JP3406937B2 - Projection device having light beam shape conversion means and image reading device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection apparatus having a light beam shape conversion means and an image reading apparatus using the projection apparatus, and particularly to a two-dimensional system even when the screen size of a film (object) is wide. By converting the square type light beam shape into a one-dimensional linear type light beam shape, the space of the illuminating means can be downsized, and extremely efficient illumination can be performed, and the image information of the document can be displayed on the photoelectric conversion means surface. It is suitable for a device such as an image scanner, a copying machine, a facsimile, etc., which is configured to project an image and read the image information.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus such as an image scanner, a copying machine or a facsimile, a plurality of light beams reflected from a reflection type original image or a transmission type light beam from a transmission type original film are projected by a plurality of projection means. Image information of the original is read by projecting and forming an image on the surface of a photoelectric conversion means such as a line sensor (CCD) in which pixels (light receiving elements) are arranged one-dimensionally.

In this case, in the longitudinal direction of the line sensor (main scanning direction), the detection data from the light receiving elements corresponding to the respective pixels are sequentially electrically scanned (converted), and the lateral direction of the line sensor is also changed. Regarding the (sub-scanning direction), the image information is two-dimensionally read by mechanically performing relative scanning movement between the original image (original film) and the line sensor.

When the manuscript size to be handled varies widely from 35 mm size (normal size) to 4 ″ × 5 ″ (large size), the size of each manuscript and the detection line length of the line sensor are matched. For this purpose, a plurality of image forming lenses (projection lenses) having different image forming magnifications are prepared, and the image forming lenses to be used are switched according to the size of each manuscript, and the photoelectric conversion means such as a line sensor (CCD) is used. The image information of the original is being read.

Further, a plurality of manuscript illuminating means (light sources) having different illuminating areas according to each manuscript size are prepared, and the manuscript illuminating means is switched according to the manuscript size to illuminate the manuscript with a desired irradiation light amount. The line sensor (CC
The image information of the document is read by photoelectric conversion means such as D).

[0006]

Generally, in a projection apparatus, a large-sized light source and a normal-sized light source are respectively provided and selected according to the screen size to be used, the size of the entire apparatus becomes large.

In particular, in order to illuminate image information of a large-sized original (large-sized original) two-dimensionally uniformly over the entire reading area, a large light source is required, and a power source for supplying power to this is also required. As the scale increases, power consumption increases, and the angle of view of the illumination area also needs to be as large as the diagonal length of the document, the illumination optical path length also increases accordingly.
Therefore, the illumination means becomes large and expensive.

The present invention employs a Koehler illumination system which illuminates a two-dimensional square illumination light flux shape when a document size is a normal size by appropriately setting each element constituting the projection apparatus, By adopting a Koehler illumination system that illuminates the illumination light flux into a one-dimensional linear shape for a large size, the illuminating means can be downsized even when the document size is wide and large. Projection apparatus having light beam shape conversion means capable of increasing illumination efficiency to reduce power consumption, maintaining projection performance with high accuracy, and reading image information on a document surface with high accuracy, and image reading using the same The purpose is to provide a device.

[0009]

An optical form of the invention according to claim 1
The projection device having the shape conversion unit condenses the light flux from the light emitting unit by the condensing unit to illuminate the first transmissive original , and the illuminated first transmissive original by the first projection lens. When projecting onto a predetermined surface, the condensing means is set so that the light emitting portion and the entrance pupil of the first projection lens are substantially conjugate with each other, and the light flux from the light emitting portion is in condensing unit is condensed by the optical path switching means and guided to a different second optical path from the first optical path of the first optical system, the light emission having anisotropy in collection and distribution properties provided in the second optical path After changing the illumination luminous flux shape through an optical means having at least one optical element having a concave surface facing the side, a second transmission different from the illuminated area of the first transmission type original through a Fresnel lens. illuminates the mold original, predetermined surface by a second projection lens a second transmission type manuscript provided on the second optical path which is the illumination A <br/> projection apparatus and a second optical system for projecting the power arrangement in the second optical system
Is set by the condensing means such that the light emitting portion and the entrance pupil of the optical means have a substantially conjugate relationship, and the Fresnel lens is
It is characterized more by the entrance pupil of the exit pupil and the second projection lens of the optical means is set to be substantially conjugate relationship.

The invention of claim 2 resides in the invention of claim 1.
The optical element is made up of a cylindrical lens.
It is characterized by that. The invention of claim 3 is the same as that of claim 2.
In the invention, the optical means is two optical elements having the same shape.
Characterized by being made up of children. From claim 4
In the invention of claim 1, the light is the light emitting means.
Condenser lens, heat insulating glass, and
It is characterized by having a field lens.

An image reading apparatus according to a fifth aspect of the present invention illuminates a light beam from a light emitting unit on a first transmissive original document supported by an original document support member via a light converging means, and the illuminated first document . Transmission of
The image information of the original document is projected and imaged on the surface of the photoelectric conversion means by the first projection lens, and when the image information of the first transmissive original document is read, the condensing means is provided with the light emitting unit and the first projection lens. The first optical system set so as to have a substantially conjugate relationship with the entrance pupil, and the luminous flux from the light emitting section is condensed by the condensing means, and the first optical path of the first optical system is constituted by the optical path switching means. the different second guided to the optical path, the illumination light beam shape through the optical means having at least one optical element having a concave surface facing to the light emitting portion having anisotropy in collection and distribution properties provided in the second optical path After changing
The second transmissive original document supported on the original document support different from the illuminated area of the first object is illuminated via the Fresnel lens, and the image information of the illuminated second transmissive original document is transferred to the second image. A second projection lens provided in the optical path projects and forms an image on the surface of the photoelectric conversion means to read image information of the second transmissive original.
A second optical system, an image reading apparatus having a second
The power arrangement in the optical system is set so that the light emitting portion and the entrance pupil of the optical means have a substantially conjugate relationship by the condensing means, and the exit pupil of the optical means and the second projection lens by the Fresnel lens. set so that the entrance pupil is substantially conjugate relationship
It is characterized by that.

[0012]

FIG. 1 is a perspective view of the essential parts of a first embodiment when a projection apparatus having a light beam shape converting means of the present invention is applied to an image reading apparatus for a transmissive original.

In this embodiment, as will be described later, the first small size
The original document (first object) is a transparent 35 mm film,
The large-sized second original (second object) is a transmissive 4 × 5 inch film (hereinafter referred to as 4 × 5 film). The overall configuration of this embodiment will be described below using this.

In this embodiment, in the plane orthogonal to the optical axis, the same direction as the arrangement direction of a plurality of pixels (light receiving elements) of the photoelectric conversion means (CCD) 17, which will be described later, is orthogonal to the main scanning direction. The direction is the sub-scanning direction.

In the figure, reference numeral 200 denotes a light source means, and a light source (lamp) 2 as a light emitting portion and a light flux (illumination light flux) emitted from the light source 2 in a direction opposite to the film (object) side are effectively directed to the film side. It consists of a reflector (reflector shade) 1 for collecting light, and a 35 mm film (first object) 11 or 4
The × 5 inch film (second object) 35 is illuminated with a predetermined optimum amount of light.

Reference numeral 201 denotes a light collecting means, which has a condenser lens 3, a heat insulating glass 4, and a field lens 5.

The light collecting means 201 constitutes a Koehler illumination system. The heat-insulating glass 4 cuts unnecessary light beams in the infrared light region emitted from the light source and protects a film, a CCD (line sensor), and the like described later. The field lens 5 assists the optical function of the condenser lens 3.

In the present embodiment, the light source 2 and a later-described 35
The pupil of the mm imaging lens (first projection lens) 15 constitutes a Koehler illumination system which is optically conjugate with the condensing means 201. That is, as will be described later, the image of the light source 2 is formed on the pupil plane of the 35 mm imaging lens 15 by the condensing means 201.

A cyan filter 8 corrects the color of the base film when a negative film is used as an original. Reference numeral 9 denotes an ND filter, which corrects the light amount of the illumination luminous flux when the film original is a positive film. In this embodiment, the two filters 8 and 9 are controlled by the filter switching motor 6 and the like so as to be mutually exclusive in the optical path.

The filter switching motor 6 is a drive source for performing this exclusive drive, and a pinion gear fixed to the output shaft of the filter switching motor 6 holds each of the cyan filter 8 and the ND filter 9. It meshes with a rack on the body. In this embodiment, exclusive control of the cyan filter 8 and the ND filter 9 is realized by the switching control of the rotation direction of the filter switching motor 6.

Reference numeral 10 is a diffusion plate, which is a 35 mm film 1.
When 1 is illuminated, the light flux (illumination light flux) from the light collecting means 201 is diffused to make particles of the 35 mm film 11 and dust attached to the film 11 inconspicuous.

In this embodiment, a 4 × 5 film 35 described later is used.
Also when illuminating the cyan filter 8 shown above.
Alternatively, either one of the ND filters 9 is controlled to be positioned in the illumination optical path, but the diffusion plate 10 is retracted outside the optical path when the 4 × 5 film 35 is used as a document. This means that when the diffuser plate 10 is in the illumination optical path, the amount of illumination light is 1/10 to 1/20 as compared with the case where the diffuser plate 10 is not provided, until the illumination light flux reaches the 4 × 5 film 35.
It will be reduced to. The diffusing plate driving motor 7 drives the diffusing plate 10 into the optical path, and the diffusing plate driving motor 7 is provided with a rack and pinion mechanism as in the case of the filter switching motor 6 described above.

Reference numeral 11 is a transmission type 35 mm as the first object.
The film is a film, and the surface of the film is illuminated two-dimensionally (square shape) by the illumination light flux from the light collecting means 201.

Reference numeral 52 denotes a filter detection sensor, which detects which of the cyan filter 8 and the ND filter 9 is located in the illumination optical path. Reference numeral 53 denotes a diffusion plate detection sensor, which detects whether or not the diffusion plate is currently located in the illumination optical path.

Reference numeral 76 is a film detection sensor, and 35
It is detected whether or not the mm film 11 exists in the illumination optical path. In this embodiment, when illuminating the 4 × 5 film 35, the 35 mm film 11 is removed from the optical path. For example, when the mode for reading the 4 × 5 film 35 is switched, the 35 mm film 11 exists in the illumination optical path. If so, the message is displayed to the operator.

Next, each optical element will be described along the optical path when reading the 35 mm film 11.

Reference numeral 12 denotes a rotatable optical path switching mirror as an optical path switching means, which rotates as shown by an arrow 13 in the figure, and when it is rotated to a position indicated by a solid line, a light beam (illuminates (transmits) the 35 mm film 11 (transmitted). The illuminating light beam) is directed toward the imaging lens (first projection lens) 15 side for 35 mm, and the position 1 indicated by the dotted line
When rotated to 2 ', the luminous flux is guided to the 4x5 film 35 side.

Reference numeral 14 is a first optical path bending mirror, and 3
The light beam that has passed through the 5 mm film 11 is bent toward the imaging lens 15 for 35 mm. The image forming lens 15 for 35 mm forms an image of the image information of the 35 mm film 11 on the surface of a CCD (line sensor) 17 as a photoelectric conversion means described later. Reference numeral 16 is a second optical path bending mirror that CCs the light flux that has passed through the imaging lens 15 for 35 mm.
It is bent to the D17 side.

The CCD 17 includes a plurality of light receiving elements (pixels).
The photoelectric conversion elements are arranged dimensionally in the main scanning direction, and the image information of the imaged original is converted into an electric signal, which is fixed to a CCD carriage 18 described later. The photoelectric conversion means in the present embodiment may be composed of one line sensor, or three line sensors for red (R), green (G), and blue (B) may be provided on the same substrate surface. You may comprise from the 3 line sensor arrange | positioned so that it may become parallel.

The CCD carriage 18 is supported below and above the rails, and is configured to be movable in the direction of arrow 30 (sub-scanning direction) in the figure by a linear movement mechanism (not shown).

In the present embodiment, the axial directions below and above the rail and the optical axis of the imaging lens 15 for 35 mm are parallel to each other, and the second optical path bending mirror 16 is provided.
Has bent its optical axis at a right angle. Therefore, if there is an error in the image forming position of the 35 mm film image,
If the optical path bending mirror 16 is moved in the direction of the arrow 30 (sub-scanning direction) in the drawing and the scanning movement range of the CCD carriage 18 corresponding to this movement is shifted, the imaging state (optical path) of the optical system (first optical system) Length) can be adjusted. In this way, the optical path length of the optical system can be adjusted with a simple adjusting mechanism.

Next, each optical element after the optical path switching mirror 12 will be described along the optical path when reading the 4 × 5 film 35.

Reference numeral 31 is an optical means, and two cylindrical lenses 31a, which are anamorphic optical elements,
31b and has a negative refracting power only in a predetermined direction (main scanning direction). Cylindrical lenses 31a, 31
b has the same shape, and is arranged with the concave surface facing the light source 2 side.

Cylindrical lens 3 in this embodiment
1a and 31b diverge the Koehler illumination luminous flux (illumination luminous flux) only in the main scanning direction, and are arranged in the vicinity of the position where the aerial image of the light source 2 is formed by the condensing means 201.

Reference numeral 32 denotes a third optical path bending mirror, which bends the illumination light flux passing through the cylindrical lenses 31a and 31b to the 4 × 5 film 35 side. Reference numeral 33 is a concentric Fresnel lens (optical element) that efficiently focuses an illumination light beam diverging in the main scanning direction on a 4 × 5 imaging lens (second projection lens) 39 described later.
Reference numeral 34 denotes a diffusion plate, which has the same optical action as the diffusion plate 10 for the 35 mm film 11 described above.

Reference numeral 35 denotes a transmissive 4 × 5 film as a second object movable in the sub-scanning direction, and the length of the illuminated area of the 4 × 5 film 35 in the main scanning direction is 35 m.
It is longer than the length of the illuminated area of the m-film 11 in the main scanning direction.

In the present embodiment, when the 4 × 5 film 35 is illuminated by adopting the above-described structure, a linear area (line area) in the main scanning direction with respect to the film 35.
The light is focused on and illuminated.

That is, one area (linear area) of the 4 × 5 film 35 is illuminated by a band-shaped light beam which is wide in the main scanning direction and narrow in the sub-scanning direction in a plane orthogonal to the optical axis.

Reference numerals 37 and 38 denote fourth and fifth optical path bending mirrors, respectively, which bend the light flux (transmitted light flux) illuminating the 4 × 5 film 35 in a predetermined direction to form a 4 × 5 imaging lens (second projection lens). ) 39. The 4 × 5 image forming lens 39 forms an image of the image information of the 4 × 5 film 35 on the surface of the CCD 17 through the sixth optical path bending mirror 42.

In the present embodiment, the first optical system is composed of the elements from the condenser means 201 to the CCD 17 through the 35 mm imaging lens 15 and the condenser means 201.
To the CCD 17 through the optical path switching mirror 12, the 4 × 5 imaging lens 39, and the like constitute a second optical system.

In the present embodiment, when reading the 4 × 5 film 35, the CCD carriage 18 is moved by the linear movement mechanism in the sub-scanning direction so that the CCD 17 is located at the position 17 'shown by the dotted line in the figure, and at this position. It holds the CCD 17.

When reading the 4 × 5 film 35, the diffusion plate 10 and the 35 mm film 11 are retracted out of the optical path as described above, and the optical path switching mirror 12 is rotated to the position 12 'indicated by the dotted line in the figure. There is.

The 4 × 5 film 35 of this embodiment has a linear movement mechanism (not shown) up to the position 35 'indicated by the dotted line in FIG.
The light flux (transmitted light) from the linear region in the main scanning direction of the 4 × 5 film 35 illuminated by the illumination light flux can be moved by the fourth and fifth optical path bending mirrors 37 and 38. An image is formed on the surface of the CCD 17 by the 4 × 5 image forming lens 39, and the image information of the 4 × 5 film 35 is sequentially read.

As described above, in the present embodiment, when illuminating a 4 × 5 film which is a large-sized original, the CCD 17 as the photoelectric conversion means scans instead of the two-dimensional illumination like the 35 mm film 11. The illumination light flux is focused only on the minimum required area, and thereby the illumination light flux from the same small light source 2 is used to perform extremely efficient illumination without requiring a large light source.

The maximum length of the illumination area is 4 × 5 film 3.
It is only necessary to assume the reading scan line length on 5, that is, the line width of the actual screen of the 4 × 5 film 35, and it is possible to reduce the maximum length of the illumination area as compared with the conventional two-dimensional illumination method. Therefore, the illumination light path length for expanding the illumination light flux from the light source 2 can be set short.

Further, as in the first optical system when reading the image information of the 35 mm film 11, the sixth optical path bending mirror is used when correcting the error (deviation) of the image forming position of the 4 × 5 film image. 42 is moved by a predetermined amount in the direction of arrow 30 (sub-scanning direction) in the figure, and the CCD 1
It is sufficient to change the standby position of No. 7. Thereby, the optical path length (imaging state) of the second optical system can be adjusted with a simple adjusting mechanism.

Next, each element constituting the scanning drive system for the CCD carriage 18 will be described.

Reference numeral 19 denotes a carriage drive motor, which is C
The CD carriage 18 is driven (moved) in the sub scanning direction. In this embodiment, a stepping motor is used as the carriage drive motor 19, and a magnet type dumbbell type flyhole 20 is attached to the motor shaft in order to suppress the vibration peculiar to the stepping motor, and a predetermined torque is generated by a magnetic force. It is connected to the motor shaft with.

Reference numeral 21 denotes a motor pulley for the timing belt, which is fixed to the motor shaft of the carriage drive motor 19. 23 and 24 are the first with a large diameter
It is a second reduction pulley having a smaller diameter than the reduction pulley, and is composed of a motor pulley for a timing belt that is integrally manufactured. A deceleration belt 22 spans between the motor pulley 21 and the first deceleration pulley 23.

FIGS. 2A and 2B are schematic views of the main parts for explaining the principle of construction of the optical system of the present embodiment, and FIG. 2A is a view of the optical system when viewed from above. Partial cross-sectional view (sub-scanning cross-sectional view) and FIG. 1B are main-part cross-sectional views (main-scanning cross-sectional views) when the optical system is viewed from the side. In the figure, the same elements as those shown in FIG. 1 are designated by the same reference numerals.

In the figure, when the optical path switching mirror 12 is rotated to the outside of the optical path shown by the solid line, the light beam emitted from the light source 2 is two-dimensionally formed on the 35 mm film 11 through the condenser means 201 such as the condenser lens 3. The image information of the illuminated 35 mm film 11 is imaged on the surface of the CCD (line sensor) 17 by the imaging lens 15 for 35 mm at substantially the same size. At this time, the aerial image of the light source 2 and the pupil of the 35 mm imaging lens 15 constitute a Koehler illumination system which is optically conjugate with each other by the condensing means 201.

Next, when the optical path switching mirror 12 is rotated to be rotated in the optical path indicated by the dotted line, the negative refraction composed of an anamorphic optical element arranged in the vicinity of the aerial image 2a of the light source 2 by the light collecting means 201. By the two cylindrical lenses 31a and 31b of force, the light beam is diverged only in one direction, that is, in the direction parallel to the paper surface (main scanning direction) shown in FIG.
The 4 × 5 film 35 is illuminated by a linear shape extending in the main scanning direction (the same direction as the arrangement direction of the CCD elements).

The image information of the illuminated 4 × 5 film 35 is imaged on the surface of the CCD 17 by the 4 × 5 imaging lens 39. At this time, the aerial image 2a of the light source 2 and the pupil of the 4 × 5 imaging lens 39 form a Koehler illumination system which is optically conjugate with the Fresnel lens 33.

In this embodiment, the optical means 31 may be composed of one cylindrical lens.

In this embodiment, since the image information of the 35 mm film 11 is projected and imaged at substantially the same magnification by the 35 mm imaging lens 15, the 35 mm films 11 and 35 mm are formed.
The distance from the image forming lens 15 is widened. Therefore, the incident angle of the light beam on the two cylindrical lenses 31a and 31b becomes small, and the negative curvature of the cylindrical lens on the light source 2 side is made small in order to widen the light beam, that is, the negative refracting power is made large to correct the aberration. Is doing well. Specifically, the two cylindrical lenses 31a and 31b are of a plano-concave type.

Next, as a specific numerical example, a numerical example in which the filament of the light source 2 can support from 3 mm square to 6 mm square will be shown. In the Koehler illumination system of the first optical system, the distance between the condenser lens 3 and the light emitting portion 26 is 26 mm, the condenser lens 3 is plano-convex and has a wall thickness of 30 mm, and the convex shape is a parabolic surface x = 0.0181955h ² + 2.73 × 10 ^-6 h ⁴ (x is the optical axis direction, h is the radial direction of the optical axis center). The distance between the condenser lens 3 and the field lens 5 is 10 mm, and the distance between them is 5-6.
A heat insulating glass 4 having a thickness of mm is arranged.

The field lens 5 has a plano-convex shape, the radius of curvature of the convex surface is 78 mm, and the distance from the apex of the convex surface to the film surface 11 of 35 mm is 33.8 mm. The projection lens 15 for 35 mm has a projection magnification of 1.32 × and a focal length of 13
Consistency is good when the F _NO is around 0 mm and the F _NO is around 5. The one-dimensional line sensor 17 having a sensor light receiving width of about 50 mm has good matching.

Next, the second large-size optical system will be described. Two plano-concave cylindrical lenses 31a and 31b are arranged at an interval of 178 mm from the apex of the field lens 5.
It is arranged at a distance of mm. Cylindrical lens 31
The concave surfaces of a and 31b have a radius of curvature of -20 mm and a focal length of about -40.8. The Fresnel lens 33 has an air space of 158 mm from the plane of the cylindrical lens 31b.
It is patterned so that the point of 196 mm on the b side and the point of 399 mm on the second projection lens 39 side can be conjugated.

In the present embodiment, a progressive focus type may be used in order to correct aberrations better.

At this time, the Fresnel lens 33 and the large original 35 are separated by about 20 mm, and the second projection lens 3
9 is a projection magnification of about 0.5 times, a focal length of about 150 mm,
Consistency is good around F _NO 5. One-dimensional line sensor 17
Can be used in common with 35 mm film reading.

In this embodiment, with the above-described structure, the shape of the illumination light beam is converted according to the size of the original to illuminate the original, and the image information of the original is read by photoelectric conversion means such as a CCD.

[0062]

As described above, according to the present invention, by appropriately setting the respective elements constituting the projection device, when the document size is the normal size, the illumination light flux shape is made into a two-dimensional square shape and illuminated. Adopting the Koehler lighting system
By adopting a Koehler illumination system that illuminates the illumination light flux into a one-dimensional linear shape for a large size, the illuminating means can be downsized even when the document size is wide and large. Lighting efficiency is increased to reduce power consumption and projection performance is maintained with high accuracy.
It is possible to achieve a projection apparatus having a light beam shape conversion unit capable of reading image information on the surface of a document with high accuracy and an image reading apparatus using the projection apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a first embodiment when a projection device having a light beam shape conversion means of the present invention is applied to an image reading device.

FIG. 2 is an explanatory diagram of an optical system according to a first embodiment of the present invention.

[Explanation of symbols]

2 Light emitting part 3 condenser lens 4 Adiabatic filter 5 field lens 11 First object 12 Optical path switching means 15 First projection lens 17 Photoelectric conversion means 31 Optical means 31a Cylindrical lens 31b Cylindrical lens 33 Fresnel lens 35 Second object 39 Second projection lens 200 light source means 201 light collecting means

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B 27 / 09,27 / 18 H04N 1/028

Claims (5)

(57) [Claims] 1. A first transmissive original is illuminated by condensing a light beam from a light emitting unit by a condensing means, and the illuminated first transmissive original is projected onto a predetermined surface by a first projection lens. In doing so, the condensing means is connected to the light emitting portion and the first
The first optical system set so that the entrance pupil of the projection lens has a substantially conjugate relationship, and the light flux from the light emitting unit is condensed by the condensing unit, and the first optical system of the first optical system is condensed by the optical path switching unit. guided to different second optical path from the optical path, illumination through the optical means having at least one optical element having a concave surface facing to the light emitting portion having anisotropy in collection and distribution properties provided in the second optical path After changing the shape of the light beam, the first transmission type original is passed through a Fresnel lens.
Illuminates a second transmissive original different from the illuminated area of the draft ,
A second optical system for projecting the illuminated second transmissive original on a predetermined surface by a second projection lens provided in the second optical path ;
A projection device provided with a power arrangement in the second optical system, the entrance pupil of the light emitting portion and the optical means is set to be substantially conjugate relationship with the condenser means, by the Fresnel lens A projection apparatus having a light beam shape conversion means, wherein an exit pupil of the optical means and an entrance pupil of the second projection lens are set to have a substantially conjugate relationship. 2. The projection apparatus having a light beam shape conversion unit according to claim 1, wherein the optical element is composed of a cylindrical lens. 3. The projection apparatus having a light beam shape conversion means according to claim 2, wherein the optical means is composed of two optical elements having the same shape. 4. The projection apparatus having a light flux shape converting means according to claim 1, wherein the light condensing means has a condenser lens, a heat insulating glass, and a field lens in order from the light emitting portion side. 5. A first transmissive document supported by a document support is illuminated with a light beam from a light emitting section through a light converging means, and image information of the illuminated first transmissive document is displayed. 1 Projection image is formed on the surface of the photoelectric conversion means by the projection lens, and the first transmission
When reading the image information of the pattern original , the first optical system in which the light condensing unit is set so that the light emitting unit and the entrance pupil of the first projection lens have a substantially conjugate relationship, and the light flux from the light emitting unit The light is condensed by the condensing means, guided by the optical path switching means to a second optical path different from the first optical path of the first optical system, and has anisotropy in converging property provided in the second optical path. After changing the illumination luminous flux shape through an optical means having at least one optical element with a concave surface facing the light emitting portion side, it is different from the illuminated area of the first object via a Fresnel lens. Second supported on original support
Transmission type original is illuminated and projected imaged by the second projection lens image information of the second transmission type manuscript <br/> provided on the second optical path which is the illumination on the photoelectric conversion unit surface, An image reading apparatus comprising: a second optical system for reading image information of the second transmissive original , wherein the power arrangement in the second optical system is such that the light emitting unit is provided by the light condensing unit. that the entrance pupil of the optical means is set to be substantially conjugate relationship was by the Fresnel lens and the entrance pupil of the exit pupil and the second projection lens of the optical means is set to be substantially conjugate relationship with An image reading device characterized by.