JPH03139623A - Projection type image display device - Google Patents

Abstract

PURPOSE:To automatically, easily and inexpensively obtain an image having focus which is fit for a distance to a screen by making a scanning member extending in a vertical direction to the optical axis for adjusting focus of a projecting lens abut on an inclination part provided to a second housing. CONSTITUTION:Even in the case that the projecting distances of the projecting lenses 20 - 26 are set to an optional position, the focus operation member 32 of the projecting lens is made to abut on a guide cam 40 provided on the side surface of a guide barrel which is provided to the second housing 33 when the projecting lens is housed in the second housing 33. At this time, the operation member 32 is guided to a guide groove 41 provided so that the projecting magnification of the projecting lens group is fit for the screen 34 when the member 32 is inserted by the guide cam 40. As the result, the focal distance of the projecting lens is changed and light is reflected on a second mirror 36 and a first mirror 35. Thus, the image having the focus which is fit for the distance to the screen 34 is automatically, easily and inexpensively obtained.

Description

Detailed Description of the Invention Field of the Invention The present invention relates to a projection type image display device that enlarges and projects an image projected on an image display body onto a screen using a projection lens, and particularly relates to a projection type image display device that enlarges and projects an image projected on an image display body onto a screen, and particularly relates to a projection type image display device that enlarges and projects an image projected on an image display body onto a screen. This invention relates to a joint between a housing provided with a lens and a housing provided with a screen.

2. Description of the Related Art Conventional projection type image display devices include one in which a screen is integrated into a housing including an image display body and a projection lens, and the other in which a screen is provided in a housing including an image display body and a projection lens. It is divided into two parts: and the antinomian form, which is composed separately. Here, the integrated projection type image display apparatus has the disadvantage that the apparatus itself is large in size, and once set, it is difficult to move. On the other hand, although the dinodic projection type image display device can be made smaller than the integral projection type image display device, it has the disadvantage that it is easily affected by the brightness of the environment.

Therefore, one must be selected depending on the application.

Problems to be Solved by the Invention In order to overcome the drawbacks of the one-piece and two-piece projection type image display device as described above, a two-piece projection type image display device can be housed in a housing equipped with a screen. It is possible to configure

In the recent market, the above-mentioned binocular projection type image display devices equipped with a projection lens whose projection distance is variable are becoming popular. If this binomical projection type image display device equipped with a projection lens whose projection distance is variable is constructed so that it can be stored in a housing equipped with a screen as described above, depending on the setting of the projection distance of the projection lens, the focus will be on the screen. The projected image will be out of focus and blurry.

Therefore, the present invention provides an image display device that is out of focus or blurred on the screen, even when an antinomial projection type image display device equipped with a projection lens having a variable focal length is constructed so that it can be stored in a housing equipped with a screen as described above. This solves the problem of the image being a projected image.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes at least an image display body, and a projection system that is arranged in front of the image display body and projects an image of the image display body, and furthermore, the projection distance is variable. and a second housing that is equipped with a screen set to a certain size and that allows the first housing to be housed, and the projection lens whose projection distance is variable is The second housing includes an operating member extending perpendicularly to the optical axis for distance adjustment, and the second housing has a slope at a portion that contacts the focus adjustment operating member when storing the first housing. and a means for setting the position of the operating member so that a focused projected image is obtained on the screen.

Effect: By means of the above-mentioned means, even if the projection distance of the projection lens is set to an arbitrary position, at least an image can be displayed on the second housing that is equipped with a screen and that allows the first housing to be housed. When storing a first housing including a body and a projection lens which is arranged in front of the image display body and projects an image of the image display body and whose projection distance is variable,
An operating member extending perpendicularly to the optical axis for focus adjustment of the projection lens is brought into contact with a sloped portion provided on the second wall, and at this time, the operating member is adjusted to a certain setting by the sloped portion. By being guided to the position, the projection distance of the projection lens is changed, and a focus suitable for the distance of the screen is obtained, resulting in an out-of-focus and blurred projected image on the screen. The problem is eliminated and it becomes possible to automatically, easily, and inexpensively obtain images with the appropriate focus for the screen distance.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a sectional view showing the configuration of the projector side of the binocular projection type image display device. In the figure, 1 is a light source, and the light emitted from this is sent to a total reflection mirror 3 by a reflecting umbrella 2.

Reference numeral 4 denotes a red-reflecting dichroic mirror, in which red light is sent to a total reflection mirror 5 provided above, and an image displayed on an image display device 7 via a field lens 6 is transmitted to a green-reflecting dichroic mirror. 8. Send it to the projection lens group 10 via the blue-reflecting dichroic mirror 9. In addition, the light transmitted through the red-reflecting dichroic mirror 4 is transmitted to the field lens 1 by the green-reflecting dichroic mirror 11.
The image displayed on the image display device 13 via the mirror 2 is reflected by a green-reflecting dichroic mirror 8 and sent to a projection lens 10 via a blue-reflecting dichroic mirror 9. Similarly, for blue light, the light transmitted through the green-reflecting dichroic mirror 11 is transmitted to the image display device 16 via the field lens 15.
In addition to reflecting the image appearing on the total reflection mirror 14,
It is reflected by a blue-reflecting dichroic mirror 9 and sent to a projection lens group 10.

A projection lens 20, 21, 22, 23 is attached to the first housing 17 that houses each of the components, with the optical axis 19 at the center by a fixing member 18, and is mounted on the opposite side of the first housing.
A lens support frame 27 that supports the optical axis 19 and fixes the projection lenses 24, 25, and 26 inside thereof on the light source 1 side.
A female helicoid screw 29 is screwed into a male helicoid screw 29A formed on the outside of the lens support member 28 to which the lens support member 28 is fixed.
A lens fixing member 30 having B at its tip is fixed. A focus operation ring 31 is fixed to the outer periphery of the lens support member 2.

A focus operation member 32 is fixed to the outer peripheral surface of the focus operation ring 31 so as to extend outward. By rotating the focus operation member 32 fixedly extended to the outside of the focus operation ring 31 in the circumferential direction, the lens support members 28 and 29 can be moved in the direction of the optical axis 19. At this time, the projection lenses 20, 21.
22, 23, 24, 25, and 26, the imaging position of the optical system changes.

FIG. 2 shows the structure of a second housing that is equipped with a screen and that allows the first housing 17 to be housed therein.

A screen 34 is provided on the front surface of the second housing 33, and a first mirror 35 and a second mirror 34 are provided inside the screen 34.
6 is set as shown in the figure. There is a storage section 37 behind the second mirror 36, and this storage section 37 and the second mirror 3
6, a guide tube 39 having a virtual optical axis 38 as the center is provided. A guide cam 4 is provided on the side surface of the guide tube 39.
0 is provided on the circumference, and a guide groove 41 is provided within this cam area.

FIG. 3 shows the state before the projection lens group IO is inserted into the guide tube 40, and FIG. 4 shows the state after insertion.

FIG. 1 shows a state in which the first housing body 17 is housed in the second housing body 33.

With the above configuration, the projection lenses 20, 21, 22, 2 of the projector of the binocular projection type image display device shown in FIG.
Even if the projection distance setting in 3.24.25.26 is at an arbitrary position, when storing this in the second housing 33, the focus operation member 32 of the projection lens will not be placed in the second housing 33. It is brought into contact with a guide cam 40 provided on the side surface of the guide cylinder 39 provided therein. At this time, the operating member 3
2, when the operating member 32 is inserted by this guide cam 40, it is guided to a guide groove 41 provided so that the projection magnification of the projection lens group becomes suitable for the screen 34, thereby adjusting the focal point of the projection lens. If the distance is changed, the reflected light is reflected by the second mirror 36 and the first mirror 35, and a focus suitable for the distance to the screen 34 is obtained, resulting in an out-of-focus and blurred projected image on the screen 34. There are no more problems, and screen 34
To automatically, easily, and inexpensively obtain an image with a focus suitable for the distance.

Effects of the Invention According to the present invention, even if the focal length of the projection lens of the two-body projection type image display device with a variable focal length is set at an arbitrary position, the two-body projection type image display device equipped with a screen can be stored. When storing the screen in the second housing, it is possible to obtain a focus suitable for the distance of the screen, eliminating problems such as out-of-focus and blurred projected images on the screen. To automatically, easily, and inexpensively obtain an image with a focus suitable for a distance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the projection type image display device according to the present invention, and FIG. 2 shows the configuration of a second housing that is equipped with a screen and allows the two-body projection type image display device to be housed therein. 3 is a perspective view showing the state before insertion of the guide tube and projection lens group, FIG. 4 is a perspective view showing the state after insertion, and FIG. 5 is a perspective view of the two-body projection image display device. FIG. 2 is a sectional view showing the configuration on the projector side. 1...Light source, 2...Reflector, 3,5.
14... Total reflection mirror, 4... Red reflection glaucroic mirror 7, 13.16... Image display device. 8...Green reflective guichroic mirror, 9...Blue reflective guichroic mirror, 10.
...Projection lens group, 11...Green reflective guichroic mirror, 17...First transparent body, 2
0.21゜22, 23.24.25.26...
Projection lens, 32... Focus operation member, 3
3...Second body, 34...Dan/Screen, 35...First mirror, 36...Second
Mirror 37... Storage section, 39... Guide cylinder, 40... Guide cam, 41... Guide groove.

Claims (1)

[Claims] (1) A first housing including at least an image display body, a projection lens with a variable projection distance disposed in front of the image display body, and a screen, and the first housing is made retractable. The projection lens having a variable projection distance includes an operating member extending perpendicularly to the optical axis for focus adjustment, and the second housing accommodates the first housing. In this case, the method includes means for setting the position of the operating member such that a portion that contacts the operating member for focus adjustment has a slope, and a projected image is obtained as a focused projected image on the screen. A projection type image display device characterized by: