JPS6279439A - Image projecting device - Google Patents

Abstract

PURPOSE:To inhibit warning and recopying based upon a discrimination result and to make print density proper by discriminating whether a lighting means lights a proper area corresponding to the magnification of a projection lens or not. CONSTITUTION:When the projection lens 10 having the magnification corresponding to the image frame reduction rate of a microfilm F to be projected is mounted, a CPU 60 refers to a table with on-off signals from the contacts of a lens holder and turns on light emitting elements 36-43 at the position of a field lens 9 which has a lighting area corresponding to the power of the lens 10. An operator operates a knob according to the power of the lens 10 to move the lens 9 for the adjustment of the lighting area, but if this adjustment is forgotten or if the adjustment is made improperly, the CPU 60 turns on a warning lamp 62 and also inputs a warning signal to an AND circuit 63. Consequently, no copy signal is inputted to the CPU 60 even when a copy key 61 is depressed, so that copying operation is inhibited from being performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image projection device such as a microfilm reader printer.

(Prior art) There are various reduction ratios for photographing image frames on microfilm.
There are many projection lenses available that match each reduction ratio. Accordingly, in the microfilm reader printer, these projection lenses are detachable or switchable, and a projection lens corresponding to the reduction ratio of the microfilm can be used. At that time, the size of the image frame on the microfilm differs depending on the reduction ratio, so when replacing the projection lens, adjust the illumination area by moving the field lens of the illumination system to ensure the appropriate brightness of the projected image. It is designed to read and print projected images.

(Problems to be Solved by the Invention) However, in the case of such conventional technology, the field lens, etc. must be moved every time the projection lens is replaced or switched, which makes the operation complicated. However, there is a problem in that there are cases where the user forgets to perform an operation and is unable to obtain a print with an appropriate density.

Therefore, the present invention has been made to solve the problems of the prior art described above, and its purpose is to determine whether or not the illumination means is illuminating an appropriate area according to the magnification of the projection lens. It is an object of the present invention to provide an image projecting device that can always obtain prints with a proper degree of C by making a determination and issuing a warning or prohibiting copying.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a projection device that illuminates an information recording medium with an illumination means and projects an image of the information recording medium through a projection lens. , a detection means for detecting the magnification of the projection lens; an adjustment means for manually adjusting the illumination area of the illumination means; a detection means for detecting the illumination area of the illumination means; and a detection means for detecting the illumination area of the illumination means; It is configured to include a determining means for determining whether or not the illumination region corresponds to the magnification of the projection lens detected by the means.

(Example) The present invention will be described below based on the illustrated example. In FIG. 5, l indicates a reader printer, and this reader printer l generally forms an image frame of a microfilm F as an information recording medium selectively on a screen 2, or a photoreceptor 3. It consists of an optical device 4 for forming an image on the microfilm F, a driving device (not shown) for driving the microfilm F, and a copying device 6 for obtaining a copy of a desired image as an image recording device. .

The optical device 4 includes a film illumination light source 7, and the light rays from the film illumination light source 7 are irradiated onto the microfilm F via a condenser lens 8 and a field lens 9, and transmitted through the microfilm F. The image light is projected onto the screen 2 via the projection lens 10 and mirrors 11.12. Further, the image light of the microfilm F is also projected onto the photosensitive drum 3 of the copying device 6 via the scanning half mirror 13, I4.

The copying device 6 records an image by an electrophotographic process by operating a print button (not shown), and includes a cartridge 16 in which a developing device 15'9 surrounding the photosensitive drum 3 is integrally incorporated. We are prepared. 17
18 is a transfer charger, 19 is a copy paper cassette, 20 is a register roller, 21 and 22 are paper feed rollers, and 23 is a fixing device.

FIG. 1 is a sectional view showing the illumination means. The illumination light i
A part of the light rays emitted from Q7 directly enters the condenser lens 8, the other part is reflected by the spherical reflector 24 and enters the condenser lens 8, passes through the heat insulating filter 25, and is irradiated onto the cold mirror 26. This cold mirror 26
is an infrared transmitting type, infrared rays go straight ahead, and other rays are blocked by the cold mirror 26 at 90°.
' The light is reflected in three directions, is focused by the field lens 9, and illuminates a predetermined area of the image frame of the microfilm F. The image light transmitted through the microfilm F is projected onto the screen 2 or the surface of the photosensitive drum 3 by the projection lens 10.

The L field lens 9 is held by a holding member 27. Pins 28 and 29 are provided protruding from the side surface of this holding member 27, and the bottles 28 and 29 are fitted into elongated holes 31 recessed in the side wall of the casing 30 constituting the lighting means. , the holding member 27 is slidable up and down. Further, a rack portion 32 is provided on the other side of the holding member 27, and this rank portion 32 meshes with a gear 33. This gear 33 is connected to an external knob (not shown) via a shaft 34, and by rotating the knob, the field lens 9 can be moved up and down to adjust the area where the microfilm is illuminated. It has become. A through hole 35 is bored in the holding member 27, and a through hole 35 is formed in the casing 30.
On both side walls with the holding member 27 in between, there are light emitting elements 3 at positions a facing each other through the through hole 35 when the field lens 9 is moved in accordance with the magnification of the projection lens 10.
6 to 43 and light receiving elements 44 to 51 are arranged.

FIG. 2 is a plan view showing the state 7g in which the projection lens is attached to the main body of the reader printer. The projection lens 10 consists of a lens portion 52a and a wing portion 52b, and a wing portion 52b.
Projections 53 and 55 are provided on the side surface of the projection lens 10 at predetermined positions corresponding to the magnification of the projection lens 10. On the other hand, when the projection lens 10 is attached to the lens holder 56, the projection 53
．． Contacts 57, 58, 59 are provided which engage 55 and serve as means for detecting the magnification of the projection lens 10.

Therefore, which contact points 57, 58, and 59 are thrown 'Z L/
The magnification of the projection lens 10 is determined based on whether the projections of the 7 lenses 10 are engaged and turned off.

FIG. 3 is a block diagram showing the control system.

57, 58, 59 are the above contacts, 60 is the CPU, 61 is the copy key, 62 is the warning lamp, 63 is the AND circuit, 64
36 to 43 degrees and 44 to 51 are the light emitting elements and the light emitting elements.

Figure i4 is an external view of the apparatus showing the arrangement of the copy key 6x, the 5 warning lamp 62, and the field lens moving knob 65.

In the above configuration, the illumination means is adjusted as follows in the reader printer according to this embodiment. That is, when the projection lens 10 is replaced with a magnification corresponding to the reduction ratio of the image frame of the microfilm F to be projected, the CPU 6
0 lights up the light-emitting elements 36 to 43 at the field lens 9 position, which has an illumination area according to the magnification of the projection lens IO, by referring to the table shown in Table 1, using the ON and OFF signals from the contact 57° 58.59. let The operator operates the knob 65 according to the magnification of the projection lens 10 used to move the field lens 9 and adjust the illumination area. The light from the light emitting element reaches the light receiving element through the through hole 35, and the CPU 60 confirms that a proper illumination area has been obtained. However, if the field lens 9 is forgotten to be adjusted or is not properly adjusted, the light from the light emitting element will not reach the light receiving element, and the CPU 60 will determine that the illumination area has not been properly adjusted. At the same time, the warning lamp 62 is turned on and the warning signal "l" is sent to the AND circuit 63 via the NOT circuit 64.
Therefore, even if the copy key 61 is pressed to command a copy operation, no copy signal is input to the CPU 60, and the copy operation is prohibited. Note that only one of the warning and copy operation prohibition may be performed.

Table 1 The operator knows from the warning lamp 62 that the illumination area is not properly adjusted, and operates the knob 65 to move the field lens 9 to the proper position. By doing so, the light from the light emitting element reaches the light receiving element through the through hole 35, and the CPU 60 detects that the illumination area has been properly adjusted, turns off the warning lamp 62, and performs the copy operation. FIG. 6 is a flowchart showing the above operation.

FIG. 7 shows another embodiment of the image projection apparatus according to the present invention, in which the projection lens is not a fixed focus lens but a zoom lens. That is, the projection magnification of the zoom lens 71 held by the lens holder 70 can be changed by rotating the lever 72 left and right. A protrusion 73 is protruded from the outer periphery of the zoom lens 71, and microswitches 74, 75, and 76 are respectively disposed at positions where the protrusion 73 moves when the zoom lens 71 is rotated to achieve a predetermined magnification. ing. Therefore, when the zoom lens 71 is rotated to change the magnification, the magnification is detected depending on which microswitches 74, 75, and 76 are turned on. The other configurations and operations are the same as those in the embodiment described in JIA, so their explanation will be omitted.

In the first embodiment, a case has been described in which the magnification is detected based on the presence or absence of three protrusions on the projection lens 10, but the number of protrusions may of course be four or more.

Further, in the first embodiment, the magnification of the lens may be detected by forming a color code or bar code on the outer periphery of the projection lens 10 and optically detecting this.

Furthermore, in the embodiment described above, the case where the illumination area is adjusted by moving the field lens 9 has been described, but the invention is not limited to this. Of course, it is also possible to move the .

Further, in the above embodiment, a case has been described in which the position of the field lens, that is, the illumination area is optically detected using the light emitting element, the light receiving element, and the through hole provided in the holding member, but the invention is not limited to this. Of course, various modifications are possible, such as connecting an encoder to the shaft 34 connected to the knob 65 for moving the field lens and detecting the position of the field lens using the encoder.

(Effects of the Invention) The present invention has the above-described configuration and operation, and it is determined whether or not the illumination means is illuminating an appropriate area according to the magnification of the projection lens, based on the determination result. By issuing a warning or prohibiting copying, prints with appropriate density can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an image projection device according to the present invention, and FIG. 2 is a plan view showing a state in which a projection lens is attached.
Fig. 3 is a block diagram showing the control system, Fig. 4 is an external view of the reader printer to which the present invention is applied, Fig. 5 is a schematic diagram of the same reader printer, Fig. 6 is a flow chart showing the operation, and Fig. 7 FIG. 2 is a plan view of main parts showing another embodiment of the present invention. Explanation of symbols 7... Light source for illumination 8... Condenser lens 9... Field lens, 2' 10... Projection lens 27... Holding member 32... Rack 33.
...Ca 35...Through holes 36-43...
・Light emitting element 44-51... Light receiving element 53.55...
・Protrusion 57.58.59...Contact

Claims (1)

[Claims] An image projection apparatus that illuminates an information recording medium with an illumination means and projects an image of the information recording medium through a projection lens, further comprising a detection means for detecting a magnification of the projection lens, and a detection means that manually controls an illumination area of the illumination means. An adjustment means for adjusting, a detection means for detecting an illumination area of the illumination means, and whether or not the illumination area of the illumination means matches an illumination area corresponding to a magnification of a projection lens detected by the detection means. An image projection device characterized by comprising: a discrimination means for discriminating.