JP2543908Y2 - Mirror unit for film projector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror unit for guiding an enlarged projected image of a slide film set on a film projector to an image reading apparatus, and more particularly to a mirror unit for a film projector having a light shielding means for external light.

[0002]

2. Description of the Related Art In recent years, the technology of a color copying machine has been advanced, and an image recorded on a sheet can be copied with high precision. In addition, various types of image processing, such as an enlargement / reduction function, which can be performed by treating an image as a digital signal, improve the color reproducibility and increase the number of functions of a color copying machine, such as image synthesis.

For this reason, images recorded on various slide films and negative films are projected on a platen of a digital color copying machine by a film projector, and the projected image on the platen is transferred to a CCD sensor in the digital color copying machine. It has been proposed that an electrical image is obtained by photoelectrically reading by an image reading device provided with a photoelectric conversion element such as described above, and color copying is performed by the copying machine based on the image signal.

[0004] In this film projector, a mirror unit having a reflection mirror is used to change the optical path of the enlarged projection light of the slide film and the negative film and guide it to the image reading apparatus main body. As this mirror unit, for example, Japanese Utility Model Laid-Open No. 59-1687
There is one disclosed in Japanese Patent Application Publication No. 50-200.

This conventional mirror unit comprises an upper body and a lower body which are connected to each other so as to be openable and closable. A reflection mirror is mounted on the upper body and a Fresnel lens is mounted on the lower body, and the mirror unit is connected between the upper body and the lower body. The enlarged projection light output from the slide projector (film projector) is reflected by a reflection mirror, and then reflected on a platen glass of the image reading apparatus main body via a Fresnel lens. An image is formed on the upper surface.

According to this mirror unit, since it is foldable, it can be set on the main body of the image reading apparatus by a simple operation, and has the advantages that it is compact and the storage space can be reduced.

[0007]

However, in this conventional mirror unit, an opening is formed not only on the front surface between the upper body and the lower body but also on the side surface when the mirror unit is used. Therefore, not only the projection light from the film projector but also external light from a fluorescent lamp or the like enters the Fresnel lens through the side opening. As a result, there is a problem in that flare occurs in the projected image, the illuminance distribution on the Fresnel lens surface becomes non-uniform, and as a result, the image quality of the copied image obtained by the image reading apparatus main body is reduced.

As a countermeasure for blocking such external light, it is conceivable to provide a light shielding plate at a side opening between the upper part and the lower part of the main body of the mirror unit. However, simply providing a light shielding plate on a conventional mirror unit significantly impairs the advantage of the mirror unit being foldable and compact as described above.

In this mirror unit, it is necessary for the operator to move the projection lens group back and forth and focus on the Fresnel lens surface while viewing the projected image on the Fresnel lens surface through the side opening. Is provided, the operator cannot see the Fresnel lens surface, and there is a problem that it is difficult to adjust the focus and align the document.

The present invention has been made in view of such a problem, and an object of the present invention is to block external light that adversely affects image quality without impairing the conventional advantage of being foldable and compact. In addition, it is an object of the present invention to provide a mirror unit that allows an operator to easily perform operations such as focusing.

[0011]

SUMMARY OF THE INVENTION A mirror unit according to the present invention has an optical image receiving member mounting portion to which an optical image receiving member is mounted, an openable and closable mounting portion for the image receiving member mounting portion, and a reflection mirror. Reflection mirror mounting portion, which expands and contracts in accordance with the opening and closing operation of the reflection mirror mounting portion, and at least one side opening of the opening formed between the reflection mirror mounting portion and the image receiving member mounting portion. The light-shielding member includes a bellows-like light-shielding member that covers the light-shielding member, and a light-transmitting portion provided on the light-shielding member.

Specifically, as the light-shielding member, specifically, for example, a plurality of the through-holes are formed at regular intervals in a black film-like member, and the light-shielding portions and the light-transmitting portions are alternately formed. Is preferred.

With such a configuration, in the mirror unit of the present invention, since external light from a fluorescent lamp or the like is blocked by the light shielding portion of the light shielding member, the external light is placed on the surface of the internal optical image receiving member (such as a Fresnel lens). It is possible to prevent intrusion into the projected image without intrusion. Further, the operator can easily see the surface of the internal optical image receiving member through the through hole provided in the light shielding member, and the work such as focusing can be facilitated.

Further, in the mirror unit of the present invention, the through hole is formed outside the side opening formed between the optical image receiving member mounting portion and the reflecting mirror mounting portion of the bellows-shaped light shielding member. 2 of the U-shaped part that is bent toward the direction
It is preferable to provide the lower inclined surface among the two inclined surfaces. That is, since the fluorescent light, etc., which is a source of external light, is usually above the position of the operator's eyes, a through hole is formed in the lower inclined surface of the two inclined surfaces forming the V shape. By providing a portion and using the upper inclined surface as a light shielding portion, external light can be effectively blocked.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a mirror unit 1 according to an embodiment of the present invention.
Of FIG. This mirror unit 1
Includes a Fresnel lens mounting portion 2 and a reflection mirror mounting portion 3 each formed of a frame-shaped frame. One end of each of the Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3 is connected by a shaft portion 4, and the reflection mirror mounting portion 3 is opened and closed about the shaft portion 4 with respect to the Fresnel lens mounting portion 2. It is free.

The reflection mirror mounting portion 3 is provided with a reflection mirror 8 for reflecting the incident enlarged projection image to the Fresnel lens 6 side. On the other hand, an opening (not shown) is formed in the bottom surface of the Fresnel lens mounting part 2, and a diffusion plate 5 and a Fresnel lens 6 are mounted so as to close the opening. The Fresnel lens 6 and the diffusion plate 5 are formed from a single acrylic plate. The Fresnel lens 6 is formed on the surface of the acrylic plate, and the diffusion plate 5 is formed on the back surface. The Fresnel lens 6 changes the projection light, which is reflected by the reflection mirror 8 and is to be diffused, into parallel light, thereby preventing the peripheral portion of the image from being darkened. The diffusing plate 5 diffuses a very small amount of the parallel light so that a sensor in the image unit 25 described later formed by the parallel light from the Fresnel lens 6 cannot detect the parallel light. These Fresnel lens 6 and diffusion plate 5
Are fixed by the Fresnel lens mounting portion 2 by a plurality of fixing claws 7.

The Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3 are connected by two stays 9 and 10. These stays 9 and 10 maintain the angle between the reflection mirror 8 and the Fresnel lens 6 at approximately 45 ° when the space between the Fresnel lens attachment portion 2 and the reflection mirror attachment portion 3 is maximized. The upper end is rotatably supported on the side surface of the reflection mirror mounting portion 3, and the lower end is connected to a shaft 9 a movable along the stay guide 7. I have.

Both side surfaces of the opening formed between the Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3 are covered with light shielding members 12 and 13, respectively, and external light from a fluorescent lamp or the like (not shown). Is prevented from entering the Fresnel lens 6 surface. Each of the light shielding members 12 and 13 is bent and formed in a bellows shape using, for example, a black PET (polyethylene terephthalate) film, and can be expanded and contracted in accordance with opening and closing of the reflection mirror mounting portion 3.

An operator stands on one side of the light blocking member 12, and the light blocking member 12 is provided with a plurality of, for example, three through holes 14 formed by substantially rectangular openings. These through-holes 14 are for visual observation by the operator, and the operator can look through the through-holes 14 to see the projection state of the upper surface of the internal Fresnel lens 6. The other light shielding member 10 has such a through hole 1
4 is not provided, and completely covers the side opening between the Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3.

FIG. 2 is a side view showing a main part on the light shielding member 12 side, and FIG. 3 is a sectional view taken along the line AA in FIG. The light-shielding member 12 has a cross-sectional shape formed of four U-shaped portions 15 bent outward from side opening portions between the Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3, and These U-shaped parts 15
Has two upper and lower inclined surfaces 15a and 15b, respectively. The through-hole portion 14 is formed by three of these U-shaped portions 15 from above.
It is formed on each lower inclined surface 15 b of the square-shaped portion 15. That is, the light shielding member 12 has a slope 15
a through hole 1 formed on the inclined surface 15b
4 are alternately formed on the upper and lower sides.

Next, the use state of the mirror unit 1 of this embodiment will be described.

FIG. 4 shows a state in which the mirror unit 1 of this embodiment is installed on a color copying machine 22 together with the film projector 21. The mirror unit 1 is composed of a diffusion plate 5 and a Fresnel lens on the Fresnel lens mounting part 2 side. 6
Is set on the original platen glass 23. At this time, an original table glass cover 24 provided on the upper surface of the color copying machine 22 is provided on the light shielding member 13 side of the mirror unit 1.
Has been opened. A light source lamp 26 serving as a light source, a reflecting mirror 27 for reflecting light from the light source lamp 26 forward, and an aspheric lens 2 for converging light from the light source lamp 26 are provided in the film projector 21.
8. A heat ray absorption filter 29 for cutting off a light beam of a predetermined wavelength, a convex lens 30, a slide film and a negative film 31, and a projection lens group 32 are coaxially arranged.

In the mirror unit 1, the reflection mirror mounting portion 3 is opened to the maximum, and the angle between the Fresnel lens mounting portion 2 and the reflection mirror mounting portion 3 is maintained at 45 °. Therefore, the slide film and the negative film 31 projected by the light source lamp 26 of the film projector 21
Is horizontally incident from the front opening of the mirror unit 1, is reflected downward by 90 ° by the reflection mirror 8, is further condensed by the Fresnel lens 6, and then is copied on the color copier 22 side. An image is formed on the upper surface of the base glass 23. The image formed on the upper surface of the platen glass 23 is read by an image reading device 25 provided in the color copying machine 22, and then a color image is formed on a sheet by a normal copying operation.

FIG. 5 shows the light shielding state of the mirror unit 1 at this time. An operator 41 stands on the light shielding member 12 side, and an external light source, for example, a fluorescent lamp 42 is connected to the operator 4.
It is located above the first eye position 41a. Therefore, light 43 that is about to enter the interior from the fluorescent lamp 42 through one side opening between the Fresnel lens attachment portion 2 and the reflection mirror attachment portion 3 is formed on the V-shaped portion 15 of the light shielding member 12. The light is blocked by the upper inclined surface 15a (light shielding portion). Light 44 reflected by the document table glass cover 24 and entering the other side opening is completely blocked by the light blocking member 13. On the other hand, as shown by a broken line 45, the operator 31 moves the lower inclined surface 1 of the V-shaped portion 15.
The upper surface of the internal Fresnel lens 6 can be seen through the through hole 14 formed in 5b, and the focus can be adjusted by moving the projection lens group 32 back and forth while observing the projection state.

As described above, in the mirror unit 1 of the present embodiment, the light shielding members 12 and 13 can effectively prevent the intrusion of external light which adversely affects the projected image on the surface of the Fresnel lens 6, and furthermore, the operator 31 Since the inside can be visually observed through the through-hole 15, work such as focusing can be easily performed, and the image quality of the image obtained by the color copying machine 22 is improved.

Further, since the light shielding members 12 and 13 are each formed in a bellows shape and can expand and contract with the opening and closing of the reflection mirror mounting portion 3, the advantage that the conventional mirror unit is foldable and compact is impaired. Not even.

The present invention has been described with reference to the embodiments.
The present invention is not limited to the above embodiment, but can be variously changed without changing the gist of the present invention. For example, in the above-described embodiment, the through-hole portion 14 is provided on the lower inclined surface 15b of the V-shaped portion 15 of the light shielding member 12, and the upper inclined surface 1b is provided.
Although the light-shielding portion 5a is used as the light-shielding portion, the positional relationship between the light-shielding portion and the through-hole portion 14 may be changed according to the installation environment of the mirror unit 1, that is, the angle at which external light enters.

In the above embodiment, only the side surfaces of the opening formed between the reflection mirror mounting portion 3 and the Fresnel lens mounting portion 2 are covered. However, the front opening is also a light shielding member. , And a transmission portion of the enlarged projection image output from the film projector 21 may be formed on the front surface of the structure. Such a configuration can further reduce the penetration of external light. Further, in the above-described embodiment, the through holes 14 are formed only in one of the light shielding members 12, but both the light shielding members 12, 1
The holes 3 may be provided with the through holes 14 respectively. Further, the shape and size of the through-hole portion 15 and the number thereof are arbitrary, and a configuration in which a transparent film is attached to the through-hole portion 15 may be employed. Can be prevented.

In the above embodiment, the light shielding members 12, 1
3 are fixed to the reflection mirror mounting portion 3 and the Fresnel lens mounting portion 2, respectively, but they may be detachable from these, so that it can be used according to the environment of the installation location. Become.

In the above embodiment, the Fresnel lens 6 is used as the optical image receiving member.
Needless to say, ground glass and the like can also be used. Further, although the description has been given using the color copying machine 22 as the main body on which the mirror unit 1 is installed, it goes without saying that a normal black-and-white copying machine or the like may be used.

[0031]

As described above, according to the mirror unit of the first and second aspects, a bellows-like extensible light shielding member is provided between the optical image receiving member mounting portion and the reflecting mirror mounting portion. Since the light-blocking member is selectively provided with a through-hole, it is possible to substantially block external light that has an adverse effect on the internal projected image, and to allow the operator to move the surface of the internal optical image-receiving member through the through-hole. The user can easily see the image, and thus can easily perform operations such as focusing, and thus have the effect of improving the image quality of the image.

According to the mirror unit of the present invention, the through hole is provided on the lower inclined surface of the two inclined surfaces forming the V-shaped portion of the light shielding member.
In a normal installation environment where unnecessary external light enters from above the position of the operator's eyes, external light can be effectively blocked.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a mirror unit according to an embodiment of the present invention.

FIG. 2 is a side view illustrating a light-shielding member of the mirror unit of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a schematic configuration diagram for explaining a use state of the mirror unit of FIG. 1;

FIG. 5 is a configuration diagram illustrating a cross-sectional structure taken along line BB of FIG. 4, and illustrating an operation of a mirror unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mirror unit, 2 ... Fresnel lens mounting part, 3 ...
Reflection mirror mounting portion, 6: Fresnel lens, 8: Reflection mirror, 12, 13: Light shielding member, 14: Through-hole portion, 15: C-shaped portion, 15a, 15b: Inclined surface

Claims (3)

(57) [Scope of request for utility model registration] 1. An optical image receiving member mounting portion to which an optical image receiving member is mounted, a reflecting mirror mounting portion mounted to be openable and closable with respect to the image receiving member mounting portion, and a reflecting mirror mounting portion to which a reflecting mirror is mounted, and the reflecting mirror mounting. A bellows-like light-shielding member that expands and contracts in accordance with the opening and closing operation of the portion, and covers at least one side opening of the openings formed between the reflection mirror mounting portion and the image receiving member mounting portion; A mirror unit for a film projector, comprising: a light-transmitting unit provided in the mirror unit. 2. The light-shielding member is formed of a black film-like member, the plurality of through-holes are formed at regular intervals, and light-shielding portions and light-transmitting portions are alternately formed. The mirror unit for a film projector according to claim 1. 3. The light-shielding member includes a plurality of U-shaped portions bent outward from side opening portions formed between the optical image receiving member mounting portion and the reflection mirror mounting portion. The mirror unit for a film projector according to claim 2, wherein the mirror unit has a through hole formed on a lower inclined surface of the two inclined surfaces of the U-shaped portion.