JP2573062B2 - Transparency document projector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent original projecting apparatus that projects an image of a transparent original such as a slide film or an OHP sheet onto an original placing portion of an original reading apparatus.

(Prior Art) In recent years, as multi-functions of a document reading apparatus and a copying apparatus have progressed, apparatuses capable of reading a transparent document such as a slide film or a 35 mm negative film in addition to a placed document have begun to spread.

 FIG. 14 shows such an apparatus.

In the figure, A is a document reading device, B is a projector, and C is a mirror unit. The projector B and the mirror unit C are detachable from the document reading device A, respectively.

Reference numeral 1 denotes a transparent original film such as a slide film or a 35 mm negative film, and 2 denotes an illumination lamp. The light emitted from the illumination lamp 2 illuminates the original film 1 through the condenser lens 3, and the transmitted light 5 is transmitted to the projection lens 4.
Then, the light is emitted toward the mirror unit C.

Thereafter, the light 5 directed to the original glass 8 by the reflection mirror 6 of the mirror unit C reaches the Fresnel lens 7 and is placed on the original glass 8 of the original reading device A.
Is formed. The light image is moved and scanned by the reflection mirrors 9 and 10 in the original reading apparatus A to the positions indicated by broken lines 9 'and 10' in the drawing.
Imaged on D12 and read.

The Fresnel lens 7 is supported by a Fresnel support plate 71. The reflection mirror 6 is supported by a mirror support member 61 and is rotatable about a shaft 72 with respect to a Fresnel support plate 71.

When a transparent original is not read, that is, when the mirror unit C
When the mirror support member 61 is not used, the mirror support member 61 is
And the positioning pin P for positioning the Fresnel support plate 71 is disengaged, and the mirror unit C is detached from the document reading device A.

After detaching the mirror unit C, the original reading device A
Reads a reflection original such as a document or a drawing placed on the original glass 8.

(Problems to be Solved by the Invention) Incidentally, in recent years, films for improving color reproducibility of 35 mm negative films and the like have begun to be manufactured by film manufacturers.

In the case of this type of film, the base density of the film itself is higher than that of a conventional film, and light is difficult to transmit. Therefore, when illuminating and projecting in the same way as before,
The amount of light of the light image on the original placing portion of the original reading device decreases, and it becomes impossible to read the original properly. For this reason, the lighting voltage of the illumination lamp is controlled by the control unit so as to keep the light amount on the document placing unit constant. However, when the base density is high, the control range may be exceeded.

Therefore, there is a method of increasing the light amount of the illumination lamp in order to increase the light amount of the light image on the document placing portion. However,
In this method, the power supply capacity for lighting the lamp must be increased, and the power supply becomes large and the cost increases. In addition, the life of the lamp will be shortened, and the temperature around the lamp and the film surface will also increase, causing damage to the film.Therefore, it is necessary to strengthen cooling measures such as adding a cooling fan. No.

According to the present invention, the illuminance of a light image can be changed by changing a projection area of a light shadow projected on a document placing portion of a document reading device. I made it possible. Specifically, the light amount is reduced by increasing the projection area, and the light amount is increased by decreasing the projection area.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an illuminating unit for illuminating a transmissive original, and projecting a light image transmitted through the transmissive original onto an original mounting portion of an original reading device. Projection means for;
In a transparent original projecting device having transparent original supporting means for supporting the transparent original, a projection area of a light image projected on an original placing portion of the original reading device is made variable.

(Operation) According to the present invention based on the above configuration, the transmissive original is illuminated by the illuminating means, and the transmitted light is projected onto the original placing portion by the projecting means. The projection area of the projection light is variable.

(Example) First, the use state of FIG. 1 will be described.

The mounting table B1 of the projector B incorporates a power supply unit and a control unit of the projector B, and is fixed to the document reading device A. The projector B is fixed to the projection table B2, and is mounted on the table B1 by its own weight via the projection roller 101 provided on the projection table B2,
Further, it is rotatably connected to the mounting table B1 by a projection connection shaft 102 which is a rotation center. The connecting member 14 rotatably connects the projector B and the mirror unit C by a rotation axis B3 on the projector B side and a rotation axis C1 on the mirror unit frame 103 side constituting the mirror unit C as a deflecting means. .

The mirror support member 61 that supports the reflection mirror 6 is coupled to the mirror unit frame 103 so as to be rotatable about a rotation axis 104. The rotating shaft 104 is hollow, and two torsion springs 105 and 105 'are incorporated therein. When the mirror supporting plate 61 rotates against the own weight of the mirror 6 and the mirror supporting plate 61, respectively. It acts so that a moment of lifting upwards around the 104 always acts. One of the mirror links 106 is rotatably supported by a pin 107 on the side opposite to the rotation shaft 104 of the mirror support plate 61, and the other is slidably engaged with the elongated hole 108 of the mirror unit frame 103, and the projection light beam is The angle is maintained at an angle deflected by the mirror 6 so that the light is incident on the glass 8 at a substantially right angle.

A Fresnel lens 7 for deflecting the projection light beam deflected by the mirror 6 so as to form an image on the CCD 12 is located above the original glass 8 and supported by a Fresnel support plate 71. The Fresnel support plate 71 is coaxially supported by the rotation shaft 104 and the mirror support plate 61, and is rotatable about the rotation shaft 104. An original pressing plate 13 as a transparent original supporting means is arranged between the Fresnel lens 7 and the original glass 8 so as to be in contact with the original glass 8. The document pressing plate 13 is a transparent plate member made of, for example, acrylic, and is loosely supported by a Fresnel supporting plate 71. A spring 110 is built in the Fresnel support plate 71, and the Fresnel support plate 71 acts in reverse to the moment due to gravity around the rotation axis 104, and the Fresnel support plate 71
When the handle 111 provided at the tip of 71 is lifted, the lifting operation can be performed smoothly.

One end of a slider 113 is slidably engaged with the tip of the mirror support plate 61 in the direction of the arrow in the figure, and pushes the mirror support plate 61 downward against the force of the torsion springs 105 and 105 ′, and the mirror unit frame 103 And mirror support plate 61
When the slider 113 slides, the other side of the slider 113 engages with the projection 114 of the mirror unit frame 103. Thereby, as shown in FIG. 3, the mirror support plate 61 is stored.

Further, a part of the slider 113 is configured to be a handle for lifting the mirror unit C. A roller 17 having an appropriate frictional force with respect to the original glass 8 is rotatably attached to an end of the mirror unit frame 103 on the original placing portion side via a shaft 115 fixed to the mirror unit frame 103. .

With the mirror support plate 61 shown in FIG. 3 housed,
By lifting the mirror unit C by the gripping portion of the slider 113, the roller 17 rolls on the original glass 8, and the rotating units B3 and C1 on which the connecting member 14 is supported are rotated while the mirror unit C Folded to the position where it comes into contact with the stopper B4.

Rotation axis B3 on which connecting member 14 is axially supported on projection table B2 side
Has a built-in spring 116, and causes a moment to rotate the connecting member 14 clockwise so as to be able to rotate while balancing the gravity of the mirror unit C with the gravity of the mirror unit C in accordance with the rotation of the connecting member 14. The unit C can be stored and placed on the document glass 8 smoothly. Further, since the roller 17 rotates and rolls on the original glass 8 without slipping, even if the mirror unit C is repeatedly moved, the original glass 8 becomes dirty.
Does not cause scratches.

Further, as shown in FIG. 4, the projection table B2 has a tapered shape immediately before the mirror unit C collides with the stopper B4 of the projector B, and the mirror unit C projects when the mirror unit C collides with the stopper B4. The roller 17 is securely climbed on the table B2, and is stored in a state where the roller 17 is completely raised from the table B1. Therefore, at this time, the mirror unit C
When the projection table B2 rotates about the projection coupling axis 102, the projector B and the mirror unit C can rotate integrally.

As shown in FIG. 6, the mirror unit C is retracted backward by rotating the projection table B2 by 90 ° together with the mirror unit C with respect to the stored state of the mirror unit C.
The projector B also comes to a position displaced in the front-back direction. Therefore, a space is created in the vicinity of the document glass 8 of the placing table B1, so that a document having a size larger than the glass on the document glass 8 can be read in the reflection document mode without any trouble. In this embodiment, a rotation angle of 90 ° will be described. However, the rotation angle need not be limited to 90 ° depending on the position of the projection coupling shaft 102 and the sizes of the projector B and the mirror unit C.

Next, a method of displacing the mirror unit C will be described with reference to FIG. Fig. 12 shows the mirror unit C and connecting members
14 is a detailed perspective view of a portion that engages with FIG. On the side surface of the mirror unit frame 103 is provided an engagement hole 201 with which the rotation axis C1 of the connecting member 14 is engaged. On both sides of the engagement hole 201, the portions 201 'and 20
The rotation shaft C1 is engaged with each of the round portions. At this time, since the rotation shaft C1 of the connecting member 14 is always lifted upward by the spring 116, the rotation shaft C1 is once engaged with the round portion. There is no displacement when engaged.

When the mirror unit C is displaced, the arrow 202,
Move in the direction of 202 '. For example, when the optical path length is to be shortened, it is moved in the direction of the solid arrow 202 in the drawing, and when it is desired to increase the optical path length, it is moved in the direction of the broken arrow 202 'in the drawing. Here, the case where two positioning round portions are provided has been described. However, by increasing the round portions as necessary, it is possible to select a positioning position in several places.

Therefore, since the light quantity is inversely proportional to the square of the projected area, the shorter the optical path length, the smaller the projected area and the greater the light quantity. At times, the light amount on the original glass 8 can always be kept constant by increasing the optical path length.

Next, regarding the lock mechanism at the time of the rotation operation of the projector B,
This will be described with reference to FIGS. 4 and 5. The mounting table B1 has a recess 121 on the line connecting the projection coupling axis 102 and the original glass 8, and 9 and 9
A recess 121 ′ is provided in the 0 ° direction.

The positioning shaft 122 provided on the projector B is supported so as to be vertically slidable with respect to the positioning support plate 123. A compression spring 124 is provided around the positioning shaft 122, and one of the compression springs 124 contacts the stopper 125 on the positioning shaft 122, and the other contacts the positioning support plate 123, thereby pushing the positioning shaft 122 downward. The positioning shaft 122 is connected to a positioning lever 127 via a link mechanism 126. When the lever 127 is swung, the positioning shaft 122 is pushed upward. Here, the distances from the projection coupling axis 102 to the recesses 121 and 121 'on the table B1 and the distance from the projection coupling axis 102 to the positioning axis 122 are equal.

When the projector B is rotated around the projection coupling axis 102, the positioning shaft 122 is always pushed down by the compression spring 124, so that when the positioning shaft 122 is positioned in the concave portion on the mounting table B1, it is automatically fitted into the concave portion. And lock. As a result, the positions when the transparent original is read and when the transparent original is stored are determined. Next, the lever 127 is swung so that the positioning shaft 122 is recessed.
When the projector B is lifted from 121 and rotated, the lock is released. Once the lock is released, there is no need to swing the lever 127, and the positioning shaft 122 rotates while sliding on the mounting table B1, and when it reaches another recess, it is fitted and locked again in the recess. Switching between the reading position and the storing position is performed by repeating this operation.

On the lower surface of the projection table B2, there is provided a projection 128 for a stopper in a rotating direction in a direction opposite to the positioning axis 122 and the projection coupling axis 102. The mounting table B1 also has the recess 1 described above.
21 and 121 'and the projection 12 in the direction opposite to the projection coupling axis 102.
9,129 'are provided. When the projector B is rotated and the locking means does not function and the overrun occurs,
The projections 128 on the lower surface of the projection table B2 and the projections 129, 129 'on the table B1 abut each other, so that the angle of the rotation operation is limited, and an operation error such as overrun can be prevented beforehand.

Next, the projection lens 4 will be described with reference to FIG.
The projection lens is fitted and supported by a lead screw on a lens support member 203 fixed to the frame of the projector B. Therefore, if the projection lens 4 is rotated, it can be displaced in the left-right direction in the figure, that is, in the transmission direction. Further, a gripper 204 is provided at the tip of the projection lens 4 and can be manually rotated by grasping it.

Further, a lens gear 205 is integrally provided on the outer periphery of the projection lens 4. The lens drive motor 206 fixed to the frame of the projector B is provided with a gear 207, which meshes with the lens gear 205 via an idler gear 208. The lens drive motor 206 is a pulse motor,
The projection lens 4 is moved by a required amount by rotating a necessary number of pulses in response to a signal from a control unit incorporated in the unit 1. Therefore, even if the optical path length changes according to the displacement of the mirror unit C, the projection lens 4 is moved by the lens drive motor 20.
By giving the necessary number of pulses to 6, it becomes possible to properly focus the optical image on the original glass 8.

Reference numeral 209 denotes a home position detection switch for the projection lens 4, which serves as a start reference for driving the projection lens 4 by the pulse motor 206. Therefore, when moving the projection lens 4, first, the lens gear 205 of the projection lens 4 is moved to the home position detection switch 2.
When 09 is turned on and the pulse motor 206 rotates by the number of pulses controlled by the control unit from that point on, the projection lens 4 can move.

FIG. 8 is a perspective view of the film carrier 131 in FIG.

In the case of projecting a 35 mm film, a slide film, or the like with the transparent original projecting apparatus of the present embodiment, first, as shown in FIG. 8, a transparent original as a transparent original is placed between the two plates 131A and 131B of the film carrier 131. The original film 1 is sandwiched. Next, as shown in FIG.
Into the carrier hole 132 of the magazine M attached to the
A desired frame is arranged on the optical axis. Thereafter, by performing a predetermined input from the operation panel A1 of the document reading device A,
A document reading operation similar to that described in the conventional example is performed.

Further, in the present embodiment, the Fresnel lens 7 is not brought into close contact with the original glass 8 and is arranged above while keeping a space. The reason is that the Fresnel lens 7 is an optical image having concentric or parallel linear fine grooves on its surface. When the Fresnel lens 7 is brought into close contact with the original glass 8, the fine grooves disturb the read image and adversely affect the image. Effect. As a method for preventing this, it is conceivable to make one surface of the Fresnel lens 7 a diffusion surface in a mat shape on the whole, but this causes a decrease in the amount of transmitted light.

Therefore, the Fresnel lens 7 is supported above the original glass 8, and the groove of the Fresnel lens 7 is the lens of the original reading device A.
It was arranged to be located outside the focal range of 11.

In this embodiment, in addition to a 35 mm film or a small slide film as a transparent original, a large format film such as 8 inches × 10 inches or 4 inches × 5 inches, or
OHP film can be read by transmitting illumination.

FIG. 9 is a plan view for explaining the case where the relatively large film is transmitted and illuminated. In the figure, the original glass 8
The document placement reference 81 provided for the document is a reference for placing a document when reading a normal reflection document (document, drawing, etc.).

When reading the original film 25 by the original reading device A, first, the original original reference
The document film 25 is then positioned with respect to the placement reference 261 of the transparent document reference sheet 26. As the transparent original reference sheet 26, for example, a sheet or the like that indicates the placement reference 261 by a transparent portion or a pit portion 262 and a colored portion or an opaque portion 263 in an area corresponding to the standard size shown in FIG. 7A can be used. . Also, as shown in FIG. 7 (b), the colored sheet or opaque plate 26 '
264 may be printed, a commonly used size may be printed thickly 265, and a sheet may be used that allows the user to cut into squares according to the size used. As a result, the area other than the transparent document becomes a non-transmissive area for each size, so that the document reading device A can automatically recognize the size of the transparent document.

FIG. 10 is a cross-sectional view of the vicinity of the document pressing plate 13. FIG. 10 (a) shows the case where the original film 25 is not provided, and FIG. 8 (b) shows the case where the original film 25 is placed on the transparent original reference sheet 26. The document pressing plate 13 is supported with a play 134 on the Fresnel supporting plate 71. For this reason, in the case of FIG. 8 (a), the original pressing plate 13 is placed in close contact with the original glass 8, but in the case of FIG. 8 (b), the thickness of the original film 25 is reduced by the original pressing plate. The original film 25 is absorbed by the play 134 of the plate 13 and the original film 25 is pressed against the original glass 8 by the original weight of the original pressing plate 13. As described above, by using the document pressing plate 13, the document film 25 is placed on the document glass 8 in close contact with the document film 25 without causing a placement failure such as slackness or waving.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 11 shows a mirror unit C according to another embodiment of the present invention.
FIG. 4 is a side sectional view showing the positioning means of FIG. On the upper surface of the document reading device A, at least two
More than one positioning fitting holes H ₁ , H ₂ … are open.
Also, the Fresnel support plate 71 is fixed positioning dowel pin P, the desired optical path length by fitting the pins to the required positions H _n of the fitting hole in accordance with the required position of the mirror unit C , The required light amount on the original glass 8 can be secured.

In this embodiment, fitting pins P are provided on the Fresnel supporting plate 71 and fitting holes H ₁ , H ₂ ... Are provided on the document reading apparatus A side. The object of the present invention can be achieved even if a fitting pin is formed on the mating hole or the document reading device A side.

Still another embodiment will be described with reference to FIGS. 13 (a) and 13 (b).

FIGS. 13 (a) and 13 (b) are optical arrangement diagrams of a transparent original projecting device according to the present invention for explaining another embodiment. In the figure, reference numeral 45 denotes a projection lens, which is a zoom lens.
FIG. 13 (a) shows an arrangement for projecting a film having a normal base density. FIG. 2B shows an arrangement for projecting a film having a high base density. According to this, the distance between the film 1 and the original glass 8 is always kept constant.
Changing the focal length of the zoom lens 4, reduced the L only displacing the position of FIG. 13 of the projection lens itself (a), as (b), the projection area on the document glass 8 from S ₁ to S ₂ Will be. In this case, since the illuminance is inversely proportional to the square of the area, the light amount increases by the reduced amount. Therefore, by displacing the zoom lens, the projection area is reduced in the case of a film having a high base density, and conversely, the projection area is increased in the case of a low base density, so that the light amount on the original glass 8 is always kept constant. It becomes possible.

(Effects of the Invention) As described above, by changing the projection area projected from the projection unit onto the original placing portion of the original reading device, the light amount of the structure on the original placing portion is always kept constant. This makes it possible to always read a clear original even with films of any base density.

Further, the power supply capacity for lighting the illumination lamp can be reduced, and the cost can be reduced. Further, the life of the lamp is prolonged, and it is effective for raising the temperature.

[Brief description of the drawings]

1 to 3 are perspective views showing a transparent original projecting apparatus of the present invention, FIG. 4 is a sectional view thereof, FIG. 5 is a plan view showing a lock mechanism, FIG. 6 is a perspective view showing a stored state, FIG. 7 is a perspective view showing a reference sheet of a large transparent original, FIG. 8 is a perspective view of a film carrier, FIG. 9 is a plan view of a large transparent original set on an original glass, and FIG. , (B) is a cross-sectional view showing a document pressing plate, FIG. 11 is a cross-sectional view of the transparent document projecting device of the present invention, FIG. 12 is a perspective view of a portion connecting a mirror unit and a connecting member, and FIG. 14A and 14B are optical arrangement diagrams showing another embodiment, and FIG. 14 is a cross-sectional view showing a conventional transmissive original projecting device. EXPLANATION OF SYMBOLS 8 Document glass (document mounting portion) 13 Document holding plate (transparent document supporting means) 14 Connecting member 25 Document film (transparent document) 206 Lens driving motor (driving means) A: Document reading device B: Projector (illuminating means) C: Mirror unit (deflecting means)

Claims (6)

(57) [Claims] An illuminating means for illuminating the transparent original; a projecting means for projecting a light image transmitted through the transparent original onto an original mounting portion of an original reading device; and a supporting means for supporting the transparent original. A transparent original projecting device having transparent original supporting means, wherein a projection area of a light image projected on an original placing portion of the original reading device is made variable. 2. The apparatus according to claim 1, further comprising: a deflecting means for deflecting the light projected from said projecting means, between said projecting means and a document placing portion of said document reading apparatus. Transparent document projector. 3. The apparatus according to claim 1, wherein said projection means is a zoom lens. 4. The apparatus according to claim 2, wherein said projecting means and said deflecting means are variable in position with respect to the direction of transmission of the light image. 5. The apparatus according to claim 4, wherein said deflecting means and said illuminating means are integrally connected via a connecting member. 6. The transparent original projecting apparatus according to claim 3, further comprising a driving unit for displacing said projecting unit.