plurality of attachment holes 101 to 10~ for the hinge 5a', the holes being separated into three lines in the illustrated example which are arranged in the to-and-fro or horizontal direction and each include three holes In the vertical direction. Alternatively, each llne may include balls in two or four or more stages.
The hinge 5a' provided at the upper end of the leg member 5' has, on a plate-like hinge body 51a at positions corresponding to the attachment holes 101 to 103, pins (not appearing in the drawings) which are projected on the inner surface thereof and fitted into the attachment holes 101, 103, and a screw 52a with a knob which is screwed into the threaded hole 102 from the outer side. Also, two parallel inverted-L-shaped bar members 51, 52 jointly constituting the leg member 5' are pivotally supported at their front end pins 53a, 54a to the outer surface of the hinge body 51a. Additionally, there are provided stopper pins 55a, 56a for limiting rotation of the bar members 51, 52 at a predetermined angle.
Meanwhile, the lower ends of the bar members 51, 52 are pivotally supported by one pivot retainer 51b to the upper surface of the rear member 32 of the lower frame 3, thereby constituting a lower hinge 5a'. It will be noted that, in Figs. 8 and 9, the same reference numeral as those in Figs. 1 to 7 denote the same members.
The upper and lower frames 1, 3 interconnected by the foldable leg member 5' of the structure as explained above are assembled Into a state shown In Flg. 8. In thls assem-bled state, after removing the document table 4 out of the lower frame 3 or keeping it placed over the front member 31, the front member 31 is first turned countercloc~wise in Fig. 8 about the hinge 33 to be folded over the back or lower side of the rear member 32. Next, the upper frame I
is turned clockwise in Fig. 8 about the hinges 5a', 5b~
respectively provided at the upper and lower ends of the bar members 51, 52. As a result, the device can be folded into a state shown in Fig. 9.
Furthermore, the device of the present invention can also be arranged as described below Ior the purpose of adding more preferable functions from the viewpoint of practical use to the reading means 2 and the document table 4 of the magnifying display device in which the stand is constituted to be portable as has been previously ex-plained. This arrangement will be next described.
In one example of the device of the present invention shown in Figs. l to 7, the reading means 2 mainly compr~s-lng the camera unit CU is provided such that it can be changed in its vertical position with respect to the upper frame 1. More specifically, when a thick document P' to be read, such as a dictionary, is placed on the document table 4, the distance from the document surface to the focused point V in the camera unit CU, i.e., Ll ~ L2 = WD, is changed. Thus, the distance WD is reduced by ~Wd corre-sponding to the thickness of the document. This change of ~Wd, namely, the dlstance Ll reduced by the amount ~Wd, can be compensated for by loosening the knobs 2g of the attachment screws 2f, adjusting/correcting the vertical position of the reading means 2 upwardly through the sup-ports or oblong holes le, lf in the side and front walls, and then fixing the reading means 2 again.
In view of the same purpose, the device shown in Figs.
l to 7 can also achieve the same result by being so ar-ranged as to slide the TV camera 2c within the housing 2e in the to-and-fro direction and change the distance L2 from the focus point Y to the optical path changing mirror 2d, to thereby compensate for the above distance change ~Wd.
The sliding operation of the camera unit CU in the rearward direction corresponding to the distance ~Wd may be manual-ly performed, or automatically performed by utilizing a drive source such as a motor or small cylinder. The actu-ating mechanism may be of any desired driving type. Also, in the device of Figs. 8 and 9, the TY camera is properly positioned by selecting the vertical position of the hinge body 51a with respect to the upper frame 1 corresponding to the thic~ness of the document D.
2Q72~27 To automatically hold the distance WD from the docu-ment surface P to the focused point Y of the TV camera 2c constant at all times regardless of the thickness of the document and ensure a magnifying display function as ex-plained above with reference to F~g. 7, the devlce of the present Invention may be arranged to provlde distance measuring means, using any of mechanical, optical, magnet-lc, electrlc and ultrasonic means, at a position in the camera unit CU corresponding to the document surface P, and utilizes the difference ~Wd between the actual distance llp to the document surface P detected by the distance measur-ing means and the reference distance WD as a command varia-ble based on which the reading means 2 is moved upwardly or the T~ camera 2c is slid rearwardly.
Figs. 6 and 7 show an example of the device of the present invention adopting the simplest ~echanical distance measuring means. A distance bar 12 of the effective length WD is suspended from the housing 2e of the camera unit CU
in a foldable manner by commonly using the attachment screw 2f for the reading means 2, and the reading means 2 is vertically moved so that the lower end face of the bar 12 comes into contact with the document s~rface P or P'. Note that 12a is a shaft about which the bar 12 can be folded.
This permits the distance Ll between the document surface P
or P' and the mirror 2d to be kept constant regardless of 2072~27 the thickness of the document. In the case where the camera unit CU is vertically moved by utilizing the driving force of a motor or the like, a contact (not shown~ of an actuator swltch for the driving source may be provided on the lower end face of the bar 12 and the driving source such as a motor for moving the camera unit CU upwardly may be actuated until the contact is apart from the document surface P or P'.
As fully described above, while in prior magnifying display devices of the desk top type the stage comprising the reading means and the document rest could not be folded into a compact size for easy transportation, the device o~
the present invention is of the structure capable of being folded into a compact size, which is very convenient in that even at such locations as intrinsically equipped with no magnifying display devices, documents to be read can be displayed in a magnified scale if only the display plane given by a monitor TV or the like is present.
With the device of the present invention, since the reading span distance between the reading means and the document can be manually or automatically corrected to be held constant at all times regardless of the thickness of the document, any documents ranging from thin ones such as newspapers to thick ones such as dictionaries can be freely displayed in a magnified scale in spite of changes in the thickness of the documents while quickly responding to such changes.
Also, slncç the light source for Illumlnating the document surface is associated with the fllter member In a detachable manner which cuts off most of vlsible light, but allows only light that is necessary and sufficient for illuminating the document to sense its image, such as infrared rays, to pass therethrough, there will not occur a drawback that the light illuminated and reflected by the document may enter eyes of a user, making it hard to see the displayed image.
BACKGROUND OF THE INVENT~ON
Field of the Invention The present invention relates to a magnifying display device which displays characters, photographs, pictures and so forth contained in books, newspapers and the like on a CRT such as a monitor TV in a magnified scale, and thus wh}ch is useful particularly for those persons who are weak in eyesight, e.g., amblyopic people.
Description of the Related Art Heretofore, there have been known magnifying displaY
devices under the trade name represented by "Magnifying Reading Units for the Weak-Sighted" which help weak-sighted persons (amblyopic people) in reading. One prior example of such devices is arranged such that, as shown in Fig. 12, reading means B having a similar function to a TV camera and illumination means C are mounted to direct downwardly in the upper portion of a stand A in the form of box-l ike frame with the height of about 30 cm, and a document D such as a book to be read is put in the lower portion of the stand A. The reading means B partially senses characters and so forth contained in the document D by printing or the like, and the sensed Images are displayed on the screen of a monitor TY E in a magnified scale.
The monitor TV E providing the magnified display plane is divided into the type that is rested on the stand A and the type that is placed separately. In either type of the magnifying display device, however, the entire device is designed and manufactured as the desk top type, which leads to a problem that it cannot be easily transported.
Also, in the prior magnifying display of the desk top type, because of the reading means B being fixed in posi-tion, when the distance from the reading surface of the document D to the reading means B is slightly variable as experienced when the document D to be read is relatively thin like newspapers and normal books, focusing can be made by manual~y operating a lens of a TV camera as a main component of the reading means B. But, in the case of thick books such as handbooks and dictionaries, the dis-tance between the reading means and the document is too small to properly operate the lens and, therefore, the focus~ng may not be achieved depending on the thickness of the document D. Thus, a problem has been encountered that the contents of so thick document cannot be clearly dis-played in a magnified scale.
Further, in the prior magnifying display device, when the document D is partially imaged by the reading means B
like a TV camera, a paper surface P of the document D is 2072~2~
illuminated by the illumination means C, as shown in Fig.
11. But, since the paper surface P is usually white in a large part, Illumination of the paper surface P causes the reflected light C1 to enter eyes E of a user M and some users may not endure the reflected light when they are weak in eyesight. More specifically, some of the weak-sighted are those persons who cannot see bright light, for example, who suffer from the retina pigmentary degeneration. In view of those persons, the above problem has been dealt with by processing the image displayed on the monitor TV E
such that the monochromatic image on the moni tor TV is reversed in color to reduce the amount of light emitted from a CRT. This has accompanied a problem that it is inevitable for even a user who suffers from the retina pigmentary degeneration to see the paper surface P or the screen of the monitor TV E at the time of reversing the image in color and thus feel an intolerable pain.
SUMMARY OF THE INVENTION
With the above-mentioned state of art in mind, an object of the present ~nvention is to provide a magnifying display device which is constituted to be portable in part except for a ~onitor TV, which has reading means capable of always keeping a fixed distance up to the reading surface of a document regardless of a thickness of the document to 2~72427 be read, and further which makes the light illuminated and then reflected by the document surface less likely to enter eyes of a user.
According to an aspect of the first invention made w~th a view of solving the above object, an upper frame on which reading means such as TV camera is mounted and which is substantially rectangular in a plan view and a document rest on which a document to be read is p]aced and which is substantia11y rectangular in a plan view are supported through leg members such that said frame and said rest are substantially parallel to each other with an appropriate vertical spacing kept said frame and said rest, and said frame, said rest and said leg members are interconnected in such a manner as able to be folded into a laminated state.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view of one example of a magnifying display device according to the present invention in use.
Fig. 2 is a side view of the divice of Fig. 1 in a folded state.
Fig. 3 is a side view showing a first stage of the folding process.
Fig. 4 is a side view showing a second stage of the folding process.
Fig. 5 is a front view, partially broken away, of the 2072~27 device of Fig. 1.
Fig. 6 is a front view of one example of the device shown in Fig. 1 equipped wlth one example of distance meas-uring means.
Flg. 7 is ~ right slde view of the device of Fig. 6.
Fig. 8 is a side view of another example of the device according to the present invention which is constituted to be portable.
Fig. 9 is a side view of the device of Fig. 8 in a folded state.
Fig. 10 is a front view showing the principles of a device of the present invention in which the reflected light is less likely to enter eyes of a user.
Fig. 11 is a front view for explainlng the reflected light in a prior device.
Fig. 12 is a front view of one example of prior de-vices.
The following is a description about an example of the first invention with reference to the drawings, as well as a description about the constitution of the second and subsequent inventions. Fig. 1 is a side view of one exam-ple of a magnifying display device according to the present invention in use which is constituted to be portable, Fig.
2 is a side view of the device of Fig. 1 in a folded state, Figs. 3 and 4 are side views showing the folding process in successive stages, Fig. 5 is a front view, partially broken away, of the device of Fig. 1, Fig. 6 is a front view of one example in which a monitor TV is placed on the devlce of Fig. 1 equipped with one example of range measuring means, Fig. 7 is a right side view of the device of Fig. 6, Fig. 8 is a side view of another example of the device according to the present invention which is constituted to be portable, Fig. 9 is a side view of the device of Fig. 8 in a folded state, Fig. 10 is a front view showing the principles of a device of the present invention in which the reflected light is less likely to enter eyes of a user, Fig. 11 is a front view for explaining the reflected light in a prior device, and Fig. 12 is a front view of one example of prior devices.
In Figs. 1 to 7, denoted by reference numeral 1 is an upper frame substantially rectangular in outer configura-tion as viewed from above, and principally comprises an upper panel la and a pair of left and right side walls lb.
In the foremost side (i.e., the left side in Fig. 1) of the upper frame 1, reading means 2 constructed into one unit is mounted to the lower surface in such a manner that it is suspended to be slidable in the vertical direction and fixedly supported at a slid position. lc is a rear wall 2072~27 disposed between the left and right side walls lb, and is provided with an input and output terminal group EP con-nected to the reading means 2 explained in detail later.
The reading means 2 is in the form of a camera unit CU
constituted by containing, in a housing 2e, a T~ camera 2c which comprises an optical system 2a consisted of a lens, with or without a zooming function, and so forth, and an optical path changing mirror 2d for changing an optical path of the optical system 2a. The camera unit CU is attached in such a manner that set screws 2f provided on the lateral sides of the housing 2e and having operating knobs 2g are engaged in oblong holes le, lf which are formed, as supporting members, through the left and right side walls lb and a front wall ld in the forward side of the upper frame 1. Specifically, the camera unit CU is fixed in place bY turning the knobs 2g to loosen the screws 2f, sliding the camera unit CU to select its vertical position, and then fastening the screws 2f at the selected position.
In the camera unit CU, as shown in Fig. 5, a light source 9 such as a glow lamp for illuminating the surface of a document rest, over which a document is to be placed, is provided facing the lower surface of the housing 2e and a color filter member 10, which allows only infrared rays and light in a red region to pass therethrough, but cuts 2072~27 off all or most of visible light, is detachably attached to the front side of the light source 9. 11 is a filter holder for holding the filter member 10 in a detachable manner.
Denoted by 3 is a lower frame of which outer conflgu-ratlon in a plan view is formed substantially commensurate with the upper frame 1. On the upper surface of the lower frame 3, a document table 4 serving as a rest, over which a document like a book to be read is placed, is disposed on the upper surface of a slide base 4B in such a manner that the document table can freely slide forwardly and backward-ly (i.e., in the lateral direction in Fig. 1), as well as to the left and right (i.e., in the lateral direction in Fig. 5)~ the slide base 4B being mounted to be slidable forwardly and rearwardly with respect to the lower frame 3.
More specifically, guide pins 3b, 3c each having an operat-ing knob 3a are projected on each of the left and right side walls of the lower frame 3, the slide b&se 4B has a pair of left and right slide guides 4a each formed with oblong guide holes 4b, and further the pins 3b, 3c are loosely fitted in and supported by those oblong gulde holes 4b in the left and right guides 4a. The document table 4 is then disposed on the slide base 4B to be slidable for-wardly and rearwardly as well as to the left and right, whereby the document table 4 is mounted with respect to the lower frame 3 in such a manner that it can freely slide forwardly and backwardly (i.e., in the lateral direction in Fig. 1), as well as to the left and right (i.e., in the lateral direction in Fig. 5).
Note that the document table 4 used in the present invention is not necessarily slidable forwardly and rear-wardly as well as to the left and right. The document table 4 may be slidable in any one direction, or not slida-ble In any directions. In the latter case, the lower frame 3 is formed to double as the document table 4.
Denoted by 5 is a leg member disposed on the left and right sides at the rear ends of the upper and lower frames l, 3 (i.e., on the right side in Figs. l and 2) to support both the frames with a predetermined vertical width there-between. The left and right leg members 5 have hinges 5a, Sb provided at their upper and lower ends for supporting the upper and lower frames 1, 3 in a foldable and reassem-bled manner, thereby constituting the stand of the magnlfy-ing display device. The construction to make the stand foldable and reassembled will now be described.
In the illustrated embodiment, the upper hinges Sa comprise support screws 6 with knobs 6a which are screwed to the outer side surfaces of the left and right leg mem-bers 5, 5 for fastening and locking those leg members through locked notches 7 formed in the 10wer sides of the 2072~27 ~o --left and right side walls lb of the upper frame 1 at their rear end portions, so that the upper frame 1 is held almost perpendicular to the left and right erected leg members 5, 5 and supported in a horizontal posture. 7' is a notch whlch is formed forwardly of the notch 7 in the side wall lb and used to support the upper frame 1 therethrough under a folded state. As an alternative, the hinge 5a may be arranged to make the stand foldable and reassembled by pivotally coupling the upper end portion of the leg member 5 to the lower right end portlon of the upper frame 1 by a shaft, connecting the intermediate portion of the leg member 5 and the lower side of the upper frame 1 at its intermediate portion by a foldable arm member (not shown), and bringing the foldable arm member into a folded or extended state.
On the other hand, the lower hinges Sb each comprise a small rectangular hinge plate 8 of which upper portion in the forward side is fixed to the lower end portion of the leg member 5 as indicated by 8a, while the lower frame 3 is pivotally supported at its rear end to the lower portion of the hinge plate 8 in the rearward side as indicaied by 8b.
Therefore, the lower frame 3 can be rotated 270 degrees counterclockwise from an assembled state of Fig. 1 so that it is folded into a posture substantially parailel to the leg member 5 in side by side relation. Additionally, 8c in 2072~27 Fig. 1 is a circular hole which is formed in the hinge plate 8 to provide a clic~ in operation at the time when assembling and folding of the lower frame 3 are completed.
A steel ball 3d normally biased by a spring (not shown) from the back slde of the drawlng sheet is disposed in the lower frame 3 at a position corresponding to hole 8c such that the steel ball 3d is slightly projected from the surface. The device of the present invention is thus constituted.
One example of the device of the present invention constituted as explained abo~e operates as follows. In the assembled state shown in Fig. 1, by loosening the attach-ment screws 2f and lowering them in the oblong holes le, lf, the camera unit CU constituting the reading means 2 is slid downwardly and properly positioned relative to the upper frame 1. On the other hand, a document (not shown) to be displayed in a magnified scale for reading is placed on the upper surface of the document table 4. While slid-ing the document table 4 in the X and Y directions on the slide base 4B which is withdrawn to the forward side of the lower frame 3, a position of the document surface to be read i5 aligned with an optical axis 2L of the camera 2c.
At the same time, the light source 9 is directed to the document surface for illuminating the same.
Characters and so forth on the document read by the TV
camera 2c are displayed in a magnified scale on the display plane DP of a monitor TV in the form of a CRT or the like, so that the weak-sighted can read the displayed contents of the document while being magnified using the device of the present invention. At this time, although the light emlt-ted from the light source 9 and reflected by the document surface enters eyes of the user, the reflected light will not detrimentally affect the user because the filter 10, which allows only infrared rays and the like to pass there-through, but cuts off visible light, is attached to the front side of the light source 9. Additionally, the filter lO for cutting off visible light is also suitable when applied to the prior display device in which the stand A is not of the fo]dable structure as shown in Fig. 12. This application will now be described with reference to Figs.
lO and 11.
With the prior magnifying display device as shown in Fig. 11, the normal weak-sighted can clearly see the docu-ment in a magnified scale. However, when viewers are particular types of amblyopic penple, e.g., those patients suffering from the retina pigmentary degeneration who cannot see bright light, there arises a problem that when the illumination light source C illuminates the paper surface P of the document D such as a book, the reflected llght from the paper surface P directly enters the eyes E, 20~2427 disabling those people to see the screen of the monitor TV
E. Another problem is in that even when the monochromatic image is reversed in color, they must direct their eyes E
toward the paper surface P being illuminated by the illumi-nation light source C upon pages of the document being turned over, forcing them to feel a pain due to the presence of the reflected light C1.
In the present invention, therefore, a visible-light cutting and infrared-ray transmitting filter 10, which cuts off vislble light, but allows infrared rays to pass there-through, can inserted between the document D and the paper surface P in a detachable manner to be disposed near the illumination light source 9, as shown in Fig. 10. Thus, in the case of the weak-sighted using the device, the filter 10 is located between the light source 9 and the paper surface P, whereby the paper surface P is Illumlnated wlth only infrared rays to prevent the reflected l;ght in a vlsible range from reachlng the eyes E.
As another example of the device of the present inven-tion shown in Flg. 10, besides the detachably inserted structure of the filter 10, a TV camera having sensitivity in a infrared range is employed instead of the above-stated usual TY camera 2c. This enables that characters and so forth are clearly imaged even with no illumination by visible light and the screen of the monitor TV DP is viewed 2~72427 without feelIng the light dazzled.
In Flg. 10, denoted by lOa is a holder for the fllter 10, the holder belng formed at the front end of a lamp housing 9a. The Infrared filter 10 can be posit~oned at and out of the front surface of the llght source 4 by a slidably holding mechanism of the holder lOa. Incidental-ly, lOb is a through hole where not filter is present. As an alternatlve, the filter 10 may be inserted into and removed from between the light source 9 and the paper surface P by any other desired mechanism such as the swing type. Further, the color filter 10 may be of a filter which allows light in a red or orange range to pass there-through. In other word, it is only re~uired for the color filter to cut off the reflected light in a visible range.
Then, one example of the device of the present Inven-tion explained above with reference to Figs. 1 to 7 is achieved by modifying the prior magnifying display device of the desk top type such that the stand comprising, as main parts, the reading means 2 and the document table 4 serving as a rest of the document to be read is of the freely folded and reassembled structure to be carrying it easily. The device having this portable type stand is carried to other place where an existing monitor TV or the like can be utilized as the disp~ay plane.
Considering thls aspect of the present invention, it 2~2427 will be apparent that the foldable structure of the stand according to one example of the device of the present invention ls not limited to the structure explained above with reference to Figs. 1 to 7. As another example, though not shown, the upper frame 1, the lower frame 3 and the document table 4 may be constructed in such a manner as able to join with and separate from each other and, in no use, those components are separated and put together into the laminated form. Alternatively, the foldable structure shown in Figs. B and 9 may be adopted. Moreover, though not shown, the freely folded and reassembled structure may be achieved by a combination of the pivotal structure of the components in the foregoing embodiment and the freely joined and separated structure. The foldable structure shown in Figs. 8 and 9 will be next described.
In another example of the device of the present inven-tion ~hown in Figs. 8 and 9, the lower frame 3 is consti-tuted by a front member 31 and a rear member 32 which are interconnected via a hinge 33 at a position near the rear end of the lower frame 3 and can be folded to posltion one above the other. On the other hand, in order that a hinge 5a~ provided at the upper end of a leg member 5' can be changed in its vertical attachment position in three stages, for example, the upper frame 1 housing the camera unit CU therein is provided in the left and right sides 2~72~
with a plurality of attachment holes 101 to 10~ for the hinge 5a', the holes being separated into three lines in the illustrated example which are arranged in the to-and-fro or horizontal direction and each include three holes In the vertical direction. Alternatively, each llne may include balls in two or four or more stages.
The hinge 5a' provided at the upper end of the leg member 5' has, on a plate-like hinge body 51a at positions corresponding to the attachment holes 101 to 103, pins (not appearing in the drawings) which are projected on the inner surface thereof and fitted into the attachment holes 101, 103, and a screw 52a with a knob which is screwed into the threaded hole 102 from the outer side. Also, two parallel inverted-L-shaped bar members 51, 52 jointly constituting the leg member 5' are pivotally supported at their front end pins 53a, 54a to the outer surface of the hinge body 51a. Additionally, there are provided stopper pins 55a, 56a for limiting rotation of the bar members 51, 52 at a predetermined angle.
Meanwhile, the lower ends of the bar members 51, 52 are pivotally supported by one pivot retainer 51b to the upper surface of the rear member 32 of the lower frame 3, thereby constituting a lower hinge 5a'. It will be noted that, in Figs. 8 and 9, the same reference numeral as those in Figs. 1 to 7 denote the same members.
The upper and lower frames 1, 3 interconnected by the foldable leg member 5' of the structure as explained above are assembled Into a state shown In Flg. 8. In thls assem-bled state, after removing the document table 4 out of the lower frame 3 or keeping it placed over the front member 31, the front member 31 is first turned countercloc~wise in Fig. 8 about the hinge 33 to be folded over the back or lower side of the rear member 32. Next, the upper frame I
is turned clockwise in Fig. 8 about the hinges 5a', 5b~
respectively provided at the upper and lower ends of the bar members 51, 52. As a result, the device can be folded into a state shown in Fig. 9.
Furthermore, the device of the present invention can also be arranged as described below Ior the purpose of adding more preferable functions from the viewpoint of practical use to the reading means 2 and the document table 4 of the magnifying display device in which the stand is constituted to be portable as has been previously ex-plained. This arrangement will be next described.
In one example of the device of the present invention shown in Figs. l to 7, the reading means 2 mainly compr~s-lng the camera unit CU is provided such that it can be changed in its vertical position with respect to the upper frame 1. More specifically, when a thick document P' to be read, such as a dictionary, is placed on the document table 4, the distance from the document surface to the focused point V in the camera unit CU, i.e., Ll ~ L2 = WD, is changed. Thus, the distance WD is reduced by ~Wd corre-sponding to the thickness of the document. This change of ~Wd, namely, the dlstance Ll reduced by the amount ~Wd, can be compensated for by loosening the knobs 2g of the attachment screws 2f, adjusting/correcting the vertical position of the reading means 2 upwardly through the sup-ports or oblong holes le, lf in the side and front walls, and then fixing the reading means 2 again.
In view of the same purpose, the device shown in Figs.
l to 7 can also achieve the same result by being so ar-ranged as to slide the TV camera 2c within the housing 2e in the to-and-fro direction and change the distance L2 from the focus point Y to the optical path changing mirror 2d, to thereby compensate for the above distance change ~Wd.
The sliding operation of the camera unit CU in the rearward direction corresponding to the distance ~Wd may be manual-ly performed, or automatically performed by utilizing a drive source such as a motor or small cylinder. The actu-ating mechanism may be of any desired driving type. Also, in the device of Figs. 8 and 9, the TY camera is properly positioned by selecting the vertical position of the hinge body 51a with respect to the upper frame 1 corresponding to the thic~ness of the document D.
2Q72~27 To automatically hold the distance WD from the docu-ment surface P to the focused point Y of the TV camera 2c constant at all times regardless of the thickness of the document and ensure a magnifying display function as ex-plained above with reference to F~g. 7, the devlce of the present Invention may be arranged to provlde distance measuring means, using any of mechanical, optical, magnet-lc, electrlc and ultrasonic means, at a position in the camera unit CU corresponding to the document surface P, and utilizes the difference ~Wd between the actual distance llp to the document surface P detected by the distance measur-ing means and the reference distance WD as a command varia-ble based on which the reading means 2 is moved upwardly or the T~ camera 2c is slid rearwardly.
Figs. 6 and 7 show an example of the device of the present invention adopting the simplest ~echanical distance measuring means. A distance bar 12 of the effective length WD is suspended from the housing 2e of the camera unit CU
in a foldable manner by commonly using the attachment screw 2f for the reading means 2, and the reading means 2 is vertically moved so that the lower end face of the bar 12 comes into contact with the document s~rface P or P'. Note that 12a is a shaft about which the bar 12 can be folded.
This permits the distance Ll between the document surface P
or P' and the mirror 2d to be kept constant regardless of 2072~27 the thickness of the document. In the case where the camera unit CU is vertically moved by utilizing the driving force of a motor or the like, a contact (not shown~ of an actuator swltch for the driving source may be provided on the lower end face of the bar 12 and the driving source such as a motor for moving the camera unit CU upwardly may be actuated until the contact is apart from the document surface P or P'.
As fully described above, while in prior magnifying display devices of the desk top type the stage comprising the reading means and the document rest could not be folded into a compact size for easy transportation, the device o~
the present invention is of the structure capable of being folded into a compact size, which is very convenient in that even at such locations as intrinsically equipped with no magnifying display devices, documents to be read can be displayed in a magnified scale if only the display plane given by a monitor TV or the like is present.
With the device of the present invention, since the reading span distance between the reading means and the document can be manually or automatically corrected to be held constant at all times regardless of the thickness of the document, any documents ranging from thin ones such as newspapers to thick ones such as dictionaries can be freely displayed in a magnified scale in spite of changes in the thickness of the documents while quickly responding to such changes.
Also, slncç the light source for Illumlnating the document surface is associated with the fllter member In a detachable manner which cuts off most of vlsible light, but allows only light that is necessary and sufficient for illuminating the document to sense its image, such as infrared rays, to pass therethrough, there will not occur a drawback that the light illuminated and reflected by the document may enter eyes of a user, making it hard to see the displayed image.
Claims (7)
1. A magnifying display device wherein an upper frame on which reading means such as TV camera is mounted and which is substantially rectangular in a plan view and a document rest on which a document to be read is placed and which is substantially rectangular in a plan view are supported through leg members such that said frame and said rest are substantially parallel to each other with an appropriate vertical spacing kept said frame and said rest, and said frame, said rest and said leg members are interconnected in such a manner as able to be folded into a laminated state.
2. A magnifying display device according to claim 1, wherein said reading means is attached to said upper frame to be slidable in the vertical direction and selectively fixed at a proper position for holding the distance between a focused point in said reading means and the document to be read.
3. A magnifying display device according to claim 1, wherein said document rest is attached to a lower frame to be slidable in the vertical direction and selectively fixed at a proper position for holding the distance between a focused point in said reading means and the document to be read.
4. A magnifying display device according to any one of claims 1 to 3, wherein said document rest is attached to a lower frame to be slidable in a plane and selectively fixed at a proper position, said lower frame being pivotally coupled to the lower ends of said leg members.
5. A magnifying display device according to any one of claims 1 to 4, wherein said upper frame and said document rest or a lower frame mounting said document rest thereon are arranged in vertically spaced relation substantially parallel to each other and interconnected by said leg members in such a manner as able to have a channel-shaped or Z-shaped configuration in a side view.
6. A magnifying display device comprising reading means and a document rest provided in opposite relation on upper and lower frames with an appropriate adjustable vertical spacing kept between said reading means and said document rest, wherein bar-like distance measuring means of the rotary foldable type having a predetermined length is attached to said upper frame to measure the distance be-tween said reading means and the reading surface of a document on said document rest.
7. A magnifying display device comprising reading means and a document rest provided in opposite relation with an appropriate vertical spacing kept between said reading means and said document rest, wherein a light source for illuminating a document is provided above said document rest, and a color filter, which cuts off most of visible light, but allows only infrared rays and light in a red or orange range to pass therethrough, is detachably attached to the front side of said light source.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991061017U JP2590148Y2 (en) | 1991-07-09 | 1991-07-09 | Magnifying display |
| JP3-61017 | 1991-07-09 | ||
| JP4122784A JP2857959B2 (en) | 1992-04-17 | 1992-04-17 | Magnifying display |
| JP4-122784 | 1992-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2072427A1 true CA2072427A1 (en) | 1993-01-10 |
Family
ID=26402062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2072427 Abandoned CA2072427A1 (en) | 1991-07-09 | 1992-06-26 | Magnifying display device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2072427A1 (en) |
-
1992
- 1992-06-26 CA CA 2072427 patent/CA2072427A1/en not_active Abandoned
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