JPS5826011B2 - Image observation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image observation method capable of selectively observing images of the opposite sex or the same sex as an original image.

Readers or reader printers that use microfilm etc. produce positive images (positive images) for positive films.
, for negative film, a negative image (shadow image) appears on the screen.

Generally, when observing an image projected on a screen,
It is easier to observe the image when a positive image with black lines on a white background is displayed on the screen, but normally when recording an image on film, the original image is taken on negative film, so there is no negative image on the film. image is recorded.

Therefore, in order to observe a positive image, a print with a positive image is created by reversing the negative image and this print is then observed.

This method has the disadvantage of requiring the effort of producing positive image prints from negative film.

Also, depending on the purpose of use, it may be desirable to observe the negative image, but when using two types of film: a negative film with a negative image and a positive film with a positive image,
It was not possible to arbitrarily observe images of the same or opposite sex as those recorded on film.

The present invention projects an original image while applying a voltage to a screen having an electrochromic substance, and stores the original image and positive and negative isomer images on the screen, or projects light onto the entire surface while applying a voltage to the screen. After irradiation, the original image is projected onto this screen while applying a voltage of opposite polarity to the above, and images of the positive and negative sexes of the original image are stored on the screen, thereby selectively observing images of the opposite sex or the same sex as the original image. It was made so that it could be done.

The electrochromic substance used in the present invention has the property of changing color when energized and reversibly returning to its original color (hereinafter referred to as decolorization) when energized with a polarity opposite to the aforementioned energization. A general term for substances that exhibit a phenomenon of color change depending on the temperature (hereinafter referred to as electrochromy phenomenon).

Although the mechanism that causes the electrochromy phenomenon is not necessarily single, in many cases it is considered to be a slow redox reaction between an electrolyte and a color-changing substance.

In this case, the electrolyte and the color-changing substance are not necessarily the material IC1r.
EE-separate).

The same substance can be a color-changing substance and an electrolyte at the same time.

Another view is that the change in light absorption characteristics is due to the injection of injected electrons into the color center, as in the case of photochromy, and in reality, the electrochromy phenomenon is the result of a combination of these factors. It is understood that this is occurring.

Since the electrochromy phenomenon electrically changes the inherent color of a material, the combinations of colors are diverse.

Furthermore, whether a material can transmit, reflect, or scatter light is not determined by the properties of the material itself, but rather by the method of forming the electrochromic layer. Both types have the ability to be formed.

These configurations and the above-mentioned diversity, as well as the memorability that the discolored state persists from the time it changes color until it is erased,
In addition, since it has the property of changing color depending on the applied voltage value, it can be used in a variety of applications, and has been actively researched in recent years.

Materials exhibiting electrochromic phenomena exist in a wide range of organic and inorganic substances.

Any of these materials can be used in the present invention as long as they are usually transparent.

FIGS. 1A to 1D show various structures of the projection screen of the present invention having electrochromic materials, in which 1, 1 is a transparent substrate, 2°2' is InO, S
This is a transparent electrode 3 made of nO□ or the like.

3 is a transparent or opaque optical semiconductor layer, and 4 is an electrochromic substance, for example, WO3.

It is made of a reduction metal compound such as T r 02 and is transparent.

Reference numeral 5 denotes a transparent electrolyte layer called a resistor necessary for erasing the color of the electrochromic material layer 4 that has changed color due to the electrochromic phenomenon.

3' is a transparent layer in which a photosemiconductor and an electrolyte are uniformly mixed;
4' is a transparent layer in which an electrochromic substance and an optical semiconductor are uniformly mixed.

The optical semiconductor layer 3, 3', or 4'
When using this screen P as a reflective screen, select a transparent one with an appropriate color different from the discoloration color of the electrochromic substance, and when using this screen P as a transmissive screen, select a transparent one with an appropriate color different from the discoloration color of the electrochromic substance. choose something.

In this projection screen P, the electrochromic substance layer is transparent unless a voltage is applied between the electrodes 2 and 2' and the optical semiconductor layer is not irradiated with light. When the optical semiconductor layer 3, 3', or 4' is irradiated with a light pattern while a voltage is applied, the electrochromic material layer 4, 4' corresponding to the optical semiconductor layer irradiated with the light is energized and the electrochromic material layer 4, 4' is energized. The chromie material layer changes color in response to the light pattern.

Next, when the entire surface of the photosemiconductor layer 3, 3', or 4' is uniformly irradiated with light while a voltage of opposite polarity to that described above is applied between the transparent electrodes 2, 2', the electrochromic substance is decolored. , it returns to its original transparent state.

Next, an embodiment of a film reader or reader printer to which the present invention is applied will be described with reference to FIG.

9 is the main body, 10 is the illumination light source, 11 is the condenser lens, 12 is the reflector, 13 is the original microfilm F
14 is a projection lens;
Reference numeral 5 denotes a shutter that is moved in and out of the illumination projection optical path.

16 and 17 are reflecting mirrors, 14 and 18 are full-surface exposure light sources that uniformly illuminate the entire screen 19, and 20 is a main body case 9.
This is a group of switches arranged on the operation panel.

As the screen 19 disposed on the projection surface, use is made of the projection screen P shown in FIG. It is arranged in the front opening of the main body case 9 so that the

Fig. 3 shows the control unit, 21 is a switch for specifying whether the image recorded on the original film F is a negative image or a positive image, and 22 is a switch for specifying whether the image recorded on the original film F is a negative image or a positive image. A switch 23 designates whether to observe or not, and a decoloring switch.

24 is a control circuit that selects and controls the polarity of the light projected onto the screen and the applied voltage; 25 is a full-surface exposure light source operating circuit; 26 is a circuit that applies a voltage to change the color of the electrochromic material layer between the transparent electrodes 2 and 2'; 27 is a shutter drive circuit that opens and closes the shutter 15; 28 is a first voltage supply circuit that applies a voltage of opposite polarity to the above-mentioned voltage between the transparent electrodes 2 and 2' in order to decolor the electrochromic material layer; This is a two-voltage supply circuit.

In the above apparatus, a case will be described in which a film with a negative image is used as the microfilm F, and an image of positive and negative isomerism is observed with this film.

Switch 21 is switched to negative image, and switch 22 is switched to positive image.

Then, the light source 10 lights up, and the control circuit 24 operates the first voltage supply circuit 26 to apply voltage to the screen 19 in the thread path shown by the dotted line a, and the shutter drive circuit 27 operates to close the shutter 15. The image of the film F is projected onto the screen 19.

Note that the first voltage supply circuit 26 and the shutter drive circuit 27
The order of activation does not matter.

The first voltage supply circuit 26 and the shutter drive circuit 27 become inactive after a predetermined period of time has elapsed using a timer or the like, the voltage applied to the screen is cut off, and the shutter 15 is closed.

As a result, a positive image of the original image and positive and negative images is recorded on the screen 19, and the viewer can observe the positive image on the screen.

This image is retained even if the applied voltage is removed.

Next, the case of observing images of the same sex as this film will be explained.

The switch 21 is left as it is, and the switch 22 is switched to negative image.

Then, the control circuit 24 causes the thread path shown by the solid line to
The entire surface exposure light source operating circuit 25 operates for a predetermined period of time and the light source 18
As a result, the entire surface of the screen is irradiated with light, and the first voltage supply circuit 26 is operated for a predetermined period of time to apply a voltage to the screen 19.

As a result, the entire surface of the screen 19 changes color when viewed from the viewer's side.

Note that the order in which the light source operating circuit 25 and the first voltage supply circuit 26 operate does not matter.

Thereafter, the shutter drive circuit 27 is activated by the control circuit 24 to open the shutter 15 for a predetermined period of time, and the screen 1
At the same time as the image of the film F is projected onto the screen 9, the second voltage supply circuit 28 is operated for a predetermined period of time to apply a voltage having the opposite polarity to the above-mentioned voltage to the screen 19.

Note that the order of operation of the shutter drive circuit 27 and the second voltage supply circuit 28 does not matter.

As a result, a negative image of the same sex as the original image is recorded on the screen 19, and the viewer can observe the positive image on the screen.

This image is retained even if the applied voltage is removed.

Note that when an image is stored on the screen 19, the optical semiconductor layer 3 is affected by light from the viewer side, so-called external light, but in order to prevent this, when applying a voltage between both electrodes,
The screen 19 is shielded from external light, or the transparent substrate 1 on the external light side is made of a filter that transmits light of a specific wavelength, for example, a blue filter, and the optical semiconductor is made of a material having low sensitivity to light of a specific wavelength, for example, light in the blue wavelength region. Just use it.

Alternatively, the emission wavelength of the light source may be appropriately selected, for example, a light beam of ultraviolet wavelength, and the optical semiconductor may be selected to have spectral sensitivity to this ultraviolet wavelength.

Next, when erasing the recorded image on the screen, the erasing switch 23 is switched to erasing.

Then, the control circuit 24 causes the entire surface exposure light source operating circuit 25 to operate for a predetermined period of time in the thread path shown by line C, and the entire surface of the screen is irradiated with light by the light source 18, and the second voltage supply circuit 28 operates for a predetermined period of time. A voltage is applied to the screen 19.

As a result, the stored image is erased, the screen 19 returns to its original state, and the next projection observation can be performed.

If the original image film is a positive image film, the explanation will be omitted since it can be considered in the same manner as described above.

Note that in the above embodiment, the illumination light source 10 may be blinked instead of opening and closing the shutter.

Furthermore, instead of the light source 18 that illuminates the entire screen, if the environment in which the reader is installed is bright, this external light may be used as the entire surface irradiation light.

In the above embodiment, an opaque optical semiconductor was used for the screen, but if a transparent optical semiconductor is used, it can be used as a transmission type reader.

Note that the discoloration density of the screen can be controlled by changing the operating time of each voltage supply circuit.

As described above, according to the present invention, it is possible to freely and selectively observe images of the same sex or the opposite sex as the original image, which has the effect of making it convenient to use a reader or a reader printer.

[Brief explanation of drawings]

1A to 1D are block diagrams of a projection screen used in the present invention, FIG. 2 is a block diagram of a reader or reader printer of the present invention, and FIG. 3 is a block diagram showing the control section of FIG. 2. . 10... Light source, 11... Condenser lens, 12... Reflector, 13... Film carrier, 14... Projection lens, 15
...Shutter, 16°17...Reflector, 19...Screen.

Claims (1)

[Claims] 1. The original image was projected on a screen containing an electrochromic substance while applying a voltage, and the original image and the positive and negative isomer images were stored on the screen, or the entire surface was irradiated with light while applying a voltage to the screen. After that, by projecting the original image onto this screen while applying a voltage of opposite polarity to that described above and storing images of the same sex as the original image on the screen, it is possible to selectively observe images of the opposite sex or the same sex as the original image. Image observation method.