JPS5924027Y2 - Observation device with character display - Google Patents

Description

[Detailed Description of the Invention] The present invention is an apparatus for projecting and observing an arbitrary image from among image records having a large amount of optical information onto a rear projection screen. This relates to a device that simultaneously displays numbers, symbols, etc. on a Noah projection screen.

When observing an image projected using a microfilm reader, it may be necessary to know which frame of which microfilm (or microfiche film) the image is on.

In such a case, even if the microfilm number or frame number is detected by an observation device such as a microfilm reader, the information is displayed on a character display provided separately from the observation device.

Although these character displays are generally placed in positions that are easily visible to the viewer, the user must still look away from the screen of the viewing device in order to see the characters.

As a result, the viewer becomes very tired from looking at both the screen and the character display.

An object of the present invention is to provide an observation device with a character display that does not cause fatigue.

A further object of the present invention is to provide an observation device with a character display that is spatially free of protrusions.

The present invention has a rear projection screen, and a luminescent character display for displaying information such as a number or symbol of an image record being projected onto the screen is arranged so that its display surface is close to the back side of the screen. The arranged character display is a viewing device.

A rear projection screen is a type of screen that projects an image from the side opposite to the viewer.
It is a transparent screen.

Such screens are made of glass or plastic, have a light-diffusing surface, and are sometimes colored.

Luminescent character displays are those that use light emitting diodes or Nixie tubes, etc., and in order for the characters to be always visible through the rear projection screen as constant clear characters, they must be formed by emitting light. It is desirable that the characters be on the same plane.

Next, an embodiment in which the present invention is applied to a microfiche reader will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a cross section of a microfiche reader.

In the figures, only the parts necessary to explain the present invention are shown,
Since each of these members themselves is well known, detailed explanation will be omitted.

First, the projection optical system of the microfiche reader will be explained.

A part of the light emitted from the light beam 1 is condensed by a condenser lens 2, and illuminates one frame 5 of a microfiche 4 arranged on the tip axis 3.

The image of the illuminated frame 5 is enlarged and projected onto a rear projection screen 8 via a projection lens 6 and a mirror 7 arranged along the optical axis 3.

The image projected onto the screen 8 is observed from the left side of the screen 8 in the figure.

Next, a system for displaying the number or symbol of the image recording object being projected on the character display will be explained.

Many frames are regularly arranged on the microfiche 4, and in order to place any frame among them on the optical axis 3, move the moving member 9 on which the microfiche 4 is placed relative to the optical axis. moves on a perpendicular plane.

The portion of the moving member 9 that overlaps with the microfiche 4 is transparent.

The moving member 9 may be moved manually or may be electrically controlled and driven by the control circuit 10.

Alternatively, the control circuit 10 can be manually moved by the moving member 9
It may be possible to detect the amount of movement of the object.

In any case, the amount of movement of the moving member 9 is grasped by the control circuit 10 through the conductor 11.

Therefore, the amount of movement of this moving member 9 corresponding to the position of the microfiche frame is determined by a control circuit 10 using a conductor 12.
can be displayed on the character display 13 using .

Since the method of displaying on such a character display device itself is well known, the explanation thereof will be omitted.

The character display device 13 according to the present invention is characterized in that it is disposed close to the back side of the rear projection screen 8 as shown, and that it is luminescent.

Since the character display device 13 is luminescent, it can be observed even through the screen 8, but since the screen 8 is light diffusive, if the character display device 13 is moved far away from the screen 8, the characters can be clearly seen. It cannot be observed on the screen 8.

Therefore, it is necessary to place the character display 13 close to or in close contact with the screen 8, but depending on the type of screen 8 and the size of the characters on the character display 13, the degree of proximity may be up to 5 mm. I don't mind.

FIG. 2 is an example of a front view of the screen 8 on which characters are displayed.

Projected image 14 of one frame 5 of microfiche 4
The number of microfiche 4 where this image is recorded and the frame 5 being projected on that microfiche.
Characters 15 are observed indicating the coordinate symbol indicating the position of .

The position of the characters 15 may be determined at an appropriate position on the screen 8, but it is not preferable that the characters 15 overlap with the projected image.

The information displayed on the character display 13 and observed through the screen 8 is the image record being projected onto the screen 8.
The microfiche number or symbol, etc. shown in Figure 2 is the microfiche number and two-dimensional frame coordinates, but in general, it is the number or symbol of the microfiche being projected. It is sufficient to display a number or symbol that has a one-to-one correspondence with , so when projecting an image recording material such as micro roll film or slide film, the number of the frame in the roll or the number of the slide placed ( All you have to do is display something like ``how many mortars are there?''

In that case, the number may be read out using a suitable known counting device.

Also, as a method of detecting the microfiche number as in the case of Figure 2, the microfiche storage device (
(not shown), or by attaching an appropriate notch to the microfiche.

Although the case where the present invention is used in a microfiche reader has been mainly described above, the present invention is not limited to the case where it is used in a microfiche reader.

It can be used for devices that project micro roll film readers and slide films onto rear projection screens.

According to the present invention, the character display device is not installed outside the screen, so space can be saved.

According to the present invention, characters are displayed together with images on the same screen, so there is no need to change the viewpoint significantly, and since the observation is done on the same plane, there is no sense of strangeness, so the observation device using the present invention You won't get tired even if you observe it for a long time.

Furthermore, if a light emitting diode is used in a luminescent character display, various colors can be changed.

Also, if you use negative microfilm, only the letters will appear against a black background, which is effective for design.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a microfilm reader using the present invention, and FIG. 2 is a front view of the screen of the microfilm reader using the present invention. 4... Microfilm, 8... Rear projection, 10... Control circuit, 13... Character display, 15... Displayed characters.

Claims (1)

[Scope of utility model registration request] It has a Noah projection screen, and a luminescent character display that displays information such as the number or symbol of the image recording being projected onto the screen is arranged with its display surface close to the back side of the screen. An observation device with a character display featuring the following.