JPS609784Y2 - Microfissure projection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a microfiche projection device for enlarging and projecting microfiche for observation or printing.

Information, especially a large amount of information, is recorded at high density as minute images on microfilm to reduce the storage space, and then the minute images on the microfilm are enlarged again and displayed on a screen or enlarged and printed using a printer. Reproduction is widely practiced.

The conventional microfilm used for stamens is roll-shaped microfilm, which records information images by arranging them in a row on a roll of film, but in recent years, microfilm has been widely used to record information images on a single card-shaped photographic sheet. A so-called microfish was developed to record information images.

In this microfiche, a large number of microscopic images are photographed in a matrix in a lattice-like matrix on a sheet of film.

Compared to roll-shaped film, this microfiche has the advantage of being able to record related information in a single sheet-shaped fish, and is therefore convenient for recording and reproducing small-scale or medium-sized information unless there is a large amount of related information. .

Particularly recently, so-called COM computer output microfilming (Computer Ou
With the development of tput microfilming (tput microfilming) technology, it has become possible to accurately record information at specific positions in rows and columns on a microfiche, which has greatly increased the practicality of this microfiche.

A conventional microfiche projection device using this microfiche, as disclosed in Japanese Patent Publication No. 45-15465, for example, uses a spring action to attach a lens assembly for enlarging and projecting a microscopic image on the microfiche. A method is adopted in which the distance between the fish surface and the lens assembly is always maintained constant by pressing the fish onto a glass plate that is held by pressure.

With this configuration, once the focus is set, even if the glass plate holding the microfiche is moved back and forth or left and right to select a specific image from the microfiche for observation or printing, the selected image will not be displayed. will be projected in an enlarged manner and always in focus.

By the way, in such a projection device, the glass plate is generally arranged horizontally, so surrounding dust and dirt easily adhere to and settle on the top surface of the glass plate. The disadvantage is that the projected image is enlarged and projected onto the projection surface together with the image of

Particularly when a projection device is used in a dusty environment such as a factory, the influence of dust and the like is very large.

In addition, in projection devices where the end of the lens assembly and the glass plate are in constant contact, dust accumulates in this contact area, and the surface of the glass plate is scratched by this accumulated dust while the glass plate is being moved. As a result, this scratch is magnified and projected by the lens, which has the disadvantage that the projected image becomes difficult to see, as described above.

The present invention eliminates the above-mentioned drawbacks, automatically cleans dust, etc. on the transparent plate, and allows a clear projected image to be observed or printed at all times.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a microfiche reader to which the present invention is applied, in which a microfiche 1 is clamped and held between transparent glass plates 2 and 3.

The two glass plates 2 and 3 are held by a known fish carrier (moving table), not shown, and are configured to be movable back and forth and left and right in the horizontal direction.

Since this moving mechanism is well known, its explanation will be omitted.

A portion of the microfiche 1 is illuminated by a halogen lamp 4 and a condenser lens 5, and an image of the illuminated microfiche is enlarged and projected onto a screen 8 by a lens assembly 6 and a mirror 7.

The lens barrel 9 of the lens assembly 6 is made of plastic material, and has a flange 91 formed on its upper part, and this flange 91 is loosely fitted onto a pin 11 implanted in the reader body 10.

A spring 12 is fitted into the pin 11, and the lens barrel 9 is pressed downward by the action of the spring 12, so that the lower end surface of the lens barrel is always pressed against the upper glass plate.

The lower end surface of the lens barrel 9 is coated with a material having a small coefficient of friction in order to facilitate movement of the fish carrier.

Therefore, when the glass plates 2 and 3 are moved back and forth and left and right by the fish carrier in order to select a specific image from the microfiche 1 and position it on the optical axis of the lens assembly 6, the difference between the microfiche surface and the lens assembly The distance is always constant, and an in-focus image is always projected onto the screen.

A ring 13 having an annular shape that can be fitted into the lens barrel is arranged on the lower outer periphery of the lens barrel 9 so as to be movable in the vertical direction. A member 14 for cleaning the surface of the upper glass 2 is attached.

The cleaning member 14 is movable in the vertical direction along the circumferential surface of the lens barrel 9 integrally with the ring 13, is restricted from moving in the horizontal direction by the lens barrel 9, and is configured to be detachable from the lens barrel. There is.

The cleaning member 14 is made of a soft material such as a cloth with piles such as wool, lamb or rabbit hair.

The ring 13 supporting the cleaning member is made of a relatively heavy metal to assist the cleaning member in its action, and due to the weight of this ring 13, the cleaning member 14 is pressed against the surface of the upper glass plate 2, removing dust etc. from the surface of the glass plate. Make sure to wipe it off.

In the above device, when the two glass plates 2 and 3 are moved back and forth and left and right to position a specific piece of the microfiche on the projection optical path, the cleaning member 1 is moved by the lens barrel 9.
4 is prevented from moving in the horizontal direction, the cleaning member 14 rubs the surface of the upper glass plate 2 as the glass plate moves, and the cleaning member automatically collects dust and the like on the glass plate 2. As a result, dust and the like do not adhere to or accumulate on the contact area between the lens barrel 9 and the upper glass plate 2 or on the part of the glass plate 2 facing the lens assembly 6, preventing damage to the glass plate, and preventing the glass plate from being damaged. A clear image is always projected.

By pulling out the glass plates 2 and 3 from below the lens assembly 6 or lifting the lens barrel 9 against the spring 12, the ring 13 can be removed from the lens barrel 9, making cleaning and replacement of the cleaning member 14 extremely easy. It's easy to do.

FIG. 2 shows another embodiment of the invention, in which elements having similar functions to those in FIG. 1 are designated by the same reference numerals.

FIG. 2 shows a configuration in which a cleaning member 14 is attached and a ring 13 is pushed down by a leaf spring 20 in order to ensure cleaning by the cleaning member.

The leaf spring 20 is fixed to the main body 10 with screws.

The cleaning member 14 is pressed downward by the action of the leaf spring 20 and is constantly brought into elastic contact with the surface of the upper glass plate 2 with an appropriate pressure.
Dust and the like on the surface of the upper glass plate can be surely wiped off.

The downward pressing force of the cleaning member can be arbitrarily controlled using a leaf spring.

Note that the means for pressing the cleaning member is not limited to a leaf spring.
A coil spring or a magnet may be used, and the repulsive force of the magnet may apply a pressing action to the cleaning member.

As described above, according to the present invention, the surface of the transparent plate can be automatically cleaned during the positioning operation for selecting the image to be projected on the microfiche, so there is no need for special work to clean the transparent plate. Moreover, there is no risk of damaging the transparent plate, which is very convenient in practice, and a clear projected image can always be obtained even when used in a dusty environment.

Further, since the ring member can be easily removed by moving the lens barrel of the projection lens upward, the cleaning member can be cleaned, replaced, etc. very easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a portion of a microfiche reader showing one embodiment of the microfiche projection device of the present invention, and FIG. 2 is a sectional view showing another embodiment of the present invention. 1...Microfiche, 2,3...
・Glass plate, 6... Lens assembly, 7.
...Mirror, Death...Screen, 14...
...Cleaning parts.

Claims (3)

[Scope of utility model registration request] (1) Projection in which the selected image in the microfiche is positioned in the optical path of the projection lens by moving the carrier holding the upper and lower transparent plates that sandwich the microfiche in a direction perpendicular to the optical axis of the projection lens. In the apparatus, a ring-shaped member is loosely fitted around the outer periphery of the barrel of the projection lens, and a cleaning member is provided on the lower surface of the ring-shaped member, and while the carrier is moving, the cleaning member cleans the surface of the upper transparent plate due to its own weight, etc. A microfiche projection device characterized in that the surface of the upper transparent plate is wiped by contacting with. (2) The microfiche projection device according to claim 1, wherein the cleaning member is a brush. (3) Registration of a utility model characterized in that the lens barrel is pressed against the upper transparent plate by a spring, and the ring-shaped member is removable when the lens barrel is moved upward against the force of the spring. A microfiche projection device according to claim 1 or 2.