JPH0522930Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a transmission type projector having a screen placed opposite to a projector.

Background of the invention For example, the transmission type projector A shown in Fig. 3
A screen 3 is disposed opposite the lens 5a of the projector 5, and the screen 3 is attached to the inner outer peripheral edge of the opening 4a provided in the projector body 4.

The screen 3 is formed by closely fixing a Fresnel lens 2 that collects light to a central portion 2a on the surface of a lenticular lens 1 that diffuses light.
The brightness of the image formed by the light rays emitted from is highest at the center 2a of the Fresnel lens 2 (corresponding to the center 3d of the screen 3) and shifts to the outer periphery of the Fresnel lens 2. gradually decreases as the temperature increases.

Therefore, the transmission type projector A with the above configuration
, the viewer places his or her eyes 6 on an extension of the center line connecting the center of the lens 5a of the projector 5 and the center 3d of the screen 3 (the position shown in FIG. 3). The image formed on the screen 3 can be seen in the brightest state, but the eye 6 can look at the screen 3 from the position on the above-mentioned extended line.
The image on the screen 3 gradually becomes darker as it moves toward the outer periphery of the screen.

Therefore, in recent years, for example, as shown in FIG. A transmission type projector B has been developed which has a structure in which the screen 3 can be moved.

The transmission type projector B has a plurality of guide rollers 7 rotatably attached to the projector main body 4, and both sides of the screen 3 are connected to arrows 8 and 9.
The screen 3 is supported so as to be movable in the direction, and is moved by being driven by a drive mechanism (not shown).

However, the conventional transmissive projector B configured as described above has a problem in that the viewer cannot confirm the moving direction of the screen 3 and the position of the center portion 3d with respect to the projector body 4. Ta.

Purpose of the invention The present invention was devised in view of the above circumstances, and is a transmission type projector that allows the viewer to easily check the moving direction of the screen with respect to the projector body and the position of the center of the screen. It is intended for the purpose of providing.

Structure of the invention In order to achieve the above object, the main means adopted by the invention is that it consists of a lenticular lens that diffuses light and a Fresnel lens that focuses light in the center, facing the floodlight. In a transmission type projector having a screen and movably supporting the entire screen or the Fresnel lens, a light emitting part is provided that moves to follow the entire movable screen or the Fresnel lens, This is a transmissive projector in which the relative position of the entire screen or Fresnel lens relative to the main body of the transmissive projector is displayed from the position of the light emitting part.

Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

It should be noted that the following example is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a front view of a transmission type projector according to an embodiment of the present invention, and FIGS. 2a and 2b show a light emitting section that can be used in the transmission type projector. Figure b is an exploded perspective view.

Further, the same reference numerals will be used to describe elements common to those of the conventional transmission type projector B shown in FIG.

In the transparent projector C according to this embodiment,
As shown in FIG. 1, the difference from the conventional transmission type projector B is that, for example, a movable screen 3 is provided with a light emitting section E that follows and moves.
The point is that the relative position of the screen 3 with respect to the projector main body 4 is displayed from the position of the light emitting part E.

In the light emitting section E, as shown in FIG. 2 a and b,
On the back of the front panel 4b of the projector main body 4,
Guide rail grooves 10a and 10b having a U-shaped cross section are provided facing each other.
0a and 10b are equipped with LED12 on the surface.
The LED board 11 is slidably fitted in the directions of arrows 8 and 9. A board moving lever 13 is attached to the LED board 11, and this board moving lever 13 is connected to a cutout groove 14a of a screen-side lever 14 fixed to an end of the screen 3.
has been incorporated into.

Therefore, the screen 3 is shown by the arrow 8 or 9.
When moving in the direction, the LED on the LED board 11
12 also moves in the direction of arrow 8 or 9 as the screen 3 moves.

In this case, the LED 12 corresponds to the position of the center portion 3d of the screen 3 (see FIG. 1), and is visible from the outside through the window 16 installed in the slit portion 15 of the front panel 4b. be.

A scale 17 is provided on the upper surface of the front panel 4b along the window 16.

Since the transmission type projector C is configured as described above, when the screen 3 is moved and driven in the direction of arrow 8 or 9 by a drive mechanism (not shown), the LED 12 of the light emitting section E is also moved toward the screen. 3, it moves in the direction of arrow 8 or 9 within the frame of window 16. And this
By associating the LED 12 with the scale 17 of the front panel 4b, the moving direction of the screen 3 relative to the projector body 4 and the position of the center portion 3d of the screen 3 can be easily confirmed from the position of the LED 12.

In the above embodiment, the case where the light emitting section E is provided on the screen 3 which is movably supported with respect to the projector main body 4 has been explained as an example. It is also possible to provide the Fresnel lens 2 with the light emitting section E.

Further, in the above embodiment, the light emitting section E is provided on the screen 3 that is driven to move in the vertical direction, but the light emitting section E is also provided on the screen 3 that is driven to move in another direction (for example, the horizontal direction). It is also possible to provide

Effects of the Invention As described above, the present invention has a screen that is arranged opposite to a projector and is made up of a lenticular lens that diffuses light and a Fresnel lens that focuses light in the center, In a transmission type projector that movably supports a flannel lens, a light emitting part that moves to follow the entire movable screen or the Fresnel lens is provided, and the light emitting part moves from the position of the light emitting part to the entire screen or the Fresnel lens. Since the transmissive projector is characterized in that the relative position with respect to the transmissive projector main body is displayed, the moving direction of the screen or Fresnel lens with respect to the projector main body and the position of the center of the screen or Fresnel lens can be displayed. It can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a transmissive projector according to an embodiment of the present invention, and FIGS. 2 a and 2 b show a light emitting section that can be used in the above transmissive projector, and FIG. 2 a is an assembled perspective view. FIG. 1B is an exploded perspective view, and FIGS. 3 and 4 are side sectional views of essential parts of a conventional transmission type projector, respectively. Explanation of symbols, 1... Lenticular lens, 2
...Fresnel lens, 2a...center, 3...
Screen, 4... projector body, 5... floodlight, C... transmission type projector, E... light emitting section.

Claims (1)

[Scope of utility model registration request] Transmissive type, which has a screen that is arranged opposite to the projector and is made up of a lenticular lens that diffuses light and a Fresnel lens that collects light in the center, and that the entire screen or the Fresnel lens is movably supported. The projector is provided with a light emitting section that moves following the entire movable screen or the Fresnel lens, and the relative position of the entire screen or Fresnel lens with respect to the main body of the transmission type projector is displayed from the position of the light emitting section. A transparent projector that is characterized by: