JPH01214833A - Microfilm reader - Google Patents

Abstract

PURPOSE:To facilitate operation for inputting a masking range by shielding the masking range with a crystalline shutter plate placed in a projection path and displaying on a screen ranges other than the masking range. CONSTITUTION:The whole projected image on a film 18 is projected onto the screen 28 with the whole surface of the shutter plate 50 being translucent. In this condition, the masking range is input by a touch sensor 48. Coordinates for the masking range are read by a CPU 34; the CPU 34 discriminates the masking range according to a prestored control program. The given coordinates of the masking range is stored in a memory 42. The CPU 34 opaques the corresponding range of the shutter plate 50 based on the coordinates of the masking range to shields the range. Consequently the projected light for the masking range is shielded by the shutter plate 50 and only required range A other than that appears on the screen 28. When a line sensor 30 is moved, in this condition, in the direction of sub-scanning to read the image, the image in the only required range A is read. The CPU 34 stores in the memory 42 the output of the sensor 30.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microfilm reader equipped with a masking device that displays a masking range on a screen.

(Technical background of the invention) The transmitted light of the microfilm is guided to a transmission screen,
A microfilm reader that forms an enlarged projected image is widely known. There are conventional masking devices that leave only the necessary areas and exclude other areas from the image projected on the screen. There was a problem in that the plate moving mechanism became complicated. It is also possible to enter the coordinates of the mask range using input keys on the operation panel, but in this case, there is a problem that it is difficult to confirm the correspondence between the coordinate position and the position of the image on the screen, making it difficult to use. Ta. Furthermore, if it is necessary to mask not only the periphery of the image but also a part of the image at the same time, this method of masking is not possible with a device that mechanically moves the shield, and the key A problem arises in that the operation becomes very complicated when coordinates are inputted.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and has a very simple mechanical configuration as there are no mechanically moving parts, and the input operation of the mask range is also very simple, making it easy to change the range. The purpose of the present invention is to provide a microfilm reader that can be used to confirm information and easily set multiple mask ranges.

(Structure of the Invention) According to the present invention, this object is to provide a microfilm reader for forming an enlarged projected image of a microfilm onto a transmission screen, and to provide a microfilm reader which is arranged in front of the screen and inputs a mask area. and a liquid crystal shutter plate disposed in the optical path of the projection light reaching the screen, the mask device is characterized in that the mask device blocks light from an area other than the set mask range by the liquid crystal shutter. This is achieved by using a microfilm reader.

(Embodiment) FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is an enlarged view of its optical system, and FIG. 3 is a block diagram showing functions.

In these figures, reference numeral 10 is a light source, and this light source 1
0 light is protected by condenser lens 12! Glass 14, cold mirror 16, microfilm 18, projection lens 2
0, the image is guided to a transmission screen 28 via an image reversing prism 22 and mirrors 24 and 26, and this screen 28
An enlarged image of the microfilm 18 is formed.

On the back side of the screen 28 is a line sensor C, which is an example of a line sensor.
A CD line sensor 30 is arranged to be movable left and right. That is, the line sensor 30 is disposed long in the direction that vertically traverses the screen 28, and the line sensor 30 performs main scanning by reading out images in the length direction and sequentially outputting the image signal α as a time-series signal. Further, the line sensor 30, which performs sub-scanning by moving the line sensor 28 in the left-right direction, may be movable up and down with respect to the screen 28. This line sensor 30
The image signal α is sent to CP via the input interface 32.
The image signal is input to U34, where various processing is performed and the image signal is binarized. This binarized image signal β is outputted to the printer 38 via the output interface 36, where the image is printed out and a hard copy is obtained. Also, the binary signal β outputted by the CPU 34
can be recorded on an external storage device such as the optical disk device 40.

Therefore, if necessary, a necessary original image may be read out from the optical disk device 40 and printed out by the printer 38. Note that 42 is a memory of the CPU 34.

As shown in FIG. 1, the microfilm 18 is placed horizontally on a film stand 46 provided in an apparatus case 44, and light passes through the film 18 vertically upward. The light transmitted through this film 18 is reversed at a prism 22 and enters a mirror 24 from below. The emitted light reflected by this mirror 24 is transmitted to a mirror 26, that is, a screen 28.
The light enters the final mirror 26 in front of the mirror 26 almost horizontally, where it is reflected and guided to the screen 28 .

A translucent touch sensor 48 is disposed in front of the screen 28, and the mask range can be input using this touch sensor 48 while viewing the image on the screen 28. The touch sensor 48 may have a structure in which, for example, a transparent electrode is deposited on the surface of the screen, and input coordinates are detected by applying a voltage to this electrode using a pen-shaped touch electrode. It is also possible to have a structure in which capacitance is monitored using a vapor-deposited transparent electrode and input coordinates are detected from changes in capacitance caused by a user's touch with a finger or the like. In any case, any touch sensor that can input the mask range on the image on the screen 28 can be used, and the method of the touch sensor 48 is not a problem.

A liquid crystal shutter plate 50 is disposed on the back side of the screen 28, sandwiching the line sensor 30 therebetween. The liquid crystal shutter plate 50 transmits or blocks the projection light incident on the screen 28 by intermittent application of voltage at each coordinate. Accordingly, the shutter plate 50 can be made transparent in an appropriate range and non-transparent in other areas by controlling the control voltage.

Next, the operation of this embodiment will be explained. First, the entire surface of the shutter plate 50 is made translucent so that the entire projected image of the film 18 is projected onto the screen 28. In this state, screen 28
The user inputs the mask area using the touch sensor 48 on the front while looking at the screen. For example, as shown in FIG. 4, the coordinates of B and C are input by touching the upper left corner B and the lower right corner C of the required range A with a finger or a special input pen. Furthermore, when masking an unnecessary portion within range A, the coordinates of the upper left and lower right corners E and F of that portion are similarly input.

These coordinates are read into the CPU 34, and the CPU 34 determines the mask range according to a control program stored in advance (FIG. 3, mask range determination means 100). The determined coordinates of the mask range are stored in the memory 42. CPU34
Based on the coordinates of this mask range, the corresponding range of the shutter plate 50 is made opaque, and this range is shielded from light (FIG. 3, liquid crystal driving means 102). As a result, the projection light in the mask range is blocked by the shutter plate 50, and only the other necessary range A appears on the screen 28.

In this state, if the line sensor 30 is moved in the sub-scanning direction and the image is read out, the image of only the necessary range A is read out (FIG. 3, image reading means 104). The CPU 34 binarizes the output of the line sensor 30 and stores it in the memory 42 . Also, if necessary, it can be stored in the optical disk device 40,
It is printed out on the printer 38 (FIG. 3, printing means 106).

In the above embodiment, the liquid crystal shutter plate 50 is used as the screen 28.
However, the present invention is not limited to this. FIG. 5 is a conceptual diagram of another embodiment. In this embodiment, a liquid crystal shutter plate 50A is arranged close to the upper surface of the film 18. In addition, a part of the image projection light is transmitted to the image sensor 30 through a semi-transparent mirror 52 and a lens 54.
The image is read here. According to this embodiment, it is possible to obtain the effect that the liquid crystal shutter plate 50A can be a small one with a small area.

(Effects of the Invention) As described above, the present invention inputs a mask range using a transparent touch sensor placed in front of the screen, blocks light from this mask range by a liquid crystal shutter plate placed in the projection optical path, and displays the mask area on the screen. Since only the other range is displayed, the mask range can be entered while checking the screen, making the operation extremely easy. Furthermore, since there are no mechanically moving parts, the mechanical configuration is extremely simple. Furthermore, an effect can be obtained in that it becomes possible to set another mask range within the effective image range in addition to a plurality of mask ranges, for example, the peripheral portion.

[Brief explanation of the drawing]

Fig. 1 is an overall view of an embodiment of the present invention, Fig. 2 is an enlarged view of its optical system, Fig. 3 is a block diagram showing its functions, and Fig. 4 is a general view of an embodiment of the present invention.
The figure shows a display image on the screen, and FIG. 5 is a conceptual diagram of another embodiment. 18... Film, 28... Screen, 48... Touch sensor, 50.5OA... Liquid crystal shutter plate. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A microfilm reader that forms an enlarged projected image of a microfilm on a transmissive screen, comprising: a translucent touch sensor disposed in front of the screen for inputting a mask range; and a translucent touch sensor extending to the screen. 1. A microfilm reader comprising a mask device comprising a liquid crystal shutter plate disposed in an optical path of projection light, the mask device blocking light from an area other than the set mask range by the liquid crystal shutter.