JPH0522929Y2 - - 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),
It gradually becomes lower as it moves toward the outer peripheral edge of the Fresnel lens 2.

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 peripheral edge 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 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 which has a screen and movably supports the entire screen or the Fresnel lens, the transmittance of light emitted from a projector to the entire movable screen or the Fresnel lens is controlled. The transmissive projector is provided with a transmittance changing means for changing the transmittance, and the relative position of the entire screen or the Fresnel lens with respect to the main body of the transmissive projector is displayed from the position of the transmittance changing means.

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 shows a transmission type projector according to an embodiment of the present invention, in which FIG. 1A is a front view, FIG. This figure corresponds to FIG. 1b and shows a transmittance changing means according to another embodiment that can be used in a transmission type projector.

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 FIGS. 1a and 1b, the difference from the conventional transmission type projector B is that a movable screen 3, for example, has a transmittance changing means for changing the transmittance of light emitted from a projector 5. E is provided, and the relative position of the screen 3 with respect to the projector body 4 is displayed from the position of the transparency changing means E that moves with the screen 3.

In the transmittance changing means E, as shown in FIG. 1b, the light beam emitted from the projector 5 is divided into upper and lower halves at the end of the screen 3 and at a position facing the front panel 4b of the projector body 4. Light-shielding parts 11 and 12 are provided for blocking light, and a transmitting part 14 for transmitting the light rays formed between the light-shielding parts 11 and 12 is located at the center 3d of the screen 3. It corresponds to
The light shielding parts 11 and 12 are formed by applying paint or pasting tape to the upper surface of the screen 3.

The transparent portion 14 is connected to the front panel 4.
It is visible from the outside through a window 10 drilled in b.

A memory 16 is provided on the upper surface of the front panel 4b along the window 10.

Since the transmission type projector C is configured as described above, when the screen 3 is driven to move in the direction of arrow 8 or arrow 9 by a drive mechanism (not shown), the transmission part 14 also moves toward the screen 3. At the same time, it moves in the direction of arrow 8 or 9 within the frame of window 10. By associating the transparent portion 14 with the memory 16 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 determined from the position of the transparent portion 14. It can be confirmed.

Next, in the transmittance changing means F according to another embodiment shown in FIG. shaped light shielding part 13
is provided.

Therefore, the transmittance changing means E (see FIG. 1b)
Now, within the frame of the window 10 on the front panel 4b,
Although the movement of the bright part of the transparent part 14 is visible,
In the transmittance changing means F, the front panel 4b
The movement of the dark part of the light shielding part 13 is visually recognized within the frame of the window 10.

In the above embodiment, the case where the transmittance changing means E or F is provided on the screen 3 which is movably supported with respect to the projector main body 4 is explained as an example, but the transmittance changing means E or F is provided movably with respect to the projector main body 4. It is also possible to provide the Fresnel lens 2 supported by the transmittance changing means E or F.

Further, in the above embodiment, the screen 3 that is driven to move in the vertical direction is provided with the transmittance changing means E or F, but the screen 3 that is driven to move in another direction (for example, the horizontal direction) is also provided with the transmittance changing means E or F. It is also possible to provide the transmittance changing means E or F.

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, and the entire screen or the above-mentioned frame is In a transmission type projector which movably supports a Fresnel lens, a transmittance changing means for changing the transmittance of light emitted from a projector is provided on the entire movable screen or the Fresnel lens, and the transmittance changing means Since this is a transmission type projector characterized in that the relative position of the entire screen or Fresnel lens with respect to the transmission type projector body is displayed from the position of The position of the center of the screen or Fresnel lens can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 shows a transmission type projector according to an embodiment of the present invention, in which FIG. This shows a transmittance changing means according to another embodiment that can be used in a projector, and FIG. 1b, FIG. 3, and FIG. be. Explanation of symbols, 1... Lenticular lens, 2
...Fresnel lens, 2a...center, 3...
Screen, 4... Projector body, 5... Light projector, 11, 12, 13... Light shielding section, 14... Transmissive section, C... Transmissive type projector, E, F... Transmittance changing means.

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. In the projector, a transmittance changing means for changing the transmittance of the light emitted from the projector is provided on the movable entire screen or the Fresnel lens, and the transmittance changing means changes the transmittance of the entire screen or the Fresnel lens from the position of the transmittance changing means. A transmissive projector characterized in that the relative position with respect to the main body of the transmissive projector is displayed.