JPH04155323A - Reflection type overhead projector - Google Patents

Abstract

PURPOSE:To eliminate difficulty in viewing an image on a screen by installing a projection light source and a reflecting mirror which are needed to enlarge and project a translucent object to be projected in a housing, and providing a projecting lens unit on the side face of the housing. CONSTITUTION:In order to enlarge and project an image of a translucent object 20 to be projected on a screen 21, an upper cover 13 is turned upward, and the object 20 to be projected is placed on a stage glass 12. The cover 13 is then closed, and the object to be projected is held between a reflection Frenel lens 15 and the glass 12. When a switch 18 is turned on to light a projection light source 16, a light is reflected from a reflecting mirror 17 to illuminate the object to be projected. The light passing through the object to be projected is reflected from a reflecting layer 15a to be condensed by the lens 15, and reflected again from the reflecting mirror 17 to enter a projecting lens unit 19, and thus an image of the object 20 to be projected is enlarged and projected on the screen. Thus, since the light source 16 and the reflecting mirror 17 are installed in a housing 11 and the projecting lens unit 19 is installed on the side face of the housing 11, difficulty in viewing the image on the screen 21 can be eliminated.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a reflective over-herad projector.

(Prior art) In general, in a reflective over-the-radar projector, a reflective Fresnel lens with a reflective layer is placed on the top surface of the projector body, and the projection light source, reflection value, projection lens, etc. are placed above the reflective Fresnel lens via a support. It has the following configuration.

According to this configuration, the transparent projection object placed on the reflective Fresnel lens is illuminated by the projection light source, and the light transmitted through the projection object and reflected by the reflective layer is collected by the reflective Fresnel lens. The image of the object to be projected is enlarged and projected onto the screen using the projection lens and the reflection value.

(Problem to be Solved by the Invention) In the above-mentioned conventional reflection type over-height projector, a viewer seated in front of the projector body has a crotch 11 behind the projector body! When viewing the enlarged image on the screen, the viewer's view is obstructed by structures installed above the projector body, such as columns and projection light sources. It is an object of the present invention to provide a reflective overhead projector that eliminates such trouble and allows the viewer to easily view the image on the screen.

(Means for Solving Problem B) A reflective overhead projector according to the present invention includes a housing in which a steno opening provided on the upper surface is covered with a transparent plate, a reflective layer on the back side, and a front side facing the front side. A reflective Fresnel lens assembled to the housing so as to be superimposed on a transparent plate, a projection light source built into the housing, a projection lens provided on one side of the housing, and a reflection Fresnel lens built into the housing to emit light from the projection light source. The light is reflected toward a transparent projection object sandwiched between the light-transmitting plate and the reflective Fresnel lens, passes through the projection object, is reflected by the reflective layer, and is focused by the reflective Fresnel lens. and a reflecting mirror that reflects the emitted light toward the projection lens.

(Operations and Effects of the Invention) According to the above configuration, the light emitted from the projection light source is reflected by the reflecting mirror and illuminates the translucent projection object sandwiched between the transparent plate and the reflective Fresnel lens. The light transmitted through the object to be projected is reflected by the reflective layer, condensed by the reflective Fresnel lens, reflected again by the reflective mirror, and enters the projection lens. As a result, an image of the affected area is enlarged and projected onto the screen.

According to the reflective overhead blower according to the present invention, a projection light source and a reflecting mirror necessary for enlarging and projecting a translucent projection object are provided inside the housing, and a projection lens unit is provided on the side surface of the housing. Therefore, the structure above the housing that obstructs the viewer's view can be eliminated. Therefore, the troublesomeness of viewing images on the screen can be eliminated.

Furthermore, since there is no structure above the housing, the configuration is simple and extremely convenient for transportation and handling.

(Embodiment) The present invention will be described below based on the drawings. FIG. 1 shows a reflective overhead projector according to a first embodiment of the present invention. The overhead blower 10 is provided with a housing 11 having a stage dark opening [m] on the upper surface, and the open opening 11a is covered with a translucent stage glass 12.

One end of an upper cover 13 that releasably covers the stay 7 glass 12 is attached to the upper surface of the housing 11 with hinges 14 so as to be rotatable in the vertical direction.

The details of this upper cover 13 include a reflective layer 15a on the back side.
A reflective Fresnel lens 15 provided thereon is fixed with an adhesive, and by closing the upper cover 13, the front side of the Fresnel lens 15 can be superimposed on the upper surface of the stage glass 12.

A projection light source, a reflector, and a switch 18 are fixed inside the housing 11. Further, a fitting hole 11b is provided on one side of the housing 11, and a projection lens unit 19 is fitted into the fitting hole 11b.

Reflection $17 reflects the light emitted from the projection light source 16 toward a translucent projection object 20 sandwiched between the stage glass 12 and the reflective Fresnel lens 15, and transmits the light through the projection object 20 to form a reflective layer. The projection light H16 forms a required angle with respect to the stage glass 12 and the projection lens unit 19 in order to reflect the light reflected by the lens 15a and condensed by the reflection 7 lens lens X'' 15 toward the projection lens unit 19 again. It is fixed to the housing 11 as shown in FIG.

The switch 18 is for intermittent control of power supply to the projection light source 16 in conjunction with the opening/closing operation of the upper cover 13, and has an actuation piece 18m projecting upward through a through hole lie provided on the upper surface of the housing 11. have When the upper cover 13 is turned, the operating piece 18m is pushed down and the switch 18 is closed, so that the projection light source 16 is turned on. on the other hand,
When the upper cover 13 is opened, the switch 18 opens and the projection light f
116 is extinguished. Note that 21 in FIG. 1 is a screen.

Reflective overhead pronoector according to the first embodiment]
0 has the above configuration, and in order to enlarge and project the image of the transparent projection object 20 onto the screen 21, the upper cover 13 is rotated upward and the transparent projection object 20 is placed on the stage glass 12.
0 is placed, the upper cover 13 is closed, and the object 20 to be projected is held between the reflective Fresnel lens 15 and the stage glass 12. As a result, the switch 18 is closed and the projection light source 16 turns on, and the light emitted from the projection light source 16 is reflected by the reflecting mirror 17 to illuminate the firefly 20 to be projected.

The light transmitted through the projection object 20 is reflected by the reflective layer 15m and condensed by the reflective Fresnel lens 15, and is reflected @
17 and enters the projection lens unit 19, which enlarges and projects the image of the object 20 onto the screen 21.

According to the reflective over-hedra projector 10 according to this embodiment, there are advantages as listed below.

(1) The projection light source 16 and reflecting mirror 17 necessary for enlarging and projecting the translucent projection object 20 are installed inside the housing 11, and the projection lens unit 19 is installed on the side of the housing 11, so that the projection lens unit 19 is placed above the housing 11. Structures that obstruct the viewer's view can be eliminated. Therefore, the troublesomeness of viewing the image on the screen 21 can be eliminated.

(2) Since there is no structure above the housing 11, the form is simple, making it extremely convenient to transport and handle, and as shown in Figure 2, it is also easy to integrate it into a desk, table, etc. .

In the desk 30 shown in FIG. 2, the reflection type over-radiation projector 10 is mounted on the top plate 31 so that the upper cover 13 and the top plate 31 are flush with each other from the stage opening 31a inside the desk. It is embedded in the desk 30 and fixed with a bracket 32 so that an enlarged image can be projected onto the screen from the back side of the desk 30.

According to this configuration, the Overherad projector 10
When not in use, the top plate 31 can be closed by closing the top cover 13.
Since the upper cover 13 is flush, the desk 30 can be used with the over-the-top projector 10 buried.

(3) When the upper cover 13 is opened, the projection light source 16 extinguishes smoke, and when the light source 16 is lit, the upper cover 13
Since the stage opening 11a is covered by the stage opening 11m, the operator can be protected from glare caused by light leakage from the stage opening 11m.

Next, a reflection type over-radiation projector according to a second embodiment of the present invention will be explained based on FIG. 3.

The Overhead Rad projector 40 has a stake opening 41m on the top surface and a storage opening 41m on the bottom surface.
The housing 41 includes a housing 41 having a housing 41b provided therein, and a bottom cover 42 having a box structure with an open top surface and covering a storage opening 41b.

This bottom cover 42 is slidably fitted into a pair of vertically extending holes 441c fixedly attached to the housing 41, and has an id pin 42m, which is connected to the housing 41 as shown by the solid line in FIG. It is assembled so as to be movable between a use position protruding downward from the storage opening 41b and a storage position embedded in the housing 41 from the storage opening 41b as shown by the two-dot chain line in FIG. 3, and not shown. The locking mechanism allows it to be selectively locked to either of the same positions.

Further, a projection light source 16 is fixedly installed at a corner of the bottom cover 42.

On the other hand, one end of the reflecting mirror 43 is attached to the housing 41 so as to be vertically rotatable, and the free end projects into the bottom cover 42 from the storage opening 41b and comes into contact with the bottom surface of the cover 42. Therefore, when the bottom cover is moved, it rotates in conjunction with this movement between the use position shown by a solid line in FIG. 3 and the storage position shown by a two-dot chain line.

Note that the other configurations are the same as those of the first embodiment described above, so the same constituent members are given the same reference numerals and the description thereof will be omitted.

Reflection type over-rad projector 4 according to the second embodiment
0 has the above configuration, and in order to project a translucent projection object 11 m 20 with the same projector 40, the bottom cover 42 is locked in the use position by a locking mechanism (not shown), and the translucent projection object is placed on the state glass 12. 20 and close the upper cover 13. As a result, the reflector 43 is set to the use position, the switch 18 is closed, the projection light source 16 is turned on, and the light emitted from the light source 16 is transmitted to the reflector 43.
The light is reflected by and illuminates the object 20 to be projected.

The light that has passed through the projection object 20 is reflected by the reflective layer 15a, and is reflected again by the reflection layer 1143 to the projection lens unit 1.
The object to be projected 20 is projected by the same lens unit 19.
The image is enlarged and projected onto the screen.

On the other hand, when transporting the overherad projector 40, the bottom cover 42 is unlocked by the locking mechanism and the cover 42 is inserted into the housing 4 through the storage opening 41b.
1 and locked in the storage position by the locking mechanism. Along with this, the reflecting mirror 43 also rotates upward, and its free end is housed in the housing 41 as shown by the two-dot chain line in FIG.

As described above, according to this embodiment, the storage opening 41b is provided on the bottom surface of the housing 41, and when in use, the free end of the reflecting mirror 43 protrudes from the opening 41b to the outside of the housing 4.
When not in use, it can be stored inside the housing 41 together with the bottom cover 42, so it is easy to use! The OVERRAD projector 40 can be made thin and convenient to carry without being restricted by the height dimension at the use position of the t@43.

[Brief Description of the Drawings] Fig. 1 is a vertical sectional view of a reflective type over-herad projector according to a first embodiment of the present invention, Fig. 2 is a sectional view of a desk in which the over-herad projector is embedded, and Fig. 3 The figure is a longitudinal cross-sectional view of a reflective over-rad projector according to a second embodiment of the present invention. Explanation of symbols 10.40...Reflection type over rad projector,
11.41...Housing, l1m, 41+i...
Stake dose port, 12...Stage glass, 13...
・Top cover, 15... Reflective Fresnel lens, 15a
... Reflective layer, 16... Projection light source, 17.43...
Reflection layer, 19... Projection lens unit, 41b...
Storage opening, 42...bottom cover.

Claims (1)

[Claims] A housing in which a stage opening provided on the top surface is covered with a transparent plate, a reflective Fresnel lens having a reflective layer on the back side and assembled to the housing so that the front side can be overlapped with the transparent plate, and the housing. A built-in projection light source, a projection lens provided on one side of the housing, and light emitted from the projection light source built into the housing are transmitted to a transparent projection object sandwiched between the transparent plate and the reflective Fresnel lens. and a reflecting mirror that reflects light toward the projection lens, which passes through the object to be projected, is reflected by the reflective layer, and is focused by the reflective Fresnel lens, toward the projection lens. A reflective overhead projector.