JPH043138A - Exposure controller of microfilm reader printer - Google Patents

Abstract

PURPOSE:To shorten the time required for printing and to allow efficient printing by reading out the data of a memory means in accordance with a print command signal and controlling an exposure. CONSTITUTION:A feed control means 102 monitors the film feed position just before a target image on approaching of this image and outputs a data taking in signal to a memory means 108 when the projecting light of a region for detecting the exposure of the target image is made incident on a line sensor 78. A memory means 108 determines the exposure from the output of the line sensor 78 based on this signal, takes in the data on the correct exposure and stores the same. Namely, this data is read out and the exposure is controlled when the print command signal is inputted and, therefore, the need for moving the line sensor after waiting for a film to stop in order to detect the exposure is eliminated. The efficiency of the printing operation is enhanced in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exposure amount control device used in a microfilm reader printer that searches for and prints a target image.

(Technical Background of the Invention) A microfilm reader printer searches for a target image, visually confirms the image on the screen, and if the image is necessary, prints it from the printer based on the input of an operator's print command signal. This allows you to output a hard copy. In order to obtain an appropriate hard copy, the appropriate exposure amount for the image must be detected prior to printing.
It is necessary to control the amount of exposure. In conventional equipment, after the operator confirms the required image on the screen,
When the print command key is pressed, the exposure amount is detected, the appropriate exposure amount is determined, and the exposure amount is controlled. At this time, it is desirable to detect the exposure amount for a predetermined area including the vicinity of the center of the image on the screen, so the exposure amount detection element (
line sensor) must be moved to this position. For this reason, there was a problem in that it took time to determine the exposure amount, which slowed down the printer's operation.

(Object of the Invention) The present invention has been made in view of the above circumstances, and provides a microfilm reader that can shorten the time required for printing and print efficiently when printing after searching for a target image. The purpose of the present invention is to provide an exposure amount control device for a printer.

(Structure of the Invention) According to the present invention, the object is to provide a microfilm reader printer that searches for and prints a target image, a film feed control means for searching for a target image, and a film feed control means for searching for a target image, and a means for controlling image projection light to be incident during image searching. a line sensor; a memory means for reading and storing data regarding the appropriate exposure amount for a target image from the line sensor while the film is moving; and after the film has stopped, data in the memory means is read out and the exposure amount is controlled based on a print command signal. This is achieved by an exposure amount control device for a microfilm reader printer, which is characterized by comprising an exposure control means that performs the following steps.

When the line sensor reads data, it is desirable to control the relative speed between the line sensor and the film to be constant. However, if this relative speed changes, it is possible to detect this relative speed and correct the output of the line sensor in accordance with the change in relative speed.

(Embodiment) Fig. 1 is an overall schematic diagram of an embodiment of the present invention, Fig. 2 is a perspective view of a part thereof, Fig. 3 is a block diagram of the main part thereof, and Fig. 4 is a flowchart of the operation. .

The roll microfilm 2 used in this embodiment is stored in a cassette 8 and loaded into the league printer device 10.

The league blink device 10 is constructed as shown in FIG. That is, the front of the case 12 (right side in Figure 1)
A transmissive screen 14 is arranged on which the image of the film 2 is enlarged and projected. Cassette 8 is screen 1
4 is loaded into the loading section 16 located below. The leading end of the film 2 wound on the reel 18 is pulled out by a loading mechanism and wound on the take-up reel 20. A light source 22 is disposed below between both reels 18, 20. The light emitted from the light source 22 passes through the film 2, and passes through the projection lens 24, the image rotation prism 26, and a plurality of reflecting mirrors 28, 30, 32. The light is guided to the screen 14 through an optical system consisting of the following. As a result, the image information recorded on one frame of the film 2 is enlarged and projected.

A mirror 34 that can move forward and backward on the optical axis is provided between the reflecting mirrors 28 and 30, and during printing, image projection light is transmitted to the printer located below by this mirror 34! 36
lead to. 38 is a masking/trimming device that blocks the incidence of a part of the projection light.

The film advance mechanism is shown in FIG. Cassette 4
is loaded into the loading section 16, the micro switch 4
0 detects this, and the loading mechanism loads film 2.
Wind the leading end of the tape around the drawer winder 20. That is, a roller (not shown) is brought into contact with the reel 18 through an opening 4a provided at the bottom of the cassette 4, and the leading end of the film 2 is pulled out and wound around the take-up reel 2o via guide rollers 42, 44. The film 2 is placed near the guide rollers 42 and 44.
Sensors 46 and 48 are provided to detect the presence or absence of.

An endless belt 50 is pressed against the take-up reel 2o and tightly contacts the film 2 being wound there. This endless belt 5o
are guide rollers 52, 54, 56 and drive rollers 58
is wrapped around. The drive roller 58 is driven by the motor 6o and causes the belt 5o to travel in the direction of arrow A, that is, in the winding direction. As a result, the film 2 is wound onto the reel 20 while being sandwiched between the belt 50 and the reel 20. The film 2 is rewound by driving the reel 18 in the direction of arrow B by the motor 62. At this time as well, the belt 50 runs together with the film 2.

A tension roller 64 is pressed against the endless belt 50 with a predetermined pressure to apply appropriate tension to the belt 50.

The rotation speed of the tension roller 64 is detected by an encoder 66. Based on the output pulse signal of the encoder 66, the traveling distance of the endless belt 50, that is, the traveling distance of the film 2 is determined.

The blip provided on the film 2 for image identification includes two sets of light emitting elements 68 (68a, 68b) and a light receiving element 7.
0 (70a, 70b). Of the light emitted from the light emitting element 68, only the light passing through the blip is selected by the slit 72 and guided to the light receiving element 70 (FIG. 2).

The output of these light-receiving elements 70 is transmitted to the CPU that constitutes the control device.
(not shown), and the image is identified by integrating the type and number of blips passed.

Behind the screen 14, the CCD line sensor 78 is held by a movable plate 80, and the movable plate 80 is movable left and right on guide rails 82 and 84. This movable plate 80 has a pair of pulleys 86.8 as shown in FIG.
Both ends of the wire 90 wound around the wire 8 are fixed.

The pulley 88 is rotated by a motor 92, and a wire 90 running therewith moves left and right on the movable plate 80.The 6-line sensor 78 detects the amount of exposure as will be described later.
In addition to being used for focus control, it also moves within the width of the screen 14 as needed to read the projected image and output the image to a printer (not shown), for example.

Next, the exposure amount control device 100 according to the present invention will be explained based on FIG. 3.4. This device 100 constitutes a part of a control device (not shown) composed of a CPU,
FIG. 3 shows only the functions necessary for the configuration of the present invention in blocks.

In FIG. 3, 102 is a film feed control means, which controls the film feed mechanism shown in FIG. That is, based on the address of the target image input from the keyboard 104, the light receiving element 70 detects blips while driving the motors 60 and 62 to move the target image onto the optical axis C (see FIG. 4). Step 200). This feed control means 102 monitors the film feed position just before the target image approaches (step 2Q2), and when the line sensor 78 receives projection light in an area for detecting the exposure amount of the target image, the feed control means 102 performs data processing. The captured signal is stored in the memory means 106.
Output to. Based on this signal, the memory means 108 calculates the exposure amount from the output of the line sensor 78, takes in data on the appropriate exposure amount, and stores it (step 204).

Note that while the line sensor 78 is reading data, if the line sensor 78 is stopped and the film feeding speed is constant, that is, if the relative speed between the two is constant, the output of the line sensor 78 can be used as is. When the relative speed between the two changes, it is necessary to correct the output of the line sensor 78 based on this relative speed. In FIG. 3, 110 is means for detecting this relative speed, and 112 is a correction means for correcting the output of the line sensor 78 based on this relative speed.

When the necessary data is read into the memory means 108 and the target image is placed on the optical axis, the film is stopped (step 2).
06), and autofocus control means (AF) 1
14, the projection lens 24 is moved on the optical axis and focused (step 208). This autofocus (AF
) The control is performed, for example, by determining the lens position where the contrast of the output of the line sensor 78 is maximized.

The operator visually checks the screen 14 to check whether the searched image needs to be printed (step 210), and if it does not need to be printed, enters the address of the next target image and starts the next search. Return (step 200).

When printing is necessary, a print command signal a is inputted using the keyboard 104 (step 212).

Based on this print command signal a, the automatic exposure control means (
AE) (116) reads data regarding the appropriate exposure amount stored in the memory means 108 and controls the illuminance of the light source 22 (step 214). and printer control means 118
flips up the mirror 34 and operates the printer 36 to print (step 218). Note that if you want to hide the edges of the image for tonoming or hide and mask unnecessary areas, use the keyboard 104 to hide these areas.
The input from the masking/trimming device 38 blocks the projection light (step 216)
.

(Effects of the Invention) As described above, the present invention reads data necessary for controlling the exposure amount of the target image using a line sensor while the film is running to search for the target image, and inputs a print command signal. At times, this data is read out to control the exposure amount, so there is no need to wait for the film to stop before moving the line sensor in order to detect the exposure amount.

Therefore, the time required from input of a print command signal to completion of printing is shortened, and the efficiency of printing work can be improved.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of one embodiment of the present invention, FIG. 2 is a perspective view of a part thereof, FIG. 3 is a block diagram of the main part, and FIG. 4 is a flowchart of the operation. 2...Micro film, 10...League printer device, 100...Exposure amount control device, 102...Film feed control means, 108...Memory means, 116...Automatic exposure control means, 118 ...Printer control means.

Claims (3)

[Claims] (1) In a microfilm reader printer that searches for and prints a target image, there is a film advance control unit that searches for the target image, a line sensor on which image projection light enters during image search, and a line sensor that It is characterized by comprising a memory means for reading and storing data regarding the appropriate exposure amount for the target image from the sensor, and an exposure control means for reading the data from the memory means and controlling the exposure amount based on a print command signal after the film has stopped. Exposure control device for microfilm reader printers. (2) The exposure amount control device for a microfilm reader printer according to claim 1, wherein the line sensor reads data regarding the target image while keeping a constant relative speed to the film. (3) A correction means for correcting data regarding the exposure amount of the target image read by the line sensor based on a relative speed difference between the line sensor and the film.
) microfilm reader printer exposure control device.