JPS6397928A - Image projecting device - Google Patents

Abstract

PURPOSE:To prolong the life of a lamp by providing a means which inhibits the lamp from being turned off for a time set by a timer means. CONSTITUTION:When a key on a control panel is operated, a low-level retrieval command signal is inputted to an OR gate 40 to set a flip-flop 42 and a relay driving circuit 43 operates to turn on the illumination lamp 16. At the same time, the output of the OR gate 40 is inputted to the start terminal S of a timer circuit 47 to dive a timer 47, thereby resetting a flip-flop 38. When a rewinding command key 31 is pressed, a low-level rewinding command signal is outputted to set the flip-flop 38 through an inverter 37. Its output Q goes up to a high level and enters an AND gate 39, but the T output of the timer circuit 47 is at low level before a specific time is elapsed from the illumination of the lamp, and an AND gate 39 is therefor closed, inhibiting the lamp from being turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image projection device for projecting an image onto an image support such as a microfilm.

In recent years, with the increase in the amount of information, microfills in which a large amount of information is continuously recorded have been widely used. There are various types of microfilm such as roll film and fish film, but if you want to view or copy the recorded images, you need a microfilm reader or a microfilm reader printer. is used. These include those equipped with an automatic search device that automatically searches for the desired image frame from among the many frames on the microfilm, and those that are equipped with an automatic search device that automatically searches for the desired image frame from among the many frames on the microfilm, and manual search that involves feeding the film using a motor or hand and searching while looking at the image. They are usually equipped with search means such as devices, and the microfilm is usually illuminated with an image lamp and magnified with a lens to search for the desired image frame. Illumination lamps have a limited lifespan, so it is desirable to turn them off when they are not needed.However, with conventional microfilm readers, the illumination lamp remains lit when the power switch is closed; It had the disadvantage of making it shorter.

For this reason, control has been carried out to turn on the illumination lamp only when reading the microfilm, but there is a problem in that if the illumination lamp is blinked too frequently, the life of the lamp is shortened.

In view of the above-mentioned circumstances, the present invention provides an image projection device that can shorten the lamp lighting time when unnecessary and lengthen the lamp life.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 shows a microfilm reader or reader printer with an automatic search device to which the present invention is applied.
1 is a cartridge containing microfilm;
2 is a microfilm feed motor, 3 is a gear bustan roller for feed, 4 is a feed pinch roller, 5 is a microfilm, 6 is a guide roller, 7 is a film guide, 8 is a frame mark detector, 9 is a subject mark Detector, 10 is a microfilm drive motor, 11 is a brake device, 12 is a capstan roller for film drive, 13 is a pinch roller for film drive, 14 is a microswitch for film detection, 15 is a film take-up reel, 16 is a An illumination lamp, 17 a condensing lens, and 18 a projection lens.

The microfilm stored in the cartridge L is transferred to the capstan 5 by the drive of the film feed motor 2.
, and is pulled out from the cartridge by pinch rollers 4 and sent toward take-up reel 15.

The fed film is driven by a capstan 12 and a pinch roller 13 by the film drive motor 10 in the forward direction (the direction in which it is wound onto the take-up reel), or in the reverse direction (the direction in which it is rewound into the cartridge) as necessary. ).

The frame mark detector 8 and the subject mark detector 9 each have a second
Optically detect marks m and n on the film shown in the figure,
The detection signal is sent to a search control circuit for automatic search.

The details of the automatic search using marks are well known from Japanese Patent Publication No. 41-260, etc., so the explanation thereof will be omitted. The image on the microfilm is illuminated by a lamp 16 and a condensing lens 17, and is projected onto a screen (not shown) by a projection lens for viewing.

Figure 2 shows an example of microfilm.The leading edge of the film is on the right side of the figure, and images are recorded in page order from the leading edge for each group of images with related information content.0m is for each frame of the microfilm. The frame marks provided in , and n are group marks provided at the first frame of each group of information, and each is detected by the mark detector 8.9 shown in Fig. 1. It is counted by the counting section of the search control circuit and used for automatic search.

In FIG. 2, frame At-A4. B1 to B5 each indicate information for one item (group).

FIG. 3 is an embodiment of the operation panel of the search device of the present invention,
21 is a switch to switch between frame search and item search;
22 is a numeric keypad for inputting a desired frame number or desired case number; 23 is a display for displaying the entered numerical value; 24 is a clear input key for clearing erroneous input; 25 is for clearing the entire search circuit. All clear key, 26 is a key for setting the number of prints, 27 is a preset key for presetting numerical values in the search control circuit, 28 is a start key for instructing automatic search start, 29
is a key that commands to feed one frame or one film in the reverse direction, 30 is a key that commands to feed one frame or one film in the forward direction, contrary to 29, 31
32 is a key for instructing to rewind the entire film into the cartridge, and 32 is a knob for manual retrieval, which adjusts the film feeding direction and feeding speed. If the knob 32 is turned clockwise, the film will be fed in the forward direction, and if it is turned counterclockwise, the film will be fed in the opposite direction.The larger the turning angle is, the faster the feeding speed will be. The film will stop when you align it with the indicator on the control panel.

FIG. 4 is a diagram showing the structure of the knob 32, where 33 is a cam that rotates in the same way as the knob rotates, and 34 is a cam that similarly rotates with the knob 32.
This is a variable resistor that rotates with the rotation of 2, and this change in resistance value is used to vary the film feeding speed.

Reference numeral 35 denotes a microswitch, and when the reference position a of the knob 32 and the index on the operation panel match, the actuator falls into the recess of the cam 33 and outputs a film advance stop signal and a film automatic search enable signal. .

Figure 5 shows a lighting lamp lighting circuit.

21.22.24 to 30.31.35 are the keys and switches of the aforementioned operation panel, 37 is an inverter, 39 is a Nand gate, and 40.41 is a NAND element that becomes active when a low level (Ov) signal is input. Orgate, 38.42
is a flip-flop, 43 is a relay drive circuit, 44 is a relay, 44' is a contact of relay 44, 45 is a lighting lamp transformer, 46 is a power switch, 47 is a set input (S
), the timer circuits 48, 501 to 501o are fixed resistors that output a high level signal to the terminals when a predetermined period of time has elapsed.

When the power switch 46 is turned on (closed), the flip-flop 42 is reset by the initial reset pulse R1 that is generated when the power is turned on, and enters the reset state, the output Q becomes a low level, and the relay drive circuit 43 does not operate. Therefore, the relay 44 also does not operate, and its contact 44' is off (open).
Therefore, only a preheating current determined by the fixed resistor 48 (a current that does not cause the filament of the lamp 16 to turn red) flows through the illumination lamp 16, and the lamp 16 does not turn on.

Next, when a cartridge is loaded into the microfilm reader and a key or knob 32 on the operation panel is operated to search for a desired image frame, a low-level search command signal is input to the OR gate 40, and its output is sent to the flip-flop 42.
is set, its output Q becomes high level, and the relay drive circuit 43 operates. Therefore, the relay 44 is operated, its contact 44' is closed, the illumination lamp 16 is turned on, and images can be searched and read.

At the same time, the output of the OR gate 40 enters the start terminal S of the timer circuit 47, which activates the timer 47, resets the flip-flop 38, and commands a rewind command to rewind the film into the cartridge after reading or hard copying by the printer. When the key 31 (RW) is pressed, a low-level rewind command signal is output, which passes through the inverter 37 and sets the flip-flop 38. The output Q of the flip-flop 38 becomes a high level and enters the AND gate 39. At this time, if a predetermined time has not elapsed since the lamp was turned on, the T output of the type circuit 47 is at a low level, and therefore The AND gate 39 is closed and turning off the lamp is prohibited. On the other hand, if a predetermined time has elapsed since the lamp was lit, the T output of the timer circuit 47 outputs a high level signal, the AND gate 39 is open, and the Q output of the flip-flop 38 is output. The signal is AND gate 39. It passes through the OR gate 41 and enters the reset terminal R of the flip-flop 42.
Reset.

Therefore, the relay drive circuit 43 becomes inoperative, and the relay 44
also becomes inactive. Contact 44' of relay 44 is opened;
The lamp 16 changes from the lighting state to the preheating state.

The fixed resistor 48 is used to preheat the lamp 16 and prevent rush current when the lamp is turned on. Although this method is a method of extending the life of the lamp, it is not mandatory to use it. There is no need to preheat the lamp when it is turned off. In addition, the setting time of the timer 47 depends on the supply voltage to the lamp (often used at a voltage below the rated value to extend its life), the structure of the microfilm reader, and the capacity of the heat exhaust fan built into the microfilm reader. Lighting lamp 1 depending on the temperature, preheating current, etc.
Since the usage conditions of 6 change, it is necessary to make it variable. In particular, a halogen lamp is often used for the illumination lamp 16, but in this case, the inner wall of the lamp is
If the temperature is not kept above °, the so-called halogen cycle will not operate and the original characteristics of the halogen lamp will not be exhibited.
Lifespan will also be shortened. One of the reasons why frequent flashing actually shortens the life of the lamp is thought to be that it is used in a state where the halogen cycle is not fully activated.

By doing this, you will not have to keep the lighting lamp on all the time or flash it frequently, which will shorten its life.
The present invention provides a roll film reader with an automatic search device;
Readers and reader printers that use fish film, or readers and reader printers that do not have a stand-alone format and are used as terminal devices for so-called electronic file devices (in this case, read microfilm images with COD,
It can also be applied to images that are processed and treated as binary electrical signals of 1 and 0.

Furthermore, as shown in Fig. 6, the illumination lamp lighting circuit does not use relay contacts, but instead uses SSR (Solid State).
It is also conceivable to use a non-contact system such as Relay). Here, 60 is a driver, 61 is a fixed resistor, and 62 is SS
It is R. Note that the parts not shown are the same as in FIG. 5.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a microfilm reader to which the present invention is applied, Fig. 2 is a diagram showing an example of a roll-shaped microfilm, and Fig. 3 is an operation of a microfilm reader with an automatic search device to which the present invention is applied. 4 is a block diagram of a film advance knob, FIG. 5 is a diagram showing one embodiment of the illumination lamp lighting circuit of the present invention, and FIG. 6 is a diagram showing another embodiment. 16... Illumination lamp, 22.24-30... Keys and switches of the operation panel. 31... Rewind command key, 47... Timer circuit.

Claims (1)

[Claims] comprising a timer means for controlling the lighting time of a lamp illuminating the image, and activating the timer when the lamp is turned on;
An image projection apparatus characterized by comprising means for prohibiting the lamp from being turned off during the time set by the timer means.