JPH038530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for changing the projection magnification of an original and photographing an original image on a photoreceptor.

In general, photographic devices such as cameras and copiers are designed to be able to change the photographing magnification (including reduction ratio) depending on the size of the document, but with this type of photographic device,
For example, a camera is mounted so that it can move up and down on a column fixed to the document table, and by moving the camera up and down electrically or manually to change its position, the optical path length between the document table and the photoreceptor can be changed. The document and the photoreceptor are held still, and the entire surface is simultaneously exposed. Generally, in such photographic devices, the photographable range corresponding to the photographic magnification is displayed, and the illumination lamp that illuminates the document placed on the document table is positioned to optimally illuminate the maximum photographable size of the document. Fixed. Therefore, for example, when photographing a small document, the camera position is lowered, so even though the height is lower, the illumination light position does not change, so the entire device still requires a large amount of wasted space, and moreover, when working There are drawbacks that make me uncomfortable. Also, since the illumination lamp illuminates a certain area regardless of the shooting magnification, when photographing small documents, the illumination lamp is illuminating unnecessary areas and the light rays of the illumination lamp are not used effectively. There is.

In order to eliminate the above-mentioned inconvenience,
Publication No. 60921 discloses providing an interlocking mechanism that moves the illumination means to an appropriate illumination position in conjunction with the vertical movement of the camera.

When the position of the illumination means is changed according to the magnification in this way, the operator cannot see with the naked eye the area that is properly illuminated, so the document is placed in an inappropriate position and photographed. Improper conditions may occur if the film cannot be properly photographed, parts of the original are missing, or the illumination light is not used effectively, or if the interlocking mechanism malfunctions and you are not aware of this. This had the disadvantage of causing mistakes when photographing originals that were illuminated by the camera.

SUMMARY OF THE INVENTION An object of the present invention is to provide a photographing device that eliminates the above-mentioned drawbacks.

The present invention will be explained below based on the drawings. 1st
The figure shows a flat-bed microfilm photographing device to which the present invention is applied. A document placed on a document mounting table 1 is illuminated uniformly by illumination lights 2 installed on both sides of the table, and is photographed by a camera 3. be done. The camera 3 is equipped with a photographic lens 4, and has a film feed mechanism, a winding mechanism, a shutter mechanism, etc., which are not shown in the drawings, and which are included in a typical camera. 5 is an arm that supports the illumination lamp 2 made of a fluorescent lamp and the reflector 6; 5 ₁ is a cylindrical fixed arm that holds the arm 5 in a predetermined position; 7 is a power switch for the entire device; 8 is a film feed and search unit. This is a control switch that issues commands such as imprinting marks and frame numbers. Reference numeral 9 denotes a cylindrical fixed column that fixedly supports the fixed arm ₅₁ , and a movable column 10 that fixedly supports the camera is installed inside the column so as to be movable in the vertical direction. 11 is a handle for moving the column 10 up and down, and 12 is a knob thereof. Second
The figure shows a mechanism for moving the movable column 10 up and down. When the handle 11 is rotated by holding the knob 12 in the hand, the worm gear 14 is rotated by the worm 13 directly connected to the handle, and at the same time, the pinion 15 directly connected to the worm gear is rotated. Rotate. These are unitized and fixed to a fixed support 9. Also, a rack 16 is attached to the movable column 10 and engages with a pinion 15. Therefore, when the handle 11 is rotated, the column 10 moves up and down along the fixed column 9, and the camera 3 moves integrally with the column 10. The combination of the worm 13 and the worm gear 14 is designed to stop at the point where the handle stops rotating, no matter where the support 10 is located.
In other words, the handle is designed not to rotate due to the load from the rack 16. As shown in FIG. 6, a plate 10' on which markings A, B, and C indicating photographic reduction ratios are printed is attached to the movable column 10.
The number in display A means that the original is photographed at a reduction ratio of 1/24, the number in display B means that the document is photographed at a reduction ratio of 1/34, and the number in display C means that the original is photographed at a reduction ratio of 1/48. Each display A, B, C
The colors and patterns of the numbers are different from each other.
The interval l between these display sections is determined by the focal length of the photographing lens. When the column 10 is moved by rotation of the handle, the plate 10' moves along the window 9' provided in the fixed column. When the display portion of the selected plate is placed in the window 9', the image will be photographed at a reduction ratio corresponding to the display number placed in this window. Although not shown, the distance between the photographic lens and the film surface is automatically adjusted because the distance between the document and the lens changes as the camera moves up and down.

On the other hand, the document table 1 is provided with indicators A', B', and C' that indicate the photographable range commensurate with the photographic reduction ratio. Each indicator has an L-shape, and indicator A' is in display area A.
indicates the photographing area (corresponding to A4 size) that can be photographed by the camera when it is positioned at window 9', and is attached to the corner of this photographing area and is the same as the corresponding display section A. The indicator B' indicates the photographing area (corresponding to the size of A3 size) that can be photographed by the camera 3 when the display part B is positioned at the window 9', and the corner of this photographing area It has the same color and pattern as the corresponding display part B. Index C' is C is window 9'
It shows the photographing area (corresponding to the size of A2 size) that can be photographed by the camera 3 when the camera is located at .

Further, as shown in FIG. 3, the arm 5 is slidably held on the fixed arm ₅₁ , and the handle 11
The fixed arm 51 moves in the direction of the arrow along the cylinder of the fixed arm ₅₁ in conjunction with the column 10 which moves up and down as the arm rotates.
It is configured to change the position of the illumination light 2. This illumination lamp is placed at a position where the specular reflection of the illumination lamp reflected from the document placement surface does not enter the photographic lens L. For example, in Figure 1, the original size is
If it falls within the A' frame, in order to prevent the specularly reflected light from the illumination lamp 2 from entering the photographic lens L, place the illumination lamp outside the area Wa as shown in Figure 3. (At this time, the camera is placed at the solid line position.) In other words, when the light ray a' connecting the photographing lens L and the photographable range A' is taken as the incident light ray, the illumination lamp 2 may be placed at a position outside the specularly reflected light ray a. Furthermore, when the camera moves to the broken line position 3', it is necessary to place the illumination light outside line C. Figure 4 shows a mechanism for automatically positioning the illumination light in accordance with the photographic magnification.
This will be explained with reference to FIG.

In FIGS. 4 and 5, 20 is a rack fixed to the support column 10, and 21 is a pinion having a wire pulley 22 at one end, which meshes with the crack 20. 23 is the shaft of the pinion, and the fixed arm 5 ₁
is supported at both ends. 24 is a wire, one end of which is fixed to the wire pulley, and the other end of which is connected to the end surface of the slidable arm 5. 2
Reference numeral 5 denotes a coil spring, which acts to constantly press the movable arm 5 outward against the fixed arm ₅₁ . 27 and 28 are spacers for positioning the pinion and wire pulley. 4th and 5th
The figure shows the camera in its lowest position, that is, the solid line position in Figure 3. For example, the handle 11 is rotated to move the camera from this position to the maximum shooting range position (the dashed line position in Figure 3). Then, the movable column 10 moves in the direction of arrow a in FIG. At the same time, the wire 24 wound around the wire pulley is relaxed. As a result, the movable arm 5 is pushed outward by the length of the relaxed wire due to the action of the coil spring 25, and slides in the direction of arrow b.
That is, in FIG. 3, the lighting lamp can be placed at the position Wc. The length of the relaxed wire is determined by the number of teeth of the pinion 21 and the outer diameter of the wire pulley.

Returning to Fig. 1, the movable arm 5 has indicators A″, B″,
The indicators A'', B'', and C'' indicate the appropriate position of the illumination light corresponding to the imaging magnification, and the indicators A', B', and C'' indicate the photographable range at the corresponding magnification.
It is set to the same color or pattern as C′.
In other words, the indicators A'' and A', B'' and B', and C'' and C' correspond to each other and have the same color or pattern, and the color or pattern of the indicators differs depending on the magnification. Indicators A″, B″, and C″ are used to confirm that the illumination light is positioned at the position corresponding to the imaging magnification.For example, if the sliding surfaces of the fixed arm and movable arm become stuck due to an accident, Alternatively, the purpose is to prevent photographing errors due to improper positioning of the illumination light due to the illumination light not being reliably pressed outward even though the wire is loosened due to the coil spring becoming sagging or the like.

In the above device, for example, the size of the original
In the case of A4 size, place the document S in a position surrounded by the index A' as shown in Figure 6, and
The camera 3 is moved up and down by turning the handle 11 so that the display part of the same color (or pattern) as that of A' is located in the window 9'. When a photograph is taken with the display section A displayed on the window 9', the image of the document is recorded on the film in the camera at a reduction ratio of 1/24. At this time, the movable arm 5 automatically moves and stops when the index A'' matches the tip of the fixed arm _51. Therefore, as shown in Fig. 3, this imaging device has the smallest form, and the illumination The light from the illumination lamp is effectively used without illuminating an unnecessarily wide area.Similarly, when photographing an A3-sized document, position the document according to index B', and make sure that display area B is The camera is moved to the position where the photographing magnification is shown in the window 9' and the photograph is taken at a reduction ratio of 1/34.At this time, the arm 5 automatically moves and the index
B'' stops when it meets the tip of the fixed arm ₅₁ , and within this possible shooting range, the entire shooting device becomes the smallest and the light from the illumination lamp is used effectively.Also, it is possible to shoot an A2 size document. In this case, position the document according to the index C' and move the camera to a position where the display section C is displayed on the window 9', and the illumination light will automatically move to the position Wc in FIG. 3. Therefore, by photographing at a reduction ratio of 1/48, originals of each size are recorded on the film at the same size.

Note that the present invention also includes the case of enlarging and photographing (copying). In the above embodiment, the photographing magnification is changed by changing the optical path length between the photoreceptor surface and the document placement surface, but the photographing magnification can be changed by replacing lenses with different focal lengths or using a zoom lens. This method can also be applied to the present invention. The present invention can also be applied to cameras and copying machines.

As described above, according to the present invention, since the position of the illumination source is automatically changed in accordance with the photographing magnification, the form of the photographing device can be made the smallest size commensurate with the size of the original, and the Since only the document placement area corresponding to the magnification is illuminated by the illumination source, the light from the illumination source is used effectively and without waste.
As a result, when the shooting magnification is low, the amount of light from the illumination source can be reduced compared to when the magnification is high, so power can be saved; conversely, when the amount of light emitted from the illumination source is constant, Since the exposure time can be shortened when the magnification is low, the photographing time can be shortened and work efficiency can be increased. In addition, the index indicating the photographable area and the index indicating the suitable position of the illumination means are the same color or pattern as the display of the corresponding photographing magnification, and the color or pattern is different for each magnification, so that the document can be placed properly. There is no risk of mistaking the position, and the illumination light can always be used effectively for photography.Furthermore, if the illumination means is not placed in the appropriate position due to a failure in the interlocking mechanism, the set photographic magnification can be adjusted. By comparing the color or pattern of each index with the display, it can be easily known that the illumination means is in an inappropriate position, and it is possible to prevent the mistake of photographing without correctly illuminating the document.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a photographing device showing an embodiment of the present invention, Fig. 2 is a sectional view showing a mechanism for moving the camera up and down, and Fig. 3 is a diagram illustrating the positional relationship between the photographable range and the illumination light. , Figures 4 and 5 are cross-sectional views showing a mechanism in which the position of the illumination light changes in conjunction with the photographing magnification, and Figure 6 is a diagram illustrating the relationship between the display of the photographing magnification and the index of the photographable range. be. 1... Original table, 2... Lighting light, 3... Camera, 10... Movable column, 11... Handle, 20
...Ratsuk, 21...Pinion.

Claims (1)

[Claims] 1. Illumination means for illuminating the original placed on the original placing surface, moving means for moving the illumination means to change the illumination area of the original placing surface, and adjusting the distance of the photographing device from the original placing surface. In the photographing apparatus, the photographing apparatus includes a magnification changing means for changing the photographing magnification according to the magnification changing means, and a driving means for driving the moving means according to the magnification changing means, a display means for displaying the photographing magnification;
an indicator on the document placement surface that indicates a photographable range corresponding to the photographing magnification, and an indicator on a member that moves integrally with the illuminating means to indicate the appropriate position of the illuminating means corresponding to the photographing magnification. and an indicator indicating the
A photographing device characterized in that an index indicating a photographable range and an index indicating a proper position are set in the same color or pattern as the display of the corresponding photographing magnification, and are set to a different color or pattern for each magnification.