CA2014370C - Opaque projector - Google Patents
Opaque projectorInfo
- Publication number
- CA2014370C CA2014370C CA 2014370 CA2014370A CA2014370C CA 2014370 C CA2014370 C CA 2014370C CA 2014370 CA2014370 CA 2014370 CA 2014370 A CA2014370 A CA 2014370A CA 2014370 C CA2014370 C CA 2014370C
- Authority
- CA
- Canada
- Prior art keywords
- projected
- stage
- angle
- opaque projector
- projecting
- 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 - Fee Related
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed. There is a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane. The opaque projector has a mechanism capable of changing the angle of the stage on which the object to be projected can be placed in such a manner that the object to be projected, the optical axis of the projecting lens and the projection plane meet a Scheimpflug condition.
An opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed. There is a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane. The opaque projector has a mechanism capable of changing the angle of the stage on which the object to be projected can be placed in such a manner that the object to be projected, the optical axis of the projecting lens and the projection plane meet a Scheimpflug condition.
Description
OPAQUE PROJECTOR 2 01~ 3 7 ~
The pre~ent invention relates to an opaque projector having a stage which transmits illumination light from a light i~ource and on which an object to be projected can be placed, a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane.
An opaque projector of the type described above is an apparatus arranged in such a manner that an original document placed on the stage is illuminated by a strong illuminating light ~ource and scattered light thuis generated i8 converged j. :
by a projecting lens having a large aperture 80 that the original is projected on a screen. An.opaque projector must -meet the following conditions: -~
~1) Since scattered light from the surface of an original document is utilized, the efficiency of light i8 ~ .
inHufficient. In order to compensate the insufficient light .-efficiency, a light source of, for example, 1000 to 1500W is necessary in ordinary cases.
~2) In order to efficiently converge scattered light ~ ''.' ''':
The pre~ent invention relates to an opaque projector having a stage which transmits illumination light from a light i~ource and on which an object to be projected can be placed, a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane.
An opaque projector of the type described above is an apparatus arranged in such a manner that an original document placed on the stage is illuminated by a strong illuminating light ~ource and scattered light thuis generated i8 converged j. :
by a projecting lens having a large aperture 80 that the original is projected on a screen. An.opaque projector must -meet the following conditions: -~
~1) Since scattered light from the surface of an original document is utilized, the efficiency of light i8 ~ .
inHufficient. In order to compensate the insufficient light .-efficiency, a light source of, for example, 1000 to 1500W is necessary in ordinary cases.
~2) In order to efficiently converge scattered light ~ ''.' ''':
2~1437~
reflected by the surface of the original document, the following projecting lens having a large aperture and a great f-number must be employed:
(Practical Level) (illuminating light source : 1000 to 1500W) Aperture : 100 to 140 ~
f : 300 to 350 mm f-number : 1.4 to 3 (3) In order to use the above-described large aperture lens, the depth of focus of the projecting lens is very small as a result of a comparison made in terms of the OHP. For example, the practical depth of focus is 20 to 40mm in terms of the cost and the number of the lenses in the case where a lens of f = 330, the aperture is 120 ~ and f-number is 2.9 is used.
As described above, since the depth of focus is very small in the conventional opaque projectors, the following ad~ustments and the arrangements are necessary in order to obtain a satisfactory projected image without any out of focus.
(1.) The optical axis of the projecting lens and the screen is vertically instersected each other and the pro~ection optical paths are the same length in any directlonæ on the screen at the same distance from the optical axls (at least within the error of the depth of 201~37~
focus).
(2) The elevation angle of the projecting lens, that is, the elevation angle of the opaque projector body must be adjusted in accordance with the height of the body and the desired height of the plane of projection. Furthermore, the screen must be adjusted so as to be made vertical with respect to the optical axis of the projecting lens, causing an extremely difficult and complicated task to become necessary.
(3) The quality of the projected image considerably depends upon the structure of the screen whose angle can be adjusted. However, the maximum angle of the inclination of the screen is about 15 in consideration of the insufficient quality of the image due to the inclination of the screen lS caused from the size, the weight and the involved deflection of the surface of the screen.
reflected by the surface of the original document, the following projecting lens having a large aperture and a great f-number must be employed:
(Practical Level) (illuminating light source : 1000 to 1500W) Aperture : 100 to 140 ~
f : 300 to 350 mm f-number : 1.4 to 3 (3) In order to use the above-described large aperture lens, the depth of focus of the projecting lens is very small as a result of a comparison made in terms of the OHP. For example, the practical depth of focus is 20 to 40mm in terms of the cost and the number of the lenses in the case where a lens of f = 330, the aperture is 120 ~ and f-number is 2.9 is used.
As described above, since the depth of focus is very small in the conventional opaque projectors, the following ad~ustments and the arrangements are necessary in order to obtain a satisfactory projected image without any out of focus.
(1.) The optical axis of the projecting lens and the screen is vertically instersected each other and the pro~ection optical paths are the same length in any directlonæ on the screen at the same distance from the optical axls (at least within the error of the depth of 201~37~
focus).
(2) The elevation angle of the projecting lens, that is, the elevation angle of the opaque projector body must be adjusted in accordance with the height of the body and the desired height of the plane of projection. Furthermore, the screen must be adjusted so as to be made vertical with respect to the optical axis of the projecting lens, causing an extremely difficult and complicated task to become necessary.
(3) The quality of the projected image considerably depends upon the structure of the screen whose angle can be adjusted. However, the maximum angle of the inclination of the screen is about 15 in consideration of the insufficient quality of the image due to the inclination of the screen lS caused from the size, the weight and the involved deflection of the surface of the screen.
(4) When a projection of an image is performed with making a certain elevation angle on a screen positioned vertically (the screen is positioned vertically in major cases), it is impossible to focus an object to be projected on the entire surface of the plane of projection, causing excessive inconvenience to occur.
An ob~ect of the present invention is to provide an opaque pro~ector capable of easily and readily forming a 2~ ~37~
projected image without out of focus on the screen by adjusting the angle of the stage on which an original document is placed even if the ~creen i~ not placed without any correspondence to the elevation angle of the opaque S projector body, that i~, the screen i~ not po~itioned vertically with respect to the optical axis of the projecting lens.
Other and further object~, feature~ and advantages of the invention will be appear more fully from the following drawing~, in which:
Fig. 1 is a perspective view which illustrate~ the structure of an opaque projector according to the present invention; and Fig. 2 illustrates the operation of the opaque projector according to the pre~ent invention.
According to the present invention, there is provided an opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed, a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane, the opaque projector r 5 ~
2 0 1 ~ 3 7 ,\
comprising: a mechanism capable of changing the angle of the stage on which the object to be projected can be placed in such a manner that the object to be projected, the optical axis of the projecting lens and the projection place meet a Scheimpflug condition.
The preferred embodiment of the present invention will now be described with reference to the drawings.
The "Scheimpflug condition" means a condition in which the surface of the inclined object, the image plane, and the principal planes of the lenses (or their exten~ion planes) coincide with one another on a line.
As shown in the drawings, the opaque projector according to the present invention comprises a projecting lens having a focus-adjustment lever 2 on its front surface, the opaque projector further having a stage 3 on which an object to be projected ~omitted from illustration) can be placed on the upper siurface thereof.
An end portion of the stage 3 is pivoted by a supporting shaft 4 adjacent to the projecting lens 1 80 that angle Q
made from the upper surface of the opaque projector body i8 adjusted. The opaque projector body includes a reflecting mirror 8 for reflecting the original document (an object to be projected) placed on the stage 3 at an inclination angle of 45 with respect to the optical axis 13 of the len~ 1. As a result, light reflected by the reflecting mirror B i~ converged by the projecting lens 1 `X
201~370 that the original document is proJected on screen S1. In this case, the stage 3 and the optical axis 13 of the projecting lens 1 run parallel to each other. A stage-angle adjustment mechanism for moving the stage 3 with respect to the supporting axis 4 comprises an eccentric cam 6 and a stage-angle adjustment lever 5 each of which is disposed in the opaque projector body in a place opposite to the supporting shaft 4 for the stage 3. The stage 3 is always pulled downwards by a spring 7 so as to be stabilized.
Furthermore, the stage 3 is provided with a focusing indexes 10 and 11 at its two end portions including the above-described end portion pivoted by the supporting shaft 4.
Only a half portion of an illuminating light source 16 for illuminating the original document with respect to the stage 3 is illustrated in Fig. 1, and it is omitted from Fig.
2.
Then, the operation (adjustment means) of the opaque projector according to the present invention will be described with reference to Fig. 2.
As shown in Fig. 2, in the case where an ob~ect is projected on the screen S1 positioned vertically with an elevation angle (an elevation angle with respect to the optical axis 13 of the proJecting lens 1) of the opaque pro~ector according to the present invention arranged to be 2~1 ~37~
~2~ the object to be projected and placed on the stage 3 is reflected by the reflecting mirror 8 80 as to be projected on the ~creen Sl by the projecting lens 1. Then, the focusing index 10 positioned above the supporting shaft 4 of the stage 3, whose back-foaus distance projected in the upper portion of the screen Sl i8 not changed, is adjusted by the focus adjustment lever 2. Then, the eccentric cam 6 is rotated by the ~tage angle adjustment lever 5 connected to the eccentric cam 6 of the ~ta~e angle adjustment mechanism 80 that the rear portion of the ~tage 3 i8 moved upwardly. Thus, the stage angle Q is changed ~o as to gradually incline the stage ---3. As a result, a stage position 3' i~ achieved at which the focus adjustment index 11 i~ focused on the screen Sl- Thu~
the focusing operation i8 ended.
The above-de cribed operations are performed with the projecting mirror 8 disposed between the object to be projected and the projecting lens 1. That i8, the above-de~cribed operation~ are the operations in which ~tage virtual images 3i and 3i' and focusing index virtual images lOi and lli are being operated. In this case, the virtual image of the object on the stage 3' and formed by the projecting mirror 8 iff positioned on the stage Therefore, each of the extension plane of the stage 3i', the image surface of the screen Sl, and the principal plane of the pro~ecting lens 12 coincide with one another on a line.
201~i37~
As a result, the Scheimpflug condition i8 ~atisfied.
A screen S2 represent~ the inclination of the screen when the opaque projector having no stage angle adjustment mechanism i~ u~ed inclined by an angle of 92 to project the object. In thi~ case, since the relationship 91 = ~2 must be held, the adjustment of the ~creen S2 has been inconvenient.
Even if the inclination Q of the stage 3 i8 an optional angle, the focusing can be ea~ily performed by aajusting the stage 3 as described above. Therefore, the complicated adjustment of the angle ~1 of the screens S2 can be ---eliminated.
In the case where the object to be projected i8 placed on the stage 3, the focusing can also be conducted by observing the focused state of the object after the focu~ing index il ha~ been focused.
Although the reflecting mirror 8 and the optical axis 13 make an angle of 45 according to this embodiment, the pre~ent invention i8 not limited to this description.
As described above, it has been tedious to adjust the angle of the screen ~ince the screen is very large and heavy.
Furthermore, ~ince the angle must be adjusted in accordance with the elevation angle of the opaque projector body, con~iderable skill has been necessary. However, according to the pre~ent invention, lack of focus can be 201~37~
prevented and the adjustment of khe screen can be eliminated only by adju~ting the angle of the stage.
Although the invention has been described in its preferred form with a certain degree of particularly, it is understood that the present disclosure of the preferred form has been ~hanged in the details of construction and the combination and arrangement of parts may be rei~orted to without departing from the spirit and the Qcope of the invention as hereinafter claimed.
9 ,~ .. .
, , ..~; ' ',' ~' ' .
An ob~ect of the present invention is to provide an opaque pro~ector capable of easily and readily forming a 2~ ~37~
projected image without out of focus on the screen by adjusting the angle of the stage on which an original document is placed even if the ~creen i~ not placed without any correspondence to the elevation angle of the opaque S projector body, that i~, the screen i~ not po~itioned vertically with respect to the optical axis of the projecting lens.
Other and further object~, feature~ and advantages of the invention will be appear more fully from the following drawing~, in which:
Fig. 1 is a perspective view which illustrate~ the structure of an opaque projector according to the present invention; and Fig. 2 illustrates the operation of the opaque projector according to the pre~ent invention.
According to the present invention, there is provided an opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed, a projecting mirror for reflecting light reflected by the object to be projected, and a projecting lens for converging reflected light from the projecting mirror and imaging a projected image of the object on an external projection plane, the opaque projector r 5 ~
2 0 1 ~ 3 7 ,\
comprising: a mechanism capable of changing the angle of the stage on which the object to be projected can be placed in such a manner that the object to be projected, the optical axis of the projecting lens and the projection place meet a Scheimpflug condition.
The preferred embodiment of the present invention will now be described with reference to the drawings.
The "Scheimpflug condition" means a condition in which the surface of the inclined object, the image plane, and the principal planes of the lenses (or their exten~ion planes) coincide with one another on a line.
As shown in the drawings, the opaque projector according to the present invention comprises a projecting lens having a focus-adjustment lever 2 on its front surface, the opaque projector further having a stage 3 on which an object to be projected ~omitted from illustration) can be placed on the upper siurface thereof.
An end portion of the stage 3 is pivoted by a supporting shaft 4 adjacent to the projecting lens 1 80 that angle Q
made from the upper surface of the opaque projector body i8 adjusted. The opaque projector body includes a reflecting mirror 8 for reflecting the original document (an object to be projected) placed on the stage 3 at an inclination angle of 45 with respect to the optical axis 13 of the len~ 1. As a result, light reflected by the reflecting mirror B i~ converged by the projecting lens 1 `X
201~370 that the original document is proJected on screen S1. In this case, the stage 3 and the optical axis 13 of the projecting lens 1 run parallel to each other. A stage-angle adjustment mechanism for moving the stage 3 with respect to the supporting axis 4 comprises an eccentric cam 6 and a stage-angle adjustment lever 5 each of which is disposed in the opaque projector body in a place opposite to the supporting shaft 4 for the stage 3. The stage 3 is always pulled downwards by a spring 7 so as to be stabilized.
Furthermore, the stage 3 is provided with a focusing indexes 10 and 11 at its two end portions including the above-described end portion pivoted by the supporting shaft 4.
Only a half portion of an illuminating light source 16 for illuminating the original document with respect to the stage 3 is illustrated in Fig. 1, and it is omitted from Fig.
2.
Then, the operation (adjustment means) of the opaque projector according to the present invention will be described with reference to Fig. 2.
As shown in Fig. 2, in the case where an ob~ect is projected on the screen S1 positioned vertically with an elevation angle (an elevation angle with respect to the optical axis 13 of the proJecting lens 1) of the opaque pro~ector according to the present invention arranged to be 2~1 ~37~
~2~ the object to be projected and placed on the stage 3 is reflected by the reflecting mirror 8 80 as to be projected on the ~creen Sl by the projecting lens 1. Then, the focusing index 10 positioned above the supporting shaft 4 of the stage 3, whose back-foaus distance projected in the upper portion of the screen Sl i8 not changed, is adjusted by the focus adjustment lever 2. Then, the eccentric cam 6 is rotated by the ~tage angle adjustment lever 5 connected to the eccentric cam 6 of the ~ta~e angle adjustment mechanism 80 that the rear portion of the ~tage 3 i8 moved upwardly. Thus, the stage angle Q is changed ~o as to gradually incline the stage ---3. As a result, a stage position 3' i~ achieved at which the focus adjustment index 11 i~ focused on the screen Sl- Thu~
the focusing operation i8 ended.
The above-de cribed operations are performed with the projecting mirror 8 disposed between the object to be projected and the projecting lens 1. That i8, the above-de~cribed operation~ are the operations in which ~tage virtual images 3i and 3i' and focusing index virtual images lOi and lli are being operated. In this case, the virtual image of the object on the stage 3' and formed by the projecting mirror 8 iff positioned on the stage Therefore, each of the extension plane of the stage 3i', the image surface of the screen Sl, and the principal plane of the pro~ecting lens 12 coincide with one another on a line.
201~i37~
As a result, the Scheimpflug condition i8 ~atisfied.
A screen S2 represent~ the inclination of the screen when the opaque projector having no stage angle adjustment mechanism i~ u~ed inclined by an angle of 92 to project the object. In thi~ case, since the relationship 91 = ~2 must be held, the adjustment of the ~creen S2 has been inconvenient.
Even if the inclination Q of the stage 3 i8 an optional angle, the focusing can be ea~ily performed by aajusting the stage 3 as described above. Therefore, the complicated adjustment of the angle ~1 of the screens S2 can be ---eliminated.
In the case where the object to be projected i8 placed on the stage 3, the focusing can also be conducted by observing the focused state of the object after the focu~ing index il ha~ been focused.
Although the reflecting mirror 8 and the optical axis 13 make an angle of 45 according to this embodiment, the pre~ent invention i8 not limited to this description.
As described above, it has been tedious to adjust the angle of the screen ~ince the screen is very large and heavy.
Furthermore, ~ince the angle must be adjusted in accordance with the elevation angle of the opaque projector body, con~iderable skill has been necessary. However, according to the pre~ent invention, lack of focus can be 201~37~
prevented and the adjustment of khe screen can be eliminated only by adju~ting the angle of the stage.
Although the invention has been described in its preferred form with a certain degree of particularly, it is understood that the present disclosure of the preferred form has been ~hanged in the details of construction and the combination and arrangement of parts may be rei~orted to without departing from the spirit and the Qcope of the invention as hereinafter claimed.
9 ,~ .. .
, , ..~; ' ',' ~' ' .
Claims (2)
1. An opaque projector having a stage which transmits illumination light from a light source and on which an object to be projected can be placed, a projecting mirror for reflecting light reflected by said object to be projected, and a projecting lens for converging reflected light from said projecting mirror and imaging a projected image of said object on an external projection plane, said opaque projector comprising:
a mechanism capable of changing the angle of said stage on which said object to be projected can be placed in such a manner that said object to be projected, the optical axis of said projecting lens and said projection plane meet a Scheimpflug condition.
a mechanism capable of changing the angle of said stage on which said object to be projected can be placed in such a manner that said object to be projected, the optical axis of said projecting lens and said projection plane meet a Scheimpflug condition.
2. An opaque projector according to Claim 1, wherein a focusing index is provided above a supporting point of said stage angle changing mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP70,138 | 1989-06-15 | ||
| JP7013889U JPH0311237U (en) | 1989-06-15 | 1989-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2014370A1 CA2014370A1 (en) | 1990-12-15 |
| CA2014370C true CA2014370C (en) | 1993-11-02 |
Family
ID=13422911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2014370 Expired - Fee Related CA2014370C (en) | 1989-06-15 | 1990-04-12 | Opaque projector |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH0311237U (en) |
| CA (1) | CA2014370C (en) |
| DE (1) | DE4013426A1 (en) |
| FR (1) | FR2648577A1 (en) |
| GB (1) | GB2232780B (en) |
| HK (1) | HK1000427A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG114471A1 (en) * | 2000-09-08 | 2005-09-28 | Vista Technology Co Ltd | Projector with image source from objects |
| JP2002214708A (en) * | 2001-01-12 | 2002-07-31 | Sony Corp | Projector |
| DE102010022735B4 (en) | 2010-06-04 | 2022-07-07 | Volkswagen Ag | Method for projecting a graphic onto a projection surface, in particular onto a surface of a motor vehicle and method for manufacturing a motor vehicle |
| RU2552012C1 (en) * | 2014-01-10 | 2015-06-10 | Николай Борисович Болотин | Hydrogen gas-turbine engine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB542211A (en) * | 1938-03-15 | 1941-12-31 | Anciens Ets Barbier | Improvements in or relating to optical projection apparatus |
| DE1797080A1 (en) * | 1968-08-13 | 1972-01-20 | Enna Werk Optik Apelt | Episcope |
| US4002408A (en) * | 1971-10-14 | 1977-01-11 | Gakken Co. Ltd. | System and device for overhead projection |
| DE3136970C2 (en) * | 1981-09-17 | 1984-09-13 | Fa. Ed. Liesegang, 4000 Düsseldorf | Device for adjusting the lens position in relation to the original plane on the device head of a projector |
| JPS59165042A (en) * | 1983-03-11 | 1984-09-18 | Fuji Xerox Co Ltd | Projector for deskwork |
| DE3316246A1 (en) * | 1983-05-04 | 1984-11-22 | Hartmut Dr. 2352 Bordesholm Wiedling | Focus-correcting device for inclined projection in overhead projectors |
-
1989
- 1989-06-15 JP JP7013889U patent/JPH0311237U/ja active Pending
-
1990
- 1990-04-10 GB GB9008087A patent/GB2232780B/en not_active Expired - Fee Related
- 1990-04-12 CA CA 2014370 patent/CA2014370C/en not_active Expired - Fee Related
- 1990-04-26 DE DE19904013426 patent/DE4013426A1/en active Granted
- 1990-04-30 FR FR9005486A patent/FR2648577A1/en active Pending
-
1997
- 1997-10-28 HK HK97102041A patent/HK1000427A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB9008087D0 (en) | 1990-06-06 |
| GB2232780B (en) | 1993-08-04 |
| CA2014370A1 (en) | 1990-12-15 |
| GB2232780A (en) | 1990-12-19 |
| DE4013426A1 (en) | 1990-12-20 |
| DE4013426C2 (en) | 1993-07-08 |
| JPH0311237U (en) | 1991-02-04 |
| FR2648577A1 (en) | 1990-12-21 |
| HK1000427A1 (en) | 1998-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |